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Nuclear magnetic resonance machine requiring long waiting time between pre-pulses and imaging pulse train

A nuclear magnetic resonance, pre-pulse technology, used in the measurement of magnetic variables, medical science, diagnosis, etc.

Inactive Publication Date: 2004-11-03
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] For this reason, as mentioned above, only images during diastole can be obtained in conventional methods

Method used

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  • Nuclear magnetic resonance machine requiring long waiting time between pre-pulses and imaging pulse train
  • Nuclear magnetic resonance machine requiring long waiting time between pre-pulses and imaging pulse train
  • Nuclear magnetic resonance machine requiring long waiting time between pre-pulses and imaging pulse train

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Embodiment Construction

[0036] Refer below Figure 4-6 and Figure 7A , 7B An embodiment of the present invention is described.

[0037] Figure 4 The structure of the nuclear magnetic resonance imaging apparatus of this embodiment is schematically shown.

[0038] The nuclear magnetic resonance imaging device includes: a lying part of the subject, on which the imaged object P (the imaged person) lies; a static magnetic field generating part for generating a static magnetic field; a gradient magnetic field generating part for It is used to add position signals to the static magnetic field; the sending / receiving part is used to send and receive high-frequency signals; the control and operation part is used to reliably control the whole system and image reconstruction; the electrocardiogram measurement part is used to measure as a representation an ECG (electrocardiogram) signal of a signal of the instantaneous phase of the heart of the imaging subject P; and a breath-hold command portion for instru...

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Abstract

In the black blood method using a double inversion pulse, images in the systole of the cardiac cycle can be captured in a reliable manner even in the presence of a cycle-to-cycle variance in the heart beat cycle. A pulse sequence of the black blood method composed of a double inversion pulse DIV and an imaging pulse train SEQima is used. This sequence is applied in sync with an ECG signal of a subject to be imaged, and magnetic resonance imaging is thereby performed. The double inversion DIV is applied in sync with an R-wave:R1 appearing on the ECG signal at a given timing, with a first delay time td1 (fixed value), and the imaging pulse train SEQima is applied in sync with the following R-wave:R2 with a second delay time td2 (fixed value: set in accordance with the systole). A variance of the cardiac cycle is absorbed in an inversion time BBTI.

Description

technical field [0001] The present invention relates to a nuclear magnetic resonance machine (MRI) for imaging the interior of an object with an imaging sequence comprising a pre-pulse, and more particularly to MR imaging using an imaging sequence in which after the pre-pulse is applied, the imaging sequence is started Like the pulse train, there is a waiting time, and this waiting time is longer than the cardiac cycle as in the black blood method and the like. Background technique [0002] At present, nuclear magnetic resonance imaging is widely used as a medical imaging method. Magnetic resonance imaging is an imaging method that uses a high-frequency signal at the Larmor frequency to induce magnetic excitation of nuclear spins in an object to be imaged in a static magnetic field, and then uses the excitation-correlated The resulting MR signals are used to reconstruct an image of the interior of the imaged object. NMR machines include various types and are distinguished ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/561G01R33/563G01R33/567
CPCA61B5/7285G01R33/56308G01R33/567A61B5/055G01R33/563
Inventor 金泽仁
Owner TOSHIBA MEDICAL SYST CORP
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