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1.2 Protocol Considerations
Before using Dose Check, the site physicist, and/or radiation safety officer in collaboration with
the radiologist, should understand the current dose levels of site scanning protocols and the
maximum dose limit at the site's clinical practice. Using this information, an appropriate starting
point for the Notification Value for each protocol and system Alert Value should be set.
Guidance from such bodies as the American College of Radiology (ACR), US Food and Drug
Administration (FDA), European Union (EU), International Commission on Radiological
Protection (ICRP) and American Association of Physicists in Medicine (AAPM) may be useful in
determining Notification and Alert values. The AAPM Working Group on Standardization of CT
Nomenclature and Protocols has published a list of reference Notification values based on
anatomical location. These can be found at www.aapm.org.
1.3 Terminology
1.3.1 Notification Value (NV)
The dose value that is the site's typical dose level for each scan group. NV value can be
checked by CTDI
sizes that will be imaged using the scan protocol. When setting the NV value, give consideration
to an appropriate upper limit to account for the percentage of exams that you would normally
expect the value to be exceeded. Scans that exceed NV values will be logged.
1.3.2 Alert Value (AV)
The dose value in which specific authorization is needed to continue with a scan that exceeds
this value. AV value can be checked by CTDI
1.3.3 Dose Check Administrator
A user role with authorization to enable NV and AV checking.
1.3.4 Dose Check AV Exceeding User
A user role with authorization to exceed AV values during scanning.
1.3.5 Protocol Change Control
Requires user authorization to modify and save protocol parameters.
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, DLP or both. This value should be set to an average value of all patient
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Direction 5480385-1EN, Revision 1
, DLP or both.
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Revolution CT User Manual
1 Overview
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Troubleshooting
