1.5 T MR加速器临床剂量调试

doi:10.3760/cma.j.cn113030-20210906-00351

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Abstract Objective To introduce the clinical dosimetry commissioning methods and results of the 1.5 T MR-linac. Methods In May, 2019, an Elekta Unity 1.5 T MR-linac was installed in Cancer Hospital, Chinese Academy of Medical Sciences and dosimetry commissioning was performed with magnetic field compatible measuring instruments. Commissioning items include absolute dose calibration, data acquisition and planning system model verification. Results Absolute dose calibration in magnetic field should be corrected by magnetic field correction factor. The standard output dose of Unity was 87 cGy. Gamma analysis (3%/2mm) was performed on the beam collection data and the planning system calculation data. The average pass rate of dose verification of standard field test cases was 96.41%, and the TG119 test case was 98.24%. The IROC end to end test case was 97.5%(7%/4mm). Conclusions The planning system model and the beam collection data have good consistency. The dose verification results of the standard field and TG119 test cases meet the general tolerance limit requirements of the AAPM TG218 report, and the verification results of the IROC end-to-end test cases meet the IROC center standards.

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	Articles by authors
	Li Minghui
	Tian Yuan
	Zhang Ke
	Niu Chuanmeng
	Wang Hongkai
	Men Kuo
	Dai Jianrong

Key words： Magnetic resonance accelerator Dosimetry commissioning Model

Received: 06 September 2021

Corresponding Authors: Men Kuo, Email:menkuo@cicams.ac.cn;Dai Jianrong, Email:dai_jianrong@cicams.ac.cn

Cite this article:

Li Minghui,Tian Yuan,Zhang Ke et al. Clinical dosimetry commissioning of 1.5 T MR-linac[J]. Chinese Journal of Radiation Oncology, 2022, 31(1): 29-34.

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http://journal12.magtechjournal.com/Jweb_fszlx/EN/10.3760/cma.j.cn113030-20210906-00351 OR http://journal12.magtechjournal.com/Jweb_fszlx/EN/Y2022/V31/I1/29

[1] WOODINGS SJ, BLUEMINK JJ, DE VRIES J, et al. Beam characterisation of the 1.5 T MRI-linac[J]. Phys Med Biol, 2018, 63(8):085015. DOI:10.1088/1361-6560/aab566.
[2] TIJSSEN R, PHILIPPENS M, PAULSON ES, et al. MRI commissioning of 1.5 T MR-linac systems-a multi-institutional study[J]. Radiother Oncol, 2019, 132:114-120. DOI:10.1016/j.radonc.2018.12.011.
[3] WOODINGS SJ, DE VRIES J, KOK J, et al. Acceptance procedure for the linear accelerator component of the 1.5 T MRI-linac[J]. J Appl Clin Med Phys, 2021, 22(8):45-59. DOI:10.1002/acm2.13068.
[4] AHMAD SB, SARFEHNIA A, PAUDEL MR, et al. Evaluation of a commercial MRI Linac based Monte Carlo dose calculation algorithm with GEANT4[J]. Med Phys, 2016, 43(2):894-907. DOI:10.1118/1.4939808.
[5] CARSON ME, MOLINEU A, TAYLOR PA, et al. Examining credentialing criteria and poor performance indicators for IROC Houston's anthropomorphic head and neck phantom[J]. Med Phys, 2016, 43(12):6491. DOI:10.1118/1.4967344.
[6] ANDREO P, HUQ MS, WESTERMARK M, et al. Protocols for the dosimetry of high-energy photon and electron beams:a comparison of the IAEA TRS-398 and previous international codes of practice. International Atomic Energy Agency[J]. Phys Med Biol, 2002, 47(17):3033-3053. DOI:10.1088/0031-9155/47/17/301.
[7] DE PREZ L, WOODINGS S, DE POOTER J, et al. Direct measurement of ion chamber correction factors, k (Q) and k (B), in a 7 MV MRI-linac[J]. Phys Med Biol, 2019, 64(10):105025. DOI:10.1088/1361-6560/ab1511.
[8] RAAYMAKERS BW, JüRGENLIEMK-SCHULZ IM, BOL GH, et al. First patients treated with a 1.5 T MRI-Linac:clinical proof of concept of a high-precision, high-field MRI guided radiotherapy treatment[J]. Phys Med Biol, 2017, 62(23):L41-L50. DOI:10.1088/1361-6560/aa9517.
[9] MORALES JE, CROWE SB, HILL R, et al. Dosimetry of cone-defined stereotactic radiosurgery fields with a commercial synthetic diamond detector[J]. Med Phys, 2014, 41(11):111702. DOI:10.1118/1.4895827.
[10] WOODINGS SJ, WOLTHAUS J, VAN ASSELEN B, et al. Performance of a PTW 60019 microDiamond detector in a 1.5 T MRI-linac[J]. Phys Med Biol, 2018, 63(5):05NT04. DOI:10.1088/1361-6560/aaa1c6.
[11] AGNEW J, O&#39, GRADY F, et al. Quantification of static magnetic field effects on radiotherapy ionization chambers[J]. Phys Med Biol, 2017, 62(5):1731-1743. DOI:10.1088/1361-6560/aa5876.
[12] HOUWELING AC, DE VRIES JH, WOLTHAUS J, et al. Performance of a cylindrical diode array for use in a 1.5 T MR-linac[J]. Phys Med Biol, 2016, 61(3):N80-89. DOI:10.1088/0031-9155/61/3/N80.
[13] LAGENDIJK JJ, VAN VULPEN M, RAAYMAKERS BW. The development of the MRI linac system for online MRI-guided radiotherapy:a clinical update[J]. J Intern Med, 2016, 280(2):203-208. DOI:10.1111/joim.12516.
[14] 李明辉,田源张可等 1.5 T磁共振加速器X线束剂量学特性测试[J] 中华放射肿瘤学杂志 2020, 29(11):963-967. DOI:10.3760/cma.j.cn113030-20200516-00257.
LI MH, TIAN Y, ZHANG K,et al. Dosimetric characteristics test of 1.5 T magnetic resonance accelerator[J]. Chin J Radiat Oncol, 2020, 29(11):963-967. DOI:10.3760/cma.j.cn113030-20200516-00257.