The three-vessel view (3VV) is one of the most essential components of the fetal echocardiography exam. As congenital heart disease remains the most common congenital anomaly, high-quality screening and consistent acquisition of standard views play a critical role in early detection. The three-vessel view provides critical insight into fetal cardiac anatomy, outflow tract alignment, mediastinal relationships, and potential abnormalities that may not be evident in the four-chamber view alone.
This article offers a clear, structured review of the 3VV—its anatomy, technique, normal sonographic appearance, and key findings that sonographers should recognize.

Understanding the Three-Vessel View
The 3VV is a transverse plane of the fetal upper mediastinum that demonstrates the relationship of the:

• Main Pulmonary Artery (MPA) / Ductus Arteriosus
• Ascending Aorta (AO)
• Superior Vena Cava (SVC)

This view is obtained superior to the outflow tract planes and is critical for evaluating the relative size, alignment, and spatial arrangement of the great vessels.

Anatomical Landmarks
A normal three-vessel view includes:
1. Main Pulmonary Artery
The largest of the three vessels in this plane, typically positioned left and anterior. It appears as the dominant vessel that transitions into the ductal arch.
2. Ascending Aorta
Centrally located and slightly smaller than the pulmonary artery. It continues superiorly to form the aortic arch.
3. Superior Vena Cava
The smallest of the three vessels, positioned to the right and posterior. It drains into the right atrium.
The vessels should appear aligned in a gentle left-to-right descending pattern, forming a smooth anatomic “step-down” in size.

Technique for Obtaining the 3VV

1. Begin in the Four-Chamber View and angle the transducer cephalad.
2. Sweep cranially, passing the left and right ventricular outflow tracts.
3. Continue advancing until you visualize the transverse alignment of the MPA, AO, and SVC.
4. Use high-resolution 2D imaging with optimization of depth, focus, and gain.
5. Apply color Doppler to evaluate flow direction, continuity, and vessel patency.
6. Adjust the scale to clearly differentiate forward flow and detect turbulence if present.

Consistency of acquisition is essential; obtaining the same window during each exam allows dependable comparison and accurate interpretation.

Normal Sonographic Appearance
In a normal 3VV:

• The MPA is the largest vessel and positioned left/anterior.
• The aorta is midline, slightly smaller than the MPA.
• The SVC is the smallest, right/posterior.
• All vessels demonstrate laminar flow on color Doppler with appropriate directionality.
• The ductus arteriosus and aortic arch can be traced anteriorly and posteriorly from this view, respectively.

The overall configuration should appear symmetric and orderly, reflecting well-aligned outflow tracts and balanced great vessel relationships.

Abnormal Findings to Recognize in the 3VV
The strength of the 3VV lies in its ability to highlight abnormalities in size, position, and alignment of the great vessels. Sonographers should be attentive to:
1. Size Discrepancy

• A small aorta may indicate left-sided obstructive lesions (e.g., coarctation, HLHS).
• A small pulmonary artery may reflect right outflow obstruction.
• A dilated vessel could suggest increased flow or post-stenotic dilation.

2. Malposition of the Great Arteries
Disruption of the normal left-to-right vessel alignment may indicate:

• Transposition of the great arteries (TGA)
• Truncus arteriosus
• Double outlet right ventricle (DORV)
• Tetralogy of Fallot variants

3. Abnormal Flow Patterns
Color Doppler findings may include:

• Turbulent flow (suggesting stenosis or obstruction)
• Reversed flow in the ductus arteriosus
• Absent or diminished flow in major vessels
• Abnormal flow convergence or crossing patterns

4. Vascular Abnormalities
The 3VV can also identify non-cardiac vascular anomalies such as:

• Persistent left superior vena cava (LSVC)
• Right aortic arch
• Aberrant vessels in the upper mediastinum

These findings can be subtle, making this view essential for comprehensive screening.

Clinical Importance of the Three-Vessel View
The 3VV is a cornerstone of fetal cardiac evaluation and is now standard in obstetric imaging guidelines. It enhances detection of conotruncal anomalies, improves screening accuracy, and provides crucial information that may influence prenatal counseling, perinatal planning, and postnatal management.
When sonographers master the acquisition and interpretation of this view, patients benefit from earlier diagnosis, more predictable outcomes, and better interprofessional coordination.

