Neurosonology:神経超音波医学
Print ISSN : 0917-074X
ISSN-L : 0917-074X
Spectral-Shift Zero-Crossing法による周波数依存減衰に関する研究
―新生児・乳児の脳への応用―
谷口 信行伊東 紘一倉松 俊弘柳沢 正義
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1989 年 2 巻 2 号 p. 81-85

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Frequency Dependent Attenuation (FDA) measurment in liver, spleen, thyroid, and breast had been reported previously. We measured FDA of cerebrum, cerebellum and thalamus in normal brain tissue in infancy using the Spectral-Shift Zero-Crossing method. FDA values were as follows : cerebrum, 0.37±0.06dB/ cm/MHz (mean±SD) ; cerebellum, 0.52±0.14dB/cm/MHz; thalamus, 0.50±0.11dB/cm/MHz. Significant differences of FDA values were found between cerebrum and other two tissues. These data suggest FDA value shows the difference of water and lipid balance in the brain tissue. Therefore, FDA will be useful to estimate brain edema, bleeding and/or ischemia in newborns and young infants.

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