Journal of Nuclear Medicine | |
Tumor Blood Flow Measured by PET Dynamic Imaging of First-Pass 18F-FDG Uptake: A Comparison with 15O-Labeled Water-Measured Blood Flow | |
James L. Abbruzzese1  Bruce J. Barron1  Roger G. O'Neil1  Roy S. Herbst1  Nizar A. Mullani1  K. Lance Gould1  | |
关键词: PET; 18F-FDG; tumor; perfusion; blood flow; 15O; molecular imaging; | |
DOI : 10.2967/jnumed.107.048504 | |
学科分类:医学(综合) | |
来源: Society of Nuclear Medicine | |
【 摘 要 】
PET molecular imaging of 15O-labeled water is the gold standard for measuring blood flow in humans. However, this requires an on-site cyclotron to produce the short-lived 15O tracer, which is cost-prohibitive for most clinical PET centers. The purpose of this study was to determine if the early uptake of 18F-FDG could be used to measure regional blood flow in tumors in the absence of 15O-water. Methods: PET scans were obtained in patients being evaluated for tumor perfusion and glucose metabolism in a phase I dose-escalating protocol for endostatin, a novel antiangiogenic agent. A 2-min perfusion scan was performed with a bolus injection of 2,220 MBq (60 mCi) of 15O-water, which was followed by a 370-MBq (10 mCi) dose of 18F-FDG. Four sequential scans of 18F-FDG uptake were acquired, consisting of an early 2-min uptake scanor first-pass scanand 3 sequential 15-min late 18F-FDG uptake scans. Regions of interest (ROIs) were drawn on 2 or more tumor sites and on back muscle, as a control ROI, for each patient. Arterial blood concentration was derived from the PET scans by drawing an ROI over a large artery in the field of view. Blood flow was computed with a simple 1-compartment blood flow model using the first 2 min of data after injection. Results: Blood flow estimated from the early uptake of 18F-FDG was linearly correlated with 15O-measured blood flow, with an intercept of 0.01, a slope of 0.86, and an R2 regression coefficient of 0.74 (r = 0.86). The 18F-FDG tumor extraction fraction relative to 15O-water averaged 0.86. A preliminary case study of a patient with prostate cancer confirms the utility of the first-pass 18F-FDG blood flow analysis in tumor diagnosis. Conclusion: These results suggest that the first-pass uptake of 18F-FDG may provide an estimate of perfusion in a tumor within the limitations of incomplete extraction of 18F-FDG compared with 15O-water.
【 授权许可】
Unknown
【 预 览 】
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