- Patent Title: Magnetic resonance imaging device and method for adjusting waveform of gradient magnetic field and measuring echo signals by applying the adjusted waveform to a pulse sequence
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Application No.: US15313983Application Date: 2015-05-19
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Publication No.: US10408901B2Publication Date: 2019-09-10
- Inventor: Yo Taniguchi , Toru Shirai , Hisaaki Ochi
- Applicant: Hitachi, Ltd.
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Mattingly & Malur, PC
- Priority: JP2014-118669 20140609
- International Application: PCT/JP2015/064361 WO 20150519
- International Announcement: WO2015/190244 WO 20151217
- Main IPC: G01R33/385
- IPC: G01R33/385 ; A61B5/055 ; G01R33/561 ; G01R33/28

Abstract:
Acoustic noise reduction is achieved in a high-speed imaging method such as a phase-compensation type GE sequence, which is not provided with sufficiently long intervals for applying the gradient magnetic field pulses. A band-stop filter is used to reduce components of a frequency band in the gradient magnetic field waveform, having a high sound pressure level being a source of sound, thereby performing the noise reduction. In general, when a band of the gradient magnetic field is reduced, the waveform is likely to be considerably distorted, failing to satisfy imaging conditions. Therefore, the distorted waveform is shaped so that the imaging conditions are satisfied. The sound pressure level of the gradient magnetic field waveform is calculated by using a response function inherent to the device.
Public/Granted literature
- US20170192068A1 MAGNETIC RESONANCE IMAGING DEVICE AND METHOD FOR ADJUSTING WAVEFORM OF GRADIENT MAGNETIC FIELD Public/Granted day:2017-07-06
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