Clinical feasibility of optical surface imaging system in guiding thermoplastic body film to fix radiotherapy of pelvic tumors_West China Medical Journal

Authors：

WANG Haitao , ZHOU Jidan , ZENG Lu , YE Chengwei ,  ZHONG Renming

Department of Radiotherapy / Radiophysics Center, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

ZHONG Renming, Email: zrm_100@163.com

Keywords：

Optical surface imaging system; Pelvic tumor; Thermoplastic film; Cone beam CT

DOI：

10.7507/1002-0179.201907124

Video：

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Objective To investigate the clinical feasibility of optical surface imaging (OSI) system in guiding thermoplastic body film to fix radiotherapy of pelvic tumors.Methods From January to May in 2019, 20 pelvic tumor patients fixed with thermoplastic films were selected. After the first treatment, cone beam CT (CBCT) was performed to verify and correct the setup errors. OSI was used to collect the patient’s image information as the reference image for the later treatment setup. The later treatment was performed by traditional three-point setup, and OSI was used to record the setup data and monitor the treatment. CBCT scan results were taken as the standard, to calculate the system error (Σ), random error (σ) and margin of three-point and OSI setup. The result of CBCT scan was defined as three-point setup error.Results In lateral-medial, superior-inferior, and anterior-posterior directions, the OSI system errors were 0.14, 0.37, and 0.14 cm, respectively, the random errors were 0.20, 0.57, and 0.23 cm, respectively, and the corresponding margins were 0.49, 1.32, and 0.51 cm, respectively; the three-point setup system errors were 0.13, 0.39, and 0.12 cm, respectively, the random errors were 0.15, 0.43, and 0.13 cm, respectively, and the corresponding margins were 0.43, 1.28, and 0.39 cm, respectively. If the target coverage rate was counted at the 0.8 cm outward margin, the proportions of the three-point setup in lateral-medial, superior-inferior and anterior-posterior were 100.00%, 80.65%, and 100.00%, respectively, and those of the OSI setup were 100.00%, 95.48%, and 99.35%, respectively. Pearson analysis showed that the weakly correlation of lateral-medial, superior-inferior directions had statistical significance (P<0.05), and there was no statistical significance in the other directions (P>0.05).Conclusions Compared with the traditional three-point setup, OSI cannot improve the setup precision of thermoplastic body film fixation in pelvic tumor radiotherapy. OSI acquired the image of thermoplastic phantom, which is quite different from the actual target location of the patient. OSI application method should be improved in clinical application.

Citation： WANG Haitao, ZHOU Jidan, ZENG Lu, YE Chengwei, ZHONG Renming. Clinical feasibility of optical surface imaging system in guiding thermoplastic body film to fix radiotherapy of pelvic tumors. West China Medical Journal, 2021, 36(3): 391-395. doi: 10.7507/1002-0179.201907124 Copy

1.	李前文, 周后龙, 王正军, 等. 质量监控对放疗摆位重复性精度的影响. 东南国防医药, 2007, 9(3): 217.
2.	Sutton MW, Fontenot JD, Matthews KL, et al. Accuracy and precision of cone-beam computed tomography guided intensity modulated radiation therapy. Pract Radiat Oncol, 2014, 4(1): 67-73.
3.	Hamolia A, Kestin L, Grills I, et al. Intensity-modulated radiotherapy results in significant decrease in clinical toxicities compared with conventional wedge-based breast radiotherapy. Int J Radiat Oncol Biol Phys, 2007, 68(5): 1375-1380.
4.	Song WY, Kamath S, Ozawa S, et al. A dose comparison study between XVI and OBI CBCT systems. Med Phys, 2008, 35(2): 480-486.
5.	叶程伟, 苏鲁, 商强, 等. 光学表面成像在胸部肿瘤放射治疗中的实用性研究. 生物医学工程与临床, 2018, 22(3): 281-285.
6.	Hess CB, Thompson HM, Benedict SH, et al. Exposure risks among children undergoing radiation therapy: considerations in the era of image guided radiation therapy. Int J Radiat Oncol Biol Phys, 2016, 94(5): 978-992.
7.	Alderliesten T, Sonke JJ, Betgen A, et al. 3D surface imaging for monitoring intrafraction motion in frameless stereotactic body radiotherapy of lung cancer. Radiother Oncol, 2012, 105(2): 155-160.
8.	Blais F. Review of 20 years of range sensor development. J Electron Imaging, 2004, 13(1): 231-243.
9.	钟仁明, 叶程伟, 李丽琴, 等. 光学表面成像系统在 ABC 放疗患者作用探讨. 中华放射肿瘤学杂志, 2018, 27(1): 89-93.
10.	van Herk M, Remeijer P, Rasch C, et al. The probability of correct target dosage: dose-population histograms for deriving treatment margins in radiotherapy. Int J Radiat Oncol Biol Phys, 2000, 47(4): 1121-1135.
11.	Wikstrom K, Nilsson K, Isacson U, et al. A comparison of patient position displacements from body surface laser scanning and cone beam CT bone registrations for radiotherapy of pelvic targets. Acta Oncol (Madr), 2014, 53(2): 268-277.
12.	Stieler F, Wenz F, Scherrer D, et al. Clinical evaluation of a commercial surface-imaging system for patient positioning in radiotherapy. Strahlenther Onkol, 2012, 188(12): 1080-1084.
13.	Kim Y, Li RJ, Na YH, et al. Accuracy of surface registration compared to conventional volumetric registration in patient positioning for head-and-neck radiotherapy: a simulation study using patient date. Med Phys, 2015, 42(4): 1690-1697.
14.	Wiersma RD, Tomarken SL, Grelewicz Z, et al. Spatial and temporal performance of 3D optical surface imaging for real-time head position tracking. Med Phys, 2013, 40(11): 111712.
15.	杨露, 钟仁明, 李光俊, 等. OSI 用于引导放疗摆位精度和稳定性的研究. 中华放射肿瘤学杂志, 2018, 27(4): 387-391.
16.	Pallotta S, Marrazzo L, Ceroti M, et al. A phantom evaluation of Sentinel ^TM, a commercial laser/camera surface imaging system for patient setup verification in radiotherapy. Med Phys, 2012, 39(2): 706-712.

