Quantification of hepatic arterial and portal perfusion with dynamic computed tomography: comparison of maximum-slope and dual-input one-compartment model methods.
OBJECTIVE
The aim of this study was to compare the maximum-slope (MS) and dual-input one-compartment model (DOCM) methods in hepatic perfusion computed tomography (CT).


METHODS
A total of 37 patients with known or suspected liver disease underwent single-location dynamic CT after arterial or venous bolus injection of contrast material. Perfusion CT images were created by the MS (dividing the peak gradient of the time-attenuation curve by the peak vessel CT number) and DOCM-calculating from the equation dC ( L )(t)/dt = k ( a ) C ( a )(t - tau( a )) + k ( p ) C ( p )(t - tau( p )) - k ( v ) C ( L )(t)-methods. The perfusion parameters hepatic arterial perfusion (HAP), portal venous perfusion (PVP), and hepatic perfusion index (HPI) were determined.


RESULTS
The PVP of the tumor-free hepatic parenchyma determined by the MS method was lower than that obtained by the DOCM method (P < 0.001) with both injections. HAP determined by the MS method was lower than that obtained by the DOCM method with venous injection (P = 0.001), although there was no difference between the methods for HAP with arterial injection (P = 0.154). Most of the perfusion parameters showed linear correlations between the two analytical methods.


CONCLUSIONS
Except for HAP with arterial injection, the perfusion parameters obtained with the MS method were lower than those obtained with the DOCM method.
Miyazaki
Masaya
M
Department of Diagnostic and Interventional Radiology, Gunma University Graduate School of Medicine, Maebashi, 371-8511, Japan. miyazaki8612@polka.ocn.ne.jp
Tsushima
Yoshito
Y
Miyazaki
Akiko
A
Paudyal
Bishnuhari
B
Amanuma
Makoto
M
Endo
Keigo
K
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D006499:Hepatic Artery / Q000000981:diagnostic imaging*; D006801:Humans; D008107:Liver Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
D003287:Contrast Media