Evaluation of collimators' response: Round and hexagonal holes in parallel and fan beam

Khorshidi, Abdollah; Ashoor, Mansour; Hamzeh, Hosseini Seyed; Rajaee, Azimeh

doi:10.1016/j.pbiomolbio.2012.03.003

Cited by 25 publications

(6 citation statements)

References 17 publications

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“…In addition, the mass attenuation coefficient decreases with increasing energy of γ-ray. In general, this reducing is largely the result of Compton scattering and some photoelectric interactions [42, 43, 44, 45, 46].…”

Section: Discussionmentioning

confidence: 99%

Introducing a novel coefficient on mixed-nanoparticles material: relationship between the theoretical and experimental densities

Ashoor

Khorshidi

Sarkhosh

2019

Heliyon

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Nanoparticles (NPs) indicating a unique potential in bioradiation and nuclear reactor shielding are employed in many fields due to their particular specifications leading improving the mechanical properties as well as pore structure of the concrete-shield. The aim was to introduce a novel coefficient ( ), namely the experimental to theoretical density ratio for mixed-NPs material at various nanoparticles percent concentrations ( ) based on pure mathematical aspects along with the some suitable physical purposes by Monte Carlo method. The change in the mixture density to the change in is always proportional to the value. The density will become maximum at the in which the physical, morphological and chemical features of NPs along with the amounts of voids in the material have a key role over estimating porosity percentage. The NPs’ separation probability as born-cascaded-pairs towards very small radii may be formulated as where and are constant values. In conclusion, the theoretical results may be experimentally used in future work for different applications such as designing shield at a nuclear facility.

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Section: Discussionmentioning

confidence: 99%

Introducing a novel coefficient on mixed-nanoparticles material: relationship between the theoretical and experimental densities

Ashoor

Khorshidi

Sarkhosh

2019

Heliyon

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“…So, the MCNP uses a fitting technique that consisted of using a BFT8 GEB^card. GEB is a special treatment for tallies to better simulate a physical radiation detector in which energy peaks exhibit Gaussian energy broadening [12]. The tallied energy is broadened by sampling from the Gaussian which is done by Eq.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Capabilities of the Monte Carlo Simulation Codes for Modeling of a Small Animal SPECT Camera

Sadremomtaz

Telikani

2018

Nucl Med Mol Imaging

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Comparison between simulation and experimental results showed that among these MC codes, GATE enabled to accurately model realistic SPECT system and electromagnetic physical processes, but it required more time and hardware facilities to run simulations. SIMIND was the most flexible and user-friendly code to simulate a SPECT camera, but it had limitations in defining the non-conventional imaging device. The most important characteristics like time and speed of simulation, preciseness of results, and user-friendliness should be considered during simulations.

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“…Although this compromise has been improved on the converging collimators like cone beam and fan beam, the field of view (FOV) is limited. By converging collimators, lessening the distance from the object to the focal point increases the magnification of acquired image; reciprocally, a smaller fraction of the object is shown [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Point Spread Function by Collimators’ New Configuration in Nuclear Medicine

Ashoor

Khorshidi

2021

Preprint

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Objective: The collimators in which the various geometrical configurations have been suggested to optimize the sensitivity and resolution have a key role in acquiring the qualified images in nuclear medicine towards a better recognition of some diseases. Methods: In this study, a new configuration as a geometrical combination of the conical, cylindrical and spherical (CCS) volumes for parallel hole collimators which is assessed by using the volumetric-parametric method has been introduced to improve point spread function (PSF) being the collimators response on the radioactive point source. It has been simulated by the MCNPX code at the various energies values of the point source along with the traditional collimator in which included the cylindrical volume only. Results: The PSF will transmogrify from a delta function to a distribution which can correlate with a Gaussian distribution, while the scattered gamma rays were increased. The simulation results have indicated that the PSF in the CCS configuration is narrower than that of the cylindrical one at all the energies, leading the improvement of the resolution. Also, the theoretical results are agreement with the simulated ones. The more the energy value of the source, the more broaden the PSF will be due the more penetration strength. The narrower the PSF, the better the qualified image will be. Conclusion: This method may be employed to determine the accurate attenuation coefficient of absorbers as well.

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Evaluation of collimators' response: Round and hexagonal holes in parallel and fan beam

Cited by 25 publications

References 17 publications

Introducing a novel coefficient on mixed-nanoparticles material: relationship between the theoretical and experimental densities

Introducing a novel coefficient on mixed-nanoparticles material: relationship between the theoretical and experimental densities

Capabilities of the Monte Carlo Simulation Codes for Modeling of a Small Animal SPECT Camera

Improvement of the Point Spread Function by Collimators’ New Configuration in Nuclear Medicine

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