On analysis of k-t BLAST for dynamic MRI

k-t BLAST (Broad-use Linear Acquisition Speed-up Technique) is a popular means of improving imaging speed for dynamic MRI. The impact of several factors such as dealing DC(direct current) separately, the width of the temporal frequency band and the signal estimation capacity of the unaliasing formalisms are investigated. It is shown that the compactness of the temporal frequency representation is crucial to the performance of k-t BLAST. The accuracy of the priori information retrieved from the training data has only diminishing impact on reconstruction quality due to the inaccurate unaliasing equation. The estimation capacity of the unaliasing formalism is insufficient when the signal overlap is severe, and changing the unaliasing formalism accordingly may improve the reconstruction quality.