n CME : Your SA Journal of CPD - Multidetector computed tomography of the abdomen : main article




The development of multidetector CT (MDCT) imaging has not only further improved diagnostic CT imaging, but has also expanded the role of CT, including CT angiography and CT colonography. <BR>MDCT involves spiral / helical scanning, replacing the single CT detector with up to 64 detectors, and the use of massive computing power for image reconstruction. <BR>Up to 64 image slices through the subject are obtained in a single 360o rotation of the X-ray tube. <BR>Atherosclerotic complications of the abdominal aorta such as aneurysms, occlusions, ulceration and dissection can be exquisitely imaged using MDCT angiography, largely replacing diagnostic catheter angiography. <BR>Accurate imaging in the hepatic arterial and portal venous phases is the major advantage of MDCT in terms of liver imaging. <BR>Subtle hyper-enhancing lesions, such as small hepatocellular carcinomas and highly vascular metastases, can be detected earlier and more accurately with improved enhancement and multiplanar imaging. <BR>Hepatic trauma can be accurately and rapidly assessed with MDCT. <BR>Multiplanar and 3-D techniques with MDCT are ideally suited to imaging of the pancreas owing to its orientation and position in the retroperitoneum. <BR>Spiral CT is well established in the evaluation of renal calculi. MDCT further improves on the accuracy of spiral CT in detecting the presence and location of calculi. <BR>MDCT colonography is a relatively new technique requiring bowel preparation and colonic gas insufflation with administration of a muscle relaxant (commonly hyoscine butylbromide). <BR>Applications of MDCT for the small bowel include Crohn's disease, small-bowel tumours, obstruction and ischaemia.


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