骨シンチグラフィ用放射性医薬品投与後の患者から放出される　γ線がＣＲマンモグラフィの画質に及ぼす影響の検討

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  • An Investigation of the Effect of Gamma Rays Emitted by Patients Undergoing Radionuclide Bone Scintigraphy in Computed Radiography during X-ray Mammography Examination
  • コツ シンチグラフィヨウ ホウシャセイ イヤクヒン トウヨ ゴ ノ カンジャ カラ ホウシュツ サレル ガンマセン ガ CR マンモグラフィ ノ ガシツ ニ オヨボス エイキョウ ノ ケントウ

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For convenience of outpatients, mammographies of outpatients are often taken after the injection of a radionuclide. In this study, we investigated the effects of gamma rays emitted by a patient onto imaging plates (IPs). We used a flat container filled with 99mTc solution as a planar source to irradiate gamma rays onto IPs. We changed irradiation times on each IP, and took radiographies of an ACR-specified 156 model phantom and AGH-D210F phantom. We evaluated radiography images, using visual evaluation, and profile curves, histograms, and CNR and RMS granularities analyses. The results indicated that the depiction ability of a fibrous part began to fall when the irradiation time exceeded 3 minutes. With an increase in irradiation time, an increase in pixel value and RMS granularity value and a decrease in CNR value were observed. In conclusion, IP exposed by gamma rays influenced the evaluation of phantom images.

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