1. 李前文, 周后龙, 王正军, 等. 质量监控对放疗摆位重复性精度的影响. 东南国防医药, 2007, 9(3): 217.
2. Sutton MW, Fontenot JD, Matthews KL, et al. Accuracy and precision of cone-beam computed tomography guided intensity modulated radiation therapy. Pract Radiat Oncol, 2014, 4(1): 67-73.
3. Hamolia A, Kestin L, Grills I, et al. Intensity-modulated radiotherapy results in significant decrease in clinical toxicities compared with conventional wedge-based breast radiotherapy. Int J Radiat Oncol Biol Phys, 2007, 68(5): 1375-1380.
4. Song WY, Kamath S, Ozawa S, et al. A dose comparison study between XVI and OBI CBCT systems. Med Phys, 2008, 35(2): 480-486.
5. 叶程伟, 苏鲁, 商强, 等. 光学表面成像在胸部肿瘤放射治疗中的实用性研究. 生物医学工程与临床, 2018, 22(3): 281-285.
6. Hess CB, Thompson HM, Benedict SH, et al. Exposure risks among children undergoing radiation therapy: considerations in the era of image guided radiation therapy. Int J Radiat Oncol Biol Phys, 2016, 94(5): 978-992.
7. Alderliesten T, Sonke JJ, Betgen A, et al. 3D surface imaging for monitoring intrafraction motion in frameless stereotactic body radiotherapy of lung cancer. Radiother Oncol, 2012, 105(2): 155-160.
8. Blais F. Review of 20 years of range sensor development. J Electron Imaging, 2004, 13(1): 231-243.
9. 钟仁明, 叶程伟, 李丽琴, 等. 光学表面成像系统在 ABC 放疗患者作用探讨. 中华放射肿瘤学杂志, 2018, 27(1): 89-93.
10. van Herk M, Remeijer P, Rasch C, et al. The probability of correct target dosage: dose-population histograms for deriving treatment margins in radiotherapy. Int J Radiat Oncol Biol Phys, 2000, 47(4): 1121-1135.
11. Wikstrom K, Nilsson K, Isacson U, et al. A comparison of patient position displacements from body surface laser scanning and cone beam CT bone registrations for radiotherapy of pelvic targets. Acta Oncol (Madr), 2014, 53(2): 268-277.
12. Stieler F, Wenz F, Scherrer D, et al. Clinical evaluation of a commercial surface-imaging system for patient positioning in radiotherapy. Strahlenther Onkol, 2012, 188(12): 1080-1084.
13. Kim Y, Li RJ, Na YH, et al. Accuracy of surface registration compared to conventional volumetric registration in patient positioning for head-and-neck radiotherapy: a simulation study using patient date. Med Phys, 2015, 42(4): 1690-1697.
14. Wiersma RD, Tomarken SL, Grelewicz Z, et al. Spatial and temporal performance of 3D optical surface imaging for real-time head position tracking. Med Phys, 2013, 40(11): 111712.
15. 杨露, 钟仁明, 李光俊, 等. OSI 用于引导放疗摆位精度和稳定性的研究. 中华放射肿瘤学杂志, 2018, 27(4): 387-391.
16. Pallotta S, Marrazzo L, Ceroti M, et al. A phantom evaluation of Sentinel ^TM, a commercial laser/camera surface imaging system for patient setup verification in radiotherapy. Med Phys, 2012, 39(2): 706-712.

West China Medical Journal

Clinical feasibility of optical surface imaging system in guiding thermoplastic body film to fix radiotherapy of pelvic tumors

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