巻号一覧
68 巻, 10 号
選択された号の論文の19件中1～19を表示しています
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巻頭言
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赤澤 博之2012 年 68 巻 10 号 p. i
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (321K)
原著
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山口 功, 石森 佳幸, 藤原 康博, 谷内田 拓也, 吉岡 千絵2012 年 68 巻 10 号 p. 1295-1306
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーThe purpose of this study was to verify the applicability of measurement of slice thickness of magnetic resonance imaging (MRI) by the delta method, and to discuss the measurement precision by the disk diameter and baseline setup of the slice profile of the delta method. The delta method used the phantom which put in the disk made of acrylic plastic. The delta method measured the full width at half maximum (FWHM) and the full width at tenth maximum (FWTM) from the slice profile of the disk signal. Evaluation of the measurement precision of the delta method by the disk diameter and baseline setup were verified by comparison of the FWHM and FWTM. In addition, evaluation of the applicability of the delta method was verified by comparison of the FWHM and FWTM using the wedge method. The baseline setup had the proper signal intensity of an average of 10 slices in the disk images. There were statistically significant difference in the FWHM between disk diameter of 10 mm and disk diameter of 30 mm and 5 mm. The FWHM of the disk diameter of 10 mm was smaller than the disk diameter of 30 mm and 5 mm. There was no statistically significant difference in the FWHM between the delta method and the wedge method. There is no difference in the effective slice thickness of the delta method and the wedge method. The delta method has an advantage in measurement of thin slice thickness.抄録全体を表示PDF形式でダウンロード (2195K) -
西原 貞光, 林 裕晃, 花光 宏樹, 森 美智子2012 年 68 巻 10 号 p. 1307-1313
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーCaused by the accident of nuclear power plants in the Fukushima at 2011, many radioisotopes (RI) were diffused to the environment. As a result, X-ray detectors were stained with RIs and black spots appeared on the medical images. Using the RI of 134Cs and 137Cs, black spots which appeared on the photostimulable phosphor plate (X-ray detector) were reproduced experimentally. The aim of this study is the following two points; firstly, to clarify the relationship between long-time irradiations of RI and fading effect, and secondly, to clarify the positional relationship between the RI sources and the X-ray detector based on irradiation times of RI. For the latter experiment, the samples were made by spraying water (containing the RI) in order to reproduce small point sources. Then, the sources were placed on the photostimulable phosphor plate or on the cassette, and corresponding images with different irradiation times were taken. The black spots could be reproduced with the condition, in which sources were directly adhered to the photostimulable phosphor plate. We observed the black spots when sources were placed on the cassette for one week. Based on the result, we summarized that the RI which are directly adhered on the photostimulable phosphor plate may produce the black spots.抄録全体を表示PDF形式でダウンロード (1401K)
ノート
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谷 祐児, 小笠原 克彦2012 年 68 巻 10 号 p. 1314-1326
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーThis study aimed to contribute to the management of a healthcare organization by providing management information using time-series analysis of business data accumulated in the hospital information system, which has not been utilized thus far. In this study, we examined the performance of the prediction method using the auto-regressive integrated moving-average (ARIMA) model, using the business data obtained at the Radiology Department. We made the model using the data used for analysis, which was the number of radiological examinations in the past 9 years, and we predicted the number of radiological examinations in the last 1 year. Then, we compared the actual value with the forecast value. We were able to establish that the performance prediction method was simple and cost-effective by using free software. In addition, we were able to build the simple model by pre-processing the removal of trend components using the data. The difference between predicted values and actual values was 10%; however, it was more important to understand the chronological change rather than the individual time-series values. Furthermore, our method was highly versatile and adaptable compared to the general time-series data. Therefore, different healthcare organizations can use our method for the analysis and forecasting of their business data.抄録全体を表示PDF形式でダウンロード (2820K) -
竹永 枝里子, 中口 裕二, 丸山 雅人, 永末 望, 筧 清孝, 甲斐 祐大, 河野 友宏, 佐々木 幹治, 橋田 昌弘2012 年 68 巻 10 号 p. 1327-1332
