(18)F-FDG and (18)F-FET uptake in experimental soft tissue infection

Kaim, AK; Weber, B; Kurrer, MO; Westera, G; Schweitzer, A; Gottschalk, J; von Schulthess, GK; Buck, A

doi:10.1007/s00259-002-0780-y

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(18)F-FDG and (18)F-FET uptake in experimental soft tissue infection

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Kaim, A., Weber, B., Kurrer, M., Westera, G., Schweitzer, A., Gottschalk, J., et al. (2002). (18)F-FDG and (18)F-FET uptake in experimental soft tissue infection. European Journal of Nuclear Medicine and Molecular Imaging, 29(5), 648-654. doi:10.1007/s00259-002-0780-y.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-E082-1

Abstract

The aim of this study was to compare the uptake of (18)F-fluoroethyl- L-tyrosine ((18)F-FET) with that of (18)F-fluorodeoxyglucose ((18)F-FDG) in activated inflammatory white blood cells. Unilateral thigh muscle abscesses were induced in 11 rats by intramuscular inoculation of 0.1 ml of a bacterial suspension ( S. aureus, 1.2 x 10(9) CFU/ml). Four animals were intraperitoneally injected with 130-180 MBq (18)F-FDG, four with 140-170 MBq (18)F-FET and three with a mixture of 140-170 MBq (18)F-FET and 1.8 MBq (14)C-deoxyglucose. Autoradiography (10 microm slice thickness) of the abscess and the contralateral muscle was performed and detailed spatial correlation of autoradiography and histopathology (haematoxylin-eosin staining) was obtained. Regions of interest were placed on the abscess wall and the grey values (digitised image intensities) measured were converted to kBq/cc per kBq injected activity per gram (SUV). Areas with increased (18)F-FDG uptake corresponded to cellular inflammatory infiltrates mainly consisting of granulocytes. The SUV was calculated to be 4.08+/-0.65 (mean+/-SD). The uptake of (18)F-FET in activated white blood cells was not increased: the SUV of the abscess wall, at 0.74+/-0.14, was even below that of contralateral muscle. The low uptake of (18)F-FET in non-neoplastic inflammatory cells promises a higher specificity for the detection of tumour cells than is achieved with (18)F-FDG, since the immunological host response will not be labelled and inflammation can be excluded.