Notification value
In CT
A facility-defined value for volume CT dose index (CTDIvol) or dose–length product (DLP) for a specific scan protocol. If the notification value will be exceeded with the settings chosen, a warning will be displayed on the CT console that prompts the operator to review the scan settings before proceeding with the examination, verify that they are correct or change them.
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from ICRP Publication 135, 2017
A component of the National Electrical Manufacturers Association Computed Tomography (CT) Dose Check Standard (XR 25) (NEMA 2010). CT scanners that are compliant with this standard will notify the operator prior to starting a scan whenever the estimated dose index is above a facility-defined value for volume CT dose index (CTDIvol) or dose–length product (DLP) for a specific scan protocol (i.e. either metric may be chosen by the facility). If the notification value is exceeded a warning is displayed on the operator’s console that prompts the radiographer to review the scan settings before proceeding with the examination and either verify that they are correct or change them.