perfusion scan

perfusion scan
a technique for demonstrating an abnormal blood supply to an organ by injecting a radioactive tracer or contrast medium. One of the most common uses, often in conjunction with ventilation scanning (see ventilation-perfusion scanning), is to detect obstruction of pulmonary arteries due to embolism by thrombus (see pulmonary embolism). Particles labelled with radioactive tracer are injected intravenously and become temporarily lodged in the capillaries in the lungs. Areas not being perfused show up as holes on the gamma-camera images. In magnetic resonance imaging or computerized tomography, contrast medium is injected and a series of images is obtained. The rate of change of enhancement is an index of the blood supply to the area of interest. This technique can be used to study blood supply to the brain, heart, or kidneys (in particular), to help diagnose arterial strictures or blockages, or tumours in which blood supply may be increased by abnormal vessels.

Medical dictionary. 2011.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • perfusion scan — a technique for demonstrating an abnormal blood supply to an organ by injecting a radioactive tracer or contrast medium. One of the most common uses, often in conjunction with ventilation scanning (see ventilation perfusion scanning), is to… …   The new mediacal dictionary

  • Myocardial perfusion scan — is a nuclear medicine procedure that evaluates many heart conditions from Coronary artery disease (CAD) to hypertropic cardiomyopathy and myocardial wall motion abnormalities. The function of the myocardium is also evaluated by calculating the… …   Wikipedia

  • Ventilation/perfusion scan — A ventilation/perfusion lung scan, also called a V/Q lung scan, is a type of medical imaging used to evaluate the circulation of air and blood within a patient s lungs. The ventilation part of the test looks at the ability of air to reach all… …   Wikipedia

  • ventilation-perfusion scan — V/Q scan a scintigraphic technique for demonstrating perfusion defects in normally ventilated areas of the lung in the diagnosis of pulmonary embolism, consisting of the imaging of the distribution of an inhaled radionuclide followed by the… …   Medical dictionary

  • Perfusion scanning — Perfusion is defined as the passage of fluid through the lymphatic system or blood vessels to an organ or a tissue. [American Psychological Association (APA):perfusion. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved March 20, 2008, from… …   Wikipedia

  • scan — 1. To survey by traversing with an active or passive sensing device. 2. The image, record, or data obtained by scanning, usually identified by the technology or device employed; e.g., CT s., radionuclide s …   Medical dictionary

  • Myocardial perfusion imaging — Intervention Nuclear medicine myocardial perfusion scan with Thallium 201 for the rest images (bottom rows) and Tc Sestamibi for the stress images (top rows). The nuclear medicine myocardial perfusion scan plays a pivotal role in the noninvasive… …   Wikipedia

  • Octreotide scan — Diagnostics 111In pentetreotide scintigraphy of the 41 year old man with ectopic Cushing syndrome caused by a neuroendocrine carcinoma of the mesentery. Radiotracer accumulation in the left thyroid in 10/2003 (arrow). The mesenterial… …   Wikipedia

  • Ventilation/perfusion ratio — In respiratory physiology, the ventilation/perfusion ratio (or V/Q ratio) is a measurement used to assess the efficiency and adequacy of the matching of two variables: [LoyolaMedEd|Medicine/pulmonar/physio/pf9.htm#q1] * V ventilation the air… …   Wikipedia

  • Persantine thallium scan — A type of myocardial perfusion scan done to disclose any areas of the heart muscle that may not be getting enough blood to perfuse them properly. Persantine (Diprydamole) is a medication that dilates (widens) the coronary arteries. It produces an …   Medical dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”