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Motion artifact simulating aortic dissection on CT.

M A Burns¹, P L Molina, F R Gutierrez

¹Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110.

AJR. American Journal of Roentgenology

|September 1, 1991

Summary

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A new CT scanner can create artifacts mimicking aortic dissection. This double-lumen artifact, caused by motion, appears on a few images and may lead to misdiagnosis.

Area of Science:

Radiology
Medical Imaging
Cardiovascular Imaging

Background:

Contrast-enhanced CT is crucial for diagnosing aortic dissection.
New imaging technologies require careful validation to avoid misinterpretation.

Observation:

Two patients with suspected aortic dissection showed CT findings suggestive of ascending aortic dissection.
These findings were later determined to be artifactual.
An identical artifact was found in 18% of 50 contrast-enhanced CT scans on the same new scanner.

Findings:

A specific double-lumen artifact, mimicking an intimal flap, was identified in the proximal ascending aorta.
This artifact appeared on only one or two contiguous transaxial images.
The artifact was not observed on other CT units, suggesting it is scanner-specific.

Related Experiment Videos

Implications:

This artifact can lead to misdiagnosis of aortic dissection.
Awareness of this motion-induced artifact is crucial for radiologists using this new CT technology.
Further quality control measures may be needed for rapid-acquisition CT scanners.