CTDI
Also written as: CTDI — CT Dose Index
CT Dose Index; a standardized measure of radiation dose output from CT scanners used to monitor patient radiation exposure.
Full Definition
CT Dose Index (CTDI) is a standardized metric that quantifies the radiation dose delivered by CT scanners, typically measured in milligrays (mGy). It serves as a fundamental parameter for radiation dose monitoring and optimization in diagnostic imaging. CTDI is measured using standard phantoms and provides a reference point for comparing dose levels across different CT protocols and scanners. In oncologic radiology, CTDI values are particularly important when performing serial imaging for treatment monitoring, as cumulative radiation exposure must be carefully tracked and justified.
Usage
Usage note: Always include units (mGy) when reporting CTDI values.
In Context
- "The CTDI for this oncologic staging protocol should not exceed 15 mGy per acquisition." — Radiation dose report
- "Monitor cumulative CTDI values for patients undergoing serial CT surveillance." — Quality assurance guideline