Three-Vessel Trachea View (3VT)
The three-vessel trachea view (3VTV or 3VT) is the natural extension of the 3VV as you continue sweeping cranially. While the 3VV focuses on vessel size and alignment, the 3VTV evaluates how the ductal arch and aortic arch converge toward the descending aorta and their relationship to the trachea.

This view is essential for assessing arch sidedness and detecting abnormalities of the aortic and ductal arches.

What you should see in a normal 3VTV:

• The ductal arch (from the pulmonary artery) and aortic arch forming a “V-shape”
• Both vessels converging into the descending aorta
• The trachea positioned just to the right of the arches
• Forward (antegrade) flow in both arches with color Doppler
• The pulmonary/ductal arch is typically slightly larger than the aortic arch.

Why the 3VTV matters
The 3VTV is one of the most sensitive screening planes for detecting:

• Right aortic arch
• Double aortic arch
• Vascular rings
• Coarctation (indirect indicators)
• Interrupted aortic arch
• Ductal abnormalities

It provides a quick visual assessment of:

• Arch sidedness
• Vessel convergence
• Relationship to the airway

Abnormal positioning relative to the trachea is often the first sign of a vascular ring. Combining these views helps to improve CHD detection, increase confidence in outflow tract assessment and help to identify arch anomalies early.

Final Thoughts 
The three-vessel view (3VV) and three-vessel trachea view (3VTV) are powerful screening planes that extend beyond the four-chamber and outflow tract views, providing critical insight into great vessel size, alignment, arch configuration, and their relationship to the trachea. Consistent use of both views improves early recognition of conotruncal and arch abnormalities, strengthens diagnostic confidence, and enhances overall fetal cardiac screening. By refining acquisition technique, understanding normal spatial relationships, and recognizing abnormal patterns, sonographers play a key role in earlier and more accurate detection of congenital heart disease.

If your team needs focused fetal echo training, advanced modules, or competency-based education, All About Ultrasound offers comprehensive solutions to elevate your program.

Curious about learning fetal echocardiography - our Fetal Echo Cross Training Course can get you there. We have a course option that might be just what you're looking for. Want to be sure it’s the right fit? The Fetal Echo Preview Access Pass lets you experience how we teach fetal cardiac imaging—before making a bigger investment.

👉 Try the Fetal Echo Preview Pass now or join us for upcoming Intro to Fetal Echo Hands On Training  Workshop!

Keep Scanning - 
Lara Williams, BS, ACS, RCCS, RDCS, RVT, RDMS, FASE

The right ventricular outflow tract (RVOT) view is a cornerstone of fetal cardiac screening because it shows the right ventricle connecting to the main pulmonary artery, the pulmonic valve, and often the pulmonary artery bifurcation—structures that are essential for recognizing conotruncal anomalies and outflow obstruction. ISUOG and ASE both emphasize routine assessment of outflow-tract views, including RVOT.

​Why the RVOT view matters

A clean RVOT view helps you evaluate:

• Ventriculo-arterial connection: RV → main pulmonary artery (MPA)
• Pulmonary valve: opening, thickness, restriction
• MPA size and flow
• Branch PA bifurcation (often visible as you refine/sweep)

This is one of the key views used to screen for:

• Transposition of the great arteries (TGA) (outflows not crossing normally)
• Tetralogy of Fallot (TOF) (overriding aorta/RVOT obstruction)
• Pulmonary stenosis/atresia
• Truncus arteriosus / other conotruncal defects

​​RVOT acquisition from the 4-chamber view (sweep technique)

Step-by-step (4CH → RVOT):

• Start with a true 4-chamber view - LV and RV balanced, septum crisp, apex not truncated.
• Sweep/tilt the insonation plane slightly cephalad (toward the fetal head) - This “cranial sweep” is a standard technique to move from 4CH into the outflow tracts.
• Angle slightly anterior (think: toward the fetal sternum/right shoulder depending on lie) - You’re trying to bring the pulmonary valve and main pulmonary artery into plane.
• Fine rotate just a few degrees - Small rotation helps open the RVOT without jumping straight to 3VV/3VT.
​

Confirm you’re truly in RVOT - In a good RVOT view you should see:

• The right ventricle leading into the pulmonary valve
• The main pulmonary artery arising from the RV
• The MPA coursing anteriorly and typically showing early branching (as you optimize)

​RVOT acquisition from the short-axis (SAX) view

This approach is great when your 4CH sweep keeps “missing” the outflow, or when you want a more reproducible pathway.

