SQLSTATE[42000] [1203] User dic already has more than 'max_user_connections' active connections digital subtraction


digital subtraction

a radiological technique that enhances X-ray images, most commonly of blood vessels (see angiography). A digitized image is taken before the contrast medium (a ‘mask’) is added, and this is subtracted by computer from the images taken after contrast injection. Only the outline of the blood vessel or other structure containing contrast medium remains on the image. The technique enables blood-vessel anatomy and blood supply to an organ to be demonstrated more clearly. It is very dependent on the patient remaining still, since movement causes severe loss of image (movement artifact). The technique can also be used in nuclear medicine using two different tracers to look for parathyroid gland tumours.

The new mediacal dictionary. 2014.

Look at other dictionaries:

  • digital subtraction — a sophisticated radiological technique in which digitization allows X ray examination, most commonly of blood vessels (see angiography), to be performed using smaller volumes of contrast material. A digitized image is taken before the contrast… …   Medical dictionary

  • Digital subtraction angiography — Intervention Example of iodine based contrast in cerebral angiography MeSH …   Wikipedia

  • digital subtraction aortography — digital subtraction angiography of the aorta. Digital subtraction aortography of a normal aortic arch, in a left anterior oblique (Lao) projection. A Ao, ascending aorta; D Ao, descending aorta; BC,brachiocephalic artery; LCC, left common carotid …   Medical dictionary

  • digital subtraction radiography — use of digital subtraction to monitor the flow of contrast medium on radiographs over time; the most common application is digital subtraction angiography …   Medical dictionary

  • digital subtraction angiography — a computerized x ray technique in which arteries are visualized following injection of dye into a vein. Abbr.: DSA * * * …   Universalium

  • digital subtraction angiography — an angiographic technique that produces images by subtracting background structures and enhancing the contrast of those areas that change in density between a preliminary “mask” image and subsequent images …   Medical dictionary

  • digital subtraction angiography — a computerized x ray technique in which arteries are visualized following injection of dye into a vein. Abbr.: DSA …   Useful english dictionary

  • Intravenous digital subtraction angiography — (IV DSA) is a form of angiography which was first developed in the late 1970s. IV DSA uses a computer technique which compares an x ray image of a region of the body before and after radiopaque iodine based dye has been injected intravenously… …   Wikipedia

  • intra-arterial digital subtraction angiography — a type of arteriography that uses electronic circuitry to subtract the background of bone and soft tissue to provide a useful image of the arteries injected with contrast medium …   Medical dictionary

  • intravenous digital subtraction angiography — a type of phlebography that uses electronic circuitry to subtract the background of bone and soft tissue to provide a useful image of the veins injected with contrast medium …   Medical dictionary

Share the article and excerpts

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

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.