Algebraic Reconstruction Technique for Parallel Imaging Reconstruction of Undersampled Radial Data: Application to Cardiac Cine

作者：Li Shu; Chan Cheong; Stockmann Jason P; Tagare Hemant; Adluru Ganesh; Tam Leo K; Galiana Gigi; Constable R Todd; Kozerke Sebastian; Peters Dana C^*

来源：Magnetic Resonance in Medicine, 2015, 73(4): 1643-1653.

DOI：10.1002/mrm.25265

• radial
• projection reconstruction
• parallel imaging
• algebraic reconstruction technique
• cardiac function

PurposeTo investigate algebraic reconstruction technique (ART) for parallel imaging reconstruction of radial data, applied to accelerated cardiac cine.
MethodsA graphics processing unit (GPU)-accelerated ART reconstruction was implemented and applied to simulations, point spread functions and in 12 subjects imaged with radial cardiac cine acquisitions. Cine images were reconstructed with radial ART at multiple undersampling levels (192 N-r x N-p=96 to 16). Images were qualitatively and quantitatively analyzed for sharpness and artifacts, and compared to filtered back-projection, and conjugate gradient SENSE.
ResultsRadial ART provided reduced artifacts and mainly preserved spatial resolution, for both simulations and in vivo data. Artifacts were qualitatively and quantitatively less with ART than filtered back-projection using 48, 32, and 24 N-p, although filtered back-projection provided quantitatively sharper images at undersampling levels of 48-24 N-p (all P<0.05). Use of undersampled radial data for generating auto-calibrated coil-sensitivity profiles resulted in slightly reduced quality. ART was comparable to conjugate gradient SENSE. GPU-acceleration increased ART reconstruction speed 15-fold, with little impact on the images.
ConclusionGPU-accelerated ART is an alternative approach to image reconstruction for parallel radial MR imaging, providing reduced artifacts while mainly maintaining sharpness compared to filtered back-projection, as shown by its first application in cardiac studies. Magn Reson Med 73:1643-1653, 2015.

• 出版日期2015-4