Self-calibration method for radial GRAPPA/k-t GRAPPA
نویسندگان
چکیده
منابع مشابه
A Rapid Self-Calibrating Radial GRAPPA method using Kernel Coefficient Interpolation
Introduction: A generalized autocalibrating partially parallel acquisition (GRAPPA) method for radial k-space sampling is presented that calculates kernel weights without acquiring or synthesizing calibration data [1-3] and without regridding to a Cartesian grid [4]. Methods: In the first step, GRAPPA kernels are calculated for datapoints k at radius r and angle θ. Neighboring datapoints ki fro...
متن کاملQuantitative g-factors for radial GRAPPA
Introduction: Recently, a theoretical framework for quantitative estimation of the non-uniform noise enhancement in GRAPPA reconstructions has been derived [1,2]. These works show that a GRAPPA g-factor can be calculated directly from the GRAPPA weights, which corresponds with the g-factor familiar in SENSE reconstructions [3]. In this work, we extend this concept to GRAPPA acquisitions where m...
متن کاملReducing scan time for calibration of through-time radial GRAPPA using PCA coil compression
Background Although using more coils may improve parallel imaging performance, it produces a burden on the amount of calibration data required for autocalibrating methods. This work investigates the use of principal component analysis (PCA) to project the original set of coils onto a smaller set of virtual coils to reduce calibration scan time for through-time radial GRAPPA [Seiberlich, et al. ...
متن کاملGRAPPA Operator for Wider RadiaL Band (GROWL)
Fig. 2 Comparison of in vivo gradient echo images using conventional regridding (top), GROWL reconstruction without (middle) and with (bottom) regularization. Reduction factor R is shown at the top-left corner of each panel, while numbers at the bottom-right corners are normalized error percentage from the gold-standard (R=1, 256 view) image. For GROWL, the number of parallel k-space lines with...
متن کاملImproved radial GRAPPA calibration for real-time free-breathing cardiac imaging.
To generate real-time, nongated, free-breathing cardiac images, the undersampled radial trajectory combined with parallel imaging in the form of radial GRAPPA has shown promise. However, this method starts to fail at high undersampling factors due to the assumptions that must be made for the purposes of calibrating the GRAPPA weight sets. In this manuscript, a novel through-time radial GRAPPA c...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2007
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.21233