Table 1 Definition of the parameters of CT perfusion
Abbreviations | Variable | Description | Standard unit |
|---|---|---|---|
BF | Blood flow | the blood volume flowing across the given volume of tissue per minute | ml/(100 mL·min) |
BV | Blood volume | the total blood volume flowing across the given volume of tissue | ml/100 ml |
MTT | Mean transit time | the mean time taken for blood to flow from the artery to the vein | s |
TTS | Time to start | the time to the start of enhancement in a given region | s |
TTD | Time to drain | the time from the maximum enhancement to the end of enhancement in a given region | s |
Tmax | Time to maximum | the time from the start to the maximal enhancement in a given region | s |
FE | Flow extraction product | the blood volume from the intravascular to the extravascular space flowing across the given volume of tissue per minute | ml/(100 mL·min) |