SFS-2
It sounds like you're describing a set of test objects designed for regular and efficient assessments of imaging performance, with a specific focus on aspects prone to deterioration. The intention is to use these test objects for quick and easy checks, and maintaining a continuous record of the results. This ongoing record can help identify any trends indicating a decline in imaging performance over time, allowing for proactive measures to address and rectify potential issues. Regular monitoring and documentation of these numbers contribute to the overall quality assurance and maintenance of imaging systems. If you have specific questions or need further information, feel free to ask!