Nine healthy volunteers were studied to validate the reproducibility of the Doppler perfusion index--the ratio of hepatic arterial to total liver blood flow--and to evaluate the method of its derivation and the influence of the variable parameters necessary for its calculation. Wide intraobserver variability was observed, and Doppler perfusion index values were consistently outside the previously reported normal range.
This study examined the possible harmful effects on the eye of prolonged exposure to ultrasound at diagnostic intensities. The left eyes of 20 rabbits were exposed to 9.5 mHz continuous wave ultrasound a t 33.7 mWicrn2 for one to four hours. The right eyes serves as controls. Careful gross and microscopic examination did not reveal any morphological effects caused by ultrasonic irradiation.
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