MRI field shift calculation using with zero-virtua
2016-08-23
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An efficient implementation of the Fourier-based procedure to calculate
the susceptibility-induced field-shift if an object with known
susceptibility distribution is placed within a strong homogeneous
magnetic field (B0).
The original procedure (k-space filtering by Salomir in 2003) needed zero-padding to prevent aliasing (circular wrap-around). In this implementation, however, aliasing is removed by estimating this artifact using an additional convolution in a lower resolution.
The method is very efficient since the aliasing-prevention is decoupled from the convolution of the Region Of Interest. We refer to this procedure as 'virtual Zero-Padding (vZP)'.
The article describing the principle of low resolution aliasing subtraction:
Job G. Bouwman, Chris J.G. Bakker. "Alias subtraction more efficient than conventional zero-padding in the Fourier based calculation of the susceptibility induced perturbation of the magnetic field in MR (20
The original procedure (k-space filtering by Salomir in 2003) needed zero-padding to prevent aliasing (circular wrap-around). In this implementation, however, aliasing is removed by estimating this artifact using an additional convolution in a lower resolution.
The method is very efficient since the aliasing-prevention is decoupled from the convolution of the Region Of Interest. We refer to this procedure as 'virtual Zero-Padding (vZP)'.
The article describing the principle of low resolution aliasing subtraction:
Job G. Bouwman, Chris J.G. Bakker. "Alias subtraction more efficient than conventional zero-padding in the Fourier based calculation of the susceptibility induced perturbation of the magnetic field in MR (20
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