Compressed Sensing for fMRI: Feasibility Study on the Acceleration of Non-EPI fMRI at 9.4T

Table 2

Reconstruction speed of FOCUSS algorithms on downsampled time-series data using of a representative rat.

	Algorithm 1		Algorithm 2
	Single FT-CG iteration	Total time	Covariance calculation	Single KLT-CG iteration	Total time
bSSFP PC2	0.46 s	41.35 s	27.81 s	0.64 s	77.26 s
GRE	0.24 s	21.29 s	14.27 s	0.29 s	34.98 s

FT: Fourier transform, CG: conjugate gradient method, and KLT: Karhunen-Loéve transform.
Calculated on PC (Windows 7), CPU: 3.30 GHz, RAM: 4.00 GB.