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orthoroentgenography Med.
(ˌɔːθəʊrɒntgəˈnɒgrəfɪ, etc.)
[f. ortho- + roentgenography s.v. roentgen-.]
A technique for producing radiographs showing the exact sizes of organs or bones by using a narrow beam of X rays perpendicular to the plate or film.
There are other pronuncs. of this word and its derivs. analogous to those of roentgenography, -gram, etc.
1946W. T. Green et al. in Jrnl. Bone & Joint Surg. XLIV. 60 In a study of growth by the Harvard Infantile Paralysis Commission, it was found necessary to develop a method of measuring the lower extremities which would meet the following requirements... The method to be described has been designated ‘orthoroentgenography’. 1972M. O. Tachdjian Pediatric Orthopedics II. vii. 1486/2 The advantages of orthoroentgenography are that the true length of each bone can be measured, because magnification due to divergence of rays is eliminated by directing only perpendicular rays at the ends of the long bones.
Hence orthoˈroentgenogram, a radiograph produced by orthoroentgenography; ˌorthoroentgenoˈgraphic a., (done by means) of orthoroentgenography.
1946Jrnl. Bone & Joint Surg. XLIV. 63 The true length of each bone can be measured directly from orthoroentgenograms without computation. Ibid. 65 Orthoroentgenographic measurement of a dissected adult femur, 45·7 centimeters long, gave a length of 45·5 centimeters. 1951L. A. W. Kemp Students' Radiol. Math. v. 62 In the second orthoroentgenographic technique, a narrow slit..in a sheet of metal opaque to X-rays, is arranged to be vertically below the source S, so that at any instant there is only a narrow line of X-rays..across the patient, the plane containing the rays being vertical. 1972M. O. Tachdjian Pediatric Orthopedics II. vii. 1486/1 The technique [sc. teleoroentgenography] is not satisfactory for serial mensurations and bone detail is much less than that seen on spot orthoroentgenograms. |