Title :
Parallel MR Imaging with Accelerations Beyond the Number of Receiver Channels Using Real Image Reconstruction
Author :
Ji, Jim X. ; Wright, Steven M.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX
Abstract :
Parallel imaging using multiple phased-array coils and receiver channels has become an effective approach to high-speed magnetic resonance imaging (MRI). To obtain high spatiotemporal resolution, the k-space is subsampled and later interpolated using multiple channel data. Higher subsampling factors result in faster image acquisition. However, the subsampling factors are upper-bounded by the number of parallel channels. Phase constraints have been previously proposed to overcome this limitation with some success. In this paper, we demonstrate that in certain applications it is possible to obtain acceleration factors potentially up to twice the channel numbers by using a real image constraint. Data acquisition and processing methods to manipulate and estimate of the image phase information are presented for improving image reconstruction. In-vivo brain MRI experimental results show that accelerations up to 6 are feasible with 4-channel data
Keywords :
biomedical MRI; data acquisition; image reconstruction; medical image processing; acceleration factors; data acquisition; image constraint; image phase information; image reconstruction; in-vivo brain MRI; magnetic resonance imaging; multiple phased-array coils; parallel MR imaging; parallel channels; receiver channels; spatiotemporal resolution; subsampling; Acceleration; Coils; Data acquisition; High-resolution imaging; Image reconstruction; Laboratories; Magnetic resonance; Magnetic resonance imaging; Phase estimation; Spatiotemporal phenomena; MRI; constrained image reconstruction; parallel imaging; phased-array imaging; rapid imaging;
Conference_Titel :
Engineering in Medicine and Biology Society, 2005. IEEE-EMBS 2005. 27th Annual International Conference of the
Conference_Location :
Shanghai
Print_ISBN :
0-7803-8741-4
DOI :
10.1109/IEMBS.2005.1616519