Acknowledgement
This study was supported by a grant of the Korea Institute of Radiological and Medical Sciences (KIRAMS), funded by Ministry of Science and ICT(MSIT), Republic of Korea. (No.50535-2021) The authors would like to express their gratitude to Choonsik Lee at the National Cancer Institute, X. George Xu at the Rensselaer Polytechnic Institute, Richard Kramer at the Federal University of Pernambuco, and Kaoru Sato at the Japan Atomic Energy Agency for providing valuable data on computational phantoms.
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