| 释义 |
tomography Med.|təˈmɒgrəfɪ|
[f. Gr. τόµος slice, section + -graphy.]
Radiography in which an image of a predetermined plane in the body or other object is obtained by rotating the detector and the source of radiation in such a way that points outside the plane give a blurred image. Also in extended use, any analogous technique using other forms of radiation.
1935Brit. Jrnl. Radiol. VIII. 750 The most significant field of application for the method of reproducing body layers (tomography) will, in practice, be lung diagnosis. 1949Ibid. XXII. 627/1 Today, sectional röntgenography, commonly called tomography has indeed, in many places, found recognition as a method of radiological diagnosis. 1968Brit. Med. Bull. XXIV. 242/1 With the advent of transverse tomography, it is now possible to get much more accurate estimations of the various volumes and areas of tissues of differing density, in any cross-section of the body. 1977‘E. Trevor’ Theta Syndrome iii. 40 The axial tomography revealed bilateral subdural hematomas. 1982New Scientist 21 Jan. 155/1 Paul Carson and others..have been comparing the new-developed technique of ultrasonic computed tomography (UCT) with pulse echo imaging. 1983Ibid. 17 Mar. 725/3 Tree physiology and dendrochronology are just two of the possible applications for portable computer tomography. 1984McGraw-Hill Yearbk. Sci. & Technol. 1985 335/1 Positron emission tomography (PET scan) now allows scientists to measure noninvasively the functional activity of the living human brain.
So ˈtomogram, an X-ray picture taken by tomography; ˈtomograph, (a) a tomogram; (b) an apparatus for carrying out tomography; tomoˈgraphic a., tomoˈgraphically adv.
1935Brit. Jrnl. Radiol. VIII. 736 The new tomographic method is also based upon the principle of the method already mentioned. Ibid. 750 Three tomographs are generally sufficient for lung diagnosis. Ibid., A new device, the tomograph, is described, which permits the radiography of body layers of any size and variable thickness. 1936Lancet 25 July 185/2 For all practical purposes three tomograms are ample for accurate diagnosis. 1949Radiography XV. 242/1 (caption) Aneurysm demonstrated by lesion of dorsal vertebræ tomographically. 1950Times 22 Nov. 6/6 The infection was discovered, thanks to the use of a tomograph, a new X-ray apparatus, apparently during Sir Stafford Cripps's last stay at Zurich. 1955D. B. Fry in B. I. Evans Stud. in Communication 156 The internal action of the larynx was for a long time inaccessible to X-ray photography but the development of the tomogram technique has enabled Ardram and Kemp to obtain remarkable pictures of the larynx in action. 1968Tomographic [see laminagraphic a.]. 1975Radio Times 1–7 Nov. 7/1 The EMI (‘Emmy’)-scanner is a machine for taking axial X-ray tomograms. 1975Sci. Amer. Oct. 56/3 In most tomographic instruments the X-ray source moves in one direction and the photographic film simultaneously moves in the opposite direction. The patient lies in between. 1976Physics Bull. Oct. 436/3 X-ray tomography has become a popular method of medical imaging over the past few years... A M Cormack and A M Koehler have come up with an alternative idea for improving the density resolution of tomographs. 1982Times 26 July 2/3 Using the tomograms, the interior of the helmet has now been excavated. |