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38 巻, 2 号
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小寺 吉衛1998 年 38 巻 2 号 p. 85-86
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (270K) -
中村 卓, 泉 雅浩1998 年 38 巻 2 号 p. 87-91
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーMagnetic resonance (MR) has been widely applied to the medicine, and the dogma to the prosperity, of MR in diagnostic radiology has been verified in the various clinical fields. The temporomandibular joint disease is indeed one of such prosperous fields of MR. However, diagnostic usefulness of MR is remained to be substantiated in many aspects of the dento-maxillofacial region. Here, we introduce such hidden aspects of MR in the diagnostic radiology, with placing special focus on the salivary and lacrimal glands, mandibular bone marrow, and peripheral blood vessels of the face.抄録全体を表示PDF形式でダウンロード (816K) -
第2報:FLASH法におけるFlip Angleの検討阪本 真弥, 日向野 修一, 高橋 昭喜, 栗原 紀子, 笹野 高嗣1998 年 38 巻 2 号 p. 92-99
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーIn our previous study on MR imaging of the temporomandibular joint (TMJ), fast low angle shot (FLASH) showed the highest image contrast between disc and surrounding TMJ tissues compared with those of 4 other sequences (i, e., fast imaging with steady precession (FISP), conventional T1-weighted spin echo (SE) and fast spin echo (FSE, TR/TE/ETL: 1100/12/3, 3000/15/7)). Furthermore, FLASH also received a high score on visual evaluation including the position and contour of the disc, and the border between the disc and surrounding tissues. Therefore, we concluded that FLASH was the most suitable sequence for evaluating the TMJ disc. However, the image contrast and signal intensity on MR imaging with gradient echo pulse sequence are affected by flip angle. Consequently, in this report, to find the most suitable flip angle for MR scanning of the TMJ using a FLASH sequence (TR/TE: 450/11), ten TMJs of 5 volunteers were experimentally imaged with various flip angles from 10 degrees to 70 degrees at an interval of 10 degrees between 10 to 70. The image contrast and contrast-to-noise ratio (CNR)between the disc and surrounding tissues were compared. In addition, signal-to-noise ratio (SNR) of phantoms was also calculated using the same imaging parameters. Visual evaluation including position and contour of the disc, and the border between the disc and surrounding tissues, was also perf omed by 4 radiologists. As the flip angle increased, imaging contrast decreased while SNR increased. Images with flip angles between 30 and 60 degrees demonstrated high CNR. On visual evaluation, images using flip angles between 30 and 50 degrees received high scores. In conclusion, FLASH sequence with a flip angle between 30 and 50 degrees was considered most suitable for evaluating the TMJ disc based on the results of visual assessment and analysis of three major components of image diagnostic quality: image contrast, CNR and SNR.抄録全体を表示PDF形式でダウンロード (3828K) -
湯浅 雅夫, 小林 馨, 五十嵐 千浪, 今中 正浩, 山本 昭1998 年 38 巻 2 号 p. 100-104
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーThis investigation evaluated the quality of coronal magnetic resonance images of the TMJ by altering the direction of scanning. Materials and methods: Coronal MR images of 158 TMJs were obtained at 0.2 Tesla (MRP-20 HITACHI MEDICO, Tokyo). MR imaging was performed on two coronal planes. The first plane was parallel to the posterior surface of the ramus of 81 TMJs. The second plane was perpendicular to the posterior slope of the eminence of 77 TMJs. Both coronas planes were parallel to the long axis of the condyle. Special attention was directed toward the clarity of the disc relative to the osseous anatomy. Results: Sixty-seven of 77 (87%) discs were well-defined using planes perpendicular to the posterior slope of the eminence. Using the other planes, 28 of 81 (35%) disc were well-defined. Conclusion: Coronal MR images obtained perpendicular to the posterior slope of the eminence demonstrated the anatomy of the disc better than coronal images obtained parallel to the posterior surface of the ramus.抄録全体を表示PDF形式でダウンロード (2045K) -
下顎窩の計測値による比較について本田 和也, 小林 馨, 上野 正博, 五十嵐 千浪, 湯浅 雅夫, 今中 正浩, 荒木 正夫, 岩井 一男, 橋本 光二, 山本 昭, 篠 ...1998 年 38 巻 2 号 p. 105-111
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーThis study investigated morphological changes of the mandibular fossa in TMJ articular disc perforation. Two hundred internal derangements of the TMJ, consisting of 100 perforated cases and 100 non-perforated cases were studied. Morphological analysis was performed using TMJ tomographic images obtained from these subjects. Measurements of the mandibular fossa were performed with serial TMJ lateral tomography
.The results were as follows: Morphological measurements of the mandibular fossa revealed significantly smaller values in the vertical diameter, front length diameter, posterior and back length diameter in perforated cases compared with non-perforated cases by Student's t-test (P<0.01). In conclusion, these results suggest that perforation of the TMJ articular disc leads to degenerative change in the mandibular fossa.抄録全体を表示PDF形式でダウンロード (2605K) -
和光 衛, 北川 博美, 原田 卓哉, 山田 正幸, 黒柳 錦也, 廣瀬 聡, 山本 貴和子, 齊藤 力1998 年 38 巻 2 号 p. 112-120
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーWe present three cases of submerged teeth with previous restoration involving the left first molar in the mandible, the left and right second primary molars in the mandible. Additionally, etiological factors and terms including “submersion”, “reimpaction”, “secondary retention” and others referring to abnormally erupted teeth are discussed since the terminology does not seem to be consistent. The first case was a 27-years-old male. He came to Tokyo Dental College because his left lower first molar, which had been filled occlusally during his junior high school days, seemed to have disappeared. Radiographic and clinical examinations revealed that the tooth was completely covered by oral mucosa; it had been filled. The second case was a 16-years-old girl. She was referred to our college by an orthodontist because her left lower second primary molar, which had been filled occlusally, seemed to have partially disappeared. The third case was a 9-years-old boy whose lower second primary molar had previously undergone restoration. The main radiographic and clinical findings were similar as the second case. Teeth adjacent to the submerged tooth tended to tilt. There were no contributing hereditary factors found in any case.抄録全体を表示PDF形式でダウンロード (6189K) -
佐藤 太吾, 代居 敬, 五十嵐 史征, 勝山 直彦, 内田 稔, 井上 健和1998 年 38 巻 2 号 p. 122-123
発行日: 1998/06/30
公開日: 2011/09/05
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竹内 徹, 高橋 章, 工藤 隆治, 久保 典子, 藤澤 健司1998 年 38 巻 2 号 p. 124-125
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (2239K) -
内田 啓一, 藤木 知一, 奥田 大造, 下島 あずさ, 木村 晃大, 深澤 常克, 長内 剛, 和田 卓郎1998 年 38 巻 2 号 p. 126-127
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (2114K) -
1998 年 38 巻 2 号 p. 128-145
発行日: 1998/06/30
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (3008K)
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