Online Journal
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Journal of Medical Ultrasonics

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1988 - Vol.15

Vol.15 No.01

Original Article(原著)

(0001 - 0010)

ドプラ断層画像のコンピュータシミュレーション −フレーム数,走査方向,入射角度の影響−

Computer Analysis of Two-Dimensional Doppler -Influence of Frame Rate, Scanning Direction and Incident Angle-

近藤 祐司1, 許 俊鋭2, 松村 誠2, 尾本 良三2

Yuji KONDO1, Shunei KYO2, Makoto MATSUMURA2, Ryozo OMOTO2

1アロカ株式会社, 2埼玉医科大学第一外科

1Aloka Co., Ltd., 2Department of Surgery, Saitama Medical School

キーワード : Frame rate, Scanning direction, Incident angle, Maximum flow area

To investigate the feasibility of quantitative analysis of Two-Dimensional Doppler, we need to know the physical characteristics of that. For the purpose of quantification of flow display we analysed the influence of frame rate, scanning direction and incident angle by means of computer based simulation. In the simulation flow was set to have sinusoidal flow pattern and as pulsatile. Flow profile in vertical direction to the flow direction was simulated as parabolic shape. The result of the simulation was, 1) As the influence of incident angle, detected flow area was always smaller than the true flow area. 2) The distortion of the display of detected flow to the true flow was larger in the lower frame rate and scanning against the flow direction than the scanning following the flow. 3) In spite of the distortion, if we ignore the influence of incident angle the maximum flow area which was obtained at the different phase in cardiac cycle was the same in each scanning condition.
Through the simulation we reached the conclusion that if we can make an adequate angle correction the true maximum flow area can be obtained regardless of the scanning condition.