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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68 巻, 9 号
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巻頭言
第40回秋季学術大会プログラム
原著
  • カテーテルアブレーションとPercutaneous Coronary Intervention(PCI)における被ばく低減対策の有効性の検証
    梅津 芳幸, 小川 和久, 重谷 昇, 木下 絵美, 宮崎 仁志, 船間 芳憲
    2012 年 68 巻 9 号 p. 1221-1230
    発行日: 2012/09/20
    公開日: 2012/09/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.9.1221
    ジャーナル フリー
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    With an increasing number of interventional radiology (IVR) procedures, it is a critical issue to control and reduce the radiation dose for patients by radiological technologists. In our study, we analyzed the usefulness of a provision for radiation reduction on catheter ablation and percutaneous coronary intervention (PCI) procedures based on the data from radiation information system (RIS). With regard to catheter ablation, 50% reduction was enabled with decreasing fluoroscopic and radiographic conditions regardless of each technique. Radiation reduction enabled a decrease in the fluoroscopic dose during PCI procedure. However, note that excessive radiation reduction does not show positive results of the radiation dose reduction. Moreover it leads to an increase in fluoroscopic time.
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  • 1.5 Tおよび3.0 T-MR検査における人体の一部で形成されたループのRF発熱に関する検討─人体等価ループファントムを用いた温度測定─
    山﨑 勝, 東田 満治, 工藤 禎宏, 出田 貴裕, 中澤 雅美
    2012 年 68 巻 9 号 p. 1231-1241
    発行日: 2012/09/20
    公開日: 2012/09/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.9.1231
    ジャーナル フリー
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    Thermal injuries have been sometimes reported due to a closed conducting loop formed in a part of the patient’s body during magnetic resonance imaging (MRI). In recent years, 3.0 T-MRI scanner has been widely used. However, it is considered that the specific absorption rate (SAR) of 3.0 T-MRI can affect the heat of the loop because its own SAR becomes approximately 4 times as much as that of the1.5 T-MRI scanner. With this, the change in temperature was measured with human body-equivalent loop phantom in both 1.5 T-MRI and 3.0 T-MRI. In the two scanners, the temperature during 20 min of scanning time was measured with three types of sequences such as field echo (FE), spin echo (SE), and turbo SE (TSE) set up with the same scanning condition. It was found from the result that rise in temperature depended on SAR of the scanning condition irrespective of static magnetic field intensity and any pulse sequences. Furthermore, the increase of SAR and rise in temperature were not only in proportion to each other but also were indicated to have good correlation. However, even low SAR can occasionally induce serious thermal injuries. It was found from result that we had to attempt not to form a closed conducting loop with in a part of the patient’s body during MRI.
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  • 複数機種において同一被験者群を用いて得られた Fractional Anisotropy値の比較
    五月女 康作, 石森 佳幸, 磯辺 智範, 佐藤 英介, 篠田 和哉, 大久保 淳, 平野 雄二, 大須賀 覚, 松下 明, 宮本 勝美, ...
    2012 年 68 巻 9 号 p. 1242-1249
    発行日: 2012/09/20
    公開日: 2012/09/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.9.1242
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    The fractional anisotropy (FA) is calculated by using diffusion tensor imaging (DTI) with multiple motion probing gradients (MPG). While FA has become a widely used tool to detect moderate changes in water diffusion in brain tissue, the measured value is sensitive to scan parameters (e.g. MPG-direction, signal to noise ratio, etc.). Therefore, it is paramount to address the reproducibility of DTI measurements among multiple centers. The purpose of this study was to assess the inter-center variability of FA. We studied five healthy volunteers who underwent DTI brain scanning three times at three different centers (I–III), each with a 1.5 T scanner having a different MPG-schema. Then, we compared the FA and eigenvalue from the three centers measured in seven brain regions: splenium of corpus callosum (CCs), genu of corpus callosum (CCg), putamen, posterior limb of internal capsule, cerebral peduncle, optic radiation, and middle cerebellar peduncle. At the CCs and CCg, there was a statistical difference (p<0.05) between center Iand center IIfor the same MPG-directions. Furthermore, at CCs and CCg, there was a statistical difference (p<0.05) between center II and center III for different MPG-directions. Conversely, no statistical differences were found between center I and center III for the different MPG-directions for all regions. These results indicate that the FA value was affected by the MPG-schema as well as by the MPG-directions.
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臨床技術
  • 64列冠動脈CT検査におけるβ遮断薬静脈投与による心拍数コントロールの効果に関する検討
    山口 隆義, 高橋 大地, 中川 真吾, 森田 真理, 野田 理恵, 中村 陽子, 五十嵐 慶一
    2012 年 68 巻 9 号 p. 1250-1260
    発行日: 2012/09/20
    公開日: 2012/09/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.9.1250
    ジャーナル フリー
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    The purpose of this study is to clarify the effectiveness of the use of β-blocker in coronary computed tomography angiography (CCTA). In 1783 patients, heart rate was controlled by propranolol injection to patients with heart rates of 61 bpm or more. As a result, the scan heart rate (58.8±6.5 bpm) decreased significantly compared with the initial heart rate (72.7±9.4 bpm). Prospective gating method was used by 61.9% including 64.3% of the intravenous β-blocker injection group. Moreover, daily use of oral β-blocker had influence on reduction of the scan heart rate (daily use group: 60.1±6.5 bpm vs. unuse group: 58.5±6.3 bpm p<0.01). When we evaluated the image quality of CCTA by the score, the improvement of the score was obviously admitted by 65 bpm or less of the scan heart rate. The ratio of scan heart rate that was controlled by 65 bpm or less was decreased in the initial heart rate groups that were 81 bpm or more. The incidence of adverse reactions by the propranolol injection was few, and these instances only involved slight symptoms. Therefore, heart rate control with the use of β-blocker is useful for the image quality improvement of CCTA. This form of treatment can be safely enforced.
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