The Impact of High-Voltage Generator Inverter Frequency on Imaging Performance of Digital Radiography (DR) Systems

This paper begins with an introduction and analysis of the principles and structure inside the high-voltage generator, and for the first time proposes the viewpoint that using an inverter to increase the inverter frequency can enhance the imaging performance of the digital X-ray imaging system (DR). The theoretical basis for using an inverter to increase the inverter frequency to eliminate ripple is analyzed. Based on the characteristics of ripple, a PWM inverter circuit based on IGBT (Insulated Gate Bipolar Transistor) is designed to suppress the ripple generated inside the high-voltage generator. For the first time, DQE (Detective Quantum Efficiency) is introduced to quantitatively analyze the DR imaging performance before and after the installation of the inverter, in order to verify whether the addition of the inverter frequency module has improved the imaging performance.