Title:
APPARATUS FOR ULTRASONIC DIAGNOSIS
Document Type and Number:
Japanese Patent JP3273914
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a highly sensitive Doppler-spectrum of good quality and with a small amount of crosstalk by settling a converter for coordinates of a focal point that converts the position of the coordinate of a focal point in calculation of delay time from the coordinates of a observation point.
SOLUTION: The converter for coordinates of a focal point operates only in each case that the coordinates of a observation point for Doppler signal exists deep inside an organism and also its deflection angle is small. The converter converts the depth into a shallower position while the deflection angle to the enter of the probe is fixed. When the coordinate of the part to be detected is point F, that is, the deflection angle to the center of the probe is 1° to the left and the depth is 200 mm, the difference of the delay time which should be given to an oscillator at the side of a transmitter is calculated that it is 19.2 nano minutes at most. If the depth of the part to be detected is converted by the converter into F' of which depth is 95 mm, the difference of time delay is calculated that it is 94.9 nano minutes at most, so the difference of phase can be broaden. As stated above, if the calculated coordination is converted into one with a small distance, the stoke should be lessen as the difference of delay time between each oscillator can be broaden.
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Inventors:
Yoshihiko Ito
Fuku Kita Hiroshi
Hagiwara Nao
Nishigaki Mori
Suzuki Takao
Fuku Kita Hiroshi
Hagiwara Nao
Nishigaki Mori
Suzuki Takao
Application Number:
JP2427798A
Publication Date:
April 15, 2002
Filing Date:
February 05, 1998
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
A61B8/06; A61B8/14; (IPC1-7): A61B8/06
Domestic Patent References:
| JP10155797A | ||||
| JP9299369A | ||||
| JP63242242A | ||||
| JP9238939A | ||||
| JP56130144A | ||||
| JP232810U |
Attorney, Agent or Firm:
Masahiro Kurai