Application of Liner-accelerator Two-degrade Collimator in the Treatment of Nasopharyngeal Carcinoma with Volumetric Modulated Arc Therapy_West China Medical Journal

Authors：

 JIChuan-xian ^1,2 ,  BAISen ¹ , LIGuang-jun ¹ , JIANGXiao-qin ¹ , XIAOJiang-hong ¹

1. Department of Radiation Physics and Technology Center, West China Hospital;
2. College of Physical Sicence and Technology;Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

BAISen, Email: baisen@scu.edu.cn

Keywords：

Two-degrade collimator; Nasopharyngeal carcinoma; Volumetric intensity-modulated radiotherapy

DOI：

10.7507/1002-0179.20150355

Video：

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Abstract Full text Figures/Tables Video References Cited by

Objective Compare the two-degrade collimator (MLC) angle selection's impact on plan quality and operational efficiency for volumetric intensity-modulated radiotherapy (VMAT) in the treatment planning system, and to explore the scheme for treatment plan optimization. Methods Twenty patients with nasopharyngeal carcinoma underwent the treatment between March and December 2013 were randomly selected and planned for SIBVMAT treatment with different parameters set in the range of 0-60°with 15°interval for collimator angles. Planned dose distribution to the target volumes, organs at risk, and monitor units were compared. Results As the MLC angle increased, target conformal index and homogeneity index had a trend to became deteriorated. The optimal plans were 0°and 15°, while 45°and 60°plans gave poor protection for the organ at risk compare to other angle plans and the monitor units were significantly increased. Conclusion Change the MLC angle had visible impact on treatment plans,there was a trend to deteriorate with the MLC angle increased, but small changes in MLC angle range can theoretically reduce the influence from leakage radiation on the human body.

Citation： JIChuan-xian, BAISen, LIGuang-jun, JIANGXiao-qin, XIAOJiang-hong. Application of Liner-accelerator Two-degrade Collimator in the Treatment of Nasopharyngeal Carcinoma with Volumetric Modulated Arc Therapy. West China Medical Journal, 2015, 30(7): 1235-1238. doi: 10.7507/1002-0179.20150355 Copy

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4.	Treutwein M, Hipp M, Koelbl O, et al. Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer[J]. Radiat Oncol, 2012, 7:108.
5.	Kuijper IT, Dahele M, Senan S, et al. Volumetric modulated arc therapy versus conventional intensity modulated radiation therapy for stereotactic spine radiotherapy:a planning study and early clinical data[J]. Radiother Oncol, 2010, 94(2):224-228.
6.	赵充, 卢泰祥, 韩非, 等. 139例鼻咽癌调强放疗的临床研究[J]. 中华放射肿瘤学杂志, 2006, 15(1):1-6.
7.	ICRU. Prescribing, recording, and reporting photon-beam intensitymodulated radiation therapy (IMRT)[J]. J ICRU, 2010, 10(1):34-36.
8.	Feuvret L, Noël G, Mazeron JJ, et al. Conformity index:a review[J]. Int J Radiat Oncol Biol Phys, 2006, 64(2):333-342.
9.	Lee TF, Chao PJ, Ting HM, et al. Comparative analysis of SmartArcbased dual arc volumetric-modulated arc radiotherapy (VMAT) versus intensity-modulated radiotherapy (IMRT) for nasopharyngeal carcinoma[J]. J Appl Clin Med Phys, 2011, 12(4):3587.
10.	Rao M, Yang W, Chen F, et al. Comparison of Elekta VMAT with helical tomotherapy and fixed field IMRT:plan quality, delivery efficiency and accuracy[J]. Med Phys, 2010, 37(3):1350-1359.
11.	Guckenberger M, Richter A, Krieger T, et al. Is a single arc sufficient in volumetric-modulated arc therapy (VMAT) for complex-shaped target volumes?[J]. Radiother Oncol, 2009, 93(2):259-265.
12.	Boylan CJ, Golby C, Rowbottom CG. A VMAT planning solution for prostate patients using a commercial treatment planning system[J]. Phys Med Biol, 2010, 55(14):N395-N404.
13.	Jordan TJ, Williams PC. The design and performance characteristics of a multileaf collimator[J]. Phys Med Biol, 1994, 39(2):231-251.
14.	Galvin JM, Smith AR, Lally B. Characterization of a multileaf collimator system[J]. Int J Radiat Oncol Biol Phys, 1993, 25(2):181-192.
15.	李长虎, 张春莉, 徐利明, 等. 多叶准直器角度因素对调强放疗计划实施效率的影响[J]. 中华放射肿瘤学杂志, 2013, 22(6):482-484.
16.	Yang Y, Zhang P, Happersett L, et al. Choreographing couch and collimator in volumetric modulated arc therapy[J]. Int J Radiat Oncol Biol Phys, 2011, 80(4):1238-1247.
17.	Mancosu P, Cozzi L, Fogliata A, et al. Collimator angle influence on dose distribution optimization for vertebral metastases using volumetric modulated arc therapy[J]. Med Phys, 2010, 37(8):4133-4137.
18.	Martin S, Chen JZ, Rashid Dar A, et al. Dosimetric comparison of helical tomotherapy, RapidArc, and a novel IMRT & Arc technique for esophageal carcinoma[J]. Radiother Oncol, 2011, 101(3):431-437.
19.	Chen JZ, Chen CZ, Atwood TF, et al. Volumetric modulated arc therapy planning method for supine craniospinal irradiation[J]. J Radiat Oncol, 2012, 1(3):291-297.
20.	Webb S. Does the option to rotate the Elekta Beam Modulator MLC during VMAT IMRT delivery confer advantage? A study of "parked gaps"[J]. Phys Med Biol, 2010, 55(11):N303-N319.

