A fluoroscopy system using a dynamic flat panel image receptor as compared to conventional fluoroscopy requires:

A fluoroscopy system that employs a dynamic flat panel image receptor necessitates a higher x-ray tube current compared to conventional fluoroscopy systems. This is primarily due to the technological advancements and operational requirements of flat panel detectors.

Dynamic flat panel image receptors are designed to capture high-quality images with greater speed and resolution, which is essential for procedures that rely on real-time imaging. To achieve this, it is important to generate a sufficient amount of x-ray photons, which is accomplished by increasing the x-ray tube current. A higher tube current means that more electrons are emitted from the cathode per unit of time, resulting in an increased x-ray output.

This increase is vital to maintain adequate image quality, especially in dynamic scenarios where rapid frame rates and high contrast are needed for accurate diagnosis or treatment. The image receptor's efficiency at lower doses does not negate the need for increased current to achieve optimal imaging performance under various clinical conditions.

The other options suggest adjusting the tube potential or capacity, which are considerations relevant to different types of imaging systems, but do not directly address the need for increased current specifically linked to the operational functionality of flat panel detectors in fluoroscopy.