27 research outputs found

    Prostate cancer: F-18-fluorocholine PET-CT utility. [Cancer de la prostate : utilité de la TEP-TDM à la 18F-fluorocholine.]

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    In oncology, positron emission computed tomography (PET/CT) has become an essential tool for initial staging, response evaluation and follow-up of cancer patients. Most of the frequent tumors (lung, breast, esophagus, and lymphomas) are highly avid for (18)F-fluorodeoxyglucose ((18)FDG), but prostate cancer has not demonstrated significant uptake of FDG. The development of new tracers labeled with (18)F such as choline analogs allowed already to obtain interesting results particularly in patients with biological relapse and inconclusive conventional imaging workup. The impact of (18)F-flurocholine PET/CT on patient management needs to be validated in large studies, but many centers use already this examination in order to guide further management, including radiotherapy planning. (C) 2011 Elsevier Masson SAS. All rights reserved

    Qualification des émissions d'aérosols radioactifs liées à l'utilisation d'un générateur de technétium en service de médecine nucléaire

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    National audienceThe objective of this work is to characterize the emission of radioactive particles of 99mTc (technetium-99, a metastable gamma emitter of 6 h half-life) for lung marking in the environment of a nuclear medicine department. We studied the leakage of radioactive particles from the generating system during a lung scan test. This possible source of air contamination has been little studied and a specifically adapted survey methodology remains to be developed. To measure the leakage of radioactive particles from the generator, we designed a transportable test enclosure permitting one to collect and sample particles with a known accuracy, a low background level and the capability of recording short time events. Here, we present the characterization operations for this system and results we obtained with patients. The results show that radioactivity released in the air by the generator leakage is superior to that deposited in the patients' lungs by inhalation, that is, respectively, 5.7% and 3.8% of the total radioactivity initially introduced into the generator. © 2012 EDP Sciences.L’objectif de ce travail est de caractĂ©riser l’émission de particules radioactives de 99mTc (technĂ©tium-99 mĂ©tastable Ă©metteur gamma de demi-vie 6 h) servant au marquage pulmonaire dans l’environnement d’un service de mĂ©decine nuclĂ©aire. Nous avons Ă©tudiĂ© les fuites du systĂšme gĂ©nĂ©rateur de particules radioactives lors d’un examen de scintigraphie pulmonaire. Cette Ă©ventuelle source de contamination ambiante a Ă©tĂ© peu Ă©tudiĂ©e et une mĂ©thodologie de surveillance spĂ©cifiquement adaptĂ©e reste Ă  dĂ©velopper. Pour mesurer les fuites des gĂ©nĂ©rateurs d’aĂ©rosols radioactifs Ă©tudiĂ©s, nous avons conçu une enceinte d’essai transportable permettant de capter les particules et de les Ă©chantillonner avec une prĂ©cision connue, un niveau de bruit de fond trĂšs faible et une capacitĂ© d’enregistrer les Ă©missions transitoires courtes. Nous prĂ©sentons les opĂ©rations de caractĂ©risation de ce systĂšme et les rĂ©sultats obtenus avec des patients. Ces rĂ©sultats montrent que l’activitĂ© Ă©mise en ambiance par les fuites du gĂ©nĂ©rateur est supĂ©rieure Ă  celle dĂ©posĂ©e dans les poumons du patient par inhalation, soit respectivement 5,7 % et 3,8 % de l’activitĂ© initialement introduite dans le gĂ©nĂ©rateur
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