T1 and T2 quantification using magnetic resonance fingerprinting in mild traumatic brain injury.

Abstract

To assess whether MR fingerprinting (MRF)-based relaxation properties exhibit cross-sectional and prospective correlations with patient outcome and compare the results with those from DTI. Clinical imaging, MRF, and DTI were acquired in patients (24 ± 10days after injury (timepoint 1) and 90 ± 17days after injury (timepoint 2)) and once in controls. Patient outcome was assessed with global functioning, symptom profile, and neuropsychological testing. ADC and fractional anisotropy (FA) from DTI and T1 and T2 from MRF were compared in 12gray and white matter regions with Mann-Whitney tests. Bivariate associations between MR measures and outcome were assessed using the Spearman correlation and logistic regression. Data from 22 patients (38 ± 12years; 17 women) and 18 controls (32 ± 8years; 12 women) were analyzed. Fourteen patients (37 ± 12years; 11 women) returned for timepoint 2, while two patients provided only timepoint 2 clinical outcome data. At timepoint 1, there were no differences between patients and controls in T1, T2, and ADC, while FA was lower in mTBI frontal white matter. T1 at timepoint 1 and the change in T1 exhibited more (n = 18) moderate to strong correlations (|r|= 0.6-0.85) with clinical outcome at timepoint 2 than T2 (n = 3), FA (n = 7), and ADC (n = 2). High T1 at timepoint 1, and serially increasing T1, accounted for five of the six MR measures with the highest utility for identification of non-recovered patients at timepoint 2 (AUC > 0.80). T1 derived from MRF was found to have higher utility than T2, FA, and ADC for predicting 3-month outcome after mTBI. • In a region-of-interest approach, FA, ADC, and T1 and T2 all showed limited utility in differentiating patients from controls at an average of 24 and 90days post-mild traumatic brain injury. • T1 at 24days, and the serial change in T1, revealed more and stronger predictive correlations with clinical outcome at 90days than did T2, ADC, or FA. • T1 showed better prospective identification of non-recovered patients at 90days than ADC, T2, and FA.