مشروع البحث: Design of Shielding Model for PET/CT Room Using Monte Carlo Simulation.
| dc.contributor.advisor | د.سليمة احمد الناطوح | |
| dc.date.accessioned | 2026-06-08T11:06:18Z | |
| dc.date.available | 2026-06-08T11:06:18Z | |
| dc.description | The shielding of positron emission tomography PET/CT computed tomography facilities presents special challenges. The 0.511 MeV annihilation photons associated with positron decay are much higher energy than other diagnostic radiations. Modern PET/CT clinics consist of a scanner room housing the double gantry PET/CT unit and a control area, two or more quiet rooms where patients rest prior to scanning, and a hot lab where doses are prepared. Of these areas, the scanner room, quiet rooms, and frequently the hot lab require structural shielding to protect staff and personnel in surrounding areas. The purpose of this work is to obtain shielding design model for quiet and PET/CT scanner rooms that can provide protection to workers who are carrying duties near the radiology department, visitors and public. In this work three dimensional model of PET/CT scanner and quiet rooms were designed taking into consideration the published shielding guidelines. The model of the quiet room consists of a small room with a MIRD phantom placed in a reclining position. The phantom is the source term with 555 MBq (15 mCi) of 18FDG equally distributed between the brain and the bladder in the phantom. All room structures including walls, floor and ceiling shields are modeled. For the scanner room, the double gantry of the PET/CT unit is modeled as two rings with dimensions and attenuation based on a current PET/CT unit. The MIRD phantom is positioned supine in the scanner and source term of 277 MBq (7.5 mCi) is distributed in the patient. Thirty percent of the dose is located in the patient’s head, with the remainder distributed throughout the body. Additionally, a transformation applied to the rooms and human model (MIRD phantom). By using MONTE CARLO simulation code MCNP4C, weekly dose equivalent to a room above and below the PET/CT facility as well as those adjacent on the same level have been evaluated. More over the effect of both CT source and shielding material on the dose equivalent in the PET/CT unit surround area were evaluated. Since the source terms and the geometry for these models are complex, mesh tallies were used for above, below and adjacent area of the rooms to determine the position of maximum dose rate. The results are compared to the regulatory limits of AAPM Guide for Shielding PET clinics. | |
| dc.description.abstract | The shielding of positron emission tomography PET/CT computed tomography facilities presents special challenges. The 0.511 MeV annihilation photons associated with positron decay are much higher energy than other diagnostic radiations. Modern PET/CT clinics consist of a scanner room housing the double gantry PET/CT unit and a control area, two or more quiet rooms where patients rest prior to scanning, and a hot lab where doses are prepared. Of these areas, the scanner room, quiet rooms, and frequently the hot lab require structural shielding to protect staff and personnel in surrounding areas. The purpose of this work is to obtain shielding design model for quiet and PET/CT scanner rooms that can provide protection to workers who are carrying duties near the radiology department, visitors and public. In this work three dimensional model of PET/CT scanner and quiet rooms were designed taking into consideration the published shielding guidelines. The model of the quiet room consists of a small room with a MIRD phantom placed in a reclining position. The phantom is the source term with 555 MBq (15 mCi) of 18FDG equally distributed between the brain and the bladder in the phantom. All room structures including walls, floor and ceiling shields are modeled. For the scanner room, the double gantry of the PET/CT unit is modeled as two rings with dimensions and attenuation based on a current PET/CT unit. The MIRD phantom is positioned supine in the scanner and source term of 277 MBq (7.5 mCi) is distributed in the patient. Thirty percent of the dose is located in the patient’s head, with the remainder distributed throughout the body. Additionally, a transformation applied to the rooms and human model (MIRD phantom). By using MONTE CARLO simulation code MCNP4C, weekly dose equivalent to a room above and below the PET/CT facility as well as those adjacent on the same level have been evaluated. More over the effect of both CT source and shielding material on the dose equivalent in the PET/CT unit surround area were evaluated. Since the source terms and the geometry for these models are complex, mesh tallies were used for above, below and adjacent area of the rooms to determine the position of maximum dose rate. The results are compared to the regulatory limits of AAPM Guide for Shielding PET clinics. | |
| dc.identifier | 5764 | |
| dc.identifier.uri | https://dspace.academy.edu.ly/handle/123456789/2220 | |
| dc.subject | الهندسة الطبية | |
| dc.title | Design of Shielding Model for PET/CT Room Using Monte Carlo Simulation. | |
| dspace.entity.type | Project | |
| project.endDate | 2014 | |
| project.funder.name | التطبيقية والهندسية | |
| project.investigator | حنان عبدالسلام بحيح | |
| project.startDate | 2013 |