It's Aortic Disease Awareness Month-Diagnostic Testing

Hello everyone! I’m Alvaro, and welcome back to Topic Tuesday. Today we’re going to tackle a question that many patients ask about aortic disease: “🔎 How Do We See Aortic Disease?”

The aorta is the largest artery in the human body, but we cannot diagnose most aortic diseases simply by looking at the patient.

Aortic aneurysms, dissections, intramural hematomas, and other aortic conditions can develop silently, sometimes without producing any symptoms until a life-threatening complication occurs.

That is why diagnostic imaging is at the center of modern aortic care.

Today, we are going to compare the four major imaging tools used in aortic disease:

🩻 Computed Tomography (CT / CTA)

🧲 Magnetic Resonance Imaging (MRI / MRA)

🫀 Transthoracic Echocardiography (TTE)

🫀 Transesophageal Echocardiography (TEE)

Each modality has its own strengths and limitations. Some are excellent for evaluating the heart and valves; others provide detailed images of the aortic wall and branch vessels, while some can be performed rapidly at the bedside.

Understanding these differences is essential not only for diagnosing aortic disease, but also for surveillance, surgical planning, endovascular treatment, and detecting complications.

So today, let's take a closer look at these imaging modalities

🩻 CT: The Workhorse of Aortic Imaging

Computed Tomography Angiography (CTA) has become the workhorse of modern aortic imaging.

Why?

Because CT can rapidly visualize the entire aorta and its branches with excellent spatial resolution and produce detailed 3-dimensional images.

This allows physicians to evaluate:

• Aortic diameter

• Aneurysm morphology

• Aortic dissection

• Intramural hematoma

• Penetrating aortic ulcer

• Aortic rupture

• Branch-vessel involvement

• Malperfusion

• Aortic wall abnormalities

• Previous surgical or endovascular repairs

• Stent-graft position and complications

The Aortic Disease Guideline notes that the widespread availability of CT, combined with its rapid acquisition and high-resolution 3-D datasets, has led to its widespread adoption for suspected aortic pathology and periprocedural vascular evaluation.

🏆 Why Is CT Often the Gold Standard?

There is an important distinction here.

CT is not superior to every other modality for every question.

For example:

🫀 Need to evaluate the aortic valve?

→ Echocardiography may be better.

🧲 Need lifelong surveillance in a young patient and want to avoid radiation?

→ MRI may be preferable.

🚨 Suspected acute aortic syndrome?

→ CT is usually the preferred first-line imaging test when feasible.

📐 Need comprehensive anatomical mapping before surgery or TEVAR?

→ CT is exceptionally valuable.

In suspected acute aortic syndrome, CT can demonstrate the extent of dissection, identify branch-vessel involvement, detect hemopericardium or periaortic hematoma, and sometimes identify the entry tear.

🧲 What About MRI?

MRI is an excellent alternative and complementary imaging modality.

One of its greatest advantages is that it does not use ionizing radiation.

MRI can evaluate:

• The entire aorta

• Aortic diameter

• Aortic wall characteristics

• Branch vessels

• Aortic flow

• Cardiac function

  This makes MRI particularly attractive for younger patients and long-term surveillance, where repeated radiation exposure is an important consideration.

However, MRI generally takes longer, is less available, and is more difficult to perform in unstable patients.

🫀 And What About Echocardiography?

Echocardiography remains an essential part of aortic imaging.

TTE - Transthoracic echocardiography is particularly useful for:

• Aortic root

• Ascending aorta

• Aortic valve

• Left ventricular function

• Aortic regurgitation

• Pericardial effusion

It is also portable, noninvasive, and highly useful for surveillance when the relevant aortic segments are well visualized.

TEE

Transesophageal echocardiography provides high-resolution images of much of the thoracic aorta and can be particularly valuable when rapid bedside imaging is required or during surgery.

It is also extremely useful for evaluating:

• Aortic valve function

• Cardiac function

• Pericardial effusion

• Complications of acute aortic syndromes

But TEE does not provide the same comprehensive 3-D visualization of the entire aorta and its branch vessels that CTA can provide.

