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Choi K, Koo CU, Oh J, Kim J, Park JI, Kim SH, Lee JH, Kang DG, Ye SJ. Enhanced Dosimetric Accuracy Using Quality Factor Compensation Method for In Vivo Electron Paramagnetic Resonance Tooth Dosimetry. HEALTH PHYSICS 2023; 125:352-361. [PMID: 37565831 DOI: 10.1097/hp.0000000000001727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
ABSTRACT We aim to develop a dose assessment method compensating for quality factors (Q factor) observed during in vivo EPR tooth dosimetry. A pseudo-in-vivo phantom made of tissue-equivalent material was equipped with one each of four extracted human central incisors. A range of Q factors was measured at tooth-depths of -2, 0, and 2 mm in the pseudo-in-vivo phantom. In addition, in vivo Q factors were measured from nine human volunteers. For the dose-response data, the above four sample teeth were irradiated at 0, 1, 2, 5, and 10 Gy, and the radiation-induced signals were measured at the same tooth-depths using an in vivo EPR tooth dosimetry system. To validate the method, the signals of two post-radiotherapy patients and three unirradiated volunteers were measured using the same system. The interquartile range of the Q factors measured in the pseudo-in-vivo phantom covered that observed from the human volunteers, which implied that the phantom represented the Q factor distribution of in vivo conditions. The dosimetric sensitivities and background signals were decreased as increasing the tooth-depth in the phantom due to the decrease in Q factors. By compensating for Q factors, the diverged dose-response data due to various Q factors were converged to improve the dosimetric accuracy in terms of the standard error of inverse prediction (SEIP). The Q factors of patient 1 and patient 2 were 98 and 64, respectively, while the three volunteers were 100, 92, and 99. The assessed doses of patient 1 and patient 2 were 2.73 and 12.53 Gy, respectively, while expecting 4.43 and 13.29 Gy, respectively. The assessed doses of the unirradiated volunteers were 0.53, 0.50, and - 0.22 Gy. We demonstrated that the suggested Q factor compensation could mitigate the uncertainty induced by the variation of Q factors.
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Affiliation(s)
- Kwon Choi
- Program in Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea
| | - Chang Uk Koo
- Program in Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea
| | - Jeonghun Oh
- Program in Biomedical Radiation Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea
| | - Jiwon Kim
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Korea
| | - Jong In Park
- Ionizing Radiation Metrology Group, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
| | - Sung Hwan Kim
- Department of Radiation Oncology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon 16247, Korea
| | - Jong Hoon Lee
- Department of Radiation Oncology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon 16247, Korea
| | - Dae Gyu Kang
- Department of Radiation Oncology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon 16247, Korea
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Machine learning for determination of the native background EPR signal amplitude in the teeth enamel. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Zou J, Guo J, Dong G, Ma L, Cong J, Liu Y, Tian Y, Wu K. Effect of the tooth surface water on the accuracy of dose reconstructions in the X-band in vivo EPR dosimetry. Appl Radiat Isot 2018; 139:86-90. [PMID: 29729486 DOI: 10.1016/j.apradiso.2018.04.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 04/23/2018] [Accepted: 04/23/2018] [Indexed: 10/17/2022]
Abstract
The X-band in vivo EPR tooth dosimetry is promising as a tool for the initial triage after a large-scale radiation accident. The dielectric losses caused by water on the tooth surface (WTS) are one of the major sources of inaccuracies in this method. The effect was studied by theoretical simulation calculations and experiments with water films of various thicknesses on teeth. The results demonstrate the possibility of sufficiently accurate measurements of the radiation-induced signal of the tooth enamel provided that the thickness of the water film on the tooth is below 60 µm. The sensitivity of the cavity decreases with increasing thickness of the water layer. The interference of WTS can be diminished by normalization of the radiation-induced signal to the signal of a reference sample permanently present in the cavity.
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Affiliation(s)
- Jierui Zou
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Junwang Guo
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Guofu Dong
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Lei Ma
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Jianbo Cong
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Ye Liu
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Ye Tian
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China
| | - Ke Wu
- Beijing Institute of Radiation Medicine, Beijing Key Laboratory of Radiation Biology (No. BZ0325), China.
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Swartz HM. Using Stable Free Radicals to Obtain Unique and Clinically Useful Data In Vivo in Human Subjects. RADIATION PROTECTION DOSIMETRY 2016; 172:3-15. [PMID: 27886997 PMCID: PMC6061194 DOI: 10.1093/rpd/ncw323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/30/2016] [Indexed: 06/06/2023]
Abstract
This paper attempts to: (1) provide a critical overview of the challenges and opportunities to extend electron paramagnetic resonance (EPR) into practical applications in human subjects, based on EPR measurements made in vivo; (2) summarize the clinical applications of EPR for improving treatments in cancer, wound healing and diabetic care, emphasizing EPR's unique capability to measure tissue oxygen repeatedly and with particular sensitivity to hypoxia and (3) summarize the capabilities of in vivo EPR to measure radiation dose for triage and medical guidance after a large-scale radiation exposure. The conclusion is that while still at a relatively early stage of its development and availability, clinical applications of EPR already have demonstrated significant value and the field is likely to grow in both the extent of its applications and its impact on significant problems.
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Affiliation(s)
- Harold M Swartz
- EPR Center for the Study of Viable Systems at Dartmouth, Department of Radiology, Geisel School of Medicine at Dartmouth, HB 7785 One Medical Center Drive, Lebanon, NH 03756, USA
- Division of Radiation Oncology, Department of Medicine, Geisel School of Medicine at Dartmouth, Lebanon, NH, USA
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Bailiff I, Sholom S, McKeever S. Retrospective and emergency dosimetry in response to radiological incidents and nuclear mass-casualty events: A review. RADIAT MEAS 2016. [DOI: 10.1016/j.radmeas.2016.09.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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