title: Model selection for DCE-T1 studies in glioblastoma.
abstract: Dynamic contrast enhanced T(1)-weighted MRI using the contrast agent gadopentetate dimeglumine (Gd-DTPA) was performed on 10 patients with glioblastoma. Nested models with as many as three parameters were used to estimate plasma volume or plasma volume and forward vascular transfer constant (K(trans)) and the reverse vascular transfer constant (k(ep)). These constituted models 1, 2, and 3, respectively. Model 1 predominated in normal nonleaky brain tissue, showing little or no leakage of contrast agent. Model 3 predominated in regions associated with aggressive portions of the tumor, and model 2 bordered model 3 regions, showing leakage at reduced rates. In the patient sample, v(p) was about four times that of white matter in the enhancing part of the tumor. K(trans) varied by a factor of 10 between the model 2 (1.9 ↔ 10(-3) min(-1)) and model 3 regions (1.9 ↔ 10(-2) min(-1)). The mean calculated interstitial space (model 3) was 5.5%. In model 3 regions, excellent curve fits were obtained to summarize concentration-time data (mean R(2) = 0.99). We conclude that the three parameters of the standard model are sufficient to fit dynamic contrast enhanced T(1) data in glioblastoma under the conditions of the experiment.
authors: Department of Neurology, Henry Ford Hospital, Detroit, Michigan 48202, USA.
authors: Hassan
authors: H
authors: Bagher-Ebadian
authors: Rajan
authors: R
authors: Jain
authors: Siamak P
authors: SP
authors: Nejad-Davarani
authors: Tom
authors: T
authors: Mikkelsen
authors: Mei
authors: M
authors: Lu
authors: Quan
authors: Q
authors: Jiang
authors: Lisa
authors: L
authors: Scarpace
authors: Ali S
authors: AS
authors: Arbab
authors: Jayant
authors: J
authors: Narang
authors: Hamid
authors: H
authors: Soltanian-Zadeh
authors: Ramesh
authors: R
authors: Paudyal
authors: James R
authors: JR
authors: Ewing
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology*; D003198:Computer Simulation; D003287:Contrast Media / Q000493:pharmacokinetics; D005260:Female; D019786:Gadolinium DTPA / Q000097:blood / Q000493:pharmacokinetics*; D005909:Glioblastoma / Q000378:metabolism* / Q000473:pathology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014018:Tissue Distribution; D055815:Young Adult
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA