![]() The performed measurements concerned such quantities as: energy resolution, time resolution, light attenuation length and light output. The performed research included measuring energy resolution for standard radioactive sources (22Na, 137Cs, 133Ba, 60Co and 152Eu) and for elements activated by fast neutrons (in AmBe source) emitting high energy gamma quanta. Such a detector has the best energy resolution among such materials. The aim of this work was to characterize the scintillation detector with LaBr3:Ce:Sr crystal for SABAT project, involving the use of neutrons in the detection of hazardous materials. This createsĪ possibility for high-quality simultaneous imaging of the whole human body. Ultimately, the sensitivity achieved with the studied Total Body scanners is almost uniform along the whole patient with an additional increase on its sides for both double and triple coincidence imaging. The acquired maximal total sensitivity of 30.63(06+/-31) proves to again surpass the traditional crystal-based system up to ~5 times. Furthermore, due to the possibility of the positronium mean lifetime imaging guaranteed by the J-PET technology, its sensitivity based on the triple coincidence technique has been evaluated. At the same time sensitivity at the center of the tomograph can reach up to 124.1(1.0+/-1.1). Such results exceed the conventional PET systems (represented by the Biograph Vision) by a factor of ~4.5 and ~15 respectively. The obtained results demonstrate that the standard imaging total sensitivity achievable with the Total Body J-PET scanners equals to 25.92(05+/-04) for theĢ meter long two-layer tomograph and 84.74(0.9+/-1.1) for the 2.5 meter long fourlayer tomograph. KOSMICZNA SYNCHRONIZACJA SOFTWAREIts principle of operation, as well as detailed validation by comparison with GATE software is presented in this work. Moreover, a Toy Monte-Carlo model has been developed as a simplified approach to the sensitivity investigation. In order to achieve this goal a simulation-based study was carried out with a use of the standard Monte-Carlo simulation software - Geant4 Application for Tomography Emission (GATE). As members, we embrace our responsibilities to contribute to the continuous improvement of the economic, social and environmental well-being of the communities in which we live and work.The main aim of presented thesis is to investigate sensitivity of the Total Body J-PET scanners as a function of their axial field of view and inner module construction, as well as assessing the influence of the angular acceptance criterion (used for PET performance optimization) on this characteristic. Our business model is designed to ensure that we are close to our clients and communities. To this end, we manage our business to generate industry superior returns. KOSMICZNA SYNCHRONIZACJA PROFESSIONALFinancial strength enables us to continuously invest in our members' professional development, our services and our business solutions to the benefit of our clients. We strive to deliver strong, consistent financial performance which sustains long term growth and benefits both members and shareholders. As a global company, we recognize the richness that diversity brings to the company and welcome this diversity while embracing the overall CGI business culture. In all we do, we are respectful of our fellow members, clients, business partners and competitors. As members, we share in the value we create through equity ownership and profit participation. Through teamwork, sharing our know-how and expertise across our global operations, we bring the best of CGI to our clients. We promote a culture of innovation and initiative where we are empowered with a sense of ownership in supporting clients, thus ensuring our profitable growth. Our collective success is based on our competence, commitment and enthusiasm. We never seek to gain undue advantages and we avoid conflicts of interest, whether real or perceived. We do not accept any remuneration from suppliers. In doing so, we adhere to the highest degree of quality, objectivity and integrity. We exercise the highest degree of independent thinking in selecting the products, services and solutions we recommend to clients. We listen to our clients and we are committed to their total satisfaction in everything we do. We entrench these approaches into client relationship and service delivery frameworks in order to foster long term and strong partnerships with our clients. We constantly deepen our understanding of our clients' business and we develop and follow the best management practices. For us, partnership and quality are both a philosophy and a way of life. ![]()
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