Protocol

An outline of care; a treatment plan. An action plan for a clinical trial will state what the study will do, how, and why. It explains how many people will be in it, who is eligible to participate, what study agents or other interventions they will be given, what...

Rad

Total amount of radiation absorbed by specific material or tissues. 1) The unit for the dose absorbed from ionizing radiation, equivalent to 100 ergs per gram of tissue; 100 rad = 1 Gy. Symbol for radian. 2) Abbreviation for racemic.

Radiation Dermatosis

Skin changes at the site of ionizing radiation. Particularly redness of the skin due to capillary dilatation in the acute stage, temporary or permanent loss of hair, and chronic changes in the epidermis and dermis resembling a premalignant warty lesion.

Radiation Therapy

The use of radiation energy to interfere with tumor growth. See irradiation. The use of high-energy radiation from x-rays, gamma rays, neutrons, protons, and other sources to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body...

Radiography

Examination of any part of the body for diagnostic purposes by means of x-rays with the record of the findings usually impressed upon a photographic film. Radiography is the examination of a specimen or any part of the body, usually for diagnostic purposes, by means...

Radiologist

A physician trained in the diagnostic and/or therapeutic use of x-rays and radionuclides, radiation physics, and biology. A diagnostic radiologist may also be trained in diagnostic ultrasound and magnetic resonance imaging and applicable physics.