. Author manuscript; available in PMC: 2015 Jan 8.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2008 Dec 10;74(3):781–789. doi: 10.1016/j.ijrobp.2008.08.053

Table 4.

Comparisons between CT-defined lung density-based and SPECT lung perfusion-based correlations with the changes in PFTs

	Methods	No. of tests	r	p-value	p-value^*
DLCO	SPECT-based	141	0.26	0.002	0.25
DLCO	CT-based	141	0.34	<0.001	0.25
FEV1	SPECT-based	141	0.33	<0.001	0.23
FEV1	CT-based	141	0.41	<0.001	0.23

Comparisons between correlation coefficients for CT- and SPECT-based comparisons

Abbreviations: SPECT = single photon emission computed tomography; CT = computed tomography; other abbreviations as in Table 2.