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Mr imaging with b1mapping

An imaging sequence and pulse technology, applied in the field of computer programs, can solve the problems of increasing scanning time, increasing repetition time, etc., to achieve the effect of convenient acquisition scheme and lower SAR level

Inactive Publication Date: 2014-03-19
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the allowable repetition time is increased, thus increasing the scan time, and the method becomes prone to motion-induced artifacts

Method used

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  • Mr imaging with b1mapping
  • Mr imaging with b1mapping
  • Mr imaging with b1mapping

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Experimental program
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Embodiment Construction

[0046] refer to figure 1 , shows the MR device 1 . The device comprises a superconducting or normally conducting main magnet coil 2, thereby generating a substantially uniform, temporally constant main magnetic field B along the z-axis through the examination volume 0 . The device also comprises a set 2' of (first order, second order, and where appropriate third order) shim coils, wherein the current through the individual shim coils of said set 2' is controllable so that the examination volume B within 0 Bias minimized.

[0047] Magnetic resonance generation and manipulation systems apply a series of RF pulses and switched magnetic field gradients to invert or excite nuclear magnetic spins, induce magnetic resonance, refocus magnetic resonance, manipulate magnetic resonance, spatially and otherwise encode magnetic resonance, enable Spin saturation etc. to perform MR refocusing.

[0048] More specifically, the gradient pulse amplifier 3 applies current pulses to selected ...

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Abstract

The invention relates to a method of MR imaging, wherein a portion of a body is subjected to an imaging sequence of RF pulses and switched magnetic field gradients, which imaging sequence is a stimulated echo sequence including an off-resonant Bloch-Siegert RF pulse (BS) radiated during a preparation period (21) of the stimulated echo sequence. A B1 map is derived from the acquired stimulated echo MR signals. Moreover, the invention relates to a method of MR imaging, wherein a portion of a body is subjected to a first imaging sequence, which comprises a first composite excitation RF pulse consisting of two RF pulse components having essentially equal flip angles and being out of phase by essentially 90 DEG. Further, the portion of the body is subjected to a second imaging sequence, wherein a B1 map is derived from signal data acquired by means of the first and second imaging sequences.

Description

technical field [0001] The present invention relates to the field of magnetic resonance (MR) imaging. It relates to a method of MR imaging of at least a part of the body. The invention also relates to an MR device and a computer program running on the MR device. [0002] Currently, MR imaging methods are widely used, especially in the field of medical diagnosis, which utilize the interaction between magnetic fields and nuclear spins in order to form two-dimensional or three-dimensional images, because for soft tissue imaging, they are in many ways superior to other Imaging methods, which do not require ionizing radiation and are usually noninvasive. Background technique [0003] According to the general MR method, the body of the patient to be examined is placed in a strong uniform magnetic field (B 0 field), the direction of the magnetic field also defines the axis (usually the z-axis) of the coordinate system on which the measurement is based. The magnetic field genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/24
CPCG01R33/246G01R33/288
Inventor P·范德默伦P·博尔纳特K·内尔克
Owner KONINKLJIJKE PHILIPS NV
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