Image-Guided Radiotherapy Power Supply: Tumor Motion Tracking and Dose Compensation

During radiotherapy, tumor motion caused by respiration or organ displacement can result in misalignment of the radiation beam, affecting dose distribution. Image-guided radiotherapy systems rely on real-time imaging feedback to track tumor position, while the high-voltage power supply provides rapid, precise control of accelerator output energy and beam intensity.
The power supply features digital high-speed regulation capable of microsecond-level voltage adjustment. It receives real-time tumor displacement data from imaging modules and computes the required dose compensation for each treatment pulse. Adjustments are applied by modulating acceleration voltage and pulse frequency, ensuring that the delivered dose matches the tumor’s instantaneous position.
Continuous, linear energy output is critical. Multi-stage power amplification and fast feedback loops prevent voltage overshoot and maintain stable beam characteristics during dynamic dose modulation. Radiation sensors integrated within the beamline provide instantaneous feedback on beam intensity, allowing the controller to correct any deviation and maintain dose precision better than 1%.
Predictive algorithms estimate tumor trajectory based on prior motion patterns, enabling anticipatory voltage adjustments and pre-compensation of beam energy. This approach maintains accurate spatial dose distribution, minimizes irradiation of healthy tissue, and supports truly adaptive, real-time radiotherapy.