Organ Doses from Pediatric Head CT Scan (CROSBI ID 653350)
Prilog sa skupa u časopisu | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Liu, H. ; Liu, Q. ; Majer, Marija ; Knežević, Željka ; Miljanić, Saveta ; Hršak, Hrvoje ; Zhuo, W.
engleski
Organ Doses from Pediatric Head CT Scan
Purpose: To evaluate the organ doses of pediatric patients who undergoing head CT scan using Monte Carlo (MC) simulation and compare it with measurements in anthropomorphic child phantom.. Methods: A ten years old children voxel phantom was developed from CT images, the voxel size of the phantom was 2mm*2mm*2mm. Organ doses from head CT scan were simulated using MCNPX software, 180 detectors were placed in the voxel phantom to tally the doses of the represented tissues or organs. When performing the simulation, 120 kVp and 88 mA were selected as the scan parameters. The scan range covered from the top of the head to the end of the chain, this protocol was used at CT simulator for radiotherapy. To validate the simulated results, organ doses were measured with radiophotoluminescence (RPL) detectors, placed in the 28 organs of the 10 years old CIRS ATOM phantom. Results: The organ doses results matched well between MC simulation and phantom measurements. The eyes dose was showed to be as expected the highest organ dose: 28.11 mGy by simulation and 27.34 mGy by measurement respectively. Doses for organs not included in the scan volume were much lower than those included in the scan volume, thymus doses were observed more than 10 mGy due the CT protocol for radiotherapy covered more body part than routine head CT scan. Conclusion: As the eyes are superficial organs, they may receive the highest radiation dose during the CT scan. Considering the relatively high radio sensitivity, using shielding material or organ based tube current modulation technique should be encouraged to reduce the eye radiation risks. Scan range was one of the most important factors that affects the organ doses during the CT scan. Use as short as reasonably possible scan range should be helpful to reduce the patient radiation dose. This work was supported by the National Natural Science Foundation of China(11475047)
Dosimetry ; Computed tomography ; Monte Carlo methods ; Eyes ; Image sensors ; Tissues ; Medical imaging
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Podaci o prilogu
3394-3394.
2016.
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objavljeno
10.1118/1.4955860
Podaci o matičnoj publikaciji
Medical physics
0094-2405
2473-4209
Podaci o skupu
Fifty-eighth annual meeting of the american association of physicists in medicine
poster
31.07.2016-04.08.2016
Washington D.C., Sjedinjene Američke Države
Povezanost rada
Fizika, Kliničke medicinske znanosti