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Article type: Cover
1999 Volume 55 Issue 11 Pages
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Article type: Index
1999 Volume 55 Issue 11 Pages
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Article type: Index
1999 Volume 55 Issue 11 Pages
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[in Japanese]
Article type: Article
1999 Volume 55 Issue 11 Pages
I-
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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1999 Volume 55 Issue 11 Pages
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1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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1999 Volume 55 Issue 11 Pages
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HISASHI MAEKOSHI
Article type: Article
1999 Volume 55 Issue 11 Pages
1061-1065
Published: November 20, 1999
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KAZUO MIYASAKA
Article type: Article
1999 Volume 55 Issue 11 Pages
1066-1070
Published: November 20, 1999
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NOBUYUKI FUJITA
Article type: Article
1999 Volume 55 Issue 11 Pages
1071-1080
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SHIGERU MIYAZAKI
Article type: Article
1999 Volume 55 Issue 11 Pages
1081-1092
Published: November 20, 1999
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TAKEYUKI HASHIMOTO
Article type: Article
1999 Volume 55 Issue 11 Pages
1093-1096
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SHUN KABATA
Article type: Article
1999 Volume 55 Issue 11 Pages
1097-1100
Published: November 20, 1999
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NOBUHIRO ODA, SHIGEHIKO KATSURAGAWA, KUNIO DOI, KEIJI FUJIMOTO, SEIICH ...
Article type: Article
1999 Volume 55 Issue 11 Pages
1101-1108
Published: November 20, 1999
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A temporal subtraction image obtained by subtraction of a previous image from a current one can enhance interval change on chest images. In this study, we compared the visibility of simulated lung nodules on CR images with and without temporal subtraction. Chest phantom images without and with simulated nodules were obtained as previous and current images, respectively, by a CR system. Then, subtraction images were produced with an iterative image warping technique. Twelve simulated nodules were attached on various locations of the chest phantom. The diameter of nodules having a CT number of 47 ranged from 3 mm to 10 mm. Seven radiologists subjectively evaluated the visibility of simulated nodules on CR images with and without temporal subtraction using a three-point rating scale (0: invisible, +1: questionable, +2:visible). The minimum diameter of simulated nodules visible at a frequency greater than 50% was 4 mm on the CR images with temporal subtraction and 6 mm on those without. Our results indicated that the subtraction images clearly improved the visibility of simulated nodules.
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SHOICHI KATSUTA, KOUZOU HANAI, TAKEO KUNII, HARUKI KIMURA, WATARU IMAB ...
Article type: Article
1999 Volume 55 Issue 11 Pages
1109-1114
Published: November 20, 1999
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The section sensitivity profile (SSP) is adequate to express the properties of helical CT images. Although SSP measurement has been performed only at the center of the imaging field, we applied it to off-center positions using a metal bead and controlled tracking technique. The experimental results indicated that SSP curves vary in the imaging field according to the relative position of the x-ray focus. The results were in agreement with computer simulations.
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SACHIKO GOTO, YOSHIHARU AZUMA, TOSHINORI MARUYAMA, YOSHITADA NAKAGIRI, ...
Article type: Article
1999 Volume 55 Issue 11 Pages
1115-1121
Published: November 20, 1999
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Film graininess can be measured by providing air spaces between the screen and film in the screen-film system. In this study, the necessary air spaces were investigated to measure mammographic film graininess by using a mammography unit at the low tube voltage of 28 kV. Wiener spectra were measured with the screen held 1, 3, 6, 9,15, 21, and 30 mm from the film at densities of 0.8 and 1.3. Konica New CM film with a Konica M-150 screen was employed in this investigation. Results showed that Wiener spectral values were almost constant at densities of 0.8 and 1.3 when the air spaces were 9 mm or more. That is, it was considered that film graininess was evaluated independently by blurring quantum mottle, and 15 mm air spaces were used to provide a safety margin. Furthermore, film graininess of three mammographic films, Fuji UM-MA HC (with a Fuji UM MAMMO Fine screen), Kodak Min-R 2000 (with a Kodak Min-R 2000 screen), and Kodak Min-R M(with a Kodak Min-R Medium screen)were measured with 15 mm air spaces. Min-R 2000 film had the lowest Wiener spectral values for film graininess at low spatial frequencies.
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HIROKO NISHIDE, TOMOKO SHIMONO, KAORI MURATA, SHIGERU KASAHARA, YOSHIT ...
Article type: Article
1999 Volume 55 Issue 11 Pages
1122-1130
Published: November 20, 1999
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A questionnaire was administered to 100 patients to survey their response to gowns worn at the time of chest x-ray examinations. Over 60% of respondents would have preferred to have undergone the examination with their clothes on. They were also concerned about the ease of dressing and undressing, and clean-liness. To create a suitable gown, we evaluated the x-ray absorption and softness of the primary hand of various fabrics. Accordingly, we determined that synthetic fabrics had less absorption than cotton or wool fabrics. In addition, synthetic fabrics that incorporated polyurethane were comfortable to wear, and thus agreeable to patients in terms of feel and ease of movement. We employed a trial manufactured gown using such a fabric with patients, and it was found that patients considered the gown comfortable to wear.
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MITSUHIRO MATSUMOTO, TETSUYA OHSHIMA, MASANORI KOMI, SHOJI TANI, KEIJI ...
Article type: Article
1999 Volume 55 Issue 11 Pages
1131-1138
Published: November 20, 1999
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This article reports the results of an April 1998 survey conducted among radiotherapy technologists in the Kinki region in order to investigate their working conditions at that time. According to the results, 26.6% of the radiotherapy technologists were working exclusively with a specific modality, 37% worked concurrently with two modalities, and 36.4% worked with all modalities on shift rotation. Many of the respondents reported working alone. The number of radiotherapy technologists working exclusively with a specific modality increased in proportion to the number of beds, while that of radiotherapy technologists working concurrently with other modalities decreased in inverse proportion to the number of beds, and that of radiotherapy technologists on shift rotation remained at a constant level. Most of the radiotherapy technologists started work between 8:30 and 9:00 and finished at 17:00. Overtime work averaged one hour.
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
1139-1140
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
1141-1142
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
1143-1144
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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Article type: Appendix
1999 Volume 55 Issue 11 Pages
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Article type: Cover
1999 Volume 55 Issue 11 Pages
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