Dose estimation in patients treated with radiotherapy for SARS-COVID disease based on EPID measurement

Ślosarek, Krzysztof; Rutkowski, T.; Gadek, A; Sroka, Łukasz Tomasz; Dolla, Łukasz; Rutkowski, Roman; Jaroszkiewicz, Jerzy

doi:10.5603/njo.a2022.0013

Cited by 1 publication

(3 citation statements)

References 21 publications

(34 reference statements)

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“…Such a plan allows for irradiation of the EPID matrix without the patient before the first therapeutic session. Modern EPID devices are matrices of semiconductor detectors that record the radiation generated by the accelerator, measured in a plane perpendicular to the beam axis of this radiation (measurement of the so-called fluence maps) [1][2][3][4][5][6][7]. The signal is collected and saved from all detectors from the active measurement area.…”

Section: Introductionmentioning

confidence: 99%

“…The assessment is based on the gamma index, which verifies compliance with the measurement in the specified range of dose and location. [1][2][3][4][5][6][7][8][9] The gamma index calculates the difference between the dose calculated and measured at the same point (dose difference [DD]) and the distance (distance to agreement [DTA]) between points with the same dose. By determining the acceptable difference (DD) in the dose and the distance (DTA), we define the sphere within which the points located meet the compliance criterion: TPS calculations -measurement; then the value of the coefficient is less than 1 [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] The gamma index calculates the difference between the dose calculated and measured at the same point (dose difference [DD]) and the distance (distance to agreement [DTA]) between points with the same dose. By determining the acceptable difference (DD) in the dose and the distance (DTA), we define the sphere within which the points located meet the compliance criterion: TPS calculations -measurement; then the value of the coefficient is less than 1 [1][2][3][4][5][6][7]. The advantage of this method is that it does not require any phantom, and the assessment of treatment plans is quick.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of EPID portal dosimetry verification and RadCalc dose verification for VMAT treatment plans

Gądek,

Plaza,

Sroka

et al. 2024

Nowotwory. Journal of Oncology

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Introduction. Dosimetry verification is required before starting each treatment. The legal regulations do not clearly define one method of plan verification. Therefore, it is allowed to perform measurements (electronic portal imaging device [EPID]) or calculations using an independent system. Portal dosimetry using EPID matrices was compared with the RadCalcTM system v. 7.1.4.1, performing independent dose distribution calculations. Materials and methods. Treatment plans were made for 150 patients treated with the photon 6MV VMAT technique. Three groups of patients were studied: those treated for breast cancer, those treated for prostate cancer, and those irradiated to the prostate area with nodes. Then, the dosimetry verification was carried out on the accelerator using the EPID portal and compared with the independent RadCalc software calculation results. Results. Comparison of tumor proportion score (TPS) vs. EPID and vs. RC calculations for breast, prostate, and prostate with nodes showed no significant statistical differences. Regardless of the size (volume) of the clinical target volume (CTV) area, no significant difference was observed, although there was a greater agreement for large CTVs compared to small ones. Similarly, there was no significant difference in the compared methods based on depth, but there was a better agreement for small depths than large ones. Conclusions. Verification methods in the study groups showed compliance of the measured (EPID) and calculated (RadCalc) doses with the values planned in the TPS. This confirms that verification for patients treated with radiotherapy can be performed with any of these methods. However, for radiosurgical techniques, it is better to use the EPID method because the RadCalc method may give false negative results.

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