by Karl Loren
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CAT SCAN
Computerized Axial Tomography
The Cat SCAN machine was invented by Hounsfield, and is basically an
xray tube that rotates in a circle around the patient making many pictures as it
rotates. The multiple xray pictures are reconstructed by a computer in axial
slice images sort of like the way a loaf of bread is sliced. Each slice of bread
can be examined separately.
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This is a typical CAT SCAN Machine - notice the hole in the middle of the gantry |
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The CAT Scan machine looks like a large DONUT standing up (called the gantry) on its side with a table going though the center of it. The patient lies on the table as the table is moved slowly into the Scanner gantry (Donut). The Gantry houses the rotating xray tube and xray receptors. The original scanners in 1978 took 2 minutes per slice and had very rough images. The new scanners today can do a series of 30 images in a few seconds and have much sharper images. |
The Scan may be done twice. First before and secondly after intravenous iodinated contrast (Same iodinated IV contrast used for IVP test see above). The iodinated contrast enhanced the vascular structures and improved interpretation of the CAT Scan images.
Possible Risks and Complications: The IV contrast is usually injected with a motor driven power injector and so extravasation from the vein which causes irritation in the skin may sometimes happen. There is also a risk of allergy to the iodinated contrast material resulting in hives, itching, wheezing, shock etc. Again pretreatment with Benadryl and Predisone usually eliminates reaction in allergic patients.
CAT SCAN showing lesions in the Spleen
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