Title:
超音波診断装置
Document Type and Number:
Japanese Patent JP4796105
Kind Code:
B2
Abstract:
A technique for changing the frequency of a reference signal arbitrarily and realizing various types of high quality or high speed imaging is provided for digital ultrasonic diagnosis device utilizing a frequency change phasing method. Reception signals obtained by an array of ultrasonic vibrators are digitized at a sampling frequency higher than their Nyquist frequency, the reception signals are mixed with reference signals respectively, a plurality of samples of them are accumulated in a sampling direction and phased and added by a reception wave focusing means. The reference signals are successively read out of a memory means in order of sampling numbers and used. A reference signal sequence produced from signals whose frequencies are reduced with the lapse of time since the wave is transmitted or a reference signal sequence produced alternately from two signals having different frequencies are stored in the memory means.
Inventors:
Yuichi Sanwa
Ryuichi Shinomura
Shinichiro Umemura
Ryuichi Shinomura
Shinichiro Umemura
Application Number:
JP2008229807A
Publication Date:
October 19, 2011
Filing Date:
September 08, 2008
Export Citation:
Assignee:
Hitachi Medical Co., Ltd.
International Classes:
G01S7/52; A61B8/00
Domestic Patent References:
| JP6313764A | ||||
| JP8182680A |
Foreign References:
| US5581517 |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Kuniaki Shimizu
Hayashi Zouzo
Hajime Asamura
Kuniaki Shimizu
Hayashi Zouzo