Observations of Deterioration of Photo-Stimulable Phosphor Plates Used in Digital Mammography and Its Effects on Mammography Diagnoses

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  • Yasuda Mitsuyoshi
    Faculty of Health Sciences, Komazawa University Department of Radiological Technology, Showa University Fujigaoka Hospital
  • Kato Kyoichi
    Graduate School of Nursing and Rehabilitation Sciences, Showa University
  • Kurosawa Syun
    Department of Radiological Technology, Showa University Fujigaoka Hospital
  • Yoshikawa Kohki
    Faculty of Health Sciences, Komazawa University
  • Sato Hisaya
    Graduate School of Nursing and Rehabilitation Sciences, Showa University
  • Takahashi Toshiyuki
    Graduate School of Nursing and Rehabilitation Sciences, Showa University
  • Iwai Tugunori
    Graduate School of Nursing and Rehabilitation Sciences, Showa University
  • Watanabe Hiroyuki
    Graduate School of Nursing and Rehabilitation Sciences, Showa University
  • Nakazawa Yasuo
    Graduate School of Nursing and Rehabilitation Sciences, Showa University

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Other Title
  • ディジタルマンモグラフィの輝尽性蛍光体プレート劣化による臨床画像への影響
  • ディジタルマンモグラフィ ノ キジンセイ ケイコウタイ プレート レッカ ニ ヨル リンショウ ガゾウ エ ノ エイキョウ

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We noted that breast-like artifacts occur in photo-stimulable phosphor plates (PSPs) used for long periods in digital mammography systems. This prompted us to investigate the effects on mammography diagnoses of these artifacts. Our study took the form of a comparison between the images generated by a long-term use PSP (four years use) and a short-term use PSP. First, an acrylic phantom and an in-house-made phantom for visual evaluation were imaged using X-ray PSPs under the same exposure conditions. They were then scanned under the same conditions to generate images. The mean values of the digital signals were measured in the 35 locations of region of interest present in the images of the acrylic phantom. The images of the in-house-made phantom were then visually evaluated by five certified experts, who examined 22 clinical images taken with both PSPs while referring to a visual evaluation scale. Differences were detected in all the evaluated items: the short-term use PSP gave a higher rate than the long-term use PSP (p<0.01), suggesting that long-term use PSPs might adversely affect the results of diagnostic mammography.

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