title: Estimating Intracranial Volume in Brain Research: An Evaluation of Methods.
abstract: Intracranial volume (ICV) is a standard measure often used in morphometric analyses to correct for head size in brain studies. Inaccurate ICV estimation could introduce bias in the outcome. The current study provides a decision aid in defining protocols for ICV estimation across different subject groups in terms of sampling frequencies that can be optimally used on the volumetric MRI data, and type of software most suitable for use in estimating the ICV measure. Four groups of 53 subjects are considered, including adult controls (AC, adults with Alzheimer's disease (AD), pediatric controls (PC) and group of pediatric epilepsy subjects (PE). Reference measurements were calculated for each subject by manually tracing intracranial cavity without sub-sampling. The reliability of reference measurements were assured through intra- and inter- variation analyses. Three publicly well-known software packages (FreeSurfer Ver. 5.3.0, FSL Ver. 5.0, SPM8 and SPM12) were examined in their ability to automatically estimate ICV across the groups. Results on sub-sampling studies with a 95 % confidence showed that in order to keep the accuracy of the inter-leaved slice sampling protocol above 99 %, sampling period cannot exceed 20 mm for AC, 25 mm for PC, 15 mm for AD and 17 mm for the PE groups. The study assumes a priori knowledge about the population under study into the automated ICV estimation. Tuning of the parameters in FSL and the use of proper atlas in SPM showed significant reduction in the systematic bias and the error in ICV estimation via these automated tools. SPM12 with the use of pediatric template is found to be a more suitable candidate for PE group. SPM12 and FSL subjected to tuning are the more appropriate tools for the PC group. The random error is minimized for FS in AD group and SPM8 showed less systematic bias. Across the AC group, both SPM12 and FS performed well but SPM12 reported lesser amount of systematic bias.
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA.
authors.forename: Saman
authors.initials: S
authors.lastname: Sargolzaei
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA.
authors.forename: Arman
authors.initials: A
authors.lastname: Sargolzaei
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Cabrerizo
authors.affiliation: Scientific and Statistical Computing Core, NIMH/NIH/HHS, Bethesda, MD, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Goryawala
authors.affiliation: Baptist Health Neuroscience Center, Baptist Hospital, Miami, FL, USA.
authors.forename: Alberto
authors.initials: A
authors.lastname: Pinzon-Ardila
authors.affiliation: Baptist Health Neuroscience Center, Baptist Hospital, Miami, FL, USA.|Department of Neuroscience, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, USA.
authors.forename: Sergio M
authors.initials: SM
authors.lastname: Gonzalez-Arias
authors.affiliation: Department of Electrical and Computer Engineering, Florida International University, Miami, FL, USA. adjouadi@fiu.edu.|Department of Biomedical Engineering, Florida International University, Miami, FL, USA. adjouadi@fiu.edu.|, 10555W. Flagler St, ECE 2220, Miami, FL, 33174, USA. adjouadi@fiu.edu.
authors.forename: Malek
authors.initials: M
authors.lastname: Adjouadi
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000473:pathology*; D001921:Brain / Q000033:anatomy & histology*; D001931:Brain Mapping; D002648:Child; D004827:Epilepsy / Q000473:pathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results
keywords: FSL (RRID:nif-0000-00305); FreeSurfer (RRID:nif-0000-00304); Intracranial volume estimation; MRI; SPM (RRID:nif-0000-00343)
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