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21. 发明专利

JPH09145695A ULTRASONIC SIGNAL PROCESSOR 失效
公开(公告)号：JPH09145695A
公开(公告)日：1997-06-06
申请号：JP30713595
申请日：1995-11-27
申请人： HITACHI MEDICAL CORP
发明人： SHINOMURA RYUICHI , MIWA YUICHI , MASUZAWA YUTAKA , KATAKURA KAGEYOSHI
IPC分类号： G01N29/44 , A61B8/00 , G01N29/22
摘要： PROBLEM TO BE SOLVED: To obtain an ultrasonic signal processor in which a circuit scale is reduced and by which a good digitized composite beam is formed by a method wherein, in the case of the frequency movement and phasing system of a digitized signal, a delay processing operation is performed, a frequency movement processing operation is then performed, a cumulative processing operation is performed, a phase-difference correction processing operation is performed and an addition processing operation in all channels is performed. SOLUTION: In a medical diagnosis or the like, respective received signals from a plurality of ultrasonic vibrators are processed such as amplified or the like, they are then A/D-converted by an ADCs 100, they are input to delay means 119 such as RAMs or the like so as to adjust a time difference up to every focus point. Signals from the means 119 are changed into signals having the central frequency of the ultrasonic received signals by first waveform correction means 101, and they are multiplied so as to be shifted to a baseband. Signals from the means 101 are bit- enhanced by cumulative means 102 each of which is constituted of a latch or an adder. Their S/N ratio is increased, and their phase difference is corrected by second waveform conversion means 118 each of which is constituted of a multiplier and an adder. The signals are added in all channels, a received beam is obtained, and a composite received beam at a small circuit scale can be formed by a time sharing operation.

22. 发明专利

JPH0919429A ULTRASONIC DIAGNOSING DEVICE 失效
公开(公告)号：JPH0919429A
公开(公告)日：1997-01-21
申请号：JP16864795
申请日：1995-07-04
申请人： HITACHI MEDICAL CORP
发明人： SHINOMURA RYUICHI , MASUZAWA YUTAKA
IPC分类号： G01B17/00 , A61B8/00 , G01N29/24 , G01S3/82 , G01S7/527 , G01S7/536
摘要： PROBLEM TO BE SOLVED: To form a satisfactory ultrasonic beam by detecting the center frequencies of received signals so as to take a deviation in time (corresponding to a depth) of center frequencies into consideration and control a delay or a phase process based upon the center frequency. SOLUTION: Arrayed ultrasonic vibrators 12 to a number of (n) receive signals with wave front arrival time difference from an objective focus point, and an amplifier 13 amplifies the received signals which are then digitized and are then delivered to a delaying part 10 where the wave fronts are aligned. Thereafter, they are added on an adder 11 so as to obtain an ultrasonic wave beam. Further, at this stage, in means 15 (15a to 15c) for obtaining a center frequency, center frequencies detected at respective received wave focusing stages, are delivered to a control part 16 which delivers focus date to a delaying part 10 or an A/D converter 1 so as to carry out delaying/phase-processing. With this arrangement, it is adjusted at the center frequency which varies with time in depending upon a depth, thereby affection upon the ultrasonic beam caused by a deviation of the ultrasonic waves is eliminated.

23. 发明专利

JPH08154931A ULTRASONIC DIAGNOSTIC APPARATUS 失效
公开(公告)号：JPH08154931A
公开(公告)日：1996-06-18
申请号：JP30585494
申请日：1994-12-09
申请人： HITACHI MEDICAL CORP
发明人： SHINOMURA RYUICHI , MASUZAWA YUTAKA , KANDA HIROSHI , KONDO SHINICHI
IPC分类号： G01N29/24 , A61B8/00
摘要： PURPOSE: To improve resolutions in the direction of a short axis without increasing the size of a transmitting/receiving circuit. CONSTITUTION: A transmitting/receiving circuit prepared for the apparatus to scan a one-dimensional array vibrator is divided and the one-dimensional array vibrator 1 is so arranged to be a two-dimensional array vibrator 1 divided in the direction of a short axis. The transmitting/receiving circuits 2-1 to 2-3 thus divided are allotted to vibrators divided in the short axis of the two-dimensional array vibrator 1 to determine a variable focus/caliber in the direction of the short axis. This allows the determining of the short-axis variable focus/ caliber without increasing the size of the transmitting/receiving circuits.

24. 发明专利

JPH0712785A ULTRASONIC SIGNAL PROCESSING DEVICE 失效
公开(公告)号：JPH0712785A
公开(公告)日：1995-01-17
申请号：JP15023093
申请日：1993-06-22
申请人： HITACHI MEDICAL CORP
发明人： MASUZAWA YUTAKA , SHINOMURA RYUICHI , MIWA YUICHI , KATAKURA KAGEYOSHI
IPC分类号： A61B8/00 , G01N29/22 , G01N29/44
摘要： PURPOSE:To perform the highly precise digital phasing processing of an ultrasonic device at low cost. CONSTITUTION:A device is supplied with an input signal obtainable when a reflected wave having a central angle frequency omega reaches a receiver element having an element number (n) after the elapse of a propagation time taun. Then, when the standardized period of an input signal processing system is Ts and the time taun is quantized with Ts, the phases of the carriers are aligned with each other because of a phase difference due to the time taun among receiver elements, provided that the carriers or waves are made to travel along a time axis having a unit of Ts via delay circuits 11 to 1m. Then, for integrating the waveforms of all receiver elements, complex multipliers 21 to 2m are used to make correction for the phase terms of the carriers. Also, real and complex parts are added in adders 31 and 32, thereby enabling a filter circuit to be used in common via a plurality of input signals.

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