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原稿種別: 表紙
2003 年 59 巻 8 号 p.
Cover27-
発行日: 2003/08/20
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原稿種別: 目次
2003 年 59 巻 8 号 p.
Toc21-
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原稿種別: 目次
2003 年 59 巻 8 号 p.
Toc22-
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小林 吉衛
原稿種別: 本文
2003 年 59 巻 8 号 p.
I-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
II-IV
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
IV-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
V-VI
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
VII-IX
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
X-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
X-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
X-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
XI-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
XII-
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富樫 かおり
原稿種別: 本文
2003 年 59 巻 8 号 p.
895-903
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室伊 三男
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2003 年 59 巻 8 号 p.
904-912
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山下 一也
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2003 年 59 巻 8 号 p.
913-920
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福田 篤志, 北林 啓太郎, 岩舘 美晴, 山口 一郎
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2003 年 59 巻 8 号 p.
921-926
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丸橋 一夫, 隅田 博臣, 角田 明, 舟橋 逸雄, 遠藤 敦, 三島 章, 小寺 吉衞, 早川 吉彦, 大塚 昭義
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2003 年 59 巻 8 号 p.
927-931
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上總 中童
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2003 年 59 巻 8 号 p.
932-934
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中江 保夫, 小田 雅彦, 源 貴裕
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2003 年 59 巻 8 号 p.
935-943
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Medical irradiation dosage has been increasing with the development of new radiological equipment and new techniques like interventional radiology. It is fair to say that patient dose has been increased as a result of the development of multi-slice CT. A number of studies on the irradiation dose of CT have been reported, and the computed tomography dose index (CTDI) is now used as a general means of determining CT dose. However, patient dose distribution in the body varies with the patient's constitution, bowel gas in the body, and conditions of exposure. In this study, patient dose was analyzed from the viewpoint of dose distribution. using a radiation treatment-planning computer. Percent depth dose (PDD) and the off-center ratio (OCR) of the CT beam are needed to calculate dose distribution by the planning computer. Therefore, X-ray CT data were measured with various apparatuses, and beam data were sent to the planning computer. Measurement and simulation doses in the elliptical phantom (Mix-Dp : water equivalent material) were collated, and the CT irradiation dose was determined for patient dose simulation. The rotational radiation treatment technique was used to obtain the patient dose distribution of CT, and patient dose was evaluated through simulation of the dose distribution. CT images of the thorax were sent to the planning computer and simulated. The result was that the patient dose distribution of the thorax was obtained for CT examination.
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近藤 裕二
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2003 年 59 巻 8 号 p.
944-950
発行日: 2003/08/20
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Bone mineral density (BMD) increases though infancy and adolescence, reaching a maximum at 20-30 years of age. Thereafter, BMD gradually decreases with age in both sexes. The image contrast of radiographs of bones varies with the change in BMD owing to the changes in the X-ray absorption of bone. The image contrast of bone generally is higher in the young adult than in the older adult. To examine the relation between BMD and image visibility, we carried out the following experiments. (1) We measured the image contrast of radiographs of a lumbar vertebra phantom in which BMD was equivalent to the average BMD for each developmental period. (2) We examined image visibility at various levels of imaging contrast using the Howlett chart. The results indicated that differences in BMD affect the image contrast of radiographs, and, consequently, image visibility. It was also found that image visibility in the young adult was higher than in the older adult. The findings showed that, in digital radiography of young adults with high BMD, X-ray exposure can be decreased according the ratio of improvement in image visibility.
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萬代 奈都子, 真田 茂, 上木 耕一郎, 舟迫 慎太郎, 都築 晋治, 松井 武司
原稿種別: 本文
2003 年 59 巻 8 号 p.
951-957
発行日: 2003/08/20
公開日: 2017/06/30
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The purpose of this study was to develop a screening technique for temporomandibular disorders (TMD) and assist dentists in objectively and evaluating pre/post-treatment status. Dynamic images of the temporomandibular joint (TMJ) from one healthy volunteer were obtained by digital fluoroscopy in the lateral view on both right and left sides. Outlines of the glenoid fossa and the condyle were extracted, respectively, by using sobel operator (7×7) thresholding and labeling. Morphological parameters in time-sequence, such as fossa ratio, area, and distance of the joint space, were then analyzed. There were no differences between manual and computer analysis in extracting the outline of the glenoid fossa and the condyle. Deformity of the outline of the glenoid fossa and the condyle was not identified in this subject. The fossa ratio was 0.30±0.01 on the right and 0.29±0.02 on the left. The area and distance of the joint space in the post-glenoid fossa were slightly larger than those in the articular eminence on both sides. These morphological parameters were useful for screening and pre- and post-treatment evaluation of TMD patients.
