What is the dose reduction percentage when using a 0.2-mm copper filter?

The use of a 0.2-mm copper filter in fluoroscopy is primarily aimed at reducing the dose of radiation to patients and staff during procedures. Copper filters are effective because they selectively absorb low-energy X-rays that contribute little to the diagnostic quality of the imaging but increase radiation exposure.

When a 0.2-mm copper filter is utilized, it has been shown to significantly reduce patient dose by approximately 50%. This is because such filters can efficiently remove the softer, less penetrating X-rays from the beam, which helps in lowering the overall dose delivered. This level of dose reduction not only enhances safety but also maintains the quality of the fluoroscopic images, as the higher energy X-rays that are more useful for imaging can still pass through.

The remaining options suggest lower or higher percentages that do not accurately reflect the significant impact of the 0.2-mm copper filter on radiation dose reduction during fluoroscopy procedures. A reduction of 50% strikes a balance between optimizing image quality and minimizing unnecessary radiation exposure.