Purpose: If the horizontal plane is inconsistent between computer tomography (CT) couch and line accelerator (LA) couch, the position of the isocenter point in the radiotherapy treatment planning system (TPS) should deviate from that of it on the accelerator couch board. Then, the actual dose distribution was different from the radiotherapy plan we designed in TPS. This paper introduces a method to evaluate the dose deviation caused by the tilt of CT couch. Methods: We calculated the isocenter points of the position coordinates both in CT couch and LA couch, and compared the dose distribution when the twopositions of isocenter points were applied in radiotherapy plan independently in TPS. The dose distribution difference of a breast radiotherapyplan was analyzed as a demonstration with this method. Results: The distance between the two isocenter positions increased with angle of CT couch. The tilt of the couch had an impact on the dose distribution, especially in larynx's maximum dose parameter. Conclusion: This method could quantitatively analyze the dose distribution deviationcaused by the tilt of CT couch plate. The results can provide a valuable suggestion for clinical medical strategy.
| Published in | Radiation Science and Technology (Volume 6, Issue 3) |
| DOI | 10.11648/j.rst.20200603.11 |
| Page(s) | 27-31 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2020. Published by Science Publishing Group |
CT Couch, Line Accelerator Couch, Treatment Planning System, Isocenter Point
| [1] | Levitt S H, Khan F. Quality assurance in radiation oncology [J]. Cancer, 2015, 74 (Supplement S9): 2642-2646. |
| [2] | Mutic S, Palta JR, Butker EK, et al. Quality assurance for computed-tomography simulators and the computed-tomography-simulation process: Report of the AAPM Radiation Therapy Committee Task Group No. 66 [J]. Medical Physics, 2003, 30 (10): 2762-2792. |
| [3] | NI X Y, TANG X B, GENG C R, et al. The study of different CT bed boards on the effects of radiation therapy [J]. Chinese Clinical Oncology, 2011, 16 (04): 56-59. |
| [4] | NCC/T-RT 001-2019, Quality control guidelines for medical electronic linear accelerators [S]. |
| [5] | Saw C B, Yang Y, Li F, et al. Performance Characteristics and Quality Assurance Aspects of Kilovoltage Cone-Beam CT on Medical Linear Accelerator [J]. Medical Dosimetry, 2008, 32 (2): 80-85. |
| [6] | Accelerator beam data commissioning equipment and procedures: report of the TG-106 of the Therapy Physics Committee of the AAPM [J]. Medical Physics, 2008, 35 (9): 4186-4215. |
| [7] | Wong V Y M. Quality assurance devices for dynamic conformal radiotherapy [J]. Journal of Applied Clinical Medical Physics, 2004, 5 (1): 8-15. |
| [8] | Knill C, Snyder M. An analysis of confidence limit calculations used in AAPM Task Group No. 119 [J]. Medical Physics, 2011, 38 (4): 1779-1784. |
| [9] | Hu J, Tao J M, Sun G R. [Quality control and quality assurance for the isocentre of the medical linear accelerator]. [J]. Chinese Journal of Medical Instrumentation, 2007, 31 (3): 213. |
| [10] | Xie Qiuying, Shi Jinping, Zhang Liwen, et al. An improved method of individualized breast cancer radiotherapy immobilization technology [J]. Chinese Journal of Clinicians (Electronic Version), 2014, 7: 50-53. |
| [11] | Hong-Bin C, Wei R, Liang-Jie Y U, et al. Analysis of position set-up tolerance and advantage for breast cancer radiotherapy immobilized by vacuum mold [J]. China Oncology, 2012, 22 (04): 283-286. |
| [12] | Chen C Z, Chen Z J, Hong H G, et al. CT simulation in Radiotherapy for Breast Cancer [J]. Journal of Chinese Oncology, 2004, 10 (4): 277-278. |
| [13] | FANG JN, MA YJ, SHI JT, et al. Comparison of imbolization accuracy between styrofoam and breast carrier in intensity-modulated radiotherapy after breast conservative surgery for breast cancer patients [J]. Chin J radiation oncology, 2019, 28 (5): 369-372. |
| [14] | ZHOU SF, FANG JN, HUANG XB, et al. Preliminary study of accurate position fixation between polyurethane styrofoam and vacuum negative pressure pad in IMRT after radical mastectomy for breast cancer [J]. Chin J radiation oncology, 2019, 28 (10): 776-779. |
| [15] | Zhang P, Brisman R, Choi J, et al. Where to locate the isocenter? The treatment strategy for repeat trigeminal neuralgia radiosurgery [J]. International Journal of Radiation Oncology Biology Physics, 2005, 62 (1): 38-43. |
| [16] | Denton, T. R., Shields, L. B., Howe, J. N. and Spalding, A. C. Quantifying Isocenter Measurements to Establish Clinically Meaningful Thresholds [J]. Journal of Applied Clinical Medical Physics, 2015, 16 (2), 175-188. |
| [17] | Opp D, Forster K, Feygelman V. Commissioning compensator-based IMRT on the Pinnacle treatment planning system [J]. Journal of Applied Clinical Medical Physics, 2011, 12 (2): 3396. |
