| IDF | inverse document frequency |
|---|---|
| IRV | inferior radicular vein; inspiratory reserve volume; inverse ratio ventilation |
| RTx | Radiotherapy |
| BREASTS | bronchopulmonary aspergillosis, radiotherapy, extrinsic allergic alveolitis, ankylosing spondylitis,... |
| CART | computer-assisted radiotherapy |
| IPCR | Inverse PCR |
|---|---|
| IPCR | Inverse polymerase chain reaction |
| IRV | Inverse ratio ventilation |
| PC-IRV | pressure controlled inverse ratio ventilation |
| CHART | Continuous Hyperfractionated Accelerated Radiotherapy |
| radiotherapy | <oncology> The treatment of disease by ionising radiation. Origin: Gr. Therapeia = cure (18 Nov 1997) |
|---|---|
| radiotherapy, adjuvant | Radiotherapy given to augment some other form of treatment such as surgery or chemotherapy. Adjuvant radiotherapy is commonly used in the therapy of cancer and can be administered before or after the primary treatment. (12 Dec 1998) |
| radiotherapy, computer-assisted | Computer systems or programs used in accurate computations for providing radiation dosage treatment to patients. (12 Dec 1998) |
| radiotherapy dosage | The total amount of radiation absorbed by tissues as a result of radiotherapy. (12 Dec 1998) |
| radiotherapy, high-energy | Radiotherapy using high-energy (megavolt or higher) ionizing radiation. Types of radiation include gamma rays, produced by a radioisotope within a teletherapy unit; X-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutrons and pi-mesons (pions), produced as secondary particles following bombardment of a target with a primary particle. (12 Dec 1998) |
| radiotherapy localization | Planning the size and alignment of radiation beams to encompass the neoplasm to be treated. (05 Mar 2000) |
| radiotherapy planning, computer-assisted | Computer-assisted mathematical calculations of beam angles, intensities of radiation, and duration of irradiation in radiotherapy. (12 Dec 1998) |
| inverse | 1. Opposite in order, relation, or effect; reversed; inverted; reciprocal; opposed to direct. 2. <botany> Inverted; having a position or mode of attachment the reverse of that which is usual. 3. <mathematics> Opposite in nature and effect; said with reference to any two operations, which, when both are performed in succession upon any quantity, reproduce that quantity; as, multiplication is the inverse operation to division. The symbol of an inverse operation is the symbol of the direct operation with -1 as an index. Thus sin -1 x means the arc whose sine is x. <geometry> Inverse figures, two points lying on a line drawn from the center of a fixed circle or sphere, and so related that the product of their distances from the center of the circle or sphere is equal to the square of the radius. <mathematics> Inverse, or Reciprocal, ratio, the ratio of the reciprocals of two quantities. Inverse, or Reciprocal, proportion, an equality between a direct ratio and a reciprocal ratio; thus, 4: 2:: 1/3: 1/6, or 4: 2:: 3: 6, inversely. Origin: L. Inversus, p. P. Of invertere: cf. F. Inverse. See Invert. Source: Websters Dictionary (01 Mar 1998) |
| inverse anaphylaxis | Anaphylactic shock in an animal (e.g., guinea pig) whose tissues contain Forssman antigen, resulting from an intravenous injection of serum that contains Forssman's antibody. (05 Mar 2000) |
| inverse density dependence | <epidemiology> See density dependence. (05 Dec 1998) |
| inverse ocular bobbing | Slow downward eye movement followed by delayed quick upward return. (05 Mar 2000) |
| inverse square law | As applied to point sources, the intensity of radiation diminishes in proportion to the square of the distance from the source. (05 Mar 2000) |
| inverse symmetry | Correspondence of the right or left side of an asymmetrical individual to the left or right side of another. (05 Mar 2000) |
| inverse syntropy | A situation in which the presence of one disease tends to decrease the possibility of another. (05 Mar 2000) |
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