Title:
【発明の名称】超音波診断装置
Document Type and Number:
Japanese Patent JP3327129
Kind Code:
B2
Abstract:
A simple, compact and inexpensive ultrasonic wave diagnostic apparatus of electronic focus type in which the delay amount for controlling the phase of a transmission signal for each piezoelectric element is stored in a delay amount storage unit (1), the pulse width for controlling the frequency of the transmission signal for each piezoelectric element is stored in a pulse width storage unit (2), the time elapsed from a reference time point is counted by a counter (3), a change point of the transmission signal from the reference time point is calculated by a processor (4), the output of the processor is compared with the output of the counter by a comparator (5), a plurality of clocks having different phases are generated by a multiphase clock generator (6), a clock generated by the multiphase clock generator (6) is selected by a selective controller (7), and a pulse of the transmission signal is generated on the basis of the selected clock by a toggle circuit (8). The delay amount, the duty factor and the frequency of the transmission signal are controlled for each piezoelectric element to converge the ultrasonic wave beam, thereby making possible a highly accurate diagnosis with high image quality.
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Inventors:
Akiko Uchikawa
Hisashi Akiyama
Hisashi Akiyama
Application Number:
JP19190196A
Publication Date:
September 24, 2002
Filing Date:
July 22, 1996
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
A61B8/00; G01S15/89; G01N29/44; G10K11/34; (IPC1-7): A61B8/00; G01N29/22
Domestic Patent References:
| JP5670758A | ||||
| JP60103944A | ||||
| JP39736A | ||||
| JP6169916A | ||||
| JP8299335A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)