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Phase contrast magnetic resonance flow velocity and flow rate measuring method and device

A flow velocity measurement and magnetic resonance technology, which is applied in the field of phase contrast magnetic resonance flow velocity, flow measurement and its measurement device, can solve the problems that errors cannot be completely eliminated

Active Publication Date: 2015-07-22
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

Although they have also proposed a method to reduce the error through the appropriate selection of echo time (TE) and readout bandwidth, they still cannot completely eliminate this error.

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  • Phase contrast magnetic resonance flow velocity and flow rate measuring method and device
  • Phase contrast magnetic resonance flow velocity and flow rate measuring method and device
  • Phase contrast magnetic resonance flow velocity and flow rate measuring method and device

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] figure 1 It is a schematic flow chart of phase contrast magnetic resonance flow velocity measurement in the present invention.

[0046] See figure 1 , the phase contrast magnetic resonance flow rate measurement method provided by the present invention comprises the following steps:

[0047] Step S101: Perform three different flow velocity encodings on the imaging sequence.

[0048] The imaging sequence may be any other imaging sequence combined with flow velocity encoding, such as gradient echo sequence, spin echo sequence, echo planar sequence or fast spin echo sequence. Taking the gradient echo sequence as an example, except for the selection of gradient field pulses for flow velocity encoding, the other parts are the same as the traditional gradient echo imaging sequence. Three different flow velocity encodings are achieved by changing the...

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Abstract

The invention discloses a phase contrast magnetic resonance flow velocity and flow rate measuring method and device. The method includes the following steps of firstly, conducting three different types of flow velocity encoding on an imaging sequence; secondly, obtaining one set of mixed k space data k12 and one set of mixed k space data k13 according to the imaging sequence; thirdly, converting the first set of mixed k space data k12 and the second set of mixed k space data k13 to an image domain to form an AC image and a DC image respectively; fourthly, calculating the flow velocity according to the AC image through the phase contrast. According to the phase contrast magnetic resonance flow velocity and flow rate measuring method and device, magnetic resonance signals corresponding to three different types of flow velocity encoding are collected alternately in the two mixed k spaces, a phase difference image is obtained according to signals derived from k space inter-line alternation, and therefore the blood flow velocity and blood flow rate can be accurately measured without being influenced by steady-state signals of fat.

Description

technical field [0001] The invention relates to a magnetic resonance flow velocity and flow measurement method and a measurement device thereof, in particular to a phase contrast magnetic resonance flow velocity and flow measurement method and a measurement device thereof. Background technique [0002] In magnetic resonance imaging, if the signal source flows along the direction of the gradient field, the measured signal phase will be related to the flow velocity of the fluid and the pulse shape of the gradient field. Based on this principle, the flow velocity and flow rate of the fluid can be measured by changing the phase of the magnetic resonance signal caused by changing the gradient field pulse shape. Details of this magnetic resonance technique for measuring flow rates can be found in Literature 1: [Pelc NJ, "Flow quantification and analysis methods", Magn Reson Imaging Clin N Am 3:413-424 (1995)]. [0003] Briefly, using two different gradient field pulse shapes for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055
Inventor 张卫国张树恒王超洪张强
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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