Flashcards in Chap 20, Vocabulary, Radiology and Nuclear Medicine Deck (29)
computed tomography (CT)
Diagnostic x-ray procedure whereby a cross-sectional image of a specific body segment is produced. Newer CT scanners can create 3D images as well.
Radiopaque materials (contrast media) are injected to obtain contrast with surrounding tissue when shown on the x-ray film.
Machine to detect gamma rays emitted from radiopharmaceuticals during scanning for diagnostic purposes.
High-energy rays emitted by radioactive substances in tracer studies.
Time required for a radioactive substance to lose half its radioactivity by disintegration.
Therapeutic or diagnostic procedures performed by a radiologist. Examples are needle biopsy of a mass and drainage of an abscess, typically under the guidance of CT or Fluoroscopy.
Process, test, or procedure is performed, measured, or observed outside a living organism, often in a test tube.
Process, test, or procedure is performed, measured, or observed within a living organism.
Transformation of electrically neutral substances into electrically charged particles. X-rays cause ionization of particles within tissues.
magnetic resonance imaging (MRI)
Magnetic field and radio waves produce sagittal, coronal, and axial images of the body.
Medical specialty that uses radioactive substances (radionuclides) in the diagnosis of disease.
positron emission tomography (PET)
Positron-emitting radioactive substances given intravenously create a cross-sectional image of cellular metabolism based on local concentration of the radioactive substance. PET scans give information about metabolic activity.
Test combines radioactive chemicals and antibodies to detect minute quantities of substances in a patient's blood.
Radioactive form of an element substance; radionuclide.
Radiopharmaceutical; used in nuclear medicine studies.
Medical specialty concerned with the study of x-rays and their use in the diagnosis of disease. It includes other forms of energy, such as ultrasound and magnetic waves. Also called diagnostic radiology.
Permitting the passage of x-rays. Radiolucent structures appear black on x-ray images.
Radioactive form of an element that gives off energy in the form of radiation; radioisotope.
Obstructing the passage of x-rays. Radiopaque structures appear white on the x-ray images.
Radioactive drug (radionuclide plus chemical) that is administered safely for diagnostic and therapeutic purposes; a radiotracer. An example is technetium 99m, which combines with albumin (for lung perfusion) and DTPA (for renal imaging).
Image of an area, organ or tissue of the body obtained from ultrasonography, radioactive tracer studies, computed tomography, or magnetic resonance imaging.
Diagnostic nuclear medicine test using radiopharmaceuticals and gamma cameras to create images.
singe photon emission computed tomography (SPECT)
Radioactive tracer is injected intravenously and a computer reconstructs a 3D image based on a composite of many views.
Attaching a radionuclide to a chemical and following its path in the body.
Radionuclides are used as tags, or labels, attached to chemicals and followed as they travel through the body.
ultrasonography (US, U/S)
Diagnostic technique that projects and retrieves high-frequency sound waves as they echo off parts of the body.
Handheld device that sends and receives ultrasound signals.
Rate of absorption of a radionuclide into an organ or tissue.