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Experimental Studies |
1 From the Lawson Health Research Institute, St Joseph's Health Care London, London, Ontario, Canada (E.E.S., J.H., T.Y.L.); Department of Medical Biophysics, Faculty of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada (E.E.S., T.Y.L.); and Imaging Research Laboratories, Robarts Research Institute, 100 Perth Dr, London, ON, Canada N6A 5K8 (E.E.S., X.C., J.H., T.Y.L.). Received August 10, 2004; revision requested October 19; final revision received July 6, 2005; final version accepted August 1. Supported by the Canadian Institutes of Health Research. E.E.S. supported in part by GE Healthcare. Address correspondence to T.Y.L. (e-mail: tlee{at}imaging.robarts.ca).
Purpose: To prospectively determine the relationship between hepatic tumor blood flow and glucose utilization in vivo by using a combined positron emission tomographic (PET)/computed tomographic (CT) scanner.
Materials and Methods: The animal care and use subcommittee at the University of Western Ontario approved this study. VX2 carcinoma cells were implanted in the livers of eight male New Zealand white rabbits. Functional CT was performed before tumor implantation and every 4 days thereafter. Each examination consisted of two phases: In the first phase, 30-second cine breath-hold scanning was performed with simultaneous injection of 5 mL of contrast material. In the second phase, 4-second cine scanning was performed without breath holding every 10 seconds for 2 minutes. Second-phase CT images were coregistered with first-phase images to eliminate breathing artifacts. The weighted summation of the aortic and portal venous time-attenuation curves was deconvolved against curves from the liver to derive hepatic blood flow (HBF). Five animals underwent fluorine 18 fluorodeoxyglucose (FDG) scanning before and every 8 days after implantation. FDG uptake was measured as standardized uptake value (SUV). Data were analyzed with repeated-measures analysis of variance and the Tukey-Kramer multiple comparison test. Linear regression was used to compare SUV and HBF in tumors and normal tissue.
Results: In the hypovascular tumor core, (a) mean HBF decreased from 262 mL · min–1 · 100 g–1 ± 22 (standard deviation) at baseline to 101 mL · min–1 · 100 g–1 ± 62 at the end of the study (P < .05) and (b) mean SUV increased from 2.12 g/mL ± 0.06 to 4.56 g/mL ± 0.73 (P < .05) during the same period.
Conclusion: Functional CT in combination with FDG PET can be used to observe changes in HBF and glucose utilization in a growing liver tumor.
© RSNA, 2006
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