نتایج جستجو برای: iterative algorithm beam angle selection
تعداد نتایج: 1284108 فیلتر نتایج به سال:
In the algorithm of Leksell GAMMAPLAN (the treatment planning software of Leksell Gamma Knife), scattered photons from the collimator system are presumed to have negligible effects on the Gamma Knife dosimetry. In this study, we used the EGS4 Monte Carlo (MC) technique to study the scattered photons coming out of the single beam channel of Leksell Gamma Knife. The PRESTA (Parameter Reduced Elec...
The aim of the research presented in this paper is to find out whether automatic classification of ships from Forward Looking InfraRed (FLIR) images is feasible in maritime patrol aircraft. An image processing system has been developed for this task. It includes iterative shading correction and a top hat filter for the detection of the ship. It uses a segmentation algorithm based on the gray va...
The SeaWinds on QuikScat scatterometer is the first in a series of new scanning pencil-beam Ku-band scatterometers. The viewing geometry is significantly different than previous fan beam instruments, resulting in different characteristics in the retrieved winds. In this paper we provide an assessment of the reliability of the SeaWinds ambiguity selection using a SeaWinds data-only algorithm. An...
CT scan by use of a beam-filter placed between the x-ray source and patient allows single-scan low-dose dual-energy imaging with minimal hardware modification to existing systems. We have earlier demonstrated feasibility such method multi-slit reciprocating along direction perpendicular rotation axis in cone-beam system. However, would face mechanical challenges when is supposed cooperate fast-...
The design of a radiotherapy treatment includes the selection of beam angles (geometry problem), the computation of a fluence pattern for each selected beam angle (intensity problem), and finding a sequence of configurations of a multilef collimator to deliver the treatment (realization problem). While many mathematical optimization models and algorithms have been proposed for the intensity pro...
begin{abstract} in this paper, we introduce an iterative method for amenable semigroup of non expansive mappings and infinite family of non expansive mappings in the frame work of hilbert spaces. we prove the strong convergence of the proposed iterative algorithm to the unique solution of a variational inequality, which is the optimality condition for a minimization problem. the results present...
In this paper, a new relaxation algorithm for solving geometric constraint-based models is proposed. The algorithm starts from a constructive symbolic representation of objects (Constructive Parametric Solid Model, CPSM) and proceeds by iterative relaxation of the geometric constraints. Models that can be reduced to distance and angle constraints can be handled. A new algorithm based on an iter...
A maximum likelihood approach to emission image reconstruction from projections. Maximum likelihood from incomplete data via the EM algorithm. " A theoretical study of some maximum likelihood algorithms for emission and transmission tomography. Attenuation compensation of cone beam SPECT images using maximum likelihood reconstruction. Three-dimensional SPECT reconstruction of combined cone beam...
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