Step-by-step (SAX → RVOT):

• Obtain a fetal cardiac short-axis plane - In general, SAX is achieved by scanning perpendicular to the long axis of the heart.
• Move to the “high” short-axis level (great vessel level) - As you slide/tilt superiorly, you move from ventricular SAX up toward the outflow/great vessel level (where RVOT/MPA is best appreciated).
• Center the pulmonary valve and main pulmonary artery - Your target is the pulmonary valve at the RV exit and the MPA just beyond it.
• Follow the MPA until you see bifurcation - A key RVOT feature is the ability to see the MPA continue toward branching (and in nearby planes, ductal continuity).

​LPA or Ductus? That is the question...

When you’re evaluating the pulmonary artery branches in the short-axis (SAX) view, one of the most common moments of hesitation is this:

“Am I looking at the left pulmonary artery… or did I just slide into the ductus?”

It’s a fair question—and a very normal one. The key is to stop thinking of these as two identical tubes and start thinking about where they go and how they behave.

Start with anatomy and direction - From the main pulmonary artery:

The left pulmonary artery (LPA) branches laterally toward the left lung. It stays within the pulmonary circulation and does not head straight into a systemic vessel.

The ductus arteriosus courses posteriorly and inferiorly, connecting the pulmonary artery to the descending aorta. It has a longer, more continuous “run” compared to a branch PA.

If the vessel looks like it’s heading off to the lung and disappearing laterally, you’re likely following the LPA. If it looks like it’s traveling away from the heart in a smooth arc toward the descending aorta, that’s the ductus.

Use size and appearance as supporting clues

The ductus arteriosus is typically larger and more dominant than the branch pulmonary arteries in the fetus.

The LPA is smaller and more branch-like, especially earlier in gestation. Size alone isn’t diagnostic—but it helps reinforce what direction and continuity are telling you.

Sweep intentionally, not randomly

A common pitfall is overshooting the branch level.

If you’re unsure:

• Sweep slightly caudal to re-center on the main pulmonary artery
• Then slowly sweep cranially again to rediscover the branches
• Avoid large jumps that take you straight into the ductal or three-vessel views

Small, controlled movements keep you oriented.

💡 If it connects to the descending aorta, it’s the ductus. If it heads toward the lung and branches, it’s the LPA.

Once you start following the vessel’s destination—not just its shape—this distinction becomes much easier and far more intuitive.
​

What “normal RVOT” should look like (how it feels when you’re in the right place)

When you’re truly in the RVOT, things start to line up and make sense. You should see the pulmonary valve opening easily, with thin, mobile leaflets—nothing stiff, domed, or restricted. It should look like it wants to open.

The main pulmonary artery should come directly off the right ventricle and course anteriorly in front of the aorta in this plane. If it looks like it’s sneaking behind or doesn’t clearly connect to the RV, pause and reassess your angle.

And here’s the reassurance check: when you capture the LVOT as well, the aorta and pulmonary artery should cross right at their origins. That normal crossover is one of the quickest ways to confirm you’re looking at the right outflow—and not mixing up vessels.

When all three of those pieces fall into place, you can be confident you’re truly in the RVOT.

​Color Doppler: confirm patency and direction (without killing your frame rate)

Once your grayscale RVOT looks solid, color Doppler is your reality check—but this is one of those moments where less is more. Keep the color box small and focused right over the pulmonary valve and proximal main pulmonary artery. A big box might feel safer, but it will tank your frame rate and make everything harder to interpret.

Set your color scale that matches fetal flow. Typically >50cm/s is needed for RVOT flow. However when evaluating the septum, a lower velocity scale is helpful. You’re not looking for adult-level velocities here—too high and you’ll miss important flow detail.

Now confirm the essentials:

• Antegrade flow RV → MPA
• Laminar flow in a normal RVOT
• Aliasing or turbulence that could suggest stenosis or obstruction

You’re simply confirming that blood is leaving the right ventricle the way it should. And remember, outflow tract views and great vessel views with color Doppler aren’t optional. They’re a routine and expected part of fetal cardiac screening and full fetal echocardiography documentation.

Pulmonary Artery, when size really matters...
When comparing the pulmonary artery (PA) and aorta (AO) in the fetus, it’s important to remember that the PA is normally equal to or slightly larger than the aorta. This makes sense physiologically—the right ventricle is the dominant ventricle in fetal circulation, and most of the cardiac output is directed through the pulmonary artery and ductus arteriosus.

