Highly constrained backprojection for time-resolved MRI Export

@article{HYPR, abstract = {Recent work in k-t BLAST and undersampled projection angiography has emphasized the value of using training data sets obtained during the acquisition of a series of images. These techniques have used iterative algorithms guided by the training set information to reconstruct time frames sampled at well below the Nyquist limit. We present here a simple non-iterative unfiltered backprojection algorithm that incorporates the idea of a composite image consisting of portions or all of the acquired data to constrain the backprojection process. This significantly reduces streak artifacts and increases the overall SNR, permitting decreased numbers of projections to be used when acquiring each image in the image time series. For undersampled 2D projection imaging applications, such as cine phase contrast (PC) angiography, our results suggest that the angular undersampling factor, relative to Nyquist requirements, can be increased from the present factor of 4 to about 100 while increasing SNR per individual time frame. Results are presented for a contrast-enhanced PR HYPR TRICKS acquisition in a volunteer using an angular undersampling factor of 75 and a TRICKS temporal undersampling factor of 3 for an overall undersampling factor of 225. Magn Reson Med, 2006. {\copyright} 2005 Wiley-Liss, Inc.}, address = {Department of Medical Physics, The University of Wisconsin-Madison, Madison, WI, USA; Department of Radiology, The University of Wisconsin-Madison, Madison, WI, USA; Department of Biomedical Engineering, The University of Wisconsin-Madison, Madison, WI, USA}, author = {Mistretta, C. A. and Wieben, O. and Velikina, J. and Block, W. and Perry, J. and Wu, Y. and Johnson, K. and Wu, Y.}, citeulike-article-id = {3199484}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.20772}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/112205907/ABSTRACT}, doi = {10.1002/mrm.20772}, journal = {Magnetic Resonance in Medicine}, keywords = {2006, fast, hypr, mrm, reconstruction, speed-up}, number = {1}, pages = {30--40}, posted-at = {2008-09-06 11:44:53}, priority = {0}, title = {Highly constrained backprojection for time-resolved MRI}, url = {http://dx.doi.org/10.1002/mrm.20772}, volume = {55}, year = {2006} }

TY - JOUR ID - HYPR L3 - citeulike-article-id:3199484 N2 - Recent work in k-t BLAST and undersampled projection angiography has emphasized the value of using training data sets obtained during the acquisition of a series of images. These techniques have used iterative algorithms guided by the training set information to reconstruct time frames sampled at well below the Nyquist limit. We present here a simple non-iterative unfiltered backprojection algorithm that incorporates the idea of a composite image consisting of portions or all of the acquired data to constrain the backprojection process. This significantly reduces streak artifacts and increases the overall SNR, permitting decreased numbers of projections to be used when acquiring each image in the image time series. For undersampled 2D projection imaging applications, such as cine phase contrast (PC) angiography, our results suggest that the angular undersampling factor, relative to Nyquist requirements, can be increased from the present factor of 4 to about 100 while increasing SNR per individual time frame. Results are presented for a contrast-enhanced PR HYPR TRICKS acquisition in a volunteer using an angular undersampling factor of 75 and a TRICKS temporal undersampling factor of 3 for an overall undersampling factor of 225. Magn Reson Med, 2006. © 2005 Wiley-Liss, Inc. IS - 1 JF - Magnetic Resonance in Medicine AD - Department of Medical Physics, The University of Wisconsin-Madison, Madison, WI, USA; Department of Radiology, The University of Wisconsin-Madison, Madison, WI, USA; Department of Biomedical Engineering, The University of Wisconsin-Madison, Madison, WI, USA EP - 40 TI - Highly constrained backprojection for time-resolved MRI VL - 55 SP - 30 KW - 2006 KW - fast KW - hypr KW - mrm KW - reconstruction KW - speed-up AU - Mistretta, CA AU - Wieben, O AU - Velikina, J AU - Block, W AU - Perry, J AU - Wu, Y AU - Johnson, K AU - Wu, Y PY - 2006/// UR - http://dx.doi.org/10.1002/mrm.20772 ER -