Radioactive Tracer
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  Radioactive Tracer



Radioactive Tracer

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

RELATED TERMS
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Contrast
"Short for ""contrast media."" Contrast media are X-ray dyes used to provide contrast, for example, between blood vessels and other tissue."

Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.



SIMILAR TERMS
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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).

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

Radiation therapy
The use of radiation energy to interfere with tumor growth. See irradiation.

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.

Radiculopathy
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.

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

Radiofrequency
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.

Radiography
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.

Radioisotope
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.

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

Radiology
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.

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

Radioresistant
Resistant to radiation therapy.

Radiosensitive
Responsive to radiation therapy.

Radiosurgery
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.

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



PREVIOUS AND NEXT TERMS
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Renal Threshold
When the blood is holding so much of a substance such as glucose (sugar) that the kidneys allow the excess to spill into the urine. This is also called "kidney threshold," "spilling point," and "leak point."

Risk Factor
Anything that raises the chance that a person will get a disease. With noninsulin-dependent diabetes, people have a greater risk of getting the disease if they weigh a lot more (20 percent or more) than they should.

Rosiglitazone (Avandia)
A drug used as a treatment for Type 2 (noninsulin-dependent) diabetes; belongs to a class of drugs called thiazolidinediones.

ROOT CANAL THERAPY
When a tooth abscesses or has a pulp (nerve) exposure due to decay or trauma, root canal therapy or endodontic treatment is performed so that the damaged tooth may remain in the mouth and be saved. Years ago, if a tooth abscessed, it had to be extracted. Today dentists can save teeth by removing the pulp, the soft tissue in the root, cleaning and shaping the canal or canals and filling the root to seal out recontamination of the root system. This procedure is usually done in one to three visits with relatively little pain. If the abscess is severe, antibiotics may be used to help heal the infection. In almost all cases a crown and post (See "Crown") will be needed to restore the tooth to proper function and appearance. Root canal teeth can last a lifetime with proper care of the teeth and gums.

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.

Radioactive Tracer

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

Raynaudís Phenomenon
Spasms of the small arteries of the fingers, and sometimes, the toes, brought on by exposure to cold or excitement.

Red blood Cell (erythrocyte, red cell, red corpuscle)
Red blood cell that delivers oxygen to tissues and removes carbon dioxide and other waste products.

Recipient
A patient who receives an organ, tissue or blood from another person.

Rejection
The process by which the body tries to get rid of a transplanted organ or tissue by producing antibodies. Immunosuppressive drugs help to prevent rejection.

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