徳島大学 教育・研究者情報データベース(EDB)

1. 西原 貞光

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2. (英) Yamashita Yuki

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3. (英) Kawai Naoki

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4. 大塚 秀樹([徳島大学.大学院医歯薬学研究部.保健学域.保健科学部門.放射線科学系.画像医学・核医学]/[徳島大学.医学部.保健学科.放射線技術科学専攻.診療放射線技術学講座])

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(英) Usefulness of the SNR Using the Subtraction Method and Image Visibility Using the Howlett Chart Method in X-ray Fluoroscopic System

(英) X-ray fluoroscopy has not only been used for diagnoses but also treatment, as in interventional radiology. The aim of this study is to assess the usefulness of the signal-to-noise ratio (SNR) using the subtraction method, which is used in the quality assurance/quality control (QA/QC) of magnetic resonance imaging (MRI) equipment, and image visibility using the Howlett chart method in the fluoroscopic examination. The fluoroscopy unit has a detector with an image intensifier and a color liquid crystal display. A 2620 dosimeter and an ionization chamber were selected for the dose measurement. Fluoroscopic images for visual and physical evaluations were collected as dynamic data. The skin surface absorbed dose rates in each tube current were measured using a dosimeter. The SNR using the subtraction method and image visibility using the Howlett chart method were examined. The results from both indicate that as the SNR improves, visual evaluation increases, but the rate of increase gradually saturate. Therefore, physical and visual evaluations are possible with the SNR using the subtraction method and the image visibility using the Howlett chart method.

1. (英) X-ray fluoroscopic system
2. (英) signal-to-noise ratio
3. (英) Howlett chart
4. (英) visibility