Evaluation of the Setup Error using On-Board Imager (OBI) System in Upper Abdominal Cancer

Authors

  • Natchayaporn Thonapan Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Wilai Masa-Nga Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Sawanee Suntiwong Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Kittipol Dachaworakol Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Sangutid Thongsawat Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Chirasak Khamfongkhruea Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand
  • Chirapha Tannanonta Department of Radiation Oncology Unit, Chulabhorn Hospital. Bangkok. Thailand

Abstract

Purpose: To study the setup error of patient’s positioning in upper abdominal cancer.

Materials and Methods: Eleven patients with upper abdominal cancer treated by 3D-CRT and IMRT techniques were studied during June 2008 to February 2009. Pre-treatment process began when two images in AP and Lat views of the patient were captured by using the OBI (Onboard Imager) System that attached with the linear accelerator machine. These two images were overlaid with the reference DRR (Digital reconstruction radiograph) of the planning CT (in the same views). As a consequence. the setup or couch position errors compared with the treatment planning values in three directions were calculated by the OBI software. Once the shifts applied, the couch had automatically moved to the right positions before treating the patient.

Results: For 134 OBI sessions. the average errors were 0.18±0.14 cm (0 - 0.7 cm), 0.24±0.22 cm (0-1.0 cm) and 0.21±0.18 cm (0 - 0.7 cm) in vertical (Vrt). longitudinal (Lng) and lateral (Lat) directions respectively. The maximum setup error was 1.0 cm in the Lng direction for a single patient. However. the errors within 0.5 cm in these three directions resulted as 99%, 88%, and 93%.

Conclusion: Most of the setup error values were acceptable within 0.5 cm in the entire directions; Vrt, Lng and Lat. Using OBI system, the patients were typically treated in the same position as mentioned in the treatment planning that helps to increase tumor control probability and decreasing complication rate.

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References

Philips MH. Singer K, Miller E, Stelzer K. Commissioning an image-guided localization system for radiotherapy. Int J Radiat Oncol Biol Phys 2000:48:267-76

Marks JE. Haus AG. The effect of immobilization on localization error in the radiotherapy of head and neck cancer. Clinical Radiology 1976;27:175-7.

Goitein M, Busse J. Immobilization error: some theoretical considerations. Radiology 1975;117:407-12

Hurkmans CW. Remeijer P, Lebesque JV, Mijnheer Bu. Set-up verification using portal imaging: review of current clinical practice. Radiotherapy Oncology. 2001: 58:105-20.

Bel A. Van Herk M. Bartilink H. Lebesque JV. A verification procedure to improve patient set-up accuracy using portal images. Radiotherapy Oncology. 1993:29:253-60

Chyty K, McCurdy BM. Comprehensive fluence model for absolute portal dose image prediction. Med Phys 2009:36:1389-98.

Hong LX. Chen CC, Garg M, Yaparpalvi R. Mah D. Clinical experiences with onboard imager KV images for inear accelerator-based stereotactic radiosurgery and radiotherapy setup. Int J Radiat Oncol Biol Phys 2009;73: 556-61.

Fox T. Huntzinger C. Johntone P. et al. Performance evaluation of an automated image registration algorithm using an integrated kilovoltage imaging and guidance system. Applied Clinical Medical Physics 2006:7:97-104.

Charles LP. Fox T, Elder E, et al. Image-Guided Radiation Therapy (IGRT) in gastrointestinal tumors. Journal of the Pancreas 2006:7:372-81

Kutcher GJ, Mageras GS. Liebe! SA Control, Correction. and Modeling of Setup Errors and Organ Motion. Seminars in Radiation Oncology 1995:5:134-45

Mah D. Hanley J. Rosenzweig KE. et al. Technical aspects of the deep inspiration breath-hold technique in the treatment of thoracic cancer. Int J Radiat Oncol Biol Phys 2000:48:1175-85.

Wong JW. Sharpe MB, Jaffray DA, et al. The use of active breathing control (ABC) to reduce margin for breathing motion. Int J Radiat Oncol Biol Phys 1999:44: 911-9.

Malone S, Szanto J, Perry G, et al. A perspective comparison of three systems of patient Immobilization for prostate radiotherapy. Int J Radiat Oncol Bio! Phys 2000:48:657-65

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Published

2023-04-28

How to Cite

1.
Thonapan N, Masa-Nga W, Suntiwong S, Dachaworakol K, Thongsawat S, Khamfongkhruea C, et al. Evaluation of the Setup Error using On-Board Imager (OBI) System in Upper Abdominal Cancer. ASEAN J Radiol [Internet]. 2023 Apr. 28 [cited 2024 Dec. 11];16(2):117-21. Available from: https://www.asean-journal-radiology.org/index.php/ajr/article/view/849

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