The Center typically does the daily quality assurance (QA) test on a phantom to ensure the scanner works as expected. Here is a page of plot over time, showing a variety of QA metrics.
If you like to check the metrics numerically, or you like to include some metrics as a regressor in your analysis, you can download the CSV file.
To view details about the QA metrics and testing procedure, visit https://go.osu.edu/ccbbi-qa-metrics-and-testing-procedure