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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71 巻, 10 号
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  • 低レベル放射能の68Geを用いた 68Ge/68Gaジェネレータの作製と放射化学実習への応用
    鷲山 幸信, 天野 良平, 野崎 正, 小川 幸次, 永津 弘太郎, 阪間 稔, 井戸 達雄, 山口 博司
    2015 年 71 巻 10 号 p. 983-993
    発行日: 2015年
    公開日: 2015/10/20
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.10.983
    ジャーナル フリー
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    The low-level radioactivity of a 68Ge/68Ga generator is a suitable tool for measuring radioactive growth and decay after 68Ga milking due to their desirable nuclear decay properties, such as the EC decay of 68Ge with no γ-ray emission andthe β+ decay of 68Ga with a weak γ-ray emission. To experience andund erstandrad ioactive equilibrium during a university laboratory course, we surveyedandtestedthe production of a small amount of 68Ge and set up educational programs to manufacture a 68Ge/68Ga generator for measuring the growth andd ecay of 68Ga. The irradiation of natGa with 25 μA of a 30 MeV proton beam from a cyclotron for 4 h yields ca. 111 MBq of 68Ge, which was sufficient to supply to several universities. For use as the adsorbent of the generator column, particles of hydrated tin (VI) oxide were prepared from precipitated tin hydroxide gel. Repeated elution of 68Ga from the handmade 68Ge/68Ga generator gave constant amounts of 68Ga with acceptable breakthrough of 68Ge. The feedback from the student’s experience with the 68Ge/68Ga generator was evaluatedby annual questionnaire surveys, which were given to all students taking the course every year from 2012 to 2014. It has been made clear that more than half of the students were interested in the 68Ge/68Ga generator program, andthis interest increasedfrom 54.9%in 2012 to 78.6%in 2014. A low-level radioactive 68Ge/68Ga generator is thus expectedto be a suitable experimental tool for demonstrating the phenomenon of radioactivity to students in an intriguing way.
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  • 単板ファントム傾斜板法を用いた MRI 3D撮像における解像特性評価の検討
    吉田 礼, 町田 好男, 引地 健生
    2015 年 71 巻 10 号 p. 994-1002
    発行日: 2015年
    公開日: 2015/10/20
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.10.994
    ジャーナル フリー
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    Recent remarkable progress of fast imaging techniques in 3D MRI has emphasized the importance of evaluation of its resolution characteristics. A trial point spread function (PSF) measurement was conducted using the ramp method, a conventional measurement method for the slice profile of 2D imaging, as an approach to evaluate the resolution characteristics of 3D imaging. However, problems peculiar to 3D imaging have arisen, such as artifacts and offsets in the slice selective direction. Therefore, we attempted PSF measurement using a phantom having a single-plate construction with only a simple ramp part (Single Plate Thin-Ramp Method) to respond to these shortcomings. By employing appropriate positioning and simple post processing, we obtained a PSF easily in both phase encoding and slice selective directions without the artifacts and offsets described above. Furthermore, it was possible to evaluate the change of resolution characteristics depending on the scan condition in three-dimensional MR image.
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臨床技術
  • Test Bolus Tracking法を使用した冠動脈 CTにおけるトリガポイントの教育の有用性
    板谷 春佑, 神山 哲也, 由野 博之
    2015 年 71 巻 10 号 p. 1003-1010
    発行日: 2015年
    公開日: 2015/10/20
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.10.1003
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    Background: Test bolus tracking (TBT) method has been used in coronary CT examination, because it is possible to examine the optimum contrast timing. However, the scan timing highly depends on an operators' recognition of peak in test bolus, thus there is a possibility of variation in contrast effect. Purpose: The aim of this study is to improve the variation of contrast effect among the operators. Methods: The training for the operators was conducted to acknowledge them the optimal trigger points. The mean CT value and standard deviation of the ascending aorta were calculated to compare before and after the training. Results: The mean CT value of the ascending aorta after the training was 485.02±73.06 HU, compared to 462.53±78.26 HU before the training. Standard deviation was significantly lower than before the training. Conclusion: The variation of contrast effect between the operators has been reduced by the training, and reproducibility of the examination has been improved.
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第71回総会学術大会　専門部会合同シンポジウム
第71回総会学術大会　教育講演
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