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーIn this study, we evaluated various image guided radiation therapy (IGRT) systems regarding accuracy and patient throughput for conventional radiation therapy. We compared between 2D-2D match (the collation by 2 X-rays directions), cone beam computed tomography (CBCT), and ExacTrac X-Ray system using phantom for CLINAC iX and Synergy. All systems were able to correct within almost 1 mm. ExacTrac X-Ray system showed in particular a high accuracy. As for patient throughput, ExacTrac X-Ray system was the fastest system and 2D-2D match for Synergy was the slowest. All systems have enough ability with regard to accuracy and patient throughput on clinical use. ExacTrac X-Ray system showed superiority with accuracy and throughput, but it is important to note that we have to choose the IGRT technique depending on the treatment site, the purpose, and the patient’s state.抄録全体を表示PDF形式でダウンロード (904K) -
辰己 大作, 家永 晃功, 中田 良成, 四方田 あかね, 井上 誠, 市田 隆雄, 細野 雅子2012 年 68 巻 10 号 p. 1333-1339
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーStereotactic radiotherapy requires a quality assurance (QA) program that ensures the mechanical accuracy of a radiation field center. We have proposed a QA method for achieving the above requirement by conducting the Winston Lutz test using an electronic portal image device (EPID). An action limit was defined as three times the standard deviation. Then, the action limits for mean deviations of the radiation field center during collimator rotation, gantry rotation, and couch rotation in clockwise and counterclockwise resulted in 0.11 mm, 0.52 mm, 0.37 mm, and 0.41 mm respectively. Two years after the QA program was launched, the mean deviation of the radiation field center during gantry rotation exceeded the above action limit. Consequently, a mechanical adjustment for the gantry was performed, thereby restoring the accuracy of the radiation field center. A field center shift of 0.5 mm was also observed after a micro multi-leaf collimator was unmounted.抄録全体を表示PDF形式でダウンロード (1551K) -
野瀬 英雄, 白石 順二2012 年 68 巻 10 号 p. 1340-1345
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーIn order to manage relationship between patients’ movements and operating efficiency, we developed a special software which can make patient flow visible on a display monitor by use of actual data obtained from the radiology information system (RIS). In this software, a simple floor map of the radiology department in our hospital was drawn on the monitor and each patient was indicated with a small figure. This software was developed with commercialized computer software [Excel 2007 visual basic applications (VBA) Microsoft]. Movements of the patient figures were simulated by use of actual time data such as registration of radiology department, and start and ending time of examinations. The patient figures were moved along with predetermined flow lines every second. The movements of the patient figures were controlled by several buttons (i.e., play and stop) and setting switches for determining reproduction date and time. In conclusion, by use of this software, the patient flows could be analyzed systematically by checking efficient operation such as average waiting time of the patients and/or standby time of radiological technologists.抄録全体を表示PDF形式でダウンロード (1273K)
臨床技術
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高津 安男, 山村 憲一郎, 宮地 利明, 木村 哲哉, 上山 毅, 石黒 秋弘2012 年 68 巻 10 号 p. 1346-1353
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーIt is difficult for Rheumatoid Arthritis (RA) patients to remain in a strenuous position for a long time during examinations. The field of view (FOV): 250 mm is needed for hand examinations from the wrist to the finger. Two channel phased array coils are effective to use when examinations of the ‘off center’ are taken for the upper and lower extremities. The area of the array coils’ sensitivity can be expanded by shifting both coil elements 40–60% in the opposite direction of the element’s diameter. This method is given credibility due to the increased signal-to-noise ratio (SNR) in the peripheral regions (shifted directions), but loses value in the central area, as indicated by the decrease in SNR. This was confirmed in the image of the hand using visual assessment including the fat suppression technique. It was verified that the sensitivity area was expanded using Scheffe’s method of paired comparison (Ura’s modified method). An application at the other regions of the body can be expected to be used in the case of using parallel positioned coils during clinical situation.抄録全体を表示PDF形式でダウンロード (1855K) -
中澤 寿人, 内山 幸男, 小森 雅孝, 萩原 昌宏, 森 美雅2012 年 68 巻 10 号 p. 1354-1364
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーWe use Novalis Body system for stereotactic body radiation therapy (SBRT) in lung and liver tumors. Novalis system is dedicated to SBRT with image-guided patient setup system ExacTrac. The spinal bone is the main landmark in patient setup during SBRT using ExacTrac kV X-ray system. When the target tumor is located laterally distant from the spinal bone at the midline, it is difficult to ensure the accuracy of the setup, especially if there are rotational gaps (yaw, pitch and roll) in the setup. For this, we resolve the problem by using a virtual isocenter (VIC) different from isocenter (IC) .We evaluated the setup accuracy in a rand phantom by using VIC and checked the setup errors using rand phantom and patient cases by our original method during the setup for IC. The accuracy of setup using VIC was less than 1.0 mm. Our original method was useful for checking patient setup when VIC used.抄録全体を表示PDF形式でダウンロード (3808K) -
高津 安男, 中塚 隆之, 宮地 利明2012 年 68 巻 10 号 p. 1365-1372
