Prog Med Phys.  2017 Sep;28(3):92-99. 10.14316/pmp.2017.28.3.92.

Development of a Real-Time Internal and External Marker Based Gating System for Proton Therapy

• Cho J
• Cheon W
• Ahn S
• Lee M
• Park HC
• Han Y

• KMID: 2393369
• DOI: http://doi.org/10.14316/pmp.2017.28.3.92

Abstract

In respiratory-induced proton therapy, the accuracy of tracking system and beam controlling is more important than photon therapy. Therefore, a high accuracy motion tracking system that can track internal marker and external surrogate is needed. In this research, our team has installed internal and external marker tracking system at our institution's proton therapy system, and tested the scanning with gating according to the position of marker. The results demonstrate that the developed in-house external/internal marker based gating system can be clinically used for proton therapy system for moving tumor treatment.

Keyword

Proton therapy; Respiratory gating; Internal/external fiducials; Marker tracking

MeSH Terms

Proton Therapy*
Protons*
Protons

Figure

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  Fig. 1. The flat panel detectors (FPD) at the gantry of our institution.

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  Fig. 2. The concept of finding the 3D coordinates of marker in biplane images (The two blue rectangles represent FPD's biplane images).

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  Fig. 3. The Bonita 10 camera (left) and the Nexus software (right).

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  Fig. 4. The real time output status of the ‘Co-registration Algorithm’. The boxes on the left side of the monitor show the coordinates of the three external markers, and the box on the right shows the 3D coordinates of the internal marker in millimeter scale.

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  Fig. 5. Current proton therapy system at our institution.

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  Fig. 6. Modified proton therapy system which is able to gate the beam based on external/internal marker's position.

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  Fig. 7. A sliding motion phantom was placed on a couch for phantom simulation.

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  Fig. 8. The gamma analysis result for case 1 with the anzai external respiratory gating.

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  Fig. 9. The gamma analysis result for case 1 with the modified system's respiratory gating.

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  Fig. 10. The gamma analysis result for case 2 with the anzai external respiratory gating.

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  Fig. 11. The gamma analysis result for case 2 with the modified system's respiratory gating.

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