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Method, magnetic resonance apparatus and program to generate image using parallel acquisition technique

A technology, under-acquisition technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve problems such as inappropriateness and time-consuming, and achieve the effect of robust parallel image reconstruction

Inactive Publication Date: 2010-09-29
SIEMENS HEALTHCARE GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, known methods for determining coil calibration data are inappropriate and / or undesirably time-consuming for each sequence technique used for data acquisition

Method used

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  • Method, magnetic resonance apparatus and program to generate image using parallel acquisition technique
  • Method, magnetic resonance apparatus and program to generate image using parallel acquisition technique
  • Method, magnetic resonance apparatus and program to generate image using parallel acquisition technique

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Embodiment Construction

[0044] figure 1 The structure of the magnetic resonance system 1 with its main components is shown schematically. In order to examine the body by means of magnetic resonance imaging, different magnetic fields whose temporal and spatial characteristics are most precisely tuned to one another are irradiated onto the body.

[0045] A strong magnet, usually a low-temperature magnet 5 with a tunnel-shaped opening, arranged in a high-frequency shielded measuring chamber 3 generates a static, strong main magnetic field 7 of usually 0.2 Tesla to 7 Tesla and higher . An examination object to be examined, for example a patient (not shown here), is placed on a patient table 9 and positioned in the homogeneous region of the main magnetic field 7 .

[0046] The excitation of the nuclear spins in the examination object takes place by means of a magnetic radio-frequency excitation pulse, which is radiated via at least one radio-frequency coil, for example a radio-frequency antenna shown he...

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Abstract

A method of generating an imaging by using a parallel acquisition technique comprises the following steps: an excitation pulse is radiated into an examination subject; a first echo train is generated after the excitation pulse, wherein the first echo train densely scans a segment of k-space to be scanned for an acquisition of coil calibration data; coil calibration data are acquired by means of the first echo train; the acquired coil calibration data are stored in a coil calibration data set; a second echo train is generated after the same excitation pulse, wherein the second echo train undersamples a segment of k-space to be scanned for an acquisition of image data; image data are acquired by means of the second echo train; the acquired image data are stored in an incomplete image data set; and a first image data set is generated by substituting data missing in the incomplete image data set due to the undersampling by means of a selected PAT reconstruction technique using the coil calibration data.

Description

technical field [0001] The invention relates to a method, a magnetic resonance system and a computer program for creating an image by means of a parallel acquisition technique. Background technique [0002] Parallel acquisition techniques (in English "parallel acquisition techniques" - PAT) make it possible in magnetic resonance tomography (MRT) to underacquire the spatial frequency space (i.e. the so-called k-space) during data acquisition, i.e. measurement, which That is, the density of measured data points or data lines is lower than that required according to the Nyquist theory, and during image reconstruction, the missing data points are approximately calculated, usually the entire data line, or directly in the belonging image Spatial suppression of aliasing artifacts caused by underacquisition. As a result, the measurement time that must be spent to acquire the raw data can be significantly reduced. In addition, the typical artifacts that occur in certain application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/561G01R33/565
CPCG01R33/246G01R33/5611G01R33/4824G01R33/5616G01R33/443
Inventor 阿尔托·斯泰默
Owner SIEMENS HEALTHCARE GMBH
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