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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63 巻, 11 号
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巻頭言
原著
  • 3.0T MRI 装置を用いた 3D Double IR FSPGR 法による血液のアーチファクトの低減
    藤原 康博, 松田 豪, 石森 佳幸, 山口 功, 林 弘之, 大越 優祐, 大谷 友梨子, 宮地 利明, 木村 浩彦
    2007 年 63 巻 11 号 p. 1239-1245
    発行日: 2007/11/20
    公開日: 2008/01/10
    DOIhttps://doi.org/10.6009/jjrt.63.1239
    ジャーナル フリー
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    The purpose of this study was to decrease vascular artifacts caused by the in-flow effect in three-dimensional inversion recovery prepared fast spoiled gradient recalled acquisition in the steady state (3D IR FSPGR) at 3.0 Tesla. We developed 3D double IR FSPGR and investigated the signal characteristics of the new sequence. The 3D double IR FSPGR sequence uses two inversion pulses, the first for obtaining tissue contrast and the second for nulling vascular signal, which is applied at the time of the first IR period at the neck region. We have optimized scan parameters based on both phantom and in-vivo study. As a result, optimized parameters (1st TI=700 ms, 2nd TI=400 ms) successfully have produced much less vessel signal at reduction than conventional 3D IR FSPGR over a wide imaging range, while preserving the signal-to-noise ratio (SNR) and gray/white matter contrast. Moreover, the decreased artifact was also confirmed by visual inspection of the images obtained in vivo using those parameters. Thus, 3D double IR FSPGR was a useful sequence for the acquisition of T1-weighted images at 3.0 Tesla.
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臨床技術
  • 脳血管IVRにおける水晶体被曝に対する防護シールドの作成と被曝低減効果
    武 俊夫, 佐藤 香織, 木内 克典, 中澤 靖夫
    2007 年 63 巻 11 号 p. 1246-1252
    発行日: 2007/11/20
    公開日: 2008/01/10
    DOIhttps://doi.org/10.6009/jjrt.63.1246
    ジャーナル フリー
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    A variety of radiation hazards resulting from interventional radiology (IVR) have been reported in recent years. Particularly affected are the skin and the crystalline lens, with their high radiation sensitivity. During neurological interventions, the radiological technologist should consider decreasing radiation exposure. We found exposure projections where the exposure dose became a radiation hazard for the crystalline lens, and examined an efficient method of cover for the exposure projections used for neurological interventions. The exposure projection for maximum crystalline lens radiation exposure was a lateral projection. In the crystalline lens the maximum exposure to radiation was on the X-ray tube side. The method of defense adopted was that of installing a lead plate of the appropriate shape on the surface of the X-ray tube collimator. In other exposure projections, this cover did not become a redundant shadow. With the cover that was created, the X-ray side crystalline lens lateral projection could be defended effectively.
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速報
  • GafChromic線量測定における光学フィルタを用いた感度特性に関する検討
    加茂前 健, 宮部 結城, 中田 学, 矢野 慎輔, 岡田 孝, 高倉 亨, 藤本 隆広, 越田 吉郎, 菊池 雄三
    2007 年 63 巻 11 号 p. 1253-1256
    発行日: 2007/11/20
    公開日: 2008/01/10
    DOIhttps://doi.org/10.6009/jjrt.63.1253
    ジャーナル フリー
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    GafChromic EBT film (GC-EBT) is lower in sensitivity than ready-pack film. The purpose of this study was to increase GC-EBT sensitivity by using band-pass filters and a polarized light filter. The filters were inserted between the GC-EBT and the scanner bed and digitized. We evaluated the sensitivity characteristic, amount of noise, and the dose corresponding to noise. When only the band-pass filter was inserted, a filter of transmission wavelength peak at 600 nm showed the maximum sensitivity. When a filter of 600 nm in transmission peak at wavelength was combined with a polarized light filter, sensitivity improved. There was no increase in the amount of noise according to the type of filter. The dose corresponding to noise increased as the quantity of light after passing through the filter decreased. When a suitable band-pass filter for the absorption peak of GC-EBT was used, it was suggested to be able to improve sensitivity without increasing noise.
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第34回秋季学術大会　モーニングフレッシャーズセミナー
教育講座―技師が書く技師のための読影講座―
基礎講座―検査を実施する上で知っておきたい画像処理技術―
臨床技術講座
連載読み物―医療の周りの法律について（6）―
学術調査研究班報告
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