白木 茂博¹, 後藤 和夫¹, 野口 良樹¹, 岡山 安孝¹, 松葉 周三¹, 尾関 規重², 武内 俊彦², 瀬尾 育弐³

Shigehiro SHIRAKI¹, Kazuo GOTO¹, Yoshiki NOGUCHI¹, Yasutaka OKAYAMA¹, Shuzo MATSUBA¹, Norishige OZEKI², Toshihiko TAKEUCHI², Yasutsugu SEO³

¹岐阜県立多治見病院消化器科, ²名古屋市立大学医学部第一内科, ³東芝医用器機技術研究所

¹Department of Gastroenterology, Gifu Prefectural Tajimi Hospital, ²First Department of Internal Medicine, Nagoya City University Medical School, ³Medical Engineering Laboratory, TOSHIBA Corp.

キーワード : Pulsed Doppler flowmeter, Portal blood flow

　In a fundamental examination, we attempted to see if there is any problem in the determination of partial blood flow velocity using SAL50A/SDL01A (TOSHIBA). In a water bath study using preserved blood, the ratio of the actual mean velocity (V_mean) to the maximum velocity estimated from the Doppler spectrum (V_Dmax), i.e. V_mean/V_Dmax, was 0.54. This index remained almost unchanged even when the tube diameter, incidence angle or sampling width was varied. However, the degree of error in the estimation of the mean velocity from the Doppler spectrum (V_Dmean) varied according to the size of the tube and the sampling width. Therefore, for determination of partial blood flow velocity in vivo, it was considered better to multiply V_Dmax by the index (0.54) than to use V_Dmean.