GE Revolution CT - Center the Patient Properly When Using Smartma; Increase the Pitch; Use Small SFOV Filters

Illustration 4: Maximum patient diameter guide for low kV selection (1) and Lateral Patient
Diameter in cm (2)
3.5.3 Center the patient properly when using SmartmA
Properly center the patient. This is critical with SmartmA.
•
Double check and verify the table height is centered to the patient.
•
Raise or lower the table as needed before taking the scouts.
•
After the scouts are taken and prescription is done, verify the mA table calculations before
confirming the scan.
•
Make sure minimum mA and maximum mA values are set appropriately.
•
See Set the mA procedure in the Scan chapter.
3.5.4 Increase the pitch
Increase the pitch.
•
Increasing the pitch decreases the amount of radiation needed to cover the region indicated,
usually without compromising the diagnostic quality of the scan.
•
Increasing pitch from 1.0 to 1.375:1 decreases dose by a factor of about 27%.
3.5.5 Use Small SFOV Filters
Use the smallest SFOV whenever possible, depending on the exam and size of the patient.
•
Matching the appropriate SFOV bowtie filter to the size of the patient ensures the dose is
delivered where it is needed, and filtered where it is not needed.
•
Small SFOV supports DFOVs up to 32 cm in diameter.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 5 Pediatrics and Small Patients 131