Path-Planning System for Radioisotope Identification Devices Using 4π Gamma Imaging Based on Random Forest Analysis

Hideki Tomita; Shintaro Hara; Atsushi Mukai; Keita Yamagishi; Hidetake Ebi; Kenji Shimazoe; Yusuke Tamura; Hanwool Woo; Hiroyuki Takahashi; Hajime Asama; Fumihiko Ishida; Eiji Takada; Jun Kawarabayashi; Kosuke Tanabe; Kei Kamada

doi:10.3390/s22124325

Path-Planning System for Radioisotope Identification Devices Using 4π Gamma Imaging Based on Random Forest Analysis

Sensors (Basel). 2022 Jun 7;22(12):4325. doi: 10.3390/s22124325.

Authors

Affiliations

¹ Department of Energy Engineering, Nagoya University, Nagoya 464-8603, Japan.
² Department of Nuclear Engineering and Management, The University of Tokyo, Tokyo 113-8656, Japan.
³ Department of Robotics, Tohoku University, Sendai 980-8579, Japan.
⁴ Department of Mechanical Systems Engineering, Kogakuin University, Hachioji 192-0015, Japan.
⁵ Department of Precision Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
⁶ National Institute of Technology, Toyama College, Toyama-shi 939-8630, Japan.
⁷ Department of Nuclear Safety Engineering, Tokyo City University, Tokyo 158-8557, Japan.
⁸ National Research Institute of Police Science, Chiba 277-0882, Japan.
⁹ Institute of Engineering Innovation, Tohoku University, Sendai 980-8579, Japan.

Abstract

We developed a path-planning system for radiation source identification devices using 4π gamma imaging. The estimated source location and activity were calculated by an integrated simulation model by using 4π gamma images at multiple measurement positions. Using these calculated values, a prediction model to estimate the probability of identification at the next measurement position was created by via random forest analysis. The path-planning system based on the prediction model was verified by integrated simulation and experiment for a ¹³⁷Cs point source. The results showed that ¹³⁷Cs point sources were identified using the few measurement positions suggested by the path-planning system.

Keywords: 4π gamma imaging; path planning; radioisotope identification; random forest.

MeSH terms

Diagnostic Imaging*
Radioisotopes
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted* / methods

Substances

Radioisotopes

Grants and funding

19H00881/JSPS KAKENHI: Grant-in-Aid for Scientific Research (A)