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーThe method known as DIXON is imaging from two different echo times (TE), using the opposite phase of water and fat. Modified DIXON (mDIXON) is the method that is calculated from changing the opposing phases ‘in’ and ‘opposed’ phases of the actual measurement, to fit the theoretical value. We reviewed that the effect of the water-fat separation and contrast depended on the different flip angles (FA) and echo times (TE). The diluted gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA) (from 0 to 5 mmol/l) and liver model was stabilized by lard. In order to measure the SNR and %CV of the lard, the various combinations of TE and FA (from 5 to 20 degrees) were changed. The suitable range for the measurement of the SNR and %CV of the lard, and the contrast of gadolinium Gd-EOB-DTPA and the liver model, in the axial view (including 50% fat), was around the ‘opposed’ phase in the first TE (TE1) and around the ‘in’ phase in the second TE (TE2) and FA: 15degrees (TE1: 2.0–2.9 ms, TE2: 4.1–5.0 ms). In order to avoid phase dispersion, shorter TE range is more desirable (TE1: 2.0–2.25 ms, TE2: 4.1–4.5 ms). It is our understanding that the water-fat separation is better in these ranges and under these circumstances, good contrast was obtained.抄録全体を表示PDF形式でダウンロード (1932K)
資料
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森島 貴顕, 千田 浩一, 繁泉 和彦, 片平 美明, 瀬戸 初江, 千葉 浩生2012 年 68 巻 10 号 p. 1373-1378
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーRadiation safety education/training is essential and is associated with a reduction in the radiation dose to both patients and staff. We used a questionnaire to assess the level of radiation safety knowledge among nurses working at Tohoku Kosei-Nenkin Hospital. Some nurses were also interviewed. The results of our study indicate that the nurses had insufficient radiation safety knowledge and that a high percentage of nurses were concerned about the health hazards of radiation. Moreover, more than 80% of the nurses expressed an interest in attending periodic radiation safety seminars. Appropriate radiation safety training is required to reduce nurse radiation doses, and an understanding of radiation safety can help to optimize the patient dose.抄録全体を表示PDF形式でダウンロード (675K)
速報
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山田 幸子, 上口 貴志, 鵜飼 勲, 永井 由美子, 山川 正信, 下瀬川 恵久, 嶋津 岳士, 畑澤 順2012 年 68 巻 10 号 p. 1379-1384
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル フリーRenal cyst pseudoenhancement, an artifactual increase of computed tomography (CT) attenuation for cysts with increased iodine concentrations in the renal parenchyma, complicates the classification of cysts and may thus lead to the mischaracterization of a benign non-enhancing lesion as an enhancing mass. The purpose of this study was to use a phantom model to assess the ability of dual-energy virtual monochromatic imaging to reduce renal pseudoenhancement. A water-filled cylindrical cyst model suspended in varying concentrations of iodine solution, to simulate varying levels of parenchymal enhancement, was scanned with a dual-energy CT scanner using the following three scanning protocols with different combinations of tube voltage: 80 and 140 kV; 80 and 140 kV with tin filter; and 100 and 140 kV with tin filter. Virtual monochromatic images were then synthesized for each dual-energy scan. Single-energy scan with a tube voltage of 120 kV was also performed to obtain polychromatic images as controls. Mean attenuation values (in Hounsfield units) of cyst proxies were measured on both polychromatic and virtual monochromatic images. Pseudoenhancement was considered to be present when the cyst attenuation level increased by more than 10 HU as the background iodine concentration increased from 0.0% to 0.4%, 1.5%, or 2.5%. Our results revealed that pseudoenhancement was not observed on any of the monochromatic images, but appeared on polychromatic images at a background iodine concentration of 2.5%. We thus conclude that dual-energy virtual monochromatic images have a potential to reduce renal pseudoenhancement.抄録全体を表示PDF形式でダウンロード (726K)
第39回秋季学術大会 教育講演
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遠藤 登喜子2012 年 68 巻 10 号 p. 1385-1391
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (1920K)
教育講座—放射線技術学で必要な基礎統計学—
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西本 尚樹, 小笠原 克彦, 伊藤 陽一2012 年 68 巻 10 号 p. 1392-1400
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (1274K)
基礎講座—乳腺の診断から治療まで—
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對間 博之2012 年 68 巻 10 号 p. 1401-1412
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (2460K)
基礎講座—三次元コンピュータグラフィックス—
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内田 幸司2012 年 68 巻 10 号 p. 1413
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (118K) -
中井 宏章, 橋本 敬介2012 年 68 巻 10 号 p. 1414-1418
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (1491K)
臨床技術講座
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磯辺 智範, 森 祐太郎, 榮 武二, 松原 孝祐, 五十嵐 隆元2012 年 68 巻 10 号 p. 1419-1427
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (1492K)
JIRAトピックス
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西村 正俊2012 年 68 巻 10 号 p. 1428-1431
発行日: 2012/10/20
公開日: 2012/10/22
ジャーナル 認証ありPDF形式でダウンロード (350K)
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