Noise and Scanning Parameters

Tube current

Scan time

Slice width

Noise (SD)

Eg. 100 mA 200 mA

or 5 mm or 10 mm

SD = x 0.7

• double mA or slice width:
  • reduce noise by sqrt 2 i.e. 1/?2 = 1 /1.4 = 0.7

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