品質管理におけるマンモグラフィ用イメージングプレートのX 線による焼き付けの影響

DOI Web Site Web Site PubMed 参考文献2件 オープンアクセス
  • 森脇 淳美
    倉敷成人病センター放射線技術科
  • 石井 美枝
    島根大学医学部附属病院放射線部(現岐阜医療科学大学保健科学部放射線技術学科)
  • 寺園 志保
    倉敷成人病センター放射線技術科
  • 荒尾 圭子
    倉敷成人病センター放射線技術科(現川崎医療短期大学放射線技術科)
  • 石井 里枝
    鳥取大学医学部附属病院放射線部(現徳島文理大学保健福祉学部診療放射線学科)
  • 眞田 泰三
    岡山済生会総合病院画像診断科
  • 吉田 彰
    県立広島大学大学院総合学術研究科

書誌事項

タイトル別名
  • Influence of Detector Radiation Damage on CR Mammography Quality Control
  • ヒンシツ カンリ ニ オケル マンモグラフィヨウ イメージングプレート ノ Xセン ニ ヨル ヤキツケ ノ エイキョウ

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説明

Recently, radiation damage to the detector apparatus employed in computed radiography (CR) mammography has become problematic. The CR system and the imaging plate (IP) applied to quality control (QC) program were also used in clinical mammography in our hospital, and the IP to which radiation damage has occurred was used for approximately 5 years (approximately 13,000 exposures). We considered using previously acquired QC image data, which is stored in a server, to investigate the influence of radiation damage to an IP. The mammography unit employed in this study was a phase contrast mammography (PCM) Mermaid (KONICA MINOLTA) system. The QC image was made newly, and it was output in the film, and thereafter the optical density of the step-phantom image was measured. An input (digital value)-output (optical density) conversion curve was plotted using the obtained data. The digital values were then converted to optical density values using a reference optical density vs. digital value curve. When a high radiation dose was applied directly, radiation damage occurred at a position on the IP where no object was present. Daily QC for mammography is conducted using an American College of Radiology (ACR) accreditation phantom and acrylic disc, and an environmental background density measurement is performed as one of the management indexes. In this study, the radiation damage sustained by the acrylic disc was shown to differ from that of the background. Thus, it was revealed that QC results are influenced by radiation damage.

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