. 2018 Sep 26;31(5):298–310. doi: 10.1089/jamp.2017.1403

Table 2.

Mean and Coefficient of Variation of the Peripheral-To-Central Count Ratio Values Without and With Attenuation Correction for Manual Region of Interest and Computer-Assisted Box Regions of Interest

Variable	P/C_(mROI)	P/C_(bROI)	p^a
Mean ± SD (without attenuation correction)	2.1044 ± 0.4409	1.238 ± 0.29	<0.001
Mean ± SD (with attenuation correction)	1.2333 ± 0.2901	1.1280 ± 0.2265	<0.001
COV	0.10 ± 0.04	0.064 ± 0.029	<0.001

^{^a}

Test t/values are mean ± SD.

bROI, rectangular box for central ROI; COV, coefficient of variation; mROI, manual region of interest; P/C, peripheral-to-central counts ratio.