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MRI apparatus

A component and flip angle technology, applied in medical science, diagnosis, measurement of magnetic variables, etc., can solve the problems of inseparable display of hydrogen nucleus density, difficulty in clearly distinguishing bone and ligament tissue, etc.

Active Publication Date: 2009-04-08
TOSHIBA MEDICAL SYST CORP
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Problems solved by technology

Therefore, it is difficult to clearly distinguish between bone and ligament tissue
[0011] Thus, in MRI imaging using the conventional fat signal suppression method, there is a problem that it is impossible to separately display tissues with low hydrogen nuclei density or to collect small MR signals based on the relationship between relaxation time and pulse sequence. Tissues and tissues with a high fat content

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Embodiment Construction

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0030] In the embodiments of the present invention described below, first, the flip angle of the fat suppression pulse is set according to the imaging conditions of MRI imaging using the fat signal suppression method and the degree of fat suppression. Next, in the fat suppression sequence aimed at suppressing the MR signal (hereinafter referred to as the fat signal) generated from the fat tissue, irradiation and disturbance of the fat suppression pulse having the above-mentioned flip angle are performed on the imaging target part of the subject. The application of the gradient magnetic field of the detector suppresses the fat signal to the desired size. Next, in the MR signal acquisition sequence subsequent to the fat suppression sequence, RF pulse irradiation and ramp magnetic field application are performed on the above-mentioned imaging target site according to a pre...

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Abstract

The present invention provides a MRI device, wherein, a flip-angle calculating unit calculates a flip angle of a fat-suppression pulse by inputting scanning parameters read from a scanning-parameter storage unit based on scanning conditions set by a scan-condition setting unit and a desired fat-suppression level, into a predetermined computing program. A control unit suppresses fat signals to a desired level by performing irradiation of a fat-suppression pulse having the calculated flip angle and application of a spoiler gradient magnetic field onto a scan target portion of a subject by controlling a gradient magnetic-field generating unit and a transmitting-receiving unit, and further performs irradiation of an RF pulse and application of a gradient magnetic field in accordance with a predetermined pulse sequence, thereby detecting water signals and suppressed fat signals as MR signals. An image-data creating unit creates image data by reconstructing the MR signals.

Description

[0001] Cross References to Related Applications [0002] This application enjoys the benefit of priority of Japanese Patent Application No. 2007-261360 filed on October 4, 2007 and Japanese Patent Application No. 2008-212455 filed on August 21, 2008, and cites the entire content of the above Japanese Patent Application. technical field [0003] The present invention relates to an MRI apparatus, and more particularly to an MRI apparatus for suppressing MR signals generated from adipose tissue by applying a fat signal suppression method. Background technique [0004] Magnetic resonance imaging (MRI) uses a frequency signal (RF pulse) with its Larmor frequency to excite the nuclear spin (spin) of an object placed in a static magnetic field. An imaging method in which magnetic resonance signals (MR signals) generate image data. [0005] An MRI device is an image diagnostic device that generates image data based on MR signals detected in a living body. It can obtain not only ana...

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Application Information

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IPC IPC(8): A61B5/055G01R33/48
Inventor 杉浦聪
Owner TOSHIBA MEDICAL SYST CORP
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