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Compressed sensing magnetic resonance imaging method controlled by radio-frequency pulse

A technology of magnetic resonance imaging and radio frequency pulses, which is applied in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, and measurement of magnetic variables. The effect of resonance imaging

Active Publication Date: 2013-04-10
XIAMEN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In a general magnetic resonance imaging system, the value of the linear magnetic field gradient generated by the shimming coil will be much smaller than the radio frequency pulse gradient, so the ability to adjust the k-space spread spectrum through the shimming gradient is limited

Method used

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  • Compressed sensing magnetic resonance imaging method controlled by radio-frequency pulse
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  • Compressed sensing magnetic resonance imaging method controlled by radio-frequency pulse

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Embodiment Construction

[0030] Lemons were imaged in this example using a Varian 7T (299.8 MHz) / 160-mm aperture MRI system. The sequence used in this embodiment is a random sampling multi-scan spin echo sequence ( figure 1 ). The experimental parameters are shown in Table 1:

[0031] Table 1

[0032] The excitation bandwidth ΔO of the linear frequency sweep pulse

ΔO=16kHz

The action time T of the linear frequency sweep pulse enco

T enco = 4ms

All phase decoding number N full

N full ＝256

Field of view L along the y-axis y

L y =80mm

Sequence repetition time TR

TR=1s

Serial echo time TE

TE=20ms

Acquisition rate SW

SW=50kHz

[0033] In the implementation process, you can adjust the excitation bandwidth ΔO or the excitation gradient size G enco To control the degree of k-space spreading.

[0034] The specific implementation process is as follows:

[0035] The first step: k-space spread spectrum by radio fr...

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Abstract

The invention discloses a compressed sensing magnetic resonance imaging method controlled by a radio-frequency pulse, and relates to the magnetic resonance imaging method. The invention provides the compressed sensing magnetic resonance imaging method controlled by the radio-frequency pulse, wherein the compressed sensing magnetic resonance imaging method controlled by the radio-frequency pulse is capable of controlling a space K to spread spectrum easily. The method includes the spectrum spreading to the space K from the radio-frequency pulse, undersampling at random and image reconstruction. In the magnetic resonance imaging, the radio-frequency pulse of linear frequency modulation is exerted along the phase encoding direction to control the energy diffusion of magnetic resonance imaging data space. The undersampling at random is carried out to the imaging data with spread spectrum, and sampling time is reduced. In terms of the undersampling data, suggested fast reconstruction algorithm is adopted to carry out sparse reconstruction to the imaging. Due to the fact that radio-frequency pulse sequence is utilized to carry out the spread spectrum of the space K, compared with space K with a shim coil, the controllable property of the spread spectrum of the space K is good. The purposes of reducing imaging time and accelerating the magnetic resonance imaging are achieved by adopting the methods of undersamping the magnetic resonance signal at random and the image reconstruction algorithm.

Description

technical field [0001] The invention relates to a magnetic resonance imaging method, in particular to a compressed sensing magnetic resonance imaging method controlled by radio frequency pulses, which utilizes compressed sensing technology and radio frequency pulses to accelerate the speed of magnetic resonance imaging. Background technique [0002] Magnetic resonance imaging is widely used in clinical diagnosis, but the slow imaging speed restricts some applications of magnetic resonance imaging. For example, slower imaging speeds can cause motion artifacts in MRIs such as the heart and abdomen, and reduce spatial resolution in fMRIs. In traditional magnetic resonance imaging, the collected magnetic resonance signals are called data space (also known as k-space). Reducing the amount of data in k-space can shorten imaging time and speed up MRI imaging. [0003] In 2006, Donoho (Donoho DL. Compressed sensing [J]. IEEE Transactions on Information Theory, 2006, 52(4): 1289-13...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/561G01R33/48
Inventor 屈小波颜志煜陈颖庄孝星郭迪陈忠
Owner XIAMEN UNIV
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