| CT | <investigation, procedure, radiology> A special radiographic technique that uses a computer to assimilate multiple X-ray images into a 2 dimentional cross-sectional image. This can reveal many soft tissue structures not shown by conventional radiography. Scans may also be dynamic in which a movement of a dye is tracked. Cuts may be 5 or 10 mm apart or, in some instances even further apart. A special dye material may be injected into the patients vein prior to the scan to help differentiate abnormal tissue and vasculature. The machine rotates 180 |
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| CT number | A normalised value of the calculated X-ray absorption coefficient of a pixel (picture element) in a computed tomogram, expressed in Hounsfield units, where the CT number of air is -1000 and that of water is zero. Synonym: Hounsfield number. (05 Mar 2000) |
| CT scan | <investigation, procedure, radiology> A special radiographic technique that uses a computer to assimilate multiple X-ray images into a 2 dimentional cross-sectional image. This can reveal many soft tissue structures not shown by conventional radiography. Scans may also be dynamic in which a movement of a dye is tracked. Cuts may be 5 or 10 mm apart or, in some instances even further apart. A special dye material may be injected into the patients vein prior to the scan to help differentiate abnormal tissue and vasculature. The machine rotates 180 |
| CT unit | A unit of X-ray attenuation in each picture element of the CT image. See: Hounsfield unit. (05 Mar 2000) |
| CT value | <molecular biology> Concentration of DNA molecules (in moles) multiplied by time. The value is used to plot the renaturing (complementary single strands of DNA spontaneously forming into a double-stranded molecule) of DNA after it has been denatured (DNA molecule which has been broken into two individual single strands). (26 Mar 1998) |
| CTD | <abbreviation> Cumulative trauma disorders. (05 Mar 2000) |
| Ctenocephalides | A genus of fleas. Ctenocephalides canis (dog flea) and Ctenocephalides felis (cat flea) are nearly universal ectoparasites of household pets; will attack man when starving owing to absence of pets. Origin: G. Ktenodes, like a cockle, + kephale, head (05 Mar 2000) |
| CTL | <abbreviation> Cytotoxic T lymphocytes. (05 Mar 2000) |
| CTP | <abbreviation> Cytidine 5'-triphosphate. (05 Mar 2000) |
| CTP-CMP-3-deoxynonulosonate cytidyltransferase | <enzyme> From testis of rainbow trout; responsible for synthesis of cmp-deaminoneuraminic acid from deaminoneuraminic acid and ctp; presence of mg(2+) or mn(2+) essential for activity Registry number: EC 2.7.7.- Synonym: cmp-kdn synthetase (26 Jun 1999) |
| CTP-RNA cytidylyltransferase | <enzyme> Catalyses addition of cmp residue to 3'-ends of oligonucleotide primers Registry number: EC 2.7.7.- Synonym: terminal cytidylyltransferase (26 Jun 1999) |