title: Experimental Approach to Evaluate the 11C Perfusion and Diffusion in Small Animal Tissues for HadronPET Applications.
abstract: The development of a reliable dose monitoring system in hadron therapy is essential in order to control the treatment plan delivery. Positron Emission Tomography (PET) is the only method used in clinics nowadays for quality assurance. However, the accuracy of this method is limited by the loss of signal due to the biological washout processes. Up to the moment, very few studies measured the washout processes and there is no database of washout data as a function of the tissue and radioisotope. One of the main difficulties is related to the complexity of such measurements, along with the limited time slots available in hadron therapy facilities. Thus, in this work, we proposed an alternative in vivo methodology for the measurement and modeling of the biological washout parameters without any radiative devices. It consists in the implementation of a point-like radioisotope source by direct injection on the tissues of interest and its measurement by means of high-resolution preclinical PET systems. In particular, the washout of 11C carbonate radioisotopes was assessed, considering that 11C is is the most abundant β+ emitter produced by carbon beams. 11C washout measurements were performed in several tissues of interest (brain, muscle and 9L tumor xenograf) in rodents (Wistar rat). Results show that the methodology presented is sensitive to the washout variations depending on the selected tissue. Finally, a first qualitative correlation between 11C tumor washout properties and tumor metabolism (via 18F-FDG tracer uptake) was found.
authors.affiliation: IMNC - UMR 8165 CNRS/Univ Paris 11/Univ Paris 7 - Orsay, France.|CEA/I2BM/SHFJ - IMIV, UMR 1023 Inserm/CEA/Univ Paris 11, ERL 9218 CNRS - Orsay, France.
authors.forename: Immaculada
authors.initials: I
authors.lastname: Martínez-Rovira
authors.affiliation: CEA/I2BM/SHFJ - IMIV, UMR 1023 Inserm/CEA/Univ Paris 11, ERL 9218 CNRS - Orsay, France.
authors.forename: Raphaël
authors.initials: R
authors.lastname: Boisgard
authors.affiliation: CEA/I2BM/SHFJ - IMIV, UMR 1023 Inserm/CEA/Univ Paris 11, ERL 9218 CNRS - Orsay, France.
authors.forename: Géraldine
authors.initials: G
authors.lastname: Pottier
authors.affiliation: CEA/I2BM/SHFJ - IMIV, UMR 1023 Inserm/CEA/Univ Paris 11, ERL 9218 CNRS - Orsay, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Kuhnast
authors.affiliation: CEA/I2BM/SHFJ - IMIV, UMR 1023 Inserm/CEA/Univ Paris 11, ERL 9218 CNRS - Orsay, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Jan
mesh_terms: D000818:Animals; D001921:Brain / Q000187:drug effects; D002250:Carbon Radioisotopes / Q000737:chemistry / Q000627:therapeutic use*; D019788:Fluorodeoxyglucose F18 / Q000737:chemistry / Q000627:therapeutic use*; D064593:Heterografts / Q000737:chemistry; D006801:Humans; D018482:Muscle, Skeletal / Q000737:chemistry / Q000187:drug effects; D009369:Neoplasms / Q000737:chemistry / Q000000981:diagnostic imaging*; D010477:Perfusion / Q000379:methods*; D049268:Positron-Emission Tomography; D051381:Rats; D014018:Tissue Distribution
chemical_list: D002250:Carbon Radioisotopes; D019788:Fluorodeoxyglucose F18