| whole-body irradiation | Irradiation of the whole body with ionizing or non-ionizing radiation. It is applicable to humans or animals but not to microorganisms. (12 Dec 1998) |
|---|---|
| cranial irradiation | The exposure of the head to roentgen rays or other forms of radioactivity for therapeutic or preventive purposes. (12 Dec 1998) |
| hemibody irradiation | Irradiation of one half or both halves of the body in the treatment of disseminated cancer or widespread metastases. It is used to treat diffuse metastases in one session as opposed to multiple fields over an extended period. The more frequent treatment modalities are upper hemibody irradiation (uhbi) or lower hemibody irradiation (lhbi). Less common is mid-body irradiation (mbi). In the treatment of both halves of the body sequentially, hemibody irradiation permits radiotherapy of the whole body with larger doses of radiation than could be accomplished with whole-body irradiation. It is sometimes called "systemic" hemibody irradiation with reference to its use in widespread cancer or metastases. (p. Rubin et al. Cancer, vol 55, p2210, 1985) (12 Dec 1998) |
| prophylactic cranial irradiation | Radiation therapy to the head to prevent cancer from spreading to the brain. (12 Dec 1998) |
| irradiation | Treatment by ionising radiation, such as X-rays or radioactive sources such as radioactive iodine seeds. See: radiation therapy. (16 Dec 1997) |
| total body irradiation | Radiotherapy often given in several doses prior to bone marrow transplantation with the aim of killing any residual leukaemia in the patient. It is used in conjunction with high-dose anti-cancer drugs. The procedure and its side-effects will be discussed individually with the patient. (13 Nov 1997) |
| lymphatic irradiation | External or interstitial irradiation to treat lymphomas (e.g., hodgkin's and non-hodgkin's lymphomas) and lymph node metastases and also some autoimmune diseases, such as rheumatoid arthritis. (12 Dec 1998) |
| sagittal split mandibular osteotomy | An intraoral surgical procedure for correction of retrognathism, apertognathia, and prognathism; the mandibular rami and posterior body are sectioned in the sagittal plane. (05 Mar 2000) |
| split | 1. To divide lengthwise; to separate from end to end, especially. By force; to divide in the direction of the grain layers; to rive; to cleave; as, to split a piece of timber or a board; to split a gem; to split a sheepskin. "Cold winter split the rocks in twain." (Dryden) 2. To burst; to rupture; to rend; to tear asunder. "A huge vessel of exceeding hard marble split asunder by congealed water." (Boyle) 3. To divide or break up into parts or divisions, as by discord; to separate into parts or parties, as a political party; to disunite. 4. <chemistry> To divide or separate into components; often used with up; as, to split up sugar into alcohol and carbonic acid. To split hairs, to make distinctions of useless nicety. Origin: Probably of Scand. Or Low german origin; cf. Dan. Splitte, LG. Splitten, OD. Splitten, spletten, D. Splijten, G. Spleissen, MHG. Splizen. Cf. Splice, Splint, Splinter. 1. Divided; cleft. 2. <botany> Divided deeply; cleft. Split pease, hulled pease split for making soup, etc. <machinery> Split pin, a pin with one end split so that it may be spread open to secure it in its place. Split pulley, a parting pulley. See Pulley. Split ring, a ring with overlapped or interlocked ends which may be sprung apart so that objects, as keys, may be strung upon the ring or removed from it. Split ticket, a ballot containing the names of only a portion of the candidates regularly nominated by one party, other names being substituted for those omitted. Source: Websters Dictionary (01 Mar 1998) |
| split brain | A brain in which the corpus callosum and usually the anterior and posterior commissures have been sectioned; usually to treat certain refractory epilepsies. (05 Mar 2000) |
| split cast method | A procedure for placing indexed casts on an articulator to facilitate their removal and replacement on the instrument, the procedure of checking the ability of an articulator to receive or be adjusted to a maxillomandibular relation record. Synonym: Needles' split cast method. (05 Mar 2000) |
| split cast mounting | A cast with key grooves on its base, mounted on an articulator for the purpose of easy removal and accurate replacement; split remounting metal plates may be used instead of grooves in casts, a means for testing the accuracy of articulator adjustment. (05 Mar 2000) |
| split fat | Free fatty acids, as reduced by the action of lipases, neutral fats, or phospholipids. (05 Mar 2000) |
| split gene | Non-coding, intervening sequences of DNA that are transcribed, but are removed from within the primary gene transcript and rapidly degraded during maturation of messenger RNA. most genes in the nuclei of eukaryotes contain introns, as do mitochondrial and chloroplast genes. (12 Dec 1998) |
| split genes | Genes where the genomic sequences are interrupted by intervening sequences (introns) that are spliced out of the mRNA prior to translation. (05 Mar 2000) |