CAT scan

scan (skan)

1. to examine or map the body, or one or more organs or regions of it, by gathering information with a sensing device.

2. the data or image so obtained.

3. shortened form of scintiscan.

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A-scan  display on a cathode ray tube of ultrasonic echoes, in which one axis represents the time required for return of the echo and the other corresponds to the strength of the echo.

B-scan  display on a cathode ray tube of ultrasonic echoes, depicting time elapsed and echo strength and producing two-dimensional cross-sectional displays by movement of the transducer.

CAT scan , CT scan computed tomography, or the image obtained from it.

M-mode scan  the image obtained using M-mode echocardiography, showing the motion (M) over time of a monodimensional (“icepick”) section of the heart.

PET scan  positron emission tomography, or the image obtained from it.

ventilation-perfusion scan , V/Q scan a scintigraphic technique for demonstrating perfusion defects in normally ventilated areas of the lung in the diagnosis of pulmonary embolism.

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CAT scan (kt)

n.

An image produced by a CAT scanner. Also called CT scan.

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CAT scan

Computer tomography, see there 

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Patient discussion about CAT scan.

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.