| dynamic psychology | A psychologic approach that concerns itself with the causes of behaviour. (05 Mar 2000) |
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| dynamic psychotherapy | Psychotherapy utilizing freudian principles. See: psychoanalysis. Synonym: dynamic psychotherapy. (05 Mar 2000) |
| dynamic range | <microscopy> In video and other electronic equipment and in photographic emulsions, the ratio of the maximum to minimum signal levels that introduce no more than acceptable levels of signal amplitude distortions. (05 Aug 1998) |
| dynamic refraction | Refraction of the eye during accommodation. (05 Mar 2000) |
| dynamic relations | Relative movements between two objects, e.g., the relationship of the mandible to the maxillae. (05 Mar 2000) |
| dynamic school | A group of theorists founded by Stahl, who professed the belief that all vital action is the result of an internal force independent of anything external to the body. (05 Mar 2000) |
| dynamic splint | A splint utilizing springs or elastic bands that aids in movements initiated by the patient by controlling the plane and range of motion. Synonym: active splint, functional splint. (05 Mar 2000) |
| dynamic viscosity | The internal or molecular frictional resistance of a fluid by Newton's law of viscosity as the ratio of the applied force per unit area to the relative velocity of adjacent fluid layers (produced by the force). (05 Mar 2000) |
| instrascene dynamic range | <microscopy> The greatest ratio of highlight to shadow brightness to within a single scene that a video camera (tube) can handle usefully. Contrast with the usable light range of a camera, which is considerably greater than the instrascene dynamic range. See: illumination, Kohler. (05 Aug 1998) |
| abscess scan | <investigation> This is a nuclear scan that utilises radioactively tagged white blood cells. The patients white blood cells (taken from a small tube of blood) are tagged with radioactive indium. Later, the cells are then reinjected into the bloodstream. The coarse of the white blood cells can then be mapped using a gamma camera (radiation detecting device). The net result is a picture that shows the location of the radioactive white blood cells. The location of the white cells can indicated the presence of infection or inflammation. This test is useful in detecting a hidden source of bacterial infection, such as an abscess. (11 Mar 1998) |
| biliary scan | <investigation, radiology> A test that uses a radioactive tracer to look for bile duct obstruction or gallbladder inflammation. A special tracer is injected into a vein that tends to collect primarily in the liver. It is then excreted in the bile where it makes its way to the gallbladder. A gamma camera measures the tracer (radioactivity) and generates an image of the gallbladder and biliary system. (27 Sep 1997) |
| bone scan | <investigation, radiology> A study of the body skeleton. A dose of radioactive substance is injected and the scan (taken a little time later) reads the distribution of the radioactivity. (16 Dec 1997) |
| bone scan: falsely negative metastases | <radiology> Anaplastic tumours, reticulum cell sarcoma, renal cell carcinoma, thyroid carcinoma, histiocytosis, neuroblastoma, multiple myeloma (positive scan usually due to recent or impending fracture) (12 Dec 1998) |
| captopril renal scan | <radiology> In a kidney with a lesion in the afferent arteriole (e.g. Atherosclerotic plaque), reflex constriction of the efferent arteriole occurs through angiotensin system thus maintaining renal perfusion. ACE inhibition prevents constriction of efferent arteriole. Therefore, perfusion is decreased to a kidney with afferent lesions and the renal scan to looks WORSE. Bottom line: renal scans appear WORSE with captopril administration if there is a lesion in the afferent arteriole. See: renal artery stenosis (12 Dec 1998) |
| gallbladder scan | <investigation, radiology> A test that uses a radioactive tracer to look for bile duct obstruction or gallbladder inflammation. A special tracer is injected into a vein that tends to collect primarily in the liver. It is then excreted in the bile where it makes its way to the gallbladder. A gamma camera measures the tracer (radioactivity) and generates an image of the gallbladder and biliary system. (27 Sep 1997) |