Research on the correction method for radiotherapy verification plans based on displaced electronic portal imaging device

Background It has been observed that under the single isocenter conditions, the potential shifts of the electronic portal imaging devices (EPID) may be introduced when executing portal dosimetry (PD) plans for bilateral breast cancer, pleural mesothelioma, and lymphoma. These shifts are relative to...

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Vydáno v:Journal of applied clinical medical physics Ročník 25; číslo 8; s. e14401 - n/a
Hlavní autoři: Guo, Jian, Zhou, Leyuan, Zeng, Haibin
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States John Wiley & Sons, Inc 01.08.2024
John Wiley and Sons Inc
Témata:
Breast cancer
Calibration
electronic portal imaging device (EPID)
Experiments
Female
Humans
Neoplasms - radiotherapy
Organs at Risk - radiation effects
Particle Accelerators - instrumentation
Patient Portals
Phantoms, Imaging
plan verification
portal dosimetry (PD)
Quality control
Radiation Oncology Physics
Radiation therapy
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy, Intensity-Modulated - methods
portal dosimetry (PD)
plan verification
electronic portal imaging device (EPID)
ISSN:1526-9914, 1526-9914
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Popis
Shrnutí:Background It has been observed that under the single isocenter conditions, the potential shifts of the electronic portal imaging devices (EPID) may be introduced when executing portal dosimetry (PD) plans for bilateral breast cancer, pleural mesothelioma, and lymphoma. These shifts are relative to the calibration positions of EPID and result in significant discrepancies in the plan verification results. Purpose To explore methods including correction model and specific correction matrices to revise the data obtained from displaced EPID. Methods Two methods, the correction model and the specific correction matrices, were applied to correct the data. Five experiments were designed and conducted to build correction model and to validate the effectiveness of these two methods. Gamma passing rates were calculated and data profiles along X‐axis and Y‐axis were captured. Results The gamma passing rates for the EPID‐displaced IMRT validation plans after applying correction model, along with the application of specific correction matrices to VMAT and IMRT validation plans, exhibit results that are comparable to the cases with non‐displaced EPID. Except for the VMAT plans applied correction model which showed larger discrepancies (0.041 ± 0.028, 0.049 ± 0.030), the other three exhibit minimal differences in discrepancy values. In all profiles, the corrected data from displaced EPID exhibit a high level of agreement with data obtained from non‐displaced EPID. Good consistency is observed in actual application of the correction model and the specific correction matrices between gamma passing rates of data corrected and those of non‐displaced data. Conclusions The proposed methods involving correction model and specific correction matrices can correct the data collected from the displaced EPID, and the gamma passing rates of the corrected data show results that are comparable to some extent with those of non‐displaced data. Particularly, the results corrected by specific correction matrices closely resemble the data from non‐displaced EPID.
Bibliografie:Jian Guo and Leyuan Zhou contributed equally to this work.
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ISSN:1526-9914
1526-9914
DOI:10.1002/acm2.14401