[논문]VitalBeam 선형가속기의 심부선량백분율과 측방선량분포 측정을 위한 새로운 기준 전리함으로서 스텔스 전리함의 성능 평가

김연래; 정진범; 강성희; 강상원; 김경현; 정재용; 신영주; 서태석; 이정우

doi:10.17946/jrst.2018.41.3.201

VitalBeam 선형가속기의 심부선량백분율과 측방선량분포 측정을 위한 새로운 기준 전리함으로서 스텔스 전리함의 성능 평가
Performance Evaluation of Stealth Chamber as a Novel Reference Chamber for Measuring Percentage Depth Dose and Profile of VitalBeam Linear Accelerator 원문보기

방사선기술과학 = Journal of radiological science and technology, v.41 no.3, 2018년, pp.201 - 207

김연래 (춘해보건대학교 방사선과) , 정진범 (분당서울대학교 방사선종양학과) , 강성희 (분당서울대학교 방사선종양학과) , 강상원 (가톨릭대학교 의공학교실) , 김경현 (가톨릭대학교 의공학교실) , 정재용 (상계백병원 방사선종양학과) , 신영주 (상계백병원 방사선종양학과) , 서태석 (가톨릭대학교 의공학교실) , 이정우 (건국대학교병원 방사선종양학과)

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The purpose of this study is to evaluate the performance of a "stealth chamber" as a novel reference chamber for measuring percentage depth dose (PDD) and profile of 6, 8 and 10 MV photon energies. The PDD curves and dose profiles with fields ranging from $3{\times}3$ to $25{\times}25cm^2$ were acquired from measurements by using the stealth chamber and CC 13 chamber as reference chamber. All measurements were performed with Varian VitalBeam linear accelerator. In order to assess the performance of stealth chamber, PDD curves and profiles measured with stealth chamber were compared with measurement data using CC13 chamber. For PPDs measured with both chambers, the dosimetric parameters such as $d_{max}$ (depth of maximum dose), $D_{50}$ (PDD at 50 mm depth), and $D_{100}$ (PDD at 100 mm depth) were analyzed. Moreover, root mean square error (RMSE) values for profiles at $d_{max}$ and 100 mm depth were evaluated. The measured PDDs and profiles between the stealth chamber and CC13 chamber as reference detector had almost comparable. For PDDs, the evaluated dosimetric parameters were observed small difference (<1%) for all energies and field sizes, except for $d_{max}$ less than 2 mm. In addition, the difference of RMSEs for profiles at $d_{max}$ and 100 mm depth was similar for both chambers. This study confirmed that the use of stealth chamber for measuring commission beam data is a feasible as reference chamber for fields ranging from $3{\times}3$ to $20{\times}20cm^2$. Furthermore, it has an advantage with respect to measurement of the small fields (less than $3{\times}3cm^2$ field) although not performed in this study.

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Dose profiles of open beam were measured for all beam energies for various field sizes at the maximum dose depth (d_max) 10 ㎝ depth (d₁₀₀). Beam profile data were first smoothened by the least-square method and were corrected to make symmetrical them. After that beam profiles were rescaled at the central axis.
Specially, adjustment of a reference chamber for the small filed is needed to prevent the field chamber being covered with shadow of reference chamber. In this study, PDD and profiles revealed comparable dosimetric parameters measured with the Stealth chamber and our gold standard, the CC13 chamber, as reference and field chamber, respectively.
In this study, we aimed to evaluate the performance of a stealth chamber as a novel reference chamber through comparison of the percentage depth doses (PDDs) and dose profiles measured with CC13 and stealth chambers while measuring commissioning beam data of 6, 8 and 10 MV photon energies for a newly introduced linear accelerator.
Percentage depth dose (PDD) measurements were taken with a fixed source-to-surface distance (SSD) customarily at 100 ㎝ distance for various open fields ranging from 3 × 3 to 25 × 25 ㎠.

이론/모형

6 × r_cav) is taken into account in software setting itself. All measured PDD curves were fitted by the least-square method. Dose profiles of open beam were measured for all beam energies for various field sizes at the maximum dose depth (d_max) 10 ㎝ depth (d₁₀₀).
As shown in Figure 1, PDD curves and depth dose profiles were measured in 3D blue water phantom (IBA Dosimetry GmbH, Germany) using CC13 (Scanditronix-Wellhofer, IBA Dosimetry GmbH, Schwarzenbruck, Germany) and stealth chamber for 6, 8 and 10 MV photon energies. All measurements for both chambers were performed with Varian VitalBeam linear accelerator[9].

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LAV Quino, CIH Hernandez, O Calvo, M Deweese. Evaluation of a novel reference chabmer "stealth chamber" through Monte Carlo simulations and experimental data, Int J Cancer Ther Oncol. 2015; 3(2):3222.
Koo KL, Yang ON, Lim CH, Choi WS, Shin SS, Ahn WS. Dosimetric characteristics of detectors in measurement of beam data for small fields of linear accelerator, Journal of Radiological Science and Technology. 2012;35(3):265-273.
Quino LAV, Hernandez CIH, Calvo O, Rangaraj D. Clinical experience with a novel reference chamber "stealth chamber" by IBA, AIP Conf. Proc 1747, 040006, 2016.
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