Automatic Exposure Control in CT: Applications and Limitations
[Show abstract] [Hide abstract] ABSTRACT: CT colonography (CTC) is a validated colorectal cancer test that provides an additional minimally-invasive screening option which is likely to be preferred by some patients. Important examination prerequisites include adequate colonic cleansing and distention. Tagging of residual material aids in the differentiation of true polyps from stool. Low radiation dose technique should be employed routinely for screening studies. Readers must be skilled in the use of both 2D and 3D interpretation methods.0Comments 12Citations
- "Automatic exposure control (AEC) continuously adjusts the tube current according to the patient's volume and can significantly reduce radiation exposure particularly in thin patients. Radiation exposure may be decreased by as much as 20 to 35% for abdominal CT scans using AEC. Another technique that has been used to decrease radiation dose is iterative reconstruction which is employed in combination with traditional filtered back projection (FBP) to post-process CT data. "
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