introduction:it is well-recognized that collimator-detector response (cdr) is the main image blurring factor in spect.  in this research, we compensated the images for cdr in molecular spect by using stir reconstruction framework. methods: to assess resolution recovery capability of the stir, a phantom containing five point sources along with a micro derenzo phantom were investigated. influence...

objective(s): the energy resolution of a cadmium-zinc-telluride (czt) solid-state semiconductor detector is about 5%, and is superior to the resolution of the conventional anger type detector which is 10%. also, the window width of the high-energy part and of the low-energy part of a photo peak window can be changed separately. in this study, we used a semiconductor detector and examined the ef...

remote sensing using small spacecraft arising from multi-objective economic activity problems is getting more and more developed. these satellites require very accurate pointing to specific locations of interest, with high reliability and small latency. the space borne imaging systems always attempted to achieve the highest ground resolution possible with the available technology at the given t...

natural background radiation is the main source of human exposure to radioactive material. soils naturally have radioactive mineral contents. the aim of this study is to determine natural ((238) u, (232) th, (40) k) and artificial ((137) cs) radioactivity levels in wheat and corn fields of eilam province.hpge detector was used to measure the concentration activity of (238) u and (232) th series...

We consider a linear multistage detector with universal (large system) weighting for large asynchronous code-division multiple-access (CDMA). A convenient choice of the basis of the projection subspace allows a joint projection of all users’ signals and avoids truncation effects due to finite time windowing. Thanks to the joint projection the complexity per bit of the proposed detector scales l...

near-far-ratio (NFR = EJE,, i = 2,3,4,5) with the signal-to-noiseratio (SNR) of user 1 being futed at 8dB. It can be seen from Fig. 1 that the TSTCNN detector outperforms the HNN detector over the NFR range. When the NFR is low, the TCNN detector has poor performance. As the NFR increases, the performance of both the TCNN detector and the TSTCNN detector approach that of the optimum detector cl...