Subtraction
41Intravenous 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… …
42Dark-frame subtraction — In digital photography, dark frame subtraction is a way to minimize image noise for pictures taken with long exposure times. It takes advantage of the fact that a component of image noise, known as fixed pattern noise, is the same from shot to… …
43Minimal subtraction scheme — In quantum field theory, the minimal subtraction scheme, or MS scheme is a particular renormalization scheme used to absorb the infinities that arise in perturbative calculations beyond leading order, introduced independently by t Hooft (1973)… …
44Dark frame subtraction — In digital photography, dark frame subtraction is a way to minimize image noise for pictures taken with long exposure times. It takes advantage of the fact that a component of image noise is the same from shot to shot: noise from the sensor, dead …
45digital 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 …
46digital 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 …
47interceptive subtraction — in the law of restitution, a term applied by some commentators to a taking away from the pursuer, which happens by the defender acquiring value that would otherwise have reached the pursuer. The value subtracted can thus be treated as an unjust… …
48do subtraction — index diminish Burton s Legal Thesaurus. William C. Burton. 2006 …
49digital 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… …
50thallium-technetium isotope subtraction imaging — a technique to image the parathyroid glands. Technetium is taken up only by the thyroid gland, but thallium is taken up by both the thyroid and parathyroid glands. digital subtraction of the two isotopes leaves an image of the parathyroid glands… …
