Abstract
Purpose: If the horizontal plane is inconsistent between computer tomography (CT) couch and line accelerator (LA) couch, the position of the isocenter point in the radiotherapy treatment planning system (TPS) should deviate from that of it on the accelerator couch board. Then, the actual dose distribution was different from the radiotherapy plan we designed in TPS. This paper introduces a method to evaluate the dose deviation caused by the tilt of CT couch. Methods: We calculated the isocenter points of the position coordinates both in CT couch and LA couch, and compared the dose distribution when the twopositions of isocenter points were applied in radiotherapy plan independently in TPS. The dose distribution difference of a breast radiotherapyplan was analyzed as a demonstration with this method. Results: The distance between the two isocenter positions increased with angle of CT couch. The tilt of the couch had an impact on the dose distribution, especially in larynx's maximum dose parameter. Conclusion: This method could quantitatively analyze the dose distribution deviationcaused by the tilt of CT couch plate. The results can provide a valuable suggestion for clinical medical strategy.
Highlights
In radiotherapy, the couch of computer tomography (CT) simulation machine and the couch of radiotherapy linear accelerator (LA) should be horizonta l [1, 2]
The horizontal plane is inconsistent between CT couch and accelerator couch
The actual dose distribution in LA was different from the plan we designed in treatment planning system (TPS)
Summary
The couch of computer tomography (CT) simulation machine and the couch of radiotherapy linear accelerator (LA) should be horizonta l [1, 2]. Due to the aging of the CT machine, the CT couchmight tilt. The horizontal plane is inconsistent between CT couch and accelerator couch. This maycause the position of the isocenter pointin the radiotherapy treatment planning system (TPS) was inconsistent with that of the isocenter point on the LA couch. According to an example of a breast cancer radiotherapy plan, we calculated the dose difference in this method for a specific analysis. Yang Bo et al.: An Analysis Method of Dose Error Caused by the Couch Tilt of CT Simulation Machine
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