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Ko, Je, Hwang, and Park: The Dose and Risk Reduction from Adoption of Automatic mA Control in 4D CT Scans
Original Article

Progress in Medical Physics 2015;26(4):267-272.

Published online: 20 January 2015

DOI: https://doi.org/10.14316/pmp.2015.26.4.267

The Dose and Risk Reduction from Adoption of Automatic mA Control in 4D CT Scans

Young Eun Ko∗, Hyoung Uk Je∗, Yeon Hwang†, Sung Ho Park†

∗Department of Radiation Oncology, Ulsan, Korea

†Neurosurgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea

Correspondence: Sung Ho Park (michael@uuh.ulsan.kr) Tel: 82-52-250-7137, Fax: 82-52-250-7138 cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received 9 December 2015       Revised 21 December 2015       Accepted 22 December 2015

Copyright © 2015 Korean Society of Medical Physics

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the reduction of dose and risk was evaluated from using automatic mA control in 4D CT scan of patients whose organ movement was considered for gated radiotherapy. The organ doses, CTDI, effective doses from 4D CT with and without using automatic mA control were evaluated using CT-Expo program for each 10 patients of liver and lung cancer, and the risk of exposure induced death and loss of life expectancy were evaluated using PCXMC program. It was founded that there were 26.8%, and 15.5% dose reduction in organ doses and CTDI for liver and lung cancer patients and 16.5% and 19.8% risk reduction in liver and lung cancer patients. The organ doses and effective doses were evaluated for the parameter of each patient used in CT scans, and risks considering age and gender could be evaluated. It was founded that there were 21.2% dose reduction and 18.2% risk reduction in 4D CT scan using AEC for liver and lung cancer patients.

Keywords: 4D-CT, Auto mA Control, CTDI, Effective dose, Risk of exposure induced death, Loss of life expectancy

References

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Fig. 1.
Screen shot of CT-Expo.
pmp-26-267f1.tif
Fig. 2.
Screen shot risk assessment module of PCXMC.
pmp-26-267f2.tif
Fig. 3.
Calculated organ doses from 4D CT scan for Liver cancer patients.
pmp-26-267f3.tif
Fig. 4.
Calculated organ doses from 4D CT scan for Lung cancer patients.
pmp-26-267f4.tif
Table 1.
Patient chracteristics.
Cancer Site   Liver       Lung  
Adoption of AEC function No   Yes   No Yes  
Gender M F M F M F M F
No. of Patients 10 10 10 9 9 9 8 9
Mean Age 66.4 66.2 61.7 61.1 68.1 60.8 68.7 69.3
Table 2.
Calculated organ doses, CTDI, effective doses, REIDs and LLEs from 4D CT of liver and lung cancer patients.
Cancer Site   Liver     Lung  
Adoption of AEC function No     Yes   No Ye es
Gender M F M F M F M F
Mean Organ Dose, mSv 3.4 3.6 2.44 2.82 2.77 3.44 2.29 3.05
Mean CTDI, mGy 4.66 4.76 3.46 3.44 4.37 4.73 3.61 4.09
Mean Effective Dose, mSv 2.96 4.02 2.03 3.0 2.49 3.56 2.06 3.4
Mean REID, % 0.0120 0.0165 0.010 0 0.0140 0.007 5 0.0141 0.0060 0.0123
Mean LLE, hr 13.5 21 12.6 21.2 8.2 22.2 5.6 13.2

CTDI: Computed Tomography Dose Index, REID: Risk of Exposure Induced cancer Death, LLE: Loss of Life Expectancy.

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