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Searchterm 'ROM' found in 9 terms [
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Fluoroscopic System
When invented, a fluoroscopic system consisted of x-ray tube, fluorescent screen and x-ray table. In 1950's, the development of the image intensifier revolutionized fluoroscopes. The basic components are extended by a gantry, image intensifier, camera, film and monitor system. The x-ray tube is usually located under the patient table, in opposition to the image intensifier and film cassette or display unit. The patient table can be rotated to an upright position for certain examinations and can be lowered to horizontal position for other imaging procedures. In some instances, the unit can be operated from outside the room.
Today, the transition from conventional to digital fluoroscopy replaces the image intensifier. A flat-panel detector in combination with sensitive image sensors and digital image processing improves the diagnostic ability of a modern system.
Gamma Ray
Gamma rays are a form of nuclear radiation that consists of photons emitted by radioactive elements from the nucleus. This high energetic light emission is also produced from subatomic particle interaction, such as electron positron annihilation. Gamma radiation, similar to x-radiation can injure and destroy tissue, especially cell nuclei.
Gamma rays have in general very high frequencies, short wavelengths, are electrically neutral and penetrate matter. The interaction of gamma rays with matter depends on the nature of the absorber as well as the energy of the gamma rays; these interactions determine also the type and amount of shielding needed for radiation protection.

See also Radiation Safety, Lead Equivalence, Lead Apron, Leaded Glove, Glove-Box, Radioactive Decay Law and Radiation Worker.
Grid
Grids are used in a test phantom to check the quality of x-ray images. Such a grid may consist for example, of gold structures on a silicon surface and a grid period length of 2 micrometer with space wide in between of 1 micrometer.
Filter grids are also used in x-ray imaging to reduce noise contributed by scatter.
Half-Life
[Also: Half-Life Time, Radioactive Half-Life] The half-life is the time in which half the atoms (always a fraction, not a number) of a given radionuclide disintegrate from the amount of atoms present when measurement starts. From 200 atoms of a radionuclide with a half-life of one minute will 100 atoms disintegrate in the first minute, 50 in the second minute, etc. The half-life is a characteristic property of radioactive isotopes. The effective half-life includes all processes of elimination, including radioactive decay.
Different half-life terms:
- Physical Radioactive Half-Life
- Biological Radioactive Half-Life
- Effective Radioactive Half-Life.

See also Decay Constant, Decay.
Hypaque Meglumine
Hypaque Meglumine is an ionic contrast agent. Hypaque Meglumine 60 percent (w/v) is an aqueous solution containing 60 g of the meglumine salt of diatrizoic acid per 100 mL of solution.
The degree of contrast enhancement at computed tomography is directly related to the amount of iodine administered. In adults the amount of iodine usually required for contrast enhancement ranges from 28 to 42 g.
Hypaque Meglumine is also available in concentrations of 18% and 30%.

Drug Information and Specification
NAME OF COMPOUND
Diatrizoate meglumine
MANUFACTURER
INDICATION
Urography, angiography, CT head
APPLICATION
Intravascular
PHARMACOKINETIC
Renal excretion
CHEMICAL BOND
1415 mosm/kgH2O
IODINE CONCENTRATION
282 mg/mL
50 - 100 mL bolus injection, up to 150 mL by infusion
PREPARATION
Ready-to-use product
STORAGE
Protect from light. Store at 15°Celsius to 30°C (59° Fahrenheit to 86°F).
PRESENTATION
50 and 100 mL vials, 200 mL bottles
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!
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 [last update: 2023-11-06 02:01:00]