期刊
MAGNETIC RESONANCE IN MEDICINE
卷 68, 期 1, 页码 241-251出版社
WILEY-BLACKWELL
DOI: 10.1002/mrm.23211
关键词
DCE MRI; glioma; vascular permeability; indicator pharmacokinetics
资金
- MRI Biomarkers of Response in Cerebral Tumors [R01 CA135329-01]
- MRI Measures of Blood Brain Barrier Permeability [RO1 HL70023-01A1]
Dynamic contrast enhanced T1-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 (Ktrans) and the reverse vascular transfer constant (kep). 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, vp was about four times that of white matter in the enhancing part of the tumor. Ktrans 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 R2 = 0.99). We conclude that the three parameters of the standard model are sufficient to fit dynamic contrast enhanced T1 data in glioblastoma under the conditions of the experiment. Magn Reson Med, 2012. (C) 2011 Wiley Periodicals, Inc.
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