Determination of the maturity and functionality of tumor vasculature by MRI: correlation between BOLD-MRI and DCE-MRI using P792 in experimental fibrosarcoma tumors.
Using hypercapnia and carbogen as functional markers of vessel maturation and function, we compared blood oxygen level-dependent (BOLD) contrast with standard dynamic contrast-enhanced (DCE)-MRI quantitative parameters in murine fibrosarcoma. Our results show that there was no correlation between vessel maturity and contrast-agent uptake rate (K(in) (Trans)) or contrast agent efflux rate (k(ep)). In addition, DCE-MRI provided higher estimates of the fraction of functional tumor compared to BOLD-MRI. The two putative markers of regional vascular density, i.e., the magnitude of BOLD signal change during carbogen challenge (VF) and the fractional plasma volume found by DCE-MRI (V(p)), were only weakly correlated (r(2) = 0.02-0.14). Furthermore, VF showed no correlation with K(in) (Trans). A positive correlation was observed (r(2) = 0.75) between mean tumor VF and k(ep), but only when averaged over the whole tumor (which includes tumor regions completely unperfused by the gadolinium (Gd) contrast agent). This would merely reveal a relationship between perfusion status and the capacity to respond to carbogen breathing. In conclusion, characterizations of tumor microvasculature imaging using BOLD-MRI and DCE-MRI appear to be largely complementary, given the weak correlations between their corresponding derived parameters.
Baudelet
Christine
C
Laboratory of Biomedical Magnetic Resonance, Université Catholique de Louvain, Brussels, Belgium.
Cron
Gregory O
GO
Gallez
Bernard
B
D000818:Animals; D045744:Cell Line, Tumor; D003287:Contrast Media; D005354:Fibrosarcoma / Q000098:blood supply* / Q000175:diagnosis / Q000378:metabolism*; D006571:Heterocyclic Compounds; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D009389:Neovascularization, Pathologic / Q000175:diagnosis / Q000378:metabolism*; D009942:Organometallic Compounds; D010100:Oxygen / Q000378:metabolism*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013223:Statistics as Topic
D003287:Contrast Media; D006571:Heterocyclic Compounds; D009942:Organometallic Compounds; C435266:contrast agent P792; D010100:Oxygen