Title:
MAGNETIC RESONANCE IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2008/004324
Kind Code:
A1
Abstract:
Provided is a magnetic resonance imaging device capable of performing a highly accurate
spectrum measurement even when resonance frequency is changed during MRS/MRSI
measurement. A pulse sequence for suppressing a water signal and an MRS pulse
sequence or an MRSI pulse sequence are continuously executed to perform MRS/MRSI
measurement accompanied by repeated measurement for signal accumulation or
repeated measurement for a phase code. Here, each time the measurement is repeated, a
signal SigO from the water is measured in the pulse sequence for suppressing the
water signal. When the water resonance frequency is deviated from an excitation band,
nucleus magnetization contained in water molecules is not excited and the water
signal intensity is reduced. Accordingly, by monitoring the change of the signal
SigO, it is possible to detect fluctuation of a magnetostatic field intensity.
When the water signal intensity is lowered than a predetermined value, it is judged
that the resonance frequency is shifted. A preparatory measurement is performed
to detect the water resonance frequency and corrections of various frequencies
are performed during repeated measurement.
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Inventors:
HIRATA SATOSHI (JP)
OCHI HISAAKI (JP)
OCHI HISAAKI (JP)
Application Number:
PCT/JP2006/325416
Publication Date:
January 10, 2008
Filing Date:
December 20, 2006
Export Citation:
Assignee:
HITACHI MEDICAL CORP (JP)
HIRATA SATOSHI (JP)
OCHI HISAAKI (JP)
HIRATA SATOSHI (JP)
OCHI HISAAKI (JP)
International Classes:
A61B5/055; G01R33/48
Domestic Patent References:
| WO2005000116A1 | 2005-01-06 | |||
| WO2006040866A1 | 2006-04-20 |
Foreign References:
| JP2004254884A | 2004-09-16 | |||
| JPH04102442A | 1992-04-03 |
Attorney, Agent or Firm:
TADA, Kimiko et al. (6-15 Kasumigaseki 3-chom, Chiyoda-ku Tokyo 13, JP)
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