1. Bedford JL, Warrington AP. Commissioning of volumetric modulated arc therapy (VMAT)[J]. Int J Radiat Oncol Biol Phys, 2009, 73(2):537-545.
2. Bedford JL. Treatment planning for volumetric modulated arc therapy[J]. Med Phys, 2009, 36(11):5128-5138.
3. Otto K. Volumetric modulated arc therapy:IMRT in a single gantry arc[J]. Med Phys, 2008, 35(1):310-317.
4. Treutwein M, Hipp M, Koelbl O, et al. Searching standard parameters for volumetric modulated arc therapy (VMAT) of prostate cancer[J]. Radiat Oncol, 2012, 7:108.
5. Kuijper IT, Dahele M, Senan S, et al. Volumetric modulated arc therapy versus conventional intensity modulated radiation therapy for stereotactic spine radiotherapy:a planning study and early clinical data[J]. Radiother Oncol, 2010, 94(2):224-228.
6. 赵充, 卢泰祥, 韩非, 等. 139例鼻咽癌调强放疗的临床研究[J]. 中华放射肿瘤学杂志, 2006, 15(1):1-6.
7. ICRU. Prescribing, recording, and reporting photon-beam intensitymodulated radiation therapy (IMRT)[J]. J ICRU, 2010, 10(1):34-36.
8. Feuvret L, Noël G, Mazeron JJ, et al. Conformity index:a review[J]. Int J Radiat Oncol Biol Phys, 2006, 64(2):333-342.
9. Lee TF, Chao PJ, Ting HM, et al. Comparative analysis of SmartArcbased dual arc volumetric-modulated arc radiotherapy (VMAT) versus intensity-modulated radiotherapy (IMRT) for nasopharyngeal carcinoma[J]. J Appl Clin Med Phys, 2011, 12(4):3587.
10. Rao M, Yang W, Chen F, et al. Comparison of Elekta VMAT with helical tomotherapy and fixed field IMRT:plan quality, delivery efficiency and accuracy[J]. Med Phys, 2010, 37(3):1350-1359.
11. Guckenberger M, Richter A, Krieger T, et al. Is a single arc sufficient in volumetric-modulated arc therapy (VMAT) for complex-shaped target volumes?[J]. Radiother Oncol, 2009, 93(2):259-265.
12. Boylan CJ, Golby C, Rowbottom CG. A VMAT planning solution for prostate patients using a commercial treatment planning system[J]. Phys Med Biol, 2010, 55(14):N395-N404.
13. Jordan TJ, Williams PC. The design and performance characteristics of a multileaf collimator[J]. Phys Med Biol, 1994, 39(2):231-251.
14. Galvin JM, Smith AR, Lally B. Characterization of a multileaf collimator system[J]. Int J Radiat Oncol Biol Phys, 1993, 25(2):181-192.
15. 李长虎, 张春莉, 徐利明, 等. 多叶准直器角度因素对调强放疗计划实施效率的影响[J]. 中华放射肿瘤学杂志, 2013, 22(6):482-484.
16. Yang Y, Zhang P, Happersett L, et al. Choreographing couch and collimator in volumetric modulated arc therapy[J]. Int J Radiat Oncol Biol Phys, 2011, 80(4):1238-1247.
17. Mancosu P, Cozzi L, Fogliata A, et al. Collimator angle influence on dose distribution optimization for vertebral metastases using volumetric modulated arc therapy[J]. Med Phys, 2010, 37(8):4133-4137.
18. Martin S, Chen JZ, Rashid Dar A, et al. Dosimetric comparison of helical tomotherapy, RapidArc, and a novel IMRT & Arc technique for esophageal carcinoma[J]. Radiother Oncol, 2011, 101(3):431-437.
19. Chen JZ, Chen CZ, Atwood TF, et al. Volumetric modulated arc therapy planning method for supine craniospinal irradiation[J]. J Radiat Oncol, 2012, 1(3):291-297.
20. Webb S. Does the option to rotate the Elekta Beam Modulator MLC during VMAT IMRT delivery confer advantage? A study of "parked gaps"[J]. Phys Med Biol, 2010, 55(11):N303-N319.

West China Medical Journal

Application of Liner-accelerator Two-degrade Collimator in the Treatment of Nasopharyngeal Carcinoma with Volumetric Modulated Arc Therapy

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