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Motion artifacts of the aorta simulating aortic dissection on spiral CT
S D Qanadli1, M El Hajjam, B Mesurolle
1Department of Radiology, University René Descartes-Paris V, Ambroise Paré Hospital, Boulogne, France.
Journal of Computer Assisted Tomography
|March 2, 1999
Summary
Motion artifacts in spiral CT scans of the aorta are common (57%). Using the 180 degrees linear interpolation (LI) algorithm significantly reduces these artifacts compared to the 360 degrees LI algorithm.
Area of Science:
- Radiology
- Medical Imaging
Background:
- Motion artifacts in the ascending aorta can compromise image quality on spiral CT.
- These artifacts may mimic intimal flaps or false lumens, leading to misdiagnosis.
Purpose of the Study:
- To determine the prevalence, amplitude, and extent of motion artifacts in the aorta using spiral CT.
- To investigate the impact of acquisition and reconstruction parameters on these artifacts.
Main Methods:
- Retrospective analysis of 171 thoracic spiral CT scans.
- Two reviewers assessed the presence, location, amplitude, and extent of ascending aorta artifacts.
Main Results:
- Aortic motion artifacts were present in 57% of spiral CT examinations.
- Mean artifact amplitude was 4±4 mm and mean extent was 6±7 mm.
- Artifacts were significantly more pronounced with the 360 degrees linear interpolation (LI) algorithm than the 180 degrees LI algorithm.
Conclusions:
- The prevalence of motion artifacts on spiral CT is higher than previously reported for incremental CT.
- Employing the 180 degrees LI algorithm substantially reduces the prevalence of these artifacts.