Reducing scan time for calibration of through-time radial GRAPPA using PCA coil compression
نویسندگان
چکیده
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. Magn Reson Med. 2011; 65(2):492-505].
منابع مشابه
Evaluation of through-time radial GRAPPA for functional cardiac imaging in a patient population
Methods 63 patients scheduled for routine CMR examinations were scanned on a 1.5T Siemens Avanto scanner with 12-18 receiver coils in this IRB and HIPPA-compliant study. The gold-standard gated and breathheld shortaxis cardiac functional examination was performed for each patient with a temporal resolution between 31 and 62 ms, GRAPPA R = 2, and an in-plane resolution between 1.4-2.6 mm. Real-t...
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...
متن کاملGRAPPA-accelerated short axis BLADE EPI for multi-shot diffusion weighted imaging
Introduction: Artifacts in diffusion weighted EPI (DW-EPI) can be significantly reduced by increasing the speed with which k-space is traversed along the phaseencoding (PE) direction. The traverse speed can be increased through parallel acquisition techniques (PAT) [1] and by shortening the time between two successive samples in the PE direction (echo spacing ES). ES can be decreased through th...
متن کاملAccelerated 2D multi-slice first-pass contrast-enhanced myocardial perfusion using through-time radial GRAPPA
Background Non-Cartesian parallel imaging is a promising approach for reducing the scan time in multi-slice first-pass myocardial perfusion imaging, allowing increasing volumetric coverage in comparison with standard techniques. Through-time radial GRAPPA has previously been demonstrated for real-time functional cardiac imaging [Seiberlich, et al. MRM 2011 Feb;65 (2):492-505]. In this work, the...
متن کاملIterative Schemes to Solve Low-Dimensional Calibration Equations in Parallel MR Image Reconstruction with GRAPPA
GRAPPA (Generalized Autocalibrating Partially Parallel Acquisition) is a widely used parallel MRI reconstruction technique. The processing of data from multichannel receiver coils may increase the storage and computational requirements of GRAPPA reconstruction. Random projection on GRAPPA (RP-GRAPPA) uses random projection (RP) method to overcome the computational overheads of solving large lin...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره 17 شماره
صفحات -
تاریخ انتشار 2015