If the PA appears significantly smaller than the AO, that should raise concern for RVOT obstruction, pulmonary stenosis, or conotruncal abnormalities. On the other hand, a markedly enlarged PA relative to the aorta can suggest increased pulmonary flow or downstream obstruction. Size comparisons are never interpreted in isolation, but they provide an important visual clue when evaluating fetal outflow tracts.

​If you can demonstrate: RV → pulmonary valve → main PA (± bifurcation), you have RVOT. Then pair it with LVOT to confirm normal crossover (one of the quickest sanity checks in fetal outflow evaluation)

​Curious about learning fetal echocardiography - our Fetal Echo Cross Training Course can get you there. We have a course option that might be just what you're looking for. Want to be sure it’s the right fit? The Fetal Echo Preview Access Pass lets you experience how we teach fetal cardiac imaging—before making a bigger investment.

👉 Try the Fetal Echo Preview Pass now or join us for upcoming Intro to Fetal Echo Hands On Training  Workshop!

Keep Scanning!
- Lara Williams, BS, ACS, RCCS, RDCS, RVT, RDMS, FASE

The left ventricular outflow tract (LVOT) view is one of the most critical components of a complete fetal echocardiogram. While it may look deceptively simple, this view plays a major role in confirming normal ventriculo-arterial connections, evaluating aortic valve anatomy and flow, and screening for some of the most serious congenital heart defects.

The LVOT view answers the question “Is blood leaving the left ventricle the right way?”

Why the LVOT View Is So Important
The LVOT view allows the sonographer to:

• Confirm continuity between the left ventricle and the ascending aorta
• Visualize aortic valve opening and alignment
• Evaluate outflow tract size and direction
• Detect abnormalities such as:
  • Aortic stenosis or atresia
  • Left ventricular outflow tract obstruction
  • Malalignment defects
  • Conotruncal anomalies (when paired with RVOT assessment)

Without a clearly obtained LVOT view, major structural heart disease can be missed—even when the four-chamber view appears normal.

Where to Start: The Four-Chamber View
Every good LVOT view begins with a true four-chamber view. Before sweeping:

• Ensure the interventricular septum is well aligned
• Identify the morphologic left ventricle (smooth endocardium, mitral valve insertion)
• Confirm proper cardiac axis and apex orientation

This serves as your anchor and reference point.

How to Obtain the LVOT View
From the four-chamber view:

1. Gently sweep or tilt the transducer cranially
   This movement follows the natural course of blood exiting the left ventricle toward the head.
2. Apply subtle rotation as needed
   Slight clockwise or counterclockwise rotation helps bring the ascending aorta fully into plane.
3. Watch for ventricular elongation
   The left ventricle will lengthen as it transitions into the outflow tract.
4. Identify the aortic valve
   The mitral valve view changes as the outflow tract opens and the aortic valve becomes the dominant structure.

A correct normal LVOT view shows the left ventricle opening directly into the ascending aorta, without interruption.

What does a Diagnostic LVOT View look like?
A technically adequate, normal LVOT view includes:

• Mitral–aortic alignment, showing anatomical fibrous continuity between the anterior mitral valve leaflet and the posterior aortic root
• Continuity of the Interventricular Septum (IVS) with the anterior aortic wall
• The aortic valve centered over the left ventricle
• The ascending aorta coursing anteriorly

Using Color Doppler in the LVOT
Once grayscale anatomy is optimized, color Doppler is essential. Color helps you:

• Confirm antegrade flow from LV to aorta
• Identify any flow acceleration or turbulence 
• Screen for aortic stenosis or obstruction

Use color scale PRF settings >50 cm/s and narrow the color box to maintain frame rate and resolution.

​Common Pitfalls to Avoid
Common challenges include:

• Mistaking the RVOT for the LVOT
• Over-rotation leading directly into the three-vessel view
• Oblique imaging that creates the illusion of septal defects
• Excessive depth or sector width reducing image quality

Small adjustments make a big difference—this is a finesse view, not a forceful one.

The Big Picture
The LVOT view is more than a checkbox—this imaging view allows for physiology and alignment assessment that connects structure with flow. When mastered, it becomes one of the most satisfying views in fetal echocardiography and a powerful tool for early diagnosis. For sonographers learning fetal echo or cross-training into fetal cardiac imaging, developing confidence with the LVOT view is a major milestone. 

