日本放射線技術学会雑誌
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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67 巻, 5 号
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原著
  • 日本人の乳房厚に対応する線量評価法の検討
    大塚 智子, 鈴木 昇一, 小椋 美紀, 五十嵐 隆元
    2011 年 67 巻 5 号 p. 483-489
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.483
    ジャーナル フリー
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    Accuracy control of mammography equipment involves more than just equipment management; the proportions of the mammary glands used to obtain appropriate images is also important, as is control of the glandular X-ray dose in accordance with thickness. Methods for evaluating glandular dose include the ACR, EUREF, and IAEA protocols. The aim of this study was to elucidate the differences between the various protocols and to suggest a dose evaluation method suited to Japanese breast thickness. An ionization chamber dosimeter was used for dose measurement, with a 156 phantom used as a breast phantom for the ACR and a PMMA phantom used for the EUREF and IAEA. There were no major differences in the protocols. The AGDs in the breast phantoms recommended HVLs for each protocol but were 25–30% higher in the EUREF and IAEA compared with the ACR, owing to the different breast thicknesses in each case. The IAEA should be regarded as the basic method for implementing optimum accuracy control in Japan, and a 35-mm PMMA should be used to correspond most closely to Japanese breast thickness.
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  • 膝関節軟骨のT2値とT1ρ値：関節軟骨への荷重を考慮した分類
    鈴木 敏司, 勝又 康友, 松崎 正史, 山田 一範, 中神 龍太朗, 新津 守
    2011 年 67 巻 5 号 p. 490-496
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.490
    ジャーナル フリー
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    Measurement of T2 and T1ρ relaxation time is a quantitative evaluation technique that uses magnetic resonance imaging. This study aimed to evaluate T2 and T1ρ relaxation time considering the load on the knee. 14 healthy volunteers were studied at 3 T. Four main compartments were defined for cartilage analysis in the knee joint: lateral femoral condyle (LFC), medial femoral condyle (MFC), and lateral and medial tibia (LT and MT). Femur cartilage was partitioned into anterior, middle, and posterior nonweight-bearing (a-NWB, m-NWB, p-NWB) portions and weight-bearing (WB) portions. T2 and T1ρ values between the medial side and lateral side indicated a nonsignificant difference. T2 and T1ρ values of NWB portions were higher than those of WB portions. The measured value rate of extension of NWB to WB was more remarkable in the T1ρ value than in the T2 value. Therefore, evaluating cartilaginous injuries and damages using the T1ρ value seems to more effectively describe them.
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ノート
  • マルチリーフコリメータの位置精度が強度変調放射線治療の線量分布に及ぼす影響
    佐々木 幹治, 富永 正英, 生島 仁史, 岸 太郎, 川下 徹也, 原 康男, 福永 有希子, 木村 雅司, 下窪 康史, 高志 智, 笈 ...
    2011 年 67 巻 5 号 p. 497-506
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.497
    ジャーナル フリー
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    In multileaf collimator (MLC)-based intensity modulated radiation therapy (IMRT), the dose is influenced by the uncertainty of MLC driving control. In this study, we examined the influence of MLC driving control accuracy on dose evaluation (gamma analysis) by evaluating 60-day MLC driving control accuracy (stationary positioning accuracy and positioning reproducibility) once a week as well as measuring IMRT dose distribution. The MLC positioning accuracy accompanied variation over time and tended to expand by 0.1 to 0.15 mm in one week and about 1 mm in 60 days. In terms of reproducibility, errors were within 0.2 mm for more than 95%. For prostate IMRT, when MLC stationary positioning accuracy was around 1 mm, no significant difference was observed in the pass rate in gamma analysis. Therefore, the results suggest that regular maintenance by setting a permissible value determined by the MLC positioning accuracy test can be an effective indicator in the future for maintaining the safety of IMRT.
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  • 心臓カテーテル検査における推定被曝線量解析ソフトの開発と放射線照射部位の推定
    尾崎 道雄, 武 俊夫, 隅 真一郎, 安藤 博明, 中澤 靖夫
    2011 年 67 巻 5 号 p. 507-516
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.507
    ジャーナル フリー
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    We developed software for estimating exposure doses and radiation exposure regions in cardiac catheterization inspection. In the software, the back of a thoracic phantom were divided into a total of 21 square blocks with a width of 30 degrees. Furthermore, we developed a system with which reference air kerma is distributed to each of the above blocks in accordance with the distribution ratio calculated from the data obtained by the system, and the calculation results are displayed. Coronary angiography was performed using thoracic phantoms, and actual measurements were obtained using a fluoroglass dosimeter. The calculated results obtained using the software were compared to the measured results. An almost identical tendency was seen, and the radiation regions of the top three estimated exposure doses were successfully estimated. Radiation region estimation using this software is affected by exposure time as one of its properties. This software enables estimating radiation exposure regions and exposure doses.
