Method for correcting echo wave plane imaging sequence
An imaging sequence and echo plane technology, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic variable measurement, scientific instruments, etc., can solve the problems of longer echo interval time, waste of scanning time, image deformation, etc., to achieve The effect of saving scanning time and increasing accuracy
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[0015] The method of the invention adopts a new phase correction method, and uses the image itself to obtain a phase map reflecting the inhomogeneity of the magnetic field to correct the deformation of the image.
[0016] Such as figure 2 As shown, the readout gradient of the pulse sequence adopted by the present invention adopts a bipolar readout method as shown in label 8, that is, a double-echo EPI sequence. This sequence collects two images of the same level, and the images collected are not simply phased. Instead, the phase difference information is used to correct the distortion of the image. The readout gradient used for phase correction is shown in label 7. A total of 4 echo signals without phase encoding are collected, and the echo signals for phase correction collected with the same gradient polarity are used to correct odd-numbered and even-numbered echoes respectively. Wave image data.
[0017] The echo signal model for phase correction assuming homopolar readou...
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