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C-2359 - A Study on Dosimetry using the Video Recording of a Smartphone
M. Yamauchi1, C. Yamauchi-Kawaura2, N. Shimizu1, S. Wakumura1; 1Nagakute-cho, Aichi/JP 2Nagoya/JP
Type: Scientific Exhibit
Area of Interests: Radioprotection / Radiation dose, Radiographers, Radiation physics
Imaging Techniques: Image manipulation / Reconstruction, CT, Conventional radiography
Procedures: Equipment, Dosimetry
Special Focus: Dosimetric comparison

Aims and objectives:
Since the Fukushima nuclear power plant accident, it has been well known that much dot noise exists in video provided by cameras of the monitoring systems in high dose-rate gamma irradiation fields [1]. However, few studies have examined dot noise on exposing a video camera to radiation in the low-e[...]
Methods and materials:
Procedure for estimating the radiation dose by analyzing video noise during irradiation Preparations for the smartphone: To quantify the noise, it was necessary to exclude the background image from the video. Hence, the camera lens of an iPhone 6s (Apple Inc.) was covered with a light dimming sheet [...]
Results:
Linearity of primary radiation dose and noise amount from the video indicated a good dose linearity (R2=0.999) [ Fig. 9 ]. Figure 10 shows the relative noise amount as a function of tube voltage in the same dose. Energy dependence was observed to be within 10% between 80kVp and 140kVp, 25% at 60kV[...]
Conclusion:
This method for estimating the radiation dose has large angular dependence and requires dose calibration. Thus it is not an alternative to the dosimeter. However, we found that changes in X-ray output that can only be measured using an expensive dosimeter with excellent temporal resolution could als[...]
Personal information:
Masato Yamauchi, RT Department of Radiological Technology, Aichi Medical University Hospital, 1-1 Yazakokarimata, Nagakute, Aichi 480-1195, Japan e-mail: yamauchi@aichi-med-u.ac.jp Chiyo Yamauchi-Kawaura, Ph.D. Department of Radiological Sciences, Nagoya University Graduate School of Medicine, 1-1[...]
References:
1. Cho JW, Choi YS, Jeong KM (2014) Monitoring performance of the cameras under the high dose-rate gamma ray environments. Health Phys. 106(5):s47-s58. 2. Xinhui D, Jia W, Jodie AC, Shuai L, Katharine LG, Cynthia HM (2011) Dose reduction to anterior surfaces with organ-based tube-current modulatio[...]

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