Influence of Detector Radiation Damage on CR Mammography Quality Control

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  • Moriwaki Atsumi
    Department of Radiology, Kurashiki Medical Center
  • Ishii Mie
    Department of Radiology, Shimane University Hospital (Current address: Department of Radiological Technology, School of Health Sciences, Gifu University of Medical Science)
  • Terazono Shiho
    Department of Radiology, Kurashiki Medical Center
  • Arao Keiko
    Department of Radiology, Kurashiki Medical Center (Current address: Department of Radiological Technology, Kawasaki College of Allied Health Professions)
  • Ishii Rie
    Division of Clinical Radiology, Tottori University Hospital (Current address: Department of Radiological Technology, Faculty of Health and Welfare, Tokushima Bunri University)
  • Sanada Taizo
    Department of Radiological Technology, Okayama Saiseikai General Hospital
  • Yoshida Akira
    Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima

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Other Title
  • 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
  • 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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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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