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Title: SU-F-I-32: Organ Doses from Pediatric Head CT Scan

Abstract

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, thymusmore » 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)« less

Authors:
; ; ;  [1]; ; ;  [2];  [3]
  1. Institute of Radiation Medicine Fudan University, Shanghai (China)
  2. Radiation Chemistry and Dosimetry Laboratory, Ruder Boskovic Institute, Zagreb (Croatia)
  3. Clinical Hospital Centre Zagreb, Zagreb (Croatia)
Publication Date:
OSTI Identifier:
22626793
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; ANIMAL TISSUES; COMPUTER CODES; COMPUTERIZED TOMOGRAPHY; EYES; IMAGE PROCESSING; MODULATION; MONTE CARLO METHOD; PATIENTS; PEDIATRICS; PHANTOMS; RADIATION DOSES; RADIOTHERAPY; SHIELDING; SHIELDING MATERIALS; SIMULATION; THYMUS

Citation Formats

Liu, H, Liu, Q, Qiu, J, Zhuo, W, Majer, M, Knezevic, Z, Miljanic, S, and Hrsak, H. SU-F-I-32: Organ Doses from Pediatric Head CT Scan. United States: N. p., 2016. Web. doi:10.1118/1.4955860.
Liu, H, Liu, Q, Qiu, J, Zhuo, W, Majer, M, Knezevic, Z, Miljanic, S, & Hrsak, H. SU-F-I-32: Organ Doses from Pediatric Head CT Scan. United States. doi:10.1118/1.4955860.
Liu, H, Liu, Q, Qiu, J, Zhuo, W, Majer, M, Knezevic, Z, Miljanic, S, and Hrsak, H. Wed . "SU-F-I-32: Organ Doses from Pediatric Head CT Scan". United States. doi:10.1118/1.4955860.
@article{osti_22626793,
title = {SU-F-I-32: Organ Doses from Pediatric Head CT Scan},
author = {Liu, H and Liu, Q and Qiu, J and Zhuo, W and Majer, M and Knezevic, Z and Miljanic, S and Hrsak, H},
abstractNote = {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)},
doi = {10.1118/1.4955860},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}