3 276

Cited 63 times in

Radial k-t FOCUSS for high-resolution cardiac cine MRI

Authors
 Hong Jung  ;  Jaeseok Park  ;  Jaeheung Yoo  ;  Jong Chul Ye 
Citation
 MAGNETIC RESONANCE IN MEDICINE, Vol.63(1) : 68-78, 2010 
Journal Title
 MAGNETIC RESONANCE IN MEDICINE 
ISSN
 0740-3194 
Issue Date
2010
MeSH
Algorithms* ; Heart/anatomy & histology* ; Image Enhancement/methods* ; Image Interpretation, Computer-Assisted/methods* ; Magnetic Resonance Imaging, Cine/instrumentation ; Magnetic Resonance Imaging, Cine/methods* ; Phantoms, Imaging ; Reproducibility of Results ; Sensitivity and Specificity ; Signal Processing, Computer-Assisted*
Keywords
radial trajectory ; dynamic MR imaging ; gridding method ; FOCUSS ; motion estimation and motion compensation ; residual encoding
Abstract
A compressed sensing dynamic MR technique called k-t FOCUSS (k-t FOCal Underdetermined System Solver) has been recently proposed. It outperforms the conventional k-t BLAST/SENSE (Broad-use Linear Acquisition Speed-up Technique/SENSitivity Encoding) technique by exploiting the sparsity of x-f signals. This paper applies this idea to radial trajectories for high-resolution cardiac cine imaging. Radial trajectories are more suitable for high-resolution dynamic MRI than Cartesian trajectories since there is smaller tradeoff between spatial resolution and number of views if streaking artifacts due to limited views can be resolved. As shown for Cartesian trajectories, k-t FOCUSS algorithm efficiently removes artifacts while preserving high temporal resolution. k-t FOCUSS algorithm applied to radial trajectories is expected to enhance dynamic MRI quality. Rather than using an explicit gridding method, which transforms radial k-space sampling data to Cartesian grid prior to applying k-t FOCUSS algorithms, we use implicit gridding during FOCUSS iterations to prevent k-space sampling errors from being propagated. In addition, motion estimation and motion compensation after the first FOCUSS iteration were used to further sparsify the residual image. By applying an additional k-t FOCUSS step to the residual image, improved resolution was achieved. In vivo experimental results show that this new method can provide high spatiotemporal resolution even from a very limited radial data set.
Full Text
http://onlinelibrary.wiley.com/doi/10.1002/mrm.22172/abstract
DOI
10.1002/mrm.22172
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Park, Jae Seok(박재석)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/100432
사서에게 알리기
  feedback

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse