Feasibility of proton daily QA prototype for pencil beam scanning carbon ion beam therapy

The DQA-P prototype demonstrated feasibility for daily QA in PBS carbon ion beam therapy, offering a short overall measurement time of approximately 5 min, efficient data acquisition, and simultaneous multiparameter verification within a single setup. This is a significant improvement on the conventional daily QA procedure, which uses two different detector types for independent dose and spot position measurements. In the standard workflow, both detectors must be positioned individually using the in-room laser system, connected to the readout electronics and irradiated using the daily beam plan. Altogether, this procedure takes around 15-20 min. Although certain limitations remain-particularly in spot size accuracy and range determination-the device showed sufficient sensitivity and stability for daily QA purposes. Its use has the potential to streamline QA procedures, reduce beam time, and enhance workflow efficiency in carbon ion therapy.