Blooming artifact (CT)
A head CTA with significant atherosclerotic plaque formation was selected to illustrate the article about the CT blooming artifact.
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The first image shows a thick section axial reconstruction (W: 600 L: 200) where the ICA displays significant crescentic calcified plaque buildup on both sides. The narrow window width makes it impossible to estimate the size of the true lumen of the vessels due to the blooming artifact caused by the high density plaques.
The second image is the same reconstruction but manually rewindowed (W: 1150 L: 550) to increase window width. Thus, the artifact is reduced, and the lumen can be better appreciated (note that neither images are of diagnostic quality).
Demonstration of the CT blooming artifact.