Elisa Dell’Oglio , MS, Antonia Ceccarelli , MD, PhD, Bonnie I Glanz , PhD, Brian C Healy , PhD, Shahamat Tauhid , MD, Ashish Arora , MD, Nikila Saravanan , Matthew J Bruha , BS, Alexander V Vartanian , Sheena L Dupuy , BA, Ralph HB Benedict , PhD 2 , Rohit Bakshi , MD, Mohit Neema , MD
18 December 2014
We tested the validity of a freely available segmentation pipeline to measure compartmental brain volumes from 3T MRI in patients with multiple sclerosis (MS). Our primary focus was methodological to explore the effect of segmentation corrections on the clinical relevance of the output metrics.
Three-dimensional T1-weighted images were acquired to compare 61 MS patients to 30 age- and gender-matched normal controls (NC). We also tested the within patient MRI relationship to disability (eg, expanded disability status scale [EDSS] score) and cognition. Statistical parametric mapping v. 8 (SPM8)-derived gray matter (GMF), white matter (WMF), and total brain parenchyma fractions (BPF) were derived before and after correcting errors from T1 hypointense MS lesions and/or ineffective deep GM contouring.
MS patients had lower GMF and BPF as compared to NC ( P<.05). Cognitively impaired patients had lower BPF than cognitively preserved patients ( P<.05). BPF was related to EDSS; BPF and GMF were related to disease duration (all P<.05). Errors caused bias in GMFs and WMFs but had no discernable influence on BPFs or any MRI-clinical associations.