Radiation Therapy
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  Radiation Therapy

Radiation Therapy

    The use of x-rays, gamma rays, or electrons to treat cancers.


Electromagnetic radiations that, because of their penetrating power, are used to record on film shadows of the varying densities within a part of the body.

Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS or BETA RAYS, the latter being a high-energy biproduct of nuclear decay.


Radial Artery
The radial artery is the blood vessel that carries oxygen-rich blood in the forearm. You can feel the pulse of the radial artery by feeling the forearm just underneath the thumb. There are three arteries in the normal forearm that carry blood to the hand.

Radiation colitis
Damage to the colon from radiation therapy.

Radiation enteritis
Damage to the small intestine from radiation therapy.

Radiation oncologist/radiation therapist
A radiologist who specializes in the use of radioactive substances and x-rays for the treatment of tumors and cancer.

Radiation Oncology
The study and treatment of cancers using radiation (x-rays, gamma rays or electrons).

Radical prostatectomy
Surgery to remove the prostate along with the two seminal vesicle glands attached to the prostate.

Radical retropubic prostatectomy
An operation to remove the entire prostate gland and seminal vesicles through the lower abdomen.

A disease or other problem affecting a nerve root.

Radio-iodinated I 125 serum albumin human
Radio-iodinated I 125 serum albumin human is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): albumin iodinated I-125 serum.

Radioactive Tracer
A low-dose radioactive dye or contrast medium injected into a blood vessel as part of an imaging procedure.

Radioallergosorbent test (RAST)
A solid-phase radioimmunoassay for detecting IgE antibody specific for a particular allergen.

An invasive procedure that involves heating tissue in order to destroy it.; used to treat some types of rapid heart rhythms.

Radiogardase prussian blue
Radiogardase prussian blue is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): ferric hexacyanoferrateII.

The treatment of disease (especially cancer) by exposure to radiation.

Radioimmunoassay (RIA)
A widely used technique for measurement of primary antigen-antibody interactions, and for the determination of the level of important biological substances in mixed samples. It takes advantage of the specificity of the antigen-antibody interaction and the sensitivity that derives from measurement of radioactively labelled materials.

Radioiodinated serum albumin human ihsa I 125
Radioiodinated serum albumin human ihsa I 125 is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): albumin iodinated I-125 serum.

A radioactive material injected into the body so that a nuclear scanner can make pictures.

Radioisotope scan
Uses radioactive substances introduced into the body to create an image of the functioning adrenal gland.

A physician trained in the use of radioactive substances, x-rays, and other imaging techniques to arrive at a diagnosis.

The branch of medicine that deals with the use of x-rays.

Radionuclide scans
Tests to find GI bleeding. Radioactive material is injected to highlight organs on a special camera. Also called scintigraphy.

Radionuclide ventriculography
A diagnostic procedure used to determine the shape and size of the heart's chambers.

Radionuclide-labeled 125 I fibrinogen human sensor
Radionuclide-labeled 125 I fibrinogen human sensor is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): fibrinogen, I-125.

Also tracer or radionuclide. Basic radioactively tagged compound necessary to produce a nuclear medicine image.

Resistant to radiation therapy.

Responsive to radiation therapy.

A radiation therapy technique that uses a large number of narrow, precisely aimed, highly focused beams of ionising radiation. The beams are aimed from many directions circling the head and meet at a specific point.

Specific treatment of diseases such as cancer using high energy X-rays.


Risk factors
Traits that make it more likely that a person will develop an illness.

Restless Leg Syndrome (RLS)
Wittmaack-Ekbom or restless legs syndrome is a disorder of the nervous system that affects sensation and movement in the legs and causes the limbs to feel uncomfortable. Relief can be temporarily gained by moving the legs which cause sufferers to seem fidgety and restless.

A natural or synthetic substance derived from vitamin A.

Rohypnol (the trade name of flunitrazepam) is a sedative that was made in the early 1970's by Roche and was used in hospitals only for deep sedation. It was first released on the market in 1975 in tablet form in Europe. The tablet was then released in the early 1980's to other countries. It came in 5 mg, 2 mg, and 1 mg sizes, but due to its strength the higher doses were taken off the market and now it only comes in one strength: 1 mg. It is the strongest sleeping tablet to ever be made.

Radiation Oncology
The study and treatment of cancers using radiation (x-rays, gamma rays or electrons).

Radiation Therapy

Range of motion
the extent that a joint will move from full extension to full flexion.

Resting tremor
A tremor of a limb that increases when the limb is at rest.

The tendency to step backwards if bumped from the front or upon initiating walking, usually seen in patients who tend to lean backwards because of problems with balance.

Insertion and temporary fixation of partially or completely avulsed tooth or teeth, resulting from traumatic injury.

Acrylic restoration of denture base to compensate for bone loss; direct: done at chairside; indirect: in conjunction with a dental laboratory.

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