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39 巻, 2 号
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佐々木 武仁1999 年 39 巻 2 号 p. 91-93
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (364K) -
歯科放射線科の立場から谷本 啓二1999 年 39 巻 2 号 p. 94-105
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーIn recent years, adavances of rehabilitation technique for dysphagia has made it common to treat dysphagic patients in Japan. Since dentists will be frequently called upon to make home visits to patients who may not be able to walk or even stand up, dentists are in a position to screen many homebound patients for dysphagia. In cases where dysphagia is suspected, the dentist can consult with a dental hospital to make a thorough examination. The treatment options for dysphagia include rehabilitation for eating, surgery on the oropharynx and larynx, feeding via a nasal tube, and gastrostomy. Of all the problems associated with dysphagia, aspiration of food is the most important because it can lead to aspiration pneumonia. This is significant as pneumonia is the leading 4 th cause of death in the elderly in Japan. In determining a treatment strategy for dysphagic patients, extensive examination is necessary to understand not only the mechanism of aspiration but also the underlying etiology of the problem. Videofluorography allows the physician to examine the rapid motions involved in the act of swallowing. This technique will allow oral and maxillofacial radiologists to properly examine dysphagic patients. This article describes the equipment and procedure necessary to perform a videofluorographic examination of dysphagic patients. When aspiration is suspected, the recommended contrast media are iohexol or iopamidol, both of which are non-ionic low osmolar contrast media. High osmolar contrast media, such as amidotrizoic acid, are reportedly harmful to the lung when aspirated. For the examination of the act of swallowing foods containing contrast medium should be used, such as barium cookies or iopamidol-containing jelly. Dose measurement is also discussed in this article.抄録全体を表示PDF形式でダウンロード (7718K) -
五十嵐 千浪, 小林 馨, 湯浅 雅夫, 今中 正浩, 山本 昭1999 年 39 巻 2 号 p. 106-112
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーWe evaluated here, the magnetic resonance (MR) image findings of anterior disc displacement without reduction in asymptomatic patients with the mouth closed as well as opened.
Twenty-seven asymptomatic joints and 46 joints with pain, limited to the mouth-opening move-ment were examined by MR imaging at 0.3 Tesla (MRP-7000 HITACHI MEDICAL). Appraisal was made of the disc configuration, the degree of anterior disc displacement, the condylar position with the mouth closed and the disc and condylar positions with mouth maximally opened in the asymptomatic side demonstrating anterior disc displacement without reduction.
No significant relationship was found between the asymptomatic sides and the symptomatic sides conserning the degree of disc displacement or the position of the condyle with the mouth closed. When the mouth was maximally opened, the condyle was located more anteriorly or closer to the apex of the articular eminence, and the posterior band was located in a position more anterior or superior to the articular surface of the condylar head in the asymptomatic sides than in the symptomatic sides.
MR image findings showed that with the mouth maximally opened, the disc was located more anteriorly or superiorly and the condyle closer to the apex of the articular eminence or more anteriorly in the asymptomatic sides than in the symptomatic sides.抄録全体を表示PDF形式でダウンロード (4289K) -
矢崎 史郎, 大坊 元二1999 年 39 巻 2 号 p. 113-121
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーIn recent years, multimode panoramic radiography has had various functions, such as the auto exposure function, auto focus function (auto function), TMJ radiography and tomogram radiography functions. The Purpose of this study was to estimate the effective dose for patients in each mode of the new multimode panoramic radiography. (J. MORITA MFG. CORP. Dental Panorama X-ray Apparatus:Veraview Scope X 600) The absorbed doses in important organs involved in the causation of stochastic effects were measured by a thermoluminescent dosimeter using RANDO phantom.The effective doses were calculated using modified tissue weighting factors recommended by theInternational Commission on Radiological Protection (ICRP) in 1990. The mean field size over skin in typical panoramic and tomographic examinations was about 3% and 0.4% of the total body surface area of 15000cm2. Assuming that the incidence of skin cancer is proportional to the area of skin exposed to ionizing radiation, the tissue weighting factor of skin can be estimated to be about 0.0003 and 0.00004. The estimate in effective dose was lower (5.3μSv) in the panoramic auto function mode (an average exposure condition of 69kV 7mA) than that (6.5-13.8μSv) in the linear tomogram modes. Since the linear tomogram mode requires a scout view, such as standard panoramic radiography, the dose in the linear tomogram mode becomes higher than other modes. A percentage of gonad doses in effective doses was negligible.抄録全体を表示PDF形式でダウンロード (1199K) -
新井 嘉則, 岩井 一男, 橋本 光二, 江島 堅一郎, 本田 和也, 澤田 久仁彦, 荒木 正夫, 大木 亨, 里見 れい子, 篠田 宏司1999 年 39 巻 2 号 p. 122-127
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーObjectives: To evaluate a digital rotational panoramic radiography system with a full frame transfer charge-coupled device in terms of skin dose and image quality.
Materials and Methods: The J. Morita Corporation (Kyoto, Japan) developed a new digital rotational panoramic radiography system called the veraview epocs x-550. We compared a prototype of this new machine to a conventionaol rotational panoramic radiography system (the veraview x-500, J. Morita Co.). Skin dose was measured with a Rand phantom with attached TLDs and skin dose of each system were then compared. In order to compare image quality, six oral and maxillofacial radiologists evaluated the image quality of anatomical radiographic landmarks on both the digital and film images. The digital images were displayed on a CRT and the film images were observed on a viewing box.
Results: The skin/dose of the digital system was about half that of the conventional system but the image quality of the conventional system was better than that of the digital system although this difference was not statistically significant (Student's t-test, p>0.05).
Conclusion: The skin dose of the new digital rotational panoramic radiography system is about half that of the conventional film system and the quality of the digital images is almost as good as that of the film images. This will allow a reduction in radiation doses in future clinical practice.抄録全体を表示PDF形式でダウンロード (3580K) -
奥村 信次, 森亜 紀子, 大崎 千秋, 内藤 宗孝, 川俣 明敏, 塩島 勝, 有地 榮一郎1999 年 39 巻 2 号 p. 128-134
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーThe purpose of this report was to propose a method to determine the objective planes of crosssectional tomography in relation to the dental arch using a panoramic machine with a function of linear tomography. This method was based on the means of evaluating the exposure angles in linear tomography, which were described in the report by the International Commission on Radiation Units and Measurements (ICRU). A special device consisting of five thin slits measuring 0.1mm in width was designed for this purpose. This device was set at the position of the primary slit of the examined machine. The thin slits were arranged in radiated position along the X-ray beam from the primary slit. The film cassettes for evaluation were set on 3mm-thickness styrene form plates in an exposed area using a tripod. The objective planes were determined by connecting the points, which corresponded to the apices of the triangles facing each other on the exposed film. The objective planes were determined in 16 areas from the central incisor to the third molar on both the left and right sides. The measured planes corresponded closely with the simulated planes.抄録全体を表示PDF形式でダウンロード (5980K) -
荒木 正夫, 島田 英治, 桑島 永治, 橋本 光二, 篠田 宏司, 小宮山 一雄1999 年 39 巻 2 号 p. 136-137
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (1782K) -
1999 年 39 巻 2 号 p. 138-142
発行日: 1999/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (754K)
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