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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: Neurobiol Aging. 2014 Oct 7;36(0 1):S167–S177. doi: 10.1016/j.neurobiolaging.2014.05.039

Table 4.

Effects of MRI scan acceleration on changes detected at 6- and 12-month follow-up scan intervals: p-values from paired two-sample t-tests and correlation coefficients (r) comparing numerical summaries (% cumulative atrophy) from accelerated and nonaccelerated scans at each follow-up time-point. No difference was detected between scan types (all p>0.005), and, as expected, correlations (reported in the final column) were relatively high.

All Dx Cumulative Atrophy t-test p-value
6-month/12-month		 Correlation r
6-month/12-month
Stat ROI 0.2 / 0.02 0.71 / 0.81
Temporal ROI 0.78 / 0.11 0.65 / 0.71
 
AD Cumulative Atrophy
Stat ROI 0.32 / 0.57 0.72 / 0.89
Temporal ROI 0.54 / 0.5 0.46 / 0.69
 
EMCI Cumulative Atrophy
Stat ROI 0.49 / 0.08 0.68 / 0.84
Temporal ROI 0.38 / 0.43 0.68 / 0.78
 
LMCI Cumulative Atrophy
Stat ROI 0.75 / 0.32 0.71 / 0.81
Temporal ROI 0.81 / 0.77 0.63 / 0.76
 
CN Cumulative Atrophy
Stat ROI 0.19 / 0.08 0.63 / 0.62
Temporal ROI 0.7 / 0.08 0.69 / 0.58