📊 CT vs MRI vs Echocardiography

Feature	🩻 CT / CTA	🧲 MRI / MRA	🫀 TTE	🫀 TEE
Entire aorta	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐	⭐⭐
Spatial resolution	⭐⭐⭐⭐⭐	⭐⭐	⭐⭐	⭐⭐⭐
3-D anatomy	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	⭐	⭐
Speed	⭐⭐⭐	⭐	⭐⭐	⭐⭐
Aortic arch & branches	⭐⭐⭐⭐⭐	⭐⭐⭐	⭐⭐	⭐
Aortic root	⭐⭐⭐	⭐⭐⭐	⭐	⭐⭐⭐
Valve assessment	⭐	⭐⭐	⭐⭐⭐	⭐⭐⭐
Bedside use	❌	❌	⭐⭐⭐	⭐⭐⭐
Ionizing radiation	⚠️ Yes	✅ No	✅ No	✅ No
Iodinated contrast	Usually	❌ No iodinated contrast	❌	❌
Unstable patient	⭐⭐⭐	⭐	⭐⭐⭐	⭐⭐⭐
Preoperative planning	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	⭐	⭐

ECG-gated CT/MRI can provide particularly precise assessment of the aortic root and ascending aorta.

🧠 The Big Picture

Think about aortic imaging as having different tools for different questions:

🩻 CT

“Show me the entire anatomy.”

Excellent for rapid, comprehensive anatomical assessment and treatment planning.

🧲 MRI

“Show me the aorta without radiation.”

Excellent for detailed evaluation and long-term surveillance.

🫀 TTE

“Show me the heart and proximal aorta.”

Excellent for valves, ventricular function, and the aortic root/ascending aorta.

🫀 TEE

“Show me the thoracic aorta and heart in high resolution—right now.”

Particularly useful in acute settings and during surgery.

📌 Key Takeaway

There is no single imaging test that is best for every patient. But when comprehensive anatomical evaluation of the aorta is required, CT is one of the most powerful tools available.

Its combination of:

✅ Speed

✅ High spatial resolution

✅ 3-D reconstruction

✅ Whole-aorta coverage

✅ Branch-vessel visualization

✅ Excellent detection of acute aortic pathology

has made CTA the preferred imaging modality in many patients with suspected acute aortic disease and a cornerstone of modern aortic surgery planning.

This is all we have for you today, folks!

We hope this has been informative. Join us back here for another topic during Aortic Disease Awareness Month.

✍️ Have questions about aortic imaging, cardiac imaging, or aortic surgery?

Let us know in the comments or check out our other educational posts!

ATT

ALVARO JOSE MARTINEZ SANTACRUZ

#TopicTuesday #AorticDisease #AorticImaging #CT #CTA #MRI #Echocardiography #TEE #AorticSurgery #VascularSurgery #CardiacSurgery #MedicalEducation #AorticDiseaseAwarene

Bibliography

• Isselbacher EM, Preventza O, Hamilton Black J 3rd, Augoustides JG, Beck AW, Bolen MA, et al. 2022 ACC/AHA guideline for the diagnosis and management of aortic disease: a report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines. Circulation. 2022;146(24):e334-e482. doi:10.1161/CIR.0000000000001106.

• Goldstein SA, Evangelista A, Abbara S, Arai A, Asch FM, Badano LP, et al. Multimodality imaging of diseases of the thoracic aorta in adults: from the American Society of Echocardiography and European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2015;28(2):119-182. doi:10.1016/j.echo.2014.11.015.

• Martin Czerny, Martin Grabenwöger, Tim Berger, Victor Aboyans, Alessandro Della Corte, Edward P Chen, Nimesh D Desai, Julia Dumfarth, John A Elefteriades, Christian D Etz, Karen M Kim, Maximilian Kreibich, Mario Lescan, Luca Di Marco, Andreas Martens, Carlos A Mestres, Milan Milojevic, Christoph A Nienaber, Gabriele Piffaretti, Ourania Preventza, Eduard Quintana, Bartosz Rylski, Christopher L Schlett, Florian Schoenhoff, Santi Trimarchi, Konstantinos Tsagakis, EACTS/STS Scientific Document Group , EACTS/STS Guidelines for diagnosing and treating acute and chronic syndromes of the aortic organ, European Journal of Cardio-Thoracic Surgery, Volume 65, Issue 2, February 2024, ezad426, https://doi.org/10.1093/ejcts/ezad426