Comparing dynamic parameters of tumor vascularization in nude mice revealed by magnetic resonance imaging and contrast-enhanced intermittent power Doppler sonography.
BACKGROUND
Angiogenesis is essential for spread and growth of malignant tumors. Because noninvasive methods for observing tumor vascularization are limited, most of previous results were based on histologic findings alone. In this study, dynamic parameters obtained using intermittent contrast-enhanced Doppler sonography and dynamic MRI were compared and correlated with microvessel density.


METHODS
Eleven tumor-bearing nude mice were examined with dynamic T(1)-weighted sequences using Gd-DTPA in a 1.5 T magnetic resonance (MR) scanner and with intermittent power Doppler sonography after a single bolus of galactose based contrast agent. After examination 6 tumors were harvested for immunofluorescence microscopy using a CD31 stain. Using a 2-compartment model, the MR parameters amplitude (reflecting plasma volume) and k(ep) (influenced by the vessel permeability) were calculated and compared with maximal enhancement (max) and perfusion P measured with ultrasound.


RESULTS
The MR amplitude correlated with the ultrasound parameter max significantly (r = 0.61; P = 0.01). Max (r = 0.67; P = 0.01), amplitude (r = 0.72; P = 0.01), and perfusion (r = 0.62; P = 0.05) correlated with the microvessel density. k(ep) moderately correlated with max, but not with perfusion and microvessel density.


CONCLUSIONS
Dynamic MRI and contrast enhanced ultrasound are supplementing methods for examining perfusion and vascularity of experimental tumors.
Kiessling
Fabian
F
Division of Oncological Diagnostics and Therapy, German Cancer Research Center, Heidelberg, Germany. F.Kiessling@dkfz.de
Krix
Martin
M
Heilmann
Melanie
M
Vosseler
Silvia
S
Lichy
Matthias
M
Fink
Christian
C
Farhan
Nabeel
N
Kleinschmidt
Katharina
K
Schad
Lothar
L
Fusenig
Norbert E
NE
Delorme
Stefan
S
D000818:Animals; D003287:Contrast Media / Q000008:administration & dosage; D019786:Gadolinium DTPA / Q000008:administration & dosage; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D051379:Mice; D008819:Mice, Nude; D009369:Neoplasms / Q000098:blood supply*; D009389:Neovascularization, Pathologic / Q000000981:diagnostic imaging*; D018617:Ultrasonography, Doppler, Pulsed
D003287:Contrast Media; D019786:Gadolinium DTPA