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  • 心筋SPECT画像におけるコリメータ開口補正の基礎的検討
    坪井 孝達, 布施 拓
    2011 年 67 巻 5 号 p. 517-523
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.517
    ジャーナル フリー
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    The purpose of this study was to evaluate the effect of myocardial perfusion imaging that is reconstructed using the ordered subsets-expectation maximization (OS-EM) method with collimator broad correction. Methods: A cardiac phantom and clinical data (with ten normal patients) were used. These projection data were reconstructed using OS-EM with collimator broad correction (OS-EM(+)), without collimator broad correction (OS-EM(-)), and with filtered back projection (FBP). We analyzed the reconstructed images using the following: FWHM of reoriented short-axis data, volume calculated using QGS software, and a polar map calculated using QPS software. Results and Conclusion: On the important point of spatial resolution, OS-EM(+) was excellent compared with FBP. However, a difference in % uptake was seen in one segment. Therefore, when a quantitative myocardial SPECT evaluation is done, the treatment of the numerical value needs to be noted.
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臨床技術
  • 123I-IMP Graph Plot法検査時間短縮プロトコールの検討
    山本 泰司, 小野口 昌久, 和田 昭彦, 皿田 勝裕, 原元 益夫, 小松 明夫, 北垣 一, 山口 修平
    2011 年 67 巻 5 号 p. 524-533
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.524
    ジャーナル フリー
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    The 123I-IMP Graph Plot is a convenient method of analyzing cerebral blood flow without blood sampling. Data acquisition requires 45 minutes after the infusion of 123I-IMP because the method is matched to the protocol of autoradiography (conventional method). However, we think that those protocols do not have to be matched because those theories are different. Therefore, we contrived a protocol for shortening that time by beginning SPECT data acquisition earlier and shortening the acquisition time compared to the conventional method. We compared count ratios of the decreased area to an area of the healthy side, quantitative values, and results of statistical analysis of the shortened protocol and the conventional method for cases of cerebral infarction and of dementia with Lewy bodies (DLB). Some count ratios of the shortened protocol were inferior to those of the conventional method, but the degrees did not affect the clinical diagnosis. In the other areas and cases also, the differences did not affect the clinical diagnosis. In addition to the results of this study, some previous reports have described that early SPECT images after infusion show the true cerebral blood flow. Therefore, we judged that this shortened protocol can be used as a clinical protocol.
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  • シミュレーションファントムを用いた減弱補正アルゴリズムの評価
    松友 紀和, 大西 英雄, 長木 昭男
    2011 年 67 巻 5 号 p. 534-540
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.534
    ジャーナル フリー
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    Purpose: An attenuation correction is necessary to improve quantitative SPECT evaluation. The aim of this study was to evaluate the performance of several different types of commercial attenuation correction algorithms. Methods: We investigated the performance of four attenuation correction algorithms using a simulation phantom with and without scatter. The attenuation correction was performed on clinical SPECT workstations: GMS5500/PI (Toshiba), GMS7700/A (Toshiba), e.soft (Siemens), and Xeleris (GE). Then, the effect of the attenuation correction was evaluated using the count profile curve and attenuation coefficient that maintained uniformity of the radioisotope distribution in the uniform region of the images. Results: In the without-scatter condition, the count profile curve showed a similar shape on all workstations. The attenuation coefficients that maintained uniformity were 0.134, 0.133, 0.133, and 0.135 cm-1 using GMS5500/PI, GMS7700/A, e.soft, and Xeleris, respectively. There was no significant difference among these workstations. With scatter, the attenuation coefficients differed by 0.109–0.121 cm-1 with the types of attenuation correction algorithms. Conclusion: Without scatter, the effects of the attenuation corrections were equivalent. However, with scatter, a few differences were observed in the effects of correction with several types of algorithms. Therefore, our results suggest that careful evaluation should be considered when different types of clinical SPECT workstations are used.
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資料
  • 医療機関における診療放射線技師への医療情報教育に関する調査
    池田 龍二, 小笠原 克彦, 奥田 保男, 小西 康彦, 大場 久照, 星野 修平, 細羽 実
    2011 年 67 巻 5 号 p. 541-548
    発行日: 2011/05/25
    公開日: 2011/06/10
    DOIhttps://doi.org/10.6009/jjrt.67.541
    ジャーナル フリー
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    Recently, the importance of medical information for radiologic technologists has increased. The purpose of this questionnaire survey was to clarify the method of acquiring skill in medical information for radiologic technologists from the point of view of the managers of radiology departments. The questionnaire was sent to 260 hospitals that had introduced picture archiving and communication systems (PACSs) for the person responsible for medical information in the radiology department. The response rate was 35.4% (92 hospitals). The results of this survey clarified that few hospital have staff for medical information in the radiology department. Nevertheless, the excellent staff who have the skills to troubleshoot and develop systems are earnestly needed in radiology departments. To solve this problem, many technologists should understand the content, work load, and necessity of medical information. In addition, cooperation between radiologic technologist schools and hospitals is important in the field of medical information education.
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第66回総会学術大会シンポジウム3
第66回総会学術大会　ST講座
第38回秋季学術大会　教育講演
教育講座－研究方法論－
臨床技術講座
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