Prog Med Phys.  2016 Dec;27(4):189-195. 10.14316/pmp.2016.27.4.189.

Feasibility Study of a Custom-made Film for End-to-End Quality Assurance Test of Robotic Intensity Modulated Radiation Therapy System

• Kim J
• Park K
• Yoon J
• Lee E
• Cho S
• Ahn S
• Park J
• Choi W
• Lee H

• KMID: 2376551
• DOI: http://doi.org/10.14316/pmp.2016.27.4.189

Abstract

This paper aims to verify the clinical feasibility of a custom-made film created by a laser cutting tool for End-to-End (E2E) quality assurance in robotic intensity modulated radiation therapy system. The custom-made film was fabricated from the Gafchromic EBT3 film with the size of 8"×10" using a drawing that is identical to the shape and scale of the original E2E film. The drawing was created by using a computer aided design program with the image file, which is obtained by scanning original E2E film. Beam delivery and evaluations were respectively performed with the original film and the custom-made film using fixed-cone collimator on three tracking modes: 6D skull (6DS), Xsight spine (XS), and Xsight lung (XL). The differences between total targeting errors of the original and custom-made films were recorded as 0.17 mm, 0.3 mm, and 0.17 mm at 6DS, XS, and XL tracking modes, respectively. This indicates that the custom-made film could yield nearly equivalent results to those of the original E2E film, given the uncertainties caused by distortions during film scanning and vibrations associated with film cutting. By confirming the clinical feasibility of a custom-made film for E2E testing, it can be expected that economic efficiency of the testing will increase accordingly.

Keyword

End-to-End test; Quality assurance; CyberKnife; Robotic IMRT

MeSH Terms

Computer-Aided Design
Feasibility Studies*
Lung
Skull
Spine
Vibration

Figure

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  Fig. 1. Overview of robotic IMRT M6 system.

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  Fig. 2. Drawing an assembly diagram for E2E test (using Q-CAD program).

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  Fig. 3. Laser cutting machine (Microlaser C40, CORYART).

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  Fig. 4. Setting parameters: the size and the area of the film to be cut.

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  Fig. 5. Setting parameters: laser cutting start point, step distance, laser speed, and so forth.

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  Fig. 6. Setting parameters: laser speed and power, On/Off delay time, and so forth.

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  Fig. 7. (a) The ball cube for 6DS tracking mode test. (b) A pair of custom-made films for 6DS tracking mode test. (c) Head-and-Neck phantom used for static tracking modes. (d) The mini ball cube for XS tracking mode test. (e) A pair of custom-made films for XS tracking mode test.

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  Fig. 8. (a) Xsight Lung Tracking Phantom kit. (b) The film cube located in the moving rod. (c) A pair of custom-made films for XLT mode test.

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