Title:
NUCLEAR MAGNETIC RESONANCE IMAGING SYSTEM
Document Type and Number:
Japanese Patent JP3194794
Kind Code:
B2
Abstract:
PURPOSE: To provide the nuclear magnetic resonance imaging system which can suppress generation of a noise (percussion sound) from an inclined magnetic field coil in an examination period.
CONSTITUTION: A deciding part 112b decides whether an interval between a 90° pulse signal and a 180° pulse signal is longer than a prescribed time or not from a photographing condition set by an operating part 111. In the case it is shorten, an arithmetic part 112c denotes a rise/fall time of an inclined magnetic field as T1, and in the case it is longer, its time is denoted as T2 being longer than T1 and a generation timing of the inclined magnetic field is calculated. A setting part 112d sets T1(T2) as the rise/fall time of the inclined magnetic filed to an inclined magnetic field power source part 113. From the setting part 112d, a generation timing of a signal is supplied to a driving part 113b, and a power source 113a is driven. In the case the rise/fall time of the inclined magnetic field is T2, an inclined magnetic field signal is allowed to rise and fall slowly. Accordingly, electromagnetic force to an inclined magnetic field coil is suppressed, and a noise (percussion sound) from the inclined magnetic field coil is suppressed.
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Inventors:
Yoshiyuki Miyamoto
Tadashi Onihira
Tadashi Onihira
Application Number:
JP23951192A
Publication Date:
August 06, 2001
Filing Date:
September 08, 1992
Export Citation:
Assignee:
Hitachi Medical Co., Ltd.
International Classes:
G01R33/38; A61B5/055; G01R33/389; (IPC1-7): A61B5/055
Attorney, Agent or Firm:
Kasuga