著者

伊藤 茂 平野 徹 岩崎 勝郎 上谷 雅孝 楢林 好隆

出版者

West-Japanese Society of Orthopedics & Traumatology

雑誌

整形外科と災害外科 (ISSN:00371033)

巻号頁・発行日

vol.43, no.4, pp.1423-1425, 1994-09-25 (Released:2010-02-25)

参考文献数

8

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We studied the MRI finding of pigmented villonodular synovitis (PVS) in the knee joints of two patients. Diffuse nodular lesions of PVS were typically shown as a low intensity area, on both T1 and T2 weingted MRI. High intensity areas on T2 were intermingled within the lesions.MRI revealed not only the lesions in the joint space but also osseous lesions in the medial, lateral and posterior condyles of the femur and the intercondylar tubercle of the tibia. These results suggest that PVS invades bones from the capsular or ligamentous attachments.

著者

永末 望 船間 芳憲 鬼木 里佳 瀬川 敦史 岩竹 聡 川内野 友彦 上谷 雅孝

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.65, no.6, pp.765-772, 2009-06-20 (Released:2009-07-14)

参考文献数

15

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We measured the contrast-to-noise ratio (CNR) and evaluated low-contrast images and streak artifacts to optimize abdominal C-arm CT imaging, and we investigated the view number, acquisition matrix, and pixel depth. To measure CNR, we filled 0.125–1.0-inch cavities in an American Association of Physicists in Medicine (AAPM) CT performance phantom with a sodium chloride solution. Five radiological technologists visually evaluated the noise, signal conspicuity at low-and high-signal density, and the overall image quality using paired comparisons based on Thurstone’s law. In a given acquisition matrix, the total view number had the greatest effect on the image noise, artifacts, and signal detectability on C-arm CT images. For a given incident dose per view on the flat-panel detector (FPD), fewer images with noise and streak artifacts resulted when a larger view number was selected.