CAT scan

What can one do to image specific soft tissues using X-rays One must enhance the density of these regions to decrease the ability to transmit X-rays through the region. To aid in the creation of such images or CAT scans, contrast media are often ingested or injected into the body. Contrast medium fluids that are opaque (i.e., not transparent) to X-rays are known as radiopaque media. These... 

Why do CAT scans often cause a warm flush sensation See p. 128. 

Why Do CAT Scans Often Cause a Warm Flush Sensation ... 

Patients often report a warm, flushed feeling as one of the side effects of injection of a contrast medium in preparation for a CAT scan. What causes this rise in body temperature The answer lies in the ionic nature of the contrast medium and in the body s attempt to regulate the concentrations of all substances in the blood. 

Some of the ionic iodinated substances used in CAT scans include amidotrizoates (salts of diatrizoic acid) and iothalamates (salts of iothalamic acid)J l The typical cations are sodium ion or meglumine (A-methyl-Z)-glucamine) ion (Fig. 10.1.1),... 

The hardest thing for me in having a problem that has not been recognized by the medical community is to have the onus placed on the person who is not well, to almost be in a defensive position. I am someone who understands persons wanting proof, evidence, a scientific orientation. I want to say, Just hook me up to an MRI or CAT scan and expose me to perfume and watch what happens to my brain ... 

Because of early dissemination, staging of patients with small-cell lung cancer is more extensive than for patients with NSCLC. It is important to rule out distant metastasis because it will change the role of thoracic radiation in the treatment of these patients. Staging should include a complete history and physical examination, CAT scans of chest and upper abdomen to include the liver and adrenal glands, brain MRI scan, bone scan, complete blood count, and a possible bone marrow aspiration and biopsy. 

Sally snaps you from your reverie. My God, when you rotated, you looked like a CAT scan or an MRI from a hospital. The fourth dimension would make the ultimate medical diagnostic tool. She pauses. But now you look a little different. ... 

See Huber (1988b, 220) for questionable strict-Uability decisions, including one in which a jury awarded 986,000 to a woman who lost her psychic powers after a CAT scan. But Henderson and Eisenberg (1990), who examined the universe of product-liability cases from 1984 to 1987, conclude that recent tort decisions equate costs and benefits better than Huber (1988a, 1988b), Priest (1988), and Abraham (1988) claim. 

Reproduced by permission p. 283 Multi-celled human embryo 2.5 days after it was removed from the womb and stored cryogenically at the Bourn Hall Fertility Clinic, Cambridgeshire, England, photograph. AP/Wide World Photos. Reproduced by permission p. 285 CAT scan, photograph. 

For soft human tissue that would be otherwise have too low a contrast to be resolved in conventional high-intensity planar X-ray radiography, a thorough study of X-ray absorbance as a function of tissue density and thickness allowed the development of hardware and software for computed axial tomography (CAT scanning) which performs a three-dimensional analysis of X-ray absorption at low intensities and convenient two-dimensional displays of resolved human tissue features. 

Robert S. Ledley is issued the patent for diagnostic X-ray systems (CAT scans)... 

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