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Volume 16 (1976)
- Issue 3 Pages 189-
- Issue 2 Pages 63-
- Issue 1 Pages 1-
Volume 16, Issue 2
Displaying 1-8 of 8 articles from this issue
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Yousuke SUZUKI, Tatsuya SHIMANO1976 Volume 16 Issue 2 Pages 63-72
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSThe effective atomic number of the teeth was estimated by calculation and roentgenphotometry.
In this calculation the data about the composition of the teeth was obtained from the papers by Zipkin, Lazzari, Brudevold, Leichester, Long, Trautz, Weidmann and Eastoe.
And a few corrections of the data were made in order to estimate the living composition of the teeth.
In roentgen-photometry, for the purpose of obtaining the linear attenuation coefficient of the teeth, step wedges of teeth were made by a diamond-cutter, and were placed on a film together with a step wedge of aluminium.
Roentgenograms of those step wedges were taken at kilovoltages of 41 and the film densities measured by a micro photometer were converted into attenuation curves of film exposure
The linear attenuation coefficients of the teeth were determined comparing with the attenuation curve by aluminium. The density of the teeth was measured, too, and Allen's formula was adopted to obtain the effective atomic number.
The calculated and experimental results were as follows:
(1) The effective atomic number of enamel was 15.3±0.3 in calculation and 15.6±0.8 in experiment.
(2) The effective atomic number of dentine was 13.4±0.8 in calculation and 13.7±0.8 in experiment.View full abstractDownload PDF (1295K) -
Masao IIKUBO, Shigemitsu SHIRANE, Kazuo MARUHASHI1976 Volume 16 Issue 2 Pages 73-83
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSZonography is one of tomography with very narrow exposure angle from 0°to 20°, while conventional tomography which has widely applied for roentgen diagnosis in dento-maxilo-facial region is ordinarily used about 30°to 60°exposure angle.
The latter has great benefit to detect diseases occurred in craniofacial region as cross sectional image.
However, abnormal changes in detailed structures are often hidden by severe blurring shadow arising from dense structures outside the tomographic plane.
The puropose of present study is to analyze the image formation of zonogram which can be aid above mentioned fault of tomography continuously to the former report.
Authors attempted to combined several zonographies with different exposure angles and to exposed on a film for improving the image quality of conventional zonography.
We called this special technique “Combination Zonography” to compare with conventional zonography.
The results from our study were as follows.
1. Combination zonography has characteristic blurring effect differed from neither conventional zonography nor tomography.
2. The image quality is extremely good because of its effective blurring compared with conventional zonography.
3. The best zonographic combination angle is experimentally 5°+10°+15°three revolutions.
4. Combination zonography may not get only true cross sectional image like conventional tomography, but the former is much better both on contrast and sharpness than the latter.View full abstractDownload PDF (15904K) -
Takenori NOIKURA, Shigemitsu SHIRANE, Hiroshi OSADA, Ryuji NAGAYAMA, K ...1976 Volume 16 Issue 2 Pages 84-88
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSThe authors reported the case of a 15 year old girl with hemangioma associated with phleboliths which were scattered throughout, involving tongue, buccal mucosa, and bilateral submandibular regions.
The roentogenographic examination could detect multiple radiopacities occupying widespread regions, which was difficult with inspection. Their radioopacities were different respectively; some of them revealed apparent lamination, and/or central dark areas.
A conservative success has been obtained with, radiation therapy by 6 meV linac electron beam, the packing method and the administration of a sclerosing agent (Sodium morrhuate).View full abstractDownload PDF (1179K) -
[in Japanese]1976 Volume 16 Issue 2 Pages 89-93
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (578K) -
[in Japanese], [in Japanese]1976 Volume 16 Issue 2 Pages 94-97
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
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[in Japanese], [in Japanese], [in Japanese]1976 Volume 16 Issue 2 Pages 98-99
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
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1976 Volume 16 Issue 2 Pages 117-180
Published: August 30, 1976
Released on J-STAGE: June 03, 2011
JOURNAL FREE ACCESSDownload PDF (7127K) -
1976 Volume 16 Issue 2 Pages 181-182
Published: August 30, 1976
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (145K)
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