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Multi-echo mr imaging with spiral acquisition

A spin echo, image technology, applied in the field of computer programs

Pending Publication Date: 2021-12-31
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the reconstructed MR image has no defined T 2 weighted

Method used

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  • Multi-echo mr imaging with spiral acquisition
  • Multi-echo mr imaging with spiral acquisition
  • Multi-echo mr imaging with spiral acquisition

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Embodiment Construction

[0027] refer to figure 1 , schematically shows the MR device 1 . The device comprises superconducting or resistive main magnet coils 2 such that a substantially uniform, temporally constant main magnetic field is created along the z-axis through the examination volume.

[0028] 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 encode magnetic resonance and otherwise encode magnetic resonance Resonance, saturating spins, etc. to perform MR imaging.

[0029] More specifically, the gradient pulse amplifier 3 applies current pulses to a selected one of the whole body gradient coils 4, 5 and 6 along the x-, y- and z-axes of the examination volume. A digital RF frequency transmitter 7 transmits RF pulses or pulse packets to a whole body volume RF coil 9 via a transmit / recei...

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Abstract

The invention relates to a method of MR imaging of an object (10) positioned in an examination volume of a MR device (1). It is an object of the invention to enable fast spiral MR imaging with a defined T2 contrast. The method of the invention comprises the following steps: - generating a number of spin echoes by subjecting the object (10) to one or 5 more shots of an imaging sequence, each shot comprising an RF excitation pulse (21) followed by a number of RF refocusing pulses (22), wherein modulated readout magnetic field gradients (23, 24) are applied in each interval between successive RF refocusing pulses (22), - acquiring MR signal data, wherein each spin echo is recorded along a spiral trajectory (31-33, 41-43) in k-space which winds around the k-space origin with varying radial distance, wherein the trajectory (31, 41) of at least one spin echo has a different rate of variation of the radial distance at least in a central k-space region compared to the trajectories (32, 33, 42, 43) of the other spin echoes, and - reconstructing an MR image from the acquired MR signal data. Moreover, the invention relates to an MR device (1) and to a computer program for an MR device (1).

Description

technical field [0001] The present invention relates to the field of magnetic resonance (MR) imaging. The present invention relates to a method of MR imaging of a subject. The invention also relates to an MR device and a computer program to be run on the MR device. Background technique [0002] Today, image-forming MR methods that utilize the interaction between magnetic fields and nuclear spins to form two-dimensional or three-dimensional images have been widely used, especially in the field of medical diagnosis, because they are more useful in soft tissue imaging than other imaging methods. Advantageous in many respects, they do not require ionizing radiation and are generally noninvasive. [0003] Usually, according to the MR method, an object (for example the body of a patient to be examined) is arranged in a strong and homogeneous magnetic field, the direction of which simultaneously defines the axis (usually the z-axis) of the coordinate system on which the measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/48G01R33/56
CPCG01R33/4824G01R33/5602
Inventor M·富德勒E·德维尔特
Owner KONINKLJIJKE PHILIPS NV
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