Curious about learning fetal echocardiography - our Fetal Echo Cross Training Course can get you there. We have a course option that might be just what you're looking for. Want to be sure it’s the right fit? The Fetal Echo Preview Access Pass lets you experience how we teach fetal cardiac imaging—before making a bigger investment.

👉 Try the Fetal Echo Preview Pass Now!

Keep Scanning!
- Lara Williams, BS, ACS, RCCS, RDCS, RVT, RDMS, FASE

Anterior abdominal wall defects are a high-yield topic in obstetric ultrasound and a common source of confusion for students and practicing sonographers alike. Two entities in particular, omphalocele and gastroschisis, are frequently tested, frequently scanned, and absolutely critical to distinguish correctly on prenatal ultrasound due to their vastly different prognostic and management implications.
While both involve herniation of abdominal contents outside the fetal body, their embryology, sonographic appearance, and associated anomalies are very different. Understanding these differences allows sonographers to recognize key features quickly, optimize imaging, and communicate findings clearly to the care team.

How to Tell the Difference Without Overthinking It

If you scan OB—or you’re studying OB—there’s a good chance you’ve mixed these two up at least once. And honestly? You’re not alone. Omphalocele and Gastroschisis both involve bowel hanging out where it shouldn’t be, both show up on exams, and both make people second-guess themselves in the scan room.

The good news: once you know what to look for first, the difference becomes pretty obvious. Let’s walk through it the way most sonographers actually think while scanning.

Omphalocele: Midline Defect with a Covering Sac
​
An omphalocele is a congenital anterior abdominal wall defect caused by failure of the midgut to return to the abdominal cavity during early embryologic development. The key distinguishing feature is that the herniated abdominal contents are contained within a membranous sac composed of amnion and peritoneum.

When you’re scanning and you see abdominal contents outside the fetus, your first question should be:
“Is there a sac?” If the answer is yes, you’re already leaning toward omphalocele.

An omphalocele happens when the midgut doesn’t return to the abdomen during early development. Instead, abdominal organs herniate into a membranous sac — and that sac is your biggest clue. Omphalocele: Midline + Covered by membrane!

What Omphalocele Usually Looks Like on Ultrasound

• Defect is midline
• Herniated organs are covered by a membrane
• The umbilical cord inserts into the defect
• Often contains liver, not just bowel

Classic Ultrasound Features

• Midline abdominal wall defect
• Herniation located at the base of the umbilical cord
• Membranous sac present covering the herniated organs
• Umbilical cord inserts into the sac
• Commonly contains liver, bowel, and other abdominal organs

Important Note! Small bowel physiologic herniation is normal up to ~11 weeks’ gestation, so be sure not to mistake it. Persistent herniation beyond that getational age raises suspicion for an omphalocele.

Clinical Significance
Omphaloceles are strongly associated with:

• Chromosomal abnormalities (Trisomy 13, 18, and 21)
• Cardiac defects
• Beckwith-Wiedemann syndrome
• Other midline anomalies

Because of this, prenatal identification of an omphalocele often prompts genetic counseling, detailed anatomic survey, and fetal echocardiography.
​

Gastroschisis: Paraumbilical Defect Without a Sac
Gastroschisis is an abdominal wall defect that results from incomplete development of the abdominal wall, typically located to the right of the umbilical cord insertion. Unlike omphalocele, there is no protective membranous sac.

So, if you see bowel just floating around in the amniotic fluid with no covering, that should immediately make you think gastroschisis.

Gastroschisis is a defect in the abdominal wall itself — most commonly to the right of the umbilical cord insertion. Gastroschisis: Right-Sided, No Sac, Free-Floating Bowel!

What Gastroschisis Typically Looks Like

• Defect is right of midline
• No membranous sac
• Bowel is free-floating in the amniotic fluid
• Umbilical cord inserts normally into the abdominal wall

Over time, you might see thickened or dilated bowel loops because that bowel is constantly exposed to amniotic fluid.
​
The Big Difference Clinically
Gastroschisis is:

• Usually isolated
• Much less likely to be associated with chromosomal abnormalities
• More about bowel health than genetics

These pregnancies are followed closely to watch bowel appearance and fetal growth, but the counseling is very different than with an omphalocele.

Classic Ultrasound Features

• Right-sided paraumbilical abdominal wall defect
• Free-floating bowel loops directly exposed to amniotic fluid
• No covering membrane
• Normal umbilical cord insertion into the abdominal wall
• Thickened, dilated, or matted bowel may be seen as gestation progresses

Clinical Significance
Gastroschisis is:

• Less commonly associated with chromosomal abnormalities
• More often isolated
• Associated with potential bowel complications such as atresia, ischemia, or necrosis

Because exposed bowel is in constant contact with amniotic fluid, ongoing ultrasound surveillance is critical to assess bowel condition and fetal growth.

