QED Shape Coil Operator's Manual page 29

(12) Calculate the SNR using the formula below.
SNR calculation
Signal
SNR =
Noise
* Noise value (SD) is average of two Noise ROIs SD values.
(13) Obtain the SNR for the acquired images and confirm the measurement SNR is pass or fail
the specification for section 1.
Specification for section 1
SNR  160
(14) Perform SNR measurement for section 2 and subsequent sections. The couchtop position
for measurement and the required SNR for each section are specified in the table below.
Repeat steps (4) to (12) for each section.
Section 2:
Section 3:
Section 4:
29 | P a g e
value (mean)
value (SD)
Couchtop position
indicator on the
operating panel
55
-55
-200
SNR
specification
160
160
160
6000921 Rev. 1