期刊
MAGNETIC RESONANCE IN MEDICINE
卷 62, 期 3, 页码 706-716出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.22052
关键词
k-t BLAST/SENSE; parallel imaging; principal component analysis
资金
- Philips Medical Systems
- University of Aarhus Graduate School of Health Sciences
- Danish Agency for Science, Technology and Innovation
The k-t broad-use linear acquisition speed-up technique (BLAST) has become widespread for reducing image acquisition time in dynamic MRI. In its basic form k-t BLAST speeds up the data acquisition by undersampling k-space over time (referred to as k-t space). The resulting aliasing is resolved in the Fourier reciprocal x-f space (x = spatial position, f = temporal frequency) using an adaptive filter derived from a low-resolution estimate of the signal covariance. However, this filtering process tends to increase the reconstruction error or lower the achievable acceleration factor. This is problematic in applications exhibiting a broad range of temporal frequencies such as free-breathing myocardial perfusion imaging. We show that temporal basis functions calculated by subjecting the training data to principal component analysis (PCA) can be used to constrain the reconstruction such that the temporal resolution is improved. The presented method is called k-t PCA. Magn Reson Med 62:706-716, 2009. (C) 2009 Wiley-Liss, Inc.
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