Comparison of fundamental and wideband harmonic contrast imaging of liver tumors.
Wideband harmonic imaging (with phase inversion for improved tissue suppression) was compared to fundamental imaging in vivo. Four woodchucks with naturally occurring liver tumors were injected with Imagent (Alliance Pharmaceutical Corp., San Diego, CA). Randomized combinations of dose (0.05, 0.2 and 0.4 ml/kg) and acoustic output power (AO; 5, 25 and 63% or MI < or = 0.9) were imaged in gray scale using a Sonoline Elegra scanner (Siemens Medical Systems, Issaquah, WA). Tumor vascularity, conspicuity and contrast enhancement were rated by three independent observers. Imagent produced marked tumor enhancement and improved depiction of neovascularity at all dosages and AO settings in both modes. Tumor vascularity and enhancement correlated with mode, dose and AO (P < 0.002). Fundamental imaging produced more enhancement (P < 0.05), but tumor vascularity and conspicuity were best appreciated in harmonic mode (P < 0.05). Under the conditions studied here, the best approach was wideband harmonic imaging with 0.2 ml/kg of Imagent at an AO of 25%.
Forsberg
F
F
Department of Radiology, Thomas Jefferson University, Philadelphia, PA 19107, USA. forsberg@esther.rad.tju.edu
Liu
J B
JB
Chiou
H J
HJ
Rawool
N M
NM
Parker
L
L
Goldberg
B B
BB
D000704:Analysis of Variance; D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000098:blood supply / Q000000981:diagnostic imaging*; D003287:Contrast Media; D005466:Fluorocarbons; D007091:Image Processing, Computer-Assisted; D008113:Liver Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging*; D008392:Marmota; D014463:Ultrasonography
D003287:Contrast Media; D005466:Fluorocarbons; C099091:Imagent US