Abstract:
PURPOSE:To evaluate the correlation between quantitative dual energy CT and perfusion CT measurements in rabbit VX2 liver tumors. MATERIALS AND METHODS:This study was approved by the institutional animal care and use committee at our institution. Nine rabbits with VX2 liver tumors underwent contrast-enhanced dual energy CT and perfusion CT. CT attenuation for the tumors and normal liver parenchyma and tumor-to-liver ratio were obtained at the 140kVp, 80kVp, average weighted images and dual energy CT iodine maps. Quantitative parameters for the viable tumor and adjacent liver were measured with perfusion CT. The correlation between the enhancement values of the tumor in iodine maps and perfusion CT parameters of each tumor was analyzed. Radiation dose from dual energy CT and perfusion CT was measured. RESULTS:Enhancement values for the tumor were higher than that for normal liver parenchyma at the hepatic arterial phase (P<0.05). The highest tumor-to-liver ratio was obtained in hepatic arterial phase iodine map. Hepatic blood flow of the tumor was higher than that for adjacent liver (P<0.05). Enhancement values of hepatic tumors in the iodine maps positively correlated with permeability of capillary vessel surface (r=0.913, P<0.001), hepatic blood flow (r=0.512, P=0.010), and hepatic blood volume (r=0.464, P=0.022) at the hepatic arterial phases. The effective radiation dose from perfusion CT was higher than that from DECT (P<0.001). CONCLUSIONS:The enhancement values for viable tumor tissues measured in iodine maps were well correlated to perfusion CT measurements in rabbit VX2 liver tumors. Compared with perfusion CT, dual energy CT of the liver required a lower radiation dose.
journal_name
Eur J Radioljournal_title
European journal of radiologyauthors
Zhang LJ,Wu S,Wang M,Lu L,Chen B,Jin L,Wang J,Larson AC,Lu GMdoi
10.1016/j.ejrad.2011.06.057subject
Has Abstractpub_date
2012-08-01 00:00:00pages
1766-75issue
8eissn
0720-048Xissn
1872-7727pii
S0720-048X(11)00599-7journal_volume
81pub_type
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