Table V -.

Noise and dose reference levels by scanner model

CT Scanner Model	Noise Reference Level (HU)¥	Noise Reference range (HU)¥	Dose Ref Level (mGy)*	Dose Reference range (mGy)*
All scanner models	11.25	10.25 – 12.25	26.7	19.6 – 37.0
GE Discovery750/Revolution HD	11.25	10.25 – 12.25	29.0	21.5 – 40.6
Siemens SOMATOM Force	10.25	9.75 – 11.25	23.0	16.2 – 37.7
Siemens SOMATOM Definition Flash	11.75	10.75 – 12.75	22.1	16.5 – 28.1
Siemens SOMATOM Edge Plus	10.25	9.25 – 10.75	26.5	20.9 – 35.0
GE Revolution CT	10.25	9.75 – 11.25	23.1	19.8 – 30.7

^*Dose reference levels refer to the 50^th percentile of dose data (Range, 25^th-75^th percentile)

^¥Noise reference levels refer to the 50^th percentile of noise data (Range, 25^th-75^th percentile)