We report on the NEMA-NU2-2012 performance of a hypothetical Monte Carlo (MC) model, Ex-PET, Siemens Biograph Vision positron emission tomography (PET)/CT (Bio-Vis) with sparse detector module rings and extended axial field view (AFOV). MC simulations were performed interleaved 32-mm gaps, equivalent to dimension each module, yielding an AFOV 48.0 cm (Bio-Vis has 25.6-cm AFOV). 3D-PET acquisiti...

Mục tiêu của nghiên cứu: Ứng dụng công nghệ xử lý ảnh xSPECT trong ghi hình phóng xạ SPECT/CT. Đối tượng và phương pháp Máy SPECT/CT hãng Siemens, Đức. Phàn mềm xSPECT; Phan-tom nước; Ghi với thuốc 99mTc-MDP trên bệnh nhân ung thư biểu mô tuyến tiền liệt. Kết quả bốn tái tạo: Quant (xQ); Xương™ (xB); Flash 3D (F3D); OSEM, cho thấy lập ma trận hệ thống chính xác hơn là lược đồ cập nhật. định lượ...

This work demonstrates how computational and physical modelling of the positron emission tomography (PET) image acquisition process for a state-of-the-art integrated PET magnetic resonance imaging (PET-MR) system can produce images comparable to manufacturer. The GE SIGNA PET/MR scanner is manufactured by General Electric has time-of-flight (TOF) capabilities about 390 ps. All software developm...

Uvod: Medpoklicno sodelovanje medicinskih sester pri zagotavljanju farmacevtske skrbi je pomembno z vidika zagotavljanja kakovosti zdravstvene oskrbe pacienta. Vendar pa vključevanje v farmacevtsko skrb odpira tudi številna vprašanja, povezana njihovim izobraževanjem ter posledično posedovanjem kompetenc za njihovo učinkovito vlogo skrbi. Cilj raziskave bil ugotoviti stališča zdravnikov, farmac...

Introduction: The key characteristics of positron emission tomography (PET) are its quantitative capability and its sensitivity, which allow the in vivo imaging of biochemical interactions with small amounts of tracer concentrations. Therefore, accurate quantification is important. However, it can be sensitive to several physical factors. The aim of this investigation is the assessment of the e...

A 4D ordered-subsets maximum a posteriori (OSMAP) algorithm for dynamic SPECT is described which uses a temporal prior that constrains each voxel's behaviour in time to conform to a compartmental model. No a priori limitations on kinetic parameters are applied; rather, the parameter estimates evolve as the algorithm iterates to a solution. The estimated parameters and time-activity curves are u...

Small animal PET scanners require high spatial resolution and good sensitivity. To reconstruct high-resolution images in 3D-PET, iterative methods, such as OSEM, are superior to analytical reconstruction algorithms, although their high computational cost is still a serious drawback. The higher performance of modern computers could make iterative image reconstruction fast enough to be viable, pr...

INTRODUCTION Pre-clinical investigation of stem cells for repairing damaged myocardium predominantly uses rodents, however large animals have cardiac circulation closely resembling the human heart. The aim of this study was to evaluate whether SPECT/CT myocardial perfusion imaging (MPI) could be used for assessing sheep myocardium following an acute myocardial infarction (MI) and response to in...