Factors influencing real-time 3D surface image-guided for patient setup in radiotherapy
Keywords:
Real-time 3D surface tracking, Real-time 3D surface tracking, non-ionizing radiation, IGRTAbstract
Background: The real-time 3D surface image-guide system (AlignRT) is applied to verify the patient position before treatment and can monitor the patient movement during treatment.
Objective: To study the characteristics and contributing factors of AlignRT.
Materials and Methods: The AlignRT system was installed at Varian TrueBeam linac room. The position errors of phantom were used to study in various parameters such as the effect of gantry angle, room light, skin tone protocol, region of interest, couch angle and time.
Results: From the study, it was found that the gantry angle effect was within 0.3 mm for the range of 100-260 degree. The uncertainty increased in case of dim light in the room with maximum of 0.9 mm. For skin tone protocol, the uncertainty reduced if the matching skin tone was selected. A smaller ROI than 10 x10 cm2, small at center, displayed less errors compared with large ROI such as total body, half left or half right. For couch angle effect, the uncertainties were high in the range -40 to 60 degrees and 40 to 60 degrees with the uncertainty range from -1.3 to 1.1 mm. The time of using machine did not affect the accuracy of the system.
Conclusions: The characteristics of AlignRT system were in good condition with small uncertainty. The highest uncertainty was found at couch angle effect, while the gantry angle and time of used had the smallest effect. The other parameters showed small effect. In conclusion, the
AlignRT was a good system because the uncertainties were within 1.5 mm from all factors. It was possible to increase the accuracy of patient positioning.
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