CT scanning


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computed tomography

A diagnostic imaging technique in which multiple X-rays are taken from different angles in a single plane and a series of two-dimensional images (”slices”) of the different tissue densities—e.g., fat, muscle, bone, etc.—is constructed by computer. In contrast to conventional radiology, CT results in a 1000-fold increase in image resolution, and can pinpoint lesions < 2 mm in greatest dimension; dyes may be injected IV to increased resolution of abnormal tissue and blood vessels, or radiocontrast can be used for dynamic testing.

CT scanning

Computer-assisted tomography. An important method of internal X-ray scanning in which an image is built up by a computer from the data derived by analyzing and correlating the output from thousands of separate, serial, low-intensity readings, taken in successive thin planes. The radiation source is mounted on an arm that moves, between exposures, in a helix, and the radiation detector maintains a constant relationship to the source. Images can be reconstructed from the stored readings so as to appear in any desired plane or orientation. A recent development is spiral scanning that greatly speeds up the process and allows a complete chest scan within a single breath-hold. Also known as CAT scanning.

CT scanning

Computer tomography scanning is a diagnostic imaging tool that uses x rays sent through the body at different angles.
Mentioned in: Apraxia

Patient discussion about CT scanning

Q. I get bad headaches had ct scans and m.r.i. even sinus surgery, suffering 2yrs now, dizzness occurs too..

A. If all prior medical investigations turned out normal, and sinus surgery didn't help relieve your symptoms, I would suggest the reason for your headaches is probably migraine attacks, that can cause severe headaches, and no CT scan or MRI can diagnose them. The diagnosis is made clinically, by your doctor. Migraine headaches can be eased by proper medications, before and during an attack. You should consult a neurologist.

More discussions about CT scanning
References in periodicals archive ?
The enhanced measurement capabilities of CT scanning provide the information designers and engineers need to revise processes or remake molds.
In the first instance, CT scanning can serve to confirm or exclude the presence of an organic cause for the clinically identified neurological abnormality.
The next CT scanning programme in the North East area will be happening soon.
A recent study evaluated clinical presentation prior to CT scanning in patients suspected of having meningitis.
Exactly how the decision to use CT scanning was made remains unclear.
Trisch calls CT scanning "the next greatest thing." He Says, "We're working toward using it on all new projects." He cites several advantages over other metrology techniques.
Villeneuve of the National Research Council of Canada in Ottawa and his colleagues devised quantum CT scanning. It takes pictures at unprecedented speeds without immediately disrupting a molecule's electron clouds.
Considering the impendingrisk from exposure to ionizing radiations such as cancer, dedicated efforts should be made to avoid CT scanning for headache when the possibility of serious illness is low.
The results suggest that for 50-year-old men, CT scanning would accelerate diagnosis in 2 percent of individuals, but that a stunning 90.8 percent of the men would have at least one false positive in their scan.
The goal of implementing such guideline is to do CT scan only in those who are at risk of developing complications thus minimizing the cost of CT scanning as well as strain on emergency neurology and radiology departments.
Not all researchers consider CT scanning of the colon as effective as conventional colonoscopy (SN: 5/1/04, p.
CT scanning is required when complications are suspected, or in the preoperative evaluation of surgical candidates.