文献一覧: 公益社団法人日本放射線技術学会 (出版者)

1 0 0 0 OA 冠動脈CTA検査のための至適造影剤注入法の検討:テストボーラスパラメータと被検者の性差,BSAを用いた注入ヨード量調整法

著者: 秋山宣行中村幸弘
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.65, no.8, pp.1073-1080, 2009-08-20 (Released:2009-09-01)
参考文献数: 12
被引用文献数: 3 5

The purpose of this study was to correlate test bolus (TB) parameters and patient information and cardiac function with main bolus (MB) contrast density for 64-slice computed tomography, and to evaluate MB contrast density on a fixed injection rate, in comparison with an injection rate adjusted with TB parameters and patient information. A total of 256 patients underwent coronary CT angiography. In 126 patients (group 1), contrast material was administered at a flow rate of 4 ml/sec. The peak enhancement, the time needed to reach the peak of the TB and cardiac function of the MB were calculated for each patient in this group. The dependency of MB contrast attenuation on these parameters was evaluated. Significant correlations were obtained between the peak density of the TB and the patient’s body surface area (BSA) with the enhancement of MB. Furthermore, females showed a higher peak enhancement of MB than males. In view of the results of group 1, in the other 130 patients (group 2) injection protocols were computed by using regression analysis of each patient’s attenuation response to a TB and patient sex and BSA. Compared with group 1, the variations of MB contrast density of group 2 were reduced. Optimized contrast injection protocols are useful to reduce variations of MB contrast density, by taking these TB parameters and patient sex and BSA into account.

2022-02-26 17:39:56
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1 0 0 0 OA 脊髄・脳幹部の拡散強調画像におけるPSIF法,SPLICE法の有用性

著者: 打越将人植田隆史楫靖辻昭夫和田昭彦今岡いずみ松尾導昌丸山克也岡本淳滝沢修
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.57, no.6, pp.639-644, 2001-06-20 (Released:2017-06-30)
参考文献数: 13

Studies have shown that diffusion MR imaging is a reliable method for the diagnosis of central nervous system diseases, especially acute cerebral infarction. Although echo planar imaging (EPI) is a promising tool for that purpose, it is vulnerable to susceptibility artifacts that are responsible for image distortion or signal loss. Our purpose in this study was to evaluate the usefulness of diffusion MR imaging with PSIF (reversed fast imaging SSFP) and split acquisition of fast-spin-echo signals for diffusion imaging (SPLICE) in the central nervous system (CNS). First, PSIF and SPLICE were applied to the phantoms. Each phantom, including acetone, acetic acid, and water, was analyzed for ADC based on SPLICE and for diffusion related coefficient (DRC) based on PSIF. The ADCs based on SPLICE were 4.36±0.89 * 10^<-3> mm^2/sec, 1.25±0.04 * 10^<-3> mm^2/sec, and 2.35±0.04 * 10^<-3> mm^2/sec, and the DRCs based on PSIF were 0.353±0.25, 0.178±0.07, and 0.273±0.018 for acetone, acetic acid, and water, respectively. These calculated ADCs based on SPLICE were well correlated with known diffusion coefficients, showing a correlation coefficient of 0.995. Second, PSIF and SPLICE were applied to the CNS. The advantage of PSIF and SPLICE was that susceptibility artifacts were reduced in the images of spinal cord and brain stem. PSIF was especially useful for diffusion MR imaging in the spinal cord. The disadvantage of SPLICE was the decreased SN ratio. We conclude that PSIF or SPLICE may be helpful when EPI diffusion MR imaging is insufficient.

2022-02-23 10:57:44
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1 0 0 0 OA CT検査におけるガントリ傾斜角度の影響

著者: 白石順二花岡信子宇都宮あかね上田容子津田和良
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.53, no.1, pp.19-24, 1997-01-20 (Released:2017-06-29)
参考文献数: 4
被引用文献数: 2 1

The relationship between gantry angle and the interval length of the scanning plane in computed tomography(CT)was studied with a simple geometrical calculation and the evaluation of clinical images obtained with a human phantom. The change in patient dose was also evaluated under various conditions of gantry angle. When the same table feeding distance was used, it was theoretically and experimentally demonstrated that the interval length of the scanning plane was significantly decreased as the gantry angle increased(e.g.about 10% at twenty-five degrees). Integrated patient dose during the sequence could be changed by various combinations of gantry angle and table feeding distance, and was decreased by setting an optimal interval length of scanning plane according to the gantry angle. We concluded that gantry angle had obvious effects on the interval length of the scanning plane and patient dose, and the new method of increasing the table feeding distance according to the gantry angle might be useful for the improvement of image reproduction and the reduction of patient dose.