Sonographer Scanning Tips 

• Always identify umbilical cord insertion when evaluating anterior wall defects.
• Assess for the presence or absence of a covering membrane.
• Sweep in multiple planes to confirm midline vs paraumbilical location.
• Document bowel appearance, thickness, dilation, and vascularity.
• Recommend fetal echocardiography when omphalocele is suspected.

Why This Distinction Matters
Accurately differentiating omphalocele from gastroschisis impacts:

• Parental counseling
• Genetic testing recommendations
• Delivery planning
• Neonatal surgical management
• Prognosis

For sonographers, recognizing the classic sonographic patterns ensures early detection, accurate reporting, and appropriate follow-up—making a real difference in patient care.

Want to Learn More?
All About Ultrasound offers advanced OB and fetal anatomy education designed to strengthen diagnostic confidence and improve real-world scanning skills. Explore our courses, live training events, and registry review programs to continue building expertise where it matters most.

- Lara Williams, BS, ACS, RCCS, RDCS, RVT, RDMS, FASE

P.S. - Don't forget to grab your FREE CME's, Complimentary Quick Guides and More!

Renal Artery Duplex imaging has a way of reminding even experienced sonographers that “straightforward on paper” doesn’t always translate to “straightforward on the table.” Between patient habitus, aortic tortuosity, respiratory motion, and those elusive renal origins, even a well-structured protocol can feel like a puzzle.
​
But with the right approach—and a few reliable habits—you can turn a challenging Renal Artery Duplex into a confident, reproducible study. Here’s a practical, clinically focused look at how to get results you can stand behind.

Start With a Strong Aortic Baseline - Before you ever chase a renal artery, you need a clean, well-measured aortic PSV. That number becomes the foundation for your renal-to-aortic ratio (RAR), and if the foundation is weak, the interpretation will be too.
​
Use B-mode to visualize the aorta clearly from proximal to distal. If you’re fighting body habitus or depth, don’t hesitate to drop your frequency to improve penetration. Rock and slide the probe to “unwrap” a tortuous aorta so your sample is aligned with true flow, and keep your Doppler angle at or below 60°.

If the aortic waveform is noisy or off-axis, pause and fix it—your entire study depends on this reference point.
​

Let Color Lead the Way - Color Doppler isn’t just for pretty imaging—it’s your roadmap. Before jumping into spectral Doppler, use color to follow the renal artery from its origin. Lower the PRF to help visualize low-flow or distal segments, and tighten the color box so your frame rate stays high.
​
Color will show you the areas you need to interrogate: turbulence, flow jets, aliasing, or areas of dampened flow. Spectral Doppler comes next—but only after you’ve mapped out the course.
​

Follow a Consistent Flow: From Origin to Intrarenal -Renal arteries can be unpredictable, but your protocol shouldn’t be. A systematic approach helps ensure nothing gets missed:

• Start at the renal origin right off the aorta.
• Follow the artery through its mid and distal segments as far as feasible.
• Finish with intrarenal (segmental/interlobar) arteries to assess indirect signs.

Document clean waveforms and PSV values at each level. Consistency makes the interpretation stronger—and it helps the reading physician trust the data you provide.
​

Angle Correction: The Quiet Deal-Breaker - Velocity criteria only work when the angle correction is sound. Renal arteries rarely sit straight, so this is where precision matters.
​
Align the Doppler cursor parallel to flow, not just the vessel walls. Stay at ≤60°. If the angle is excessive or forced, that velocity measurement is unreliable—no matter how tempting that “critical” PSV might look.
If a number seems unusually high, reassess your angle first. More Renal Artery Duplex misinterpretations come from angle error than from any other technical factor.
​

Use Intrarenal Waveforms to Support the Story - Sometimes, despite your best efforts, the main renal artery doesn’t cooperate. That doesn’t mean the exam fails. Intrarenal Doppler can reveal stenosis through indirect findings:

• Parvus-tardus waveforms
• Prolonged acceleration time
• Round, dampened systolic upstrokes
• Lower-than-expected velocities with delayed systolic peaks

These clues can strengthen your final impression and support the presence of a proximal hemodynamically significant stenosis—even when visualization is limited.
​

Optimize Patient Positioning and Reduce Artifact - Small adjustments can dramatically improve your windows:

• Ask for deep inhalation and breath hold to bring the kidney inferiorly.
• Try left or right lateral decubitus to move bowel gas off your target.
• Reduce unnecessary gain, motion artifact, or excessive color noise.

