As an imaging engineer you have dutifully created a site-specific backup disk that includes calibration data. (This should be done frequently. It only takes about 10 minutes or less to do and backs up exam plan protocols, tube alignment data, filament current (i/F) data, etc.)
This calibration data backed up on the site-specific disk is not the actual calibration data itself, which is stored in the RDD or Raw Data Disk array. That is a common misunderstanding.
Rather what you have backed up on the site-specific disk is the management file for the calibration data. This management file is stored on the Scan Side Image Disk Partition E: This is an important distinction. When the time comes to replace a parity disk or more than one data disk in the RDD it means that all NRA (Noise Reduction Algorithm) or water calibration data will be lost. Simply restoring the calibration file from the site specific disk will not be enough to restore proper operation.
Backing up the actual NRA water calibration data* that is stored on the RDD should be done anytime new data is acquired and only takes a few minutes. This calibration data can be stored on the Image Drive on Scan Side Partition E:
How to backup NRA water Calibration Data to drive E:
The NRA water calibration data will be saved in the CALIB directory on the [E:/] drive. This takes approximately 10 minutes. Much faster than discovering after the fact that you have lost all calibration data!
To restore NRA water calibration data to the RDD after servicing the RDD by replacing disk(s) the commands are similar.
The NRA water calibration data will be restored to the RDD in about 10 minutes.
This would be considered a best practice to speed up any downtime during servicing the RDD.
*Please note that this does not back up air calibrations. Air calibrations still have to be acquired after replacing the parity disk or more than one data disk in the RDD.
This is only one small way we can help service provides save costs and increase uptime.
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