2022-02-18 22:33:25
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1 0 0 0 OA Computed tomography におけるcalibration field of view やdisplay field of view が及ぼす金属アーチファクト低減効果の影響

著者: 坪井邦仁福永正明山本浩之
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.72, no.12, pp.1237-1244, 2016 (Released:2016-12-20)
参考文献数: 17
被引用文献数: 3 1

Purpose: The purpose of this study was to investigate the effects of the metal artifact reduction using single energy metal artifact reduction (SEMAR) with a prosthetic hip joint in different field of view (FOV). Methods: A prosthetic hip joint was arranged at the center of the phantom. The phantom images were scanned by changing calibrated-FOV (C-FOV) of 240, 320, 400, and 500 mm. Those images were reconstructed by changing the display-FOV (D-FOV) of 120, 180, 240, and 320 mm. The metal artifact reduction with the SEMAR was evaluated by calculating the artifact index (AI) and its decrease ratio. Results: The AI of C-FOV (500 mm) and D-FOV (120, 180, 240, or 320 mm) were 15.8, 15.8, 15.7, and 14.4 with SEMAR. For changed C-FOV, the AI of C-FOV (240 mm) was significantly higher than any other C-FOVs. The AI of C-FOV (240 mm) was 29.8–30.0 and that of the other C-FOV were 12.4–15.8 with SEMAR. In addition, the decrease ratio of AI was 52.2–54.1% for C-FOV (240 mm) and 58.9–73.2% for the other C-FOVs. Conclusion: Although the SEMAR decreased the metal artifact, the effect of reducing the metal artifact was affected by C-FOV.

2022-02-14 20:47:45
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1 0 0 0 OA 自動車産業への放射線利用(トピックス)

著者: 山本匡吾
出版者: 公益社団法人日本放射線技術学会
雑誌: 計測分科会誌 (ISSN:13453238)
巻号頁・発行日: vol.16, no.2, pp.18-23, 2008 (Released:2017-09-22)

2022-02-02 15:42:30
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1 0 0 0 2.ボウタイフィルタについて

著者: 村松駿
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.77, no.1, pp.75-80, 2021 (Released:2021-01-20)
参考文献数: 34

2022-02-01 22:55:47
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1 0 0 0 OA 放射線技術学に関する用語集の日本語表記と意味記述に関する比較

著者: 谷川原綾子辻真太朗福田晋久西本尚樹小笠原克彦
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.72, no.3, pp.203-208, 2016 (Released:2016-03-20)
参考文献数: 14
被引用文献数: 2

Purpose: The purpose of this study is to investigate the differences in the notation of technical terms and their meanings among three terminologies in Japanese radiology-related societies. Materials and Methods: The three terminologies compared in this study were “radiological technology terminology” and its supplement published by the Japan Society of Radiological Technology, “medical physics terminology” published by the Japan Society of Medical Physics, and “electric radiation terminology” published by the Japan Radiological Society. Terms were entered into spreadsheets and classified into the following three categories: Japanese notation, English notation, and meanings. In the English notation, terms were matched to character strings in the three terminologies and were extracted and compared. The Japanese notations were compared among three terminologies, and the difference between the meanings of the two terminologies radiological technology terminology and electric radiation terminology were compared. Results and Discussion: There were a total of 14,982 terms in the three terminologies. In English character strings, 2,735 terms were matched to more than two terminologies, with 801 of these terms matched to all the three terminologies. Of those terms in English character strings matched to three terminologies, 752 matched to Japanese character strings. Of the terms in English character strings matched to two terminologies, 1,240 matched to Japanese character strings. With regard to the meanings category, eight terms had mismatched meanings between the two terminologies. For these terms, there were common concepts between two different meaning terms, and it was considered that the derived concepts were described based on domain.