| [18] | Ramantisan S, Suryono S, Sutanto H. Physical Analysis of Radiation Dose Distribution by Using Cerrobend Compensator-Based IMRT in Linac 6 MV [J]. Journal of Computational and Theoretical Nanoence, 2017, 23 (7): 6630-6634. |
| [19] | Kaveh Shirani Tak Abi, Hassan Ali Nedaie, NooshinBanaee, et al. Step-and-Shoot versus Compensator-based IMRT: Calculation and Comparison of Integral Dose in Non-tumoral and Target Organs in Prostate Cancer [J]. Iranian Journal of Medical Physics, 2015, 12 (Winter 2015): 62-69. |
| [20] | Yuan Zhi, Wang Li. Error Analysis and Solution with Different Attenuation of CT Bed and Radiotherapy Bed [J]. Chinese Journal of Medical Instrumentation, 2014, 38 (1): 75-75. |
APA Style
Yang Bo, Zhang Jing, Li Lei, Liu Xiaolong, Pang Haowen. (2020). An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine. Radiation Science and Technology, 6(3), 27-31. https://doi.org/10.11648/j.rst.20200603.11
ACS Style
Yang Bo; Zhang Jing; Li Lei; Liu Xiaolong; Pang Haowen. An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine. Radiat. Sci. Technol. 2020, 6(3), 27-31. doi: 10.11648/j.rst.20200603.11
AMA Style
Yang Bo, Zhang Jing, Li Lei, Liu Xiaolong, Pang Haowen. An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine. Radiat Sci Technol. 2020;6(3):27-31. doi: 10.11648/j.rst.20200603.11
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Download@article{10.11648/j.rst.20200603.11,
author = {Yang Bo and Zhang Jing and Li Lei and Liu Xiaolong and Pang Haowen},
title = {An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine},
journal = {Radiation Science and Technology},
volume = {6},
number = {3},
pages = {27-31},
doi = {10.11648/j.rst.20200603.11},
url = {https://doi.org/10.11648/j.rst.20200603.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.rst.20200603.11},
abstract = {Purpose: If the horizontal plane is inconsistent between computer tomography (CT) couch and line accelerator (LA) couch, the position of the isocenter point in the radiotherapy treatment planning system (TPS) should deviate from that of it on the accelerator couch board. Then, the actual dose distribution was different from the radiotherapy plan we designed in TPS. This paper introduces a method to evaluate the dose deviation caused by the tilt of CT couch. Methods: We calculated the isocenter points of the position coordinates both in CT couch and LA couch, and compared the dose distribution when the twopositions of isocenter points were applied in radiotherapy plan independently in TPS. The dose distribution difference of a breast radiotherapyplan was analyzed as a demonstration with this method. Results: The distance between the two isocenter positions increased with angle of CT couch. The tilt of the couch had an impact on the dose distribution, especially in larynx's maximum dose parameter. Conclusion: This method could quantitatively analyze the dose distribution deviationcaused by the tilt of CT couch plate. The results can provide a valuable suggestion for clinical medical strategy.},
year = {2020}
}
TY - JOUR T1 - An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine AU - Yang Bo AU - Zhang Jing AU - Li Lei AU - Liu Xiaolong AU - Pang Haowen Y1 - 2020/09/10 PY - 2020 N1 - https://doi.org/10.11648/j.rst.20200603.11 DO - 10.11648/j.rst.20200603.11 T2 - Radiation Science and Technology JF - Radiation Science and Technology JO - Radiation Science and Technology SP - 27 EP - 31 PB - Science Publishing Group SN - 2575-5943 UR - https://doi.org/10.11648/j.rst.20200603.11 AB - Purpose: If the horizontal plane is inconsistent between computer tomography (CT) couch and line accelerator (LA) couch, the position of the isocenter point in the radiotherapy treatment planning system (TPS) should deviate from that of it on the accelerator couch board. Then, the actual dose distribution was different from the radiotherapy plan we designed in TPS. This paper introduces a method to evaluate the dose deviation caused by the tilt of CT couch. Methods: We calculated the isocenter points of the position coordinates both in CT couch and LA couch, and compared the dose distribution when the twopositions of isocenter points were applied in radiotherapy plan independently in TPS. The dose distribution difference of a breast radiotherapyplan was analyzed as a demonstration with this method. Results: The distance between the two isocenter positions increased with angle of CT couch. The tilt of the couch had an impact on the dose distribution, especially in larynx's maximum dose parameter. Conclusion: This method could quantitatively analyze the dose distribution deviationcaused by the tilt of CT couch plate. The results can provide a valuable suggestion for clinical medical strategy. VL - 6 IS - 3 ER -
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