MCNP4C-BASED MONTE CARLO STUDY OF GRID PERFORMANCE IN DIAGNOSTIC RADIOLOGY

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GHAFARIAN PARDIS; SHARAFI A.A.; KESHVARZI K.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2007 | Volume:3 | Issue:13 Page(s): 41-48

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Title

MCNP4C-BASED MONTE CARLO STUDY OF GRID PERFORMANCE IN DIAGNOSTIC RADIOLOGY

Author(s)

GHAFARIAN PARDIS | SHARAFI A.A. | KESHVARZI K. | Issue Writer Certificate

Keywords

PARALLEL GRIDQ3

MONTE CARLO METHODQ3

MCNP4CQ3

SCATTERED RADIATIONQ3

Abstract

Introduction: In diagnostic radiology, the presence of scattered photons effectively decreases the image ‎quality. The introduction of grid has great impact on the improvement of image contrast and as a result on the image quality. A detailed ‎knowledge of SCATTERED RADIATION distribution is necessary to optimize grid design.‎Materials and Methods: In this work, the MONTE CARLO METHOD (MCNP4C code) was used for the calculation of SCATTERED RADIATION distribution and scatter to primary ratio (SPR). ‎So the variation in the phantom thickness, field size, tube voltage and aluminium filter are considered. Thereafter, the contribution of grid parameters such as strip density, grid ratio, ‎interspace material and lead-to-interspace ratio, height of strip, thickness of strip and thickness of interspace on scatter rejection was investigated by ‎the calculation of bucky factor and contrast improvement factor in 108 linear ‎PARALLEL GRIDs under standard ‎conditions proposed by International Electrotechnical Commission. Full simulation of photon interactions has been considered for the ‎evaluation of aluminium grids and cotton fiber as ‎interspace material. The simulation of x-ray spectra and photon transport in materials was ‎validated by comparing it to the measured data.Results: An increase of 15% in SPR for tube voltage ‎between 40 and 140 kV was obtained in a standard phantom whereas an increase of 99% ‎was observed for phantom thicknesses between 3 and 40 cm at 120 kV. It has been shown that in grids with similar strip density, both contrast improvement factor and bucky factor increase with ‎increasing grid ratio. The same behavior was observed for grids with similar grid ratio ‎when strip density are decreased. Discussion and Conclusion: The grids with cotton fiber show better performance than aluminium interspace grids with the same grid parameters especially in ‎low strip density and high grid ratio. Likewise, the grids with high strip density and high ‎grid ratio perform better than low strip density ones.

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APA: Copy

GHAFARIAN, PARDIS, SHARAFI, A.A., & KESHVARZI, K.. (2007). MCNP4C-BASED MONTE CARLO STUDY OF GRID PERFORMANCE IN DIAGNOSTIC RADIOLOGY. IRANIAN JOURNAL OF MEDICAL PHYSICS, 3(13), 41-48. SID. https://sid.ir/paper/96932/en

Vancouver: Copy

GHAFARIAN PARDIS, SHARAFI A.A., KESHVARZI K.. MCNP4C-BASED MONTE CARLO STUDY OF GRID PERFORMANCE IN DIAGNOSTIC RADIOLOGY. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2007;3(13):41-48. Available from: https://sid.ir/paper/96932/en

IEEE: Copy

PARDIS GHAFARIAN, A.A. SHARAFI, and K. KESHVARZI, “MCNP4C-BASED MONTE CARLO STUDY OF GRID PERFORMANCE IN DIAGNOSTIC RADIOLOGY,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 3, no. 13, pp. 41–48, 2007, [Online]. Available: https://sid.ir/paper/96932/en

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