A technically clean exam saves both you and the interpreting physician a lot of second-guessing later.

Bring It All Together - A high-quality Renal Artery Duplex isn’t defined by one impressive velocity—it’s the product of consistency and correlation. Strong B-mode imaging, accurate angle correction, a reliable aortic PSV, complete renal segmentation, and intrarenal waveform assessment all work together to tell the full physiologic story.
​
With a systematic approach and careful technique, even a challenging study becomes manageable. And the more intentional your workflow, the more confident you’ll feel in your data—and in the clinical decisions it supports.

- Lara Williams, BS, ACS, RCCS, RDCS, RVT, RDMS, FASE

P.S. - Don't forget to grab your FREE CME's, Complimentary Quick Guides and More!

What is the arrow in the image referencing? You guessed it! The Stomach Position – Key to Determining Situs. Let’s talk about why.

When assessing situs in fetal echocardiography, one of the first steps is identifying the location of the fetal stomach. The stomach normally sits on the left side of the fetus (situs solitus). If it’s seen on the right, this suggests situs inversus or heterotaxy, depending on other organ positions.
By combining the stomach position with the heart apex direction and aortic/IVC arrangement, sonographers can confidently determine situs:

• Situs Solitus: Stomach and heart apex both on the left.
• Situs Inversus: Stomach and heart apex both on the right.
• Heterotaxy: Discordant or midline arrangement of abdominal and thoracic organs.

This step is fundamental because situs determination sets the framework for identifying congenital heart disease. Just like recognizing a zero Doppler shift depends on angle, situs depends on orientation landmarks—the stomach is your starting point!

Want to learn more about determining situs? Sign up for our FREE CME course and get 1 SDMS CME Credit for free!

Prevention and Solutions - While the risk is high, WRMSDs are not inevitable. Both individual sonographers and healthcare organizations can play a role in prevention.
Ergonomic Best Practices

• Adjust the patient and equipment height whenever possible.
• Position the machine close to the sonographer to reduce reaching.
• Use chairs with adjustable arm and lumbar support.
• Alternate scanning hands if possible to reduce repetitive strain.

Workplace Policies & Support

• Schedule adequate breaks between exams.
• Rotate assignments to vary physical demands.
• Provide ergonomic training for new and experienced staff.
• Invest in modern equipment designed with ergonomics in mind (lightweight transducers, height-adjustable tables).

Self-Care for Sonographers

• Incorporate stretching exercises before, during, and after shifts.
• Strengthen core and shoulder muscles to support better posture.
• Seek early intervention from occupational health professionals at the first sign of pain.

Why It Matters - Protecting sonographers from WRMSDs isn’t just about personal comfort—it’s about the long-term sustainability of the workforce. With the growing demand for imaging services, healthcare organizations cannot afford to lose skilled professionals to preventable injuries. By prioritizing ergonomics, workplace support, and self-care, we can extend careers, improve job satisfaction, and ensure that patients continue to benefit from high-quality diagnostic imaging.

Musculoskeletal disorders are the silent occupational hazard of sonography—but with awareness, prevention, and support, they don’t have to define your career. 

Now that you've read up on WRMSDs, take our FREE CME course on Sonographer Ergonomics and get 1 SDMS CME credits for free!​

For many years, sonographers have been the unseen backbone of diagnostic imaging, providing critical insights that guide patient care. But while the profession is highly rewarding, it also carries an occupational risk that is often overlooked: workplace-related musculoskeletal disorders (WRMSDs).

The Scope of the Problem - Research shows that more than 80% of sonographers will experience some form of work-related musculoskeletal pain or injury during their careers and many of these can be career-ending. These injuries most commonly affect the shoulders, neck, wrists, hands, and back, and are directly tied to the physical demands of scanning. Left untreated, WRMSDs can lead to chronic pain, reduced productivity, and even force talented professionals to leave the field prematurely.

