| 单词 |
orthopantomography |
| 释义 |
orthopantomography Med.|ˌɔːθəʊpæntəˈmɒgrəfɪ|
[f. ortho- + pantomography.]
A modification of pantomography in which the X-rays are made to be more nearly normal to the line of the jaws, so that a radiograph can be obtained showing all the teeth and adjacent tissue in a straight line.
1959Y. V. Paatero in Acta Radiologica LI. 449 Since stereoscopy has been successfully adapted to ordinary pantomography..theoretical and experimental investigations into the possibility of obtaining equally good stereoscopic effects with the new pantomographic method ‘orthoradial pantomography’ (or orthopantomography for short), were considered to be justified. 1961Oral Surgery XIV. 947 (heading) Pantomography and orthopantomography. 1968Brit. Jrnl. Radiol. XLI. 872/2 They reported that during orthopantomography the exposure at the eccentric axis was 1·5 R and at the skin surface it varied from 0·3 R to 0·9 R.
Hence orthopanˈtomogram, a radiograph obtained by orthopantomography; orthopanˈtomograph, an instrument for performing orthopantomography.
1959Y. V. Paatero in Annales Medicinae Internae Fenniae xlviii. Suppl. 28. 223 As no ‘orthopantomograph’ suitable for clinical use was yet available, the accompanying pictures were taken of a dry skull with a hand-rotated miniature apparatus. 1959― in Acta Radiologica LI. 452 The jaws appear flat in orthopantomograms and not curved as in ordinary pantomograms. 1967L. M. Ennis et al. Dental Roentgenol. (ed. 6) x. 283 In operation of the Orthopantomograph, the patient remains stationary while the x-ray tubehead circulates from his right side around behind his neck to the left side, while the film rotates about an axis and at the same time, revolves from the left side of the patient's face, around the front and to the right side of the face. 1971Brit. Dental Jrnl. CXXX. 429/2 There are two image layers in the orthopantomograph, one on either side of the rotational centre, the object further from the film presenting reversed images. Ibid. 433/2 This delicate spur of bone is not visible on the orthopantomogram. |
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