Radiation-Emitting Products

Where in the x-ray field should focal spot size be measured?

Policy Guidance Help System logo

Under the regulations, the FDA has provided flexibility to facilities to use procedures that best enable them to meet the requirements. Facilities should be aware that the focal spot size measurement can vary depending on where it is measured in the x-ray field. Therefore, facilities should follow the manufacturer’s recommendation or physicist’s judgment or any appropriate QC manual for the appropriate procedure.

Back to Focal Spot Condition/System Resolution – Annual Quality Control Test

Page Last Updated: 08/13/2014
Note: If you need help accessing information in different file formats, see Instructions for Downloading Viewers and Players.