| 摘要 |
An ultrasonic diagnostic apparatus transmits ultrasonic waves at such a strength as to disperse the contrast agent for part of a number of sonic beams which form one frame and at such a strength as not to disperse the contrast agent for other sonic beams thereby to produce an image for a marking frame from received echo signals of ultrasonic transmission, and subsequently transmits ultrasonic waves successively at such a strength as not to disperse the contrast agent for all sonic beams thereby to produce images continuously for no-marking frames, and, after such a time length that the flow range is present within the view field, produces an image for another marking frame. These operations are repeated to display ultrasonic images by which it is possible to visually recognize at a glance the time-wise change of a blood flow.
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