CAT scan


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Related to CAT scan: CT scan, MRI scan

CAT scan

(kăt) [computerized axial tomography], X-rayX ray,
invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visible light. The wavelength range for X rays is from about 10−8 m to about 10−11
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 technique that allows relatively safe, painless, and rapid diagnosis in previously inaccessible areas of the body; also called CT scan. An X-ray tube, rotating around a specific area of the body, delivers an appropriate amount of X radiation for the tissue being studied and takes pictures of that part of the internal anatomy from different angles. More recent scanners have a stationary X-ray tube and use deflecting coils and special reflectors to position the X-ray beam. A computer program is then used to form a composite, readable image. CAT scanning has revolutionized medicine, especially neurology, by facilitating the diagnosis of brain and spinal cord disorders, cancercancer,
in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth.
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, and other conditions. Ultrafast CT, or electron beam CT, is able to take pictures in a tenth of a second. It is useful in creating images of moving parts, such as the heart, without blurring.

CAT scan

[′kat ‚skan]
(medicine)
An image of a sectional view of a portion of the body made by computerized tomography.

CAT scan

(Computer Axial Tomography) A series of X-rays that show the human body in slices. The X-ray mechanism, which surrounds the body, "inches" its way along the area being examined, taking multiple tomograms (slices). The computer is used to turn the tomograms into pictures. See tomography.
References in periodicals archive ?
What we needed was a CAT scan to help us identify the different density of bone and material in Bili's head.
Unlike traditional X-rays, the CAT scan X-ray beam moves around, creating many different views or "slices" of its intended subject.
It was only because I had a CAT scan that it was spotted,' he said.
In 1984 this was state-of-the-art medicine in Canada because there were at that time something like, I think, five CAT scans in the Province of Ontario.
William McCroskey, president of Innovative Imaging Systems, said the industrial CT machine differs from medical CAT scan systems in several respects: "The industrial system can utilize higher x-ray energy levels and must be able to scan objects of much greater variety in size and shape.
After simulation, treatment-planning computers are used to map out the radiation dose in and around the tumor, using information acquired by the CAT scan and other imaging studies such as PET scans and MRI.
That must be reassuring to the 697 vets who had MRIs and CAT scans at Sepulveda in the first six months of this year.
Later, a CAT scan of the patient's head revealed a right-sided temporoparietal space-occupying lesion approximately 3 cm in diameter, suggestive of a unilocular brain abscess.
All 99 children had both skull x-rays and a head CAT scan.
The idea [of quantum tomography] is to take many measurements to piece together the state, just like a CAT scan.
The plan also calls for relocating MRI and CAT scan equipment from a satellite building into the hospital.