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金沢 勉, 岩崎 友也, 高橋 麻由, 柿沼 健一, 江塚 勇, 山田 治行
原稿種別: 本文
2003 年 59 巻 8 号 p.
958-964
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Although abducens nerve palsy is a relatively common disease, the abducens nerve has been almost impossible to identify, because it is one of the finest cranial nerves and runs three-dimensionally in the prepontine cistern. Three-dimensional constructive interference in steady state (3D-CISS) is helpful in visualizing fine structural elements in the central nervous system because of its higher spatial resolution and fewer artifacts from cerebrospinal fluid. In this study, we successfully visualized the abducens nerve using 3D-CISS. The procedures were as follows : first, Dorello's canal and the ponto-medullary sulcus were identified as visible, landmarks, and then the abducens nerve was followed to the root exit zone ; second, the gray scale of the original image was inverted to clearly visualize the cisternal course of the nerve and the neighboring small vessels ; and, finally, the entire cisternal course of the nerve was visualized in the same images in both oblique axial and oblique sagittal planes by a multi-planar reconstruction method. This reliable technique can be performed for the diagnosis of abducens nerve palsy.
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加藤 秀起
原稿種別: 本文
2003 年 59 巻 8 号 p.
965-975
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When computing the amount of leakage from a diagnostic X-ray room, the transmission data of X-ray beams through the shielding material, which are used in the computation, must agree with the conditions of use of the X-ray equipment. Even if the tube potential is the same, the energy spectrum of generated X-rays depends on conditions such as high voltage rectification and total filtration, and transmission through the shielding material, too, is subject to change. In this paper, we propose a new method of calculation, which uses transmission data of mono-energetic photon beams computed by means of a Monte Carlo simulation, for obtaining effective dose transmission data through the shielding material of an X-ray beam with spectral distribution. We also present effective dose transmission data of primary X-ray beams and 90°scattered X-ray beams through concrete and lead shields as determined by this method. This method, which can calculate the transmission data X-ray beams with any spectral distribution, is useful in evaluating the leakage dose of diagnostic X-ray facilities.
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能登 公也, 曽田 卓実, 越田 吉郎, 鈴木 昇一
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2003 年 59 巻 8 号 p.
976-983
発行日: 2003/08/20
公開日: 2017/06/30
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Radiation is controlled by the recent revision of the Enforcement Regulations of the Medical Service Law. Law No. 188 prescribes X-ray data for estimating effective dose in the controlled area of a medical facility. For X-ray data such as kerma in air, transmission data are based on NCRP. We compared various X-ray data, and NCRP and Simpkin were compared with law No. 188. Leakage effective doses in a general-purpose radiography room, fluoroscopy room, and X-ray CT room were calculated. All three calculations were below the dose limit for controlled areas, 1.3 mSv/3 months. In the general-purpose radiography room (including fluoroscopy), NCRP and Simpkin underestimated from 1/3 to 1/2 in comparison with law No. 188. In the X-ray CT room, NCRP and Simpkin showed understimates from 1/2 to 2/3 compared with law No. 188. There were no significant differences between law No. 188, NCRP, and Simpkin, but significant differences were found for individual numerical values. A need for the re-examination of basic data was suggested by the above findings.
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田中 利恵, 真田 茂, 小林 健, 鈴木 正行, 松井 武司, 井上 仁司
原稿種別: 本文
2003 年 59 巻 8 号 p.
984-992
発行日: 2003/08/20
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The flat-panel detector (FPD) has been introduced into clinical practice. A modified FPD, which has the ability to obtain dynamic chest radiographs, was introduced into our hospital, and clinical testing is ongoing. Both the inspiratory and expiratory phases have to be included in dynamic chest radiographs. The purpose of this study was to investigate the most appropriate chest radiography signal for observation of the respiratory process. We prepared ten protocol patterns that differed in terms of respiratory phase at X-ray exposure, exposure duration, and signal multiplicity. We also performed preliminary experiments. and administered several questionnaires to ten volunteers. The volunteers breathed according to vocal and visual signals, and their respiratory waves were recorded by spirometer. The most appropriate protocol was similar to the method used for conventional chest radiography.
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
993-995
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
996-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
997-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
998-1000
発行日: 2003/08/20
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
1001-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
1002-
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原稿種別: 付録等
2003 年 59 巻 8 号 p.
App21-
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原稿種別: 表紙
2003 年 59 巻 8 号 p.
Cover28-
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