Causes of Musculoskeletal Disorders in Sonographers - Several factors contribute to the high incidence of WRMSDs in the sonography profession:

• Repetitive Motions – Continuous scanning motions, particularly with transducer pressure, can strain muscles and tendons.
• Awkward Postures – Reaching across patients, twisting the torso, or elevating arms for prolonged periods places stress on the spine and shoulders.
• Forceful Grip – Holding the transducer tightly for stability and precision leads to wrist, hand, and forearm strain.
• Prolonged Standing or Sitting – Fixed positions reduce circulation and increase stiffness, especially in the lower back.
• High Workload & Time Pressure – Back-to-back exams often mean little opportunity for rest or stretching between patients.

Common WRMSDs in Sonography - Sonographers frequently report pain and conditions such as:

• Tendinitis and Tenosynovitis (inflammation of tendons and tendon sheaths)
• Carpal Tunnel Syndrome (compression of the median nerve in the wrist)
• Rotator Cuff Injuries (shoulder pain and weakness)
• Neck and Back Strain (resulting from poor ergonomics and posture)

Understanding Duodenal Atresia: Causes, Symptoms, and Treatment

Duodenal atresia is a rare congenital condition that affects the development of the duodenum, the first part of the small intestine. It is a congenital intestinal obstruction awhich occurs when the duodenum is either completely blocked or narrowed, leading to problems with digestion and nutrient absorption. Let's talk about the causes, symptoms, and treatment options for duodenal atresia.

Causes:
Duodenal atresia is believed to be a result of abnormal development during the early stages of fetal growth. While the exact cause is unknown, several factors may contribute to its occurrence. These include genetic abnormalities, maternal diabetes, certain genetic syndromes such as Down syndrome, and exposure to certain medications during pregnancy.

Symptoms:
Duodenal atresia typically becomes apparent soon after birth. Some common symptoms after birth include:

• Vomiting: Infants with duodenal atresia often experience vomiting, which can be bile-stained. This occurs due to the blockage preventing the passage of stomach contents into the small intestine.
• Abdominal distention: The presence of a blockage in the duodenum can cause the abdomen to become swollen and distended.
• Failure to thrive: Infants may have difficulty gaining weight and growing at a normal rate due to problems with digestion and nutrient absorption.
• Dehydration: Vomiting can lead to dehydration if fluids are not adequately replaced.

Diagnosis:
Duodenal atresia is typically diagnosed shortly after birth. However, it can be identified on prenatal ultrasound. Ultrasound findings include:

It is important to note that these ultrasound findings are suggestive of duodenal atresia, but they are not definitive. Additional diagnostic tests, such as genetic testing and fetal karyotyping, may be required for a confirmed diagnosis. Also, neonatal testing such as ultrasound and x-ray imaging can be helpful to diagnose and evaluate the severity.

Treatment:
The primary treatment for duodenal atresia is surgery. The surgical procedure involves bypassing or removing the obstructed portion of the duodenum and connecting the healthy segments. The specific surgical approach depends on the severity of the condition.

• Open surgery: In some cases, open surgery may be required to access and repair the blockage in the duodenum.
• Laparoscopic surgery: Minimally invasive laparoscopic techniques may be used for less severe cases, where smaller incisions are made, reducing the recovery time and scarring.

Following surgery, infants will require close monitoring in a neonatal intensive care unit (NICU) to ensure their digestive system functions properly. They may receive nutrition through intravenous fluids until they are able to tolerate oral feeding.

Prognosis:
With timely diagnosis and appropriate surgical intervention, the outlook for infants with duodenal atresia is generally favorable. After surgery, most infants can resume normal feeding and achieve healthy growth and development. However, it is essential for parents and caregivers to follow up with regular medical check-ups to monitor the child's progress and ensure there are no long-term complications related to the surgery. With proper treatment and ongoing medical care, children with duodenal atresia can go on to lead healthy and fulfilling lives. 

Sonography is a profession that involves hands-on patient care and often can place our bodies in difficult positions with strain on our backs, shoulders, necks, wrists and hands.

Unfortunately, sonographers are at risk of developing musculoskeletal injuries and disorders due to the nature of our work. However, there are several ways to prevent these injuries:

​What is the arrow in the image referencing?
You guessed it! Zero Doppler Shift - Let's talk about why. 

The Doppler effect or Doppler shift is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842. 

In Color ultrasound the Doppler shift works with the ultrasound system to fill in color within the vessel when there are frequency changes in relation to the observer (transducer). When the direction of the sound beam is perpendicular to the direction of flow. There is no appreciable Doppler Shift and no color filling as a result. This is due to the cosine of the angle being 90 degrees.