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Ultrasonic bloodstream diagnostic apparatus with dual displays of velocity profiles and average flow velocity
Ultrasonic bloodstream diagnostic apparatus with dual displays of velocity profiles and average flow velocity
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机译：具有速度曲线和平均流速双重显示的超声血流诊断仪
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摘要
Disclosed is an ultrasonic bloodstream diagnostic apparatus wherein the frequencies of Doppler shift ultrasound information are analyzed by a frequency analyzer to derive a power spectrum represented by N-bit data. Data compression technique is employed to convert the N-bit data to (M + L)-bit output data having M and L output bits. The M output bits respectively correspond to those of M bits in the N-bit data which are preceded by a series of K binary 0's, and the M output bits have a binary 1 in the most significant bit position thereof. The L output bits represent the least significant bit position of the M output bits with respect to the least significant bit position of the N-bit data, where K ranges from zero to N - M, and (M+L) is smaller than N. A microprocessor derives a signal representing the average frequency of the power spectrum from the (M + L)-bit output data. The (M + L)-bit output data is converted by a conversion memory to a form suitable for display by an algorithm which reconverts it to N-bits and nonlinearly compresses the latter by a logarithmic function.
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