نتایج جستجو برای: SIMIND

تعداد نتایج: 51  

Journal: :iranian journal of radiation research 0
h.r. khosravi department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran s. sarkar department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran a. takavar department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran m. saghari department of nuclear medicine, shariati hospital, tehran university of medical sciences, tehran, iran m. shahriari department of medical radiation, shahid beheshti university, tehran, iran

background: various variance reduction techniques such as forced detection (fd) have been implemented in monte carlo (mc) simulation of nuclear medicine in an effort to decrease the simulation time while keeping accuracy. however most of these techniques still result in very long mc simulation times for being implemented into routine use. materials and methods: convolution-based forced detectio...

A. Takavar, H.R. Khosravi, M. Saghari, M. Shahriari, S. Sarkar,

Background: Various variance reduction techniques such as forced detection (FD) have been implemented in Monte Carlo (MC) simulation of nuclear medicine in an effort to decrease the simulation time while keeping accuracy. However most of these techniques still result in very long MC simulation times for being implemented into routine use. Materials and Methods: Convolution-based force...

Journal: :iranian journal of medical physics 0
farshid babapour mofrad ph.d., candidate, faculty of engineering, science and research branch, islamic azad university, tehran, iran ali abbaspour tehrani-fard assistant professor, faculty of engineering, science and research branch, islamic azad university, tehran, iran babak ebrahimi m.sc., faculty of engineering, science and research branch, islamic azad university, tehran, iran dariush sardari assistant professor, faculty of engineering, science and research branch, islamic azad university, tehran, iran

introduction: spect is a diagnostic imaging technique the main disadvantage of which is the existence of poisson noise. so far, different methods have been used by scientists to improve spect images. the wavelet transform is a new method for de-noising which is widely used for noise reduction and quality enhancement of images. the purpose of this paper is evaluation of noise reduction in spect ...

Journal: :iranian journal of medical physics 0
jalil pirayesh islamian department of medical physics, tabriz university of medical sciences, tabriz, iran. mohammad taghi bahreyni toossi department of medical physics, mashhad university of medical sciences, mashhad, iran.

introduction quality control is an important phenomenon in nuclear medicine imaging. a jaszczak spect phantom provides consistent performance information for any spect or pet system. this article describes the simulation of a jaszczak phantom and creating an executable phantom file for comparing assessment of spect cameras using simind monte carlo simulation program which is well-established fo...

Introduction: In radionuclide imaging, object scatter is one of the major factors leading to image quality degradation. Therefore, the correction of scattered photons might have a great impact on improving the image quality. Regarding this, the present study aimed to determine the main and sub-energy windows for triple energy window (TEW) scatter correction method usin...

Journal: :iranian journal of medical physics 0
mohammad taghi bahreyni toossi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran jalil pirayesh islamian assistant professor, medical physics dept., faculty of medicine, tabriz university of medical sciences, tabriz, iran mahdi momennezhad assistant professor, nuclear medicine dept., imam reza hospital, mashhad university of medical sciences, mashhad, iran seyed rasoul zakavi associate professor, nuclear medicine dept., imam reza hospital, mashhad university of medical sciences, mashhad, iran ramin sadeghi assistant professor, nuclear medicine dept., imam reza hospital, mashhad university of medical sciences, mashhad, iran lejonberg m professor, medical radiation physics dept., clinical sciences-lund, lund university, lund, sweden

introduction: in single photon emission computed tomography (spect), the projection data used for image reconstruction are distorted by several factors, including attenuation and scattering of gamma rays, collimator structure, data acquisition method, organ motion, and washout of radiopharmaceuticals. all these make reconstruction of a quantitative spect image very difficult. simulation of a sp...

2005
ANNE LARSSON

2 Cover illustration: The logarithm of a 123 I point spread function. The point source was simulated at 14.0 cm distance from the collimator in air, with the SIMIND version described in Paper V, using parameters corresponding to a GE Millennium MPR with 2.3 × 2.3 m 2 field of view. The grey scale is processed. To Björn, family and friends If you don't care where you are, you ain't lost. ABSTRAC...

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