Correlation of the CBF values between CTP and SPECT

CBF	AIF Unaffected Side			AIF Affected Side
	Unaffected Side	Affected Side	Ratio	Unaffected Side	Affected Side	Ratio
bSVD
r2	0.58*	0.46†	0.70‡	0.44	0.36	0.60*
ICC	−0.31	−0.42	0.64‡	−0.22	−0.30	0.58*
sSVD
r2	0.52†	0.22	0.50†	0.46†	0.08	0.40
ICC	0.25	−0.36	0.02	0.43†	0.02	0.03
bMTF
r2	0.40	0.25	0.57*	0.22	0.22	0.11
ICC	0.21	0.26	−0.04	−0.31	−0.30	−0.23

Note:—CBF indicates cerebral blood flow; CTP, CT perfusion; SPECT, single-photon emission CT; AIF, arterial input function; bSVD, block-circulant singular value decomposition; SSVD, standard SVD; bMTF, box-modulation transfer function: ICC, intraclass correlation coefficient.

^*P < .01.

^†P < .05.

^‡P < .001.