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What is the goal of CT simulation QA
to ensure safe and accurate operation of the CT simulation process
Geometrical and Spatial integrity (accurate positioning and alignment)
QA check
CT number accuracy (HU callibration)
QA check
target and critical structure localization accuracy
QA check
example of radiation and patient safety QC check
safety interlocks and emergency off switches and CT dosimetry
example of electromechanical QC check
X-ray Generator Parameters and Couch & Laser Alignment
example of Image quality assurance check
Resolution and contrast assessment
how often is the CT simulation tube warmed up
daily QA (prior to QC test)
how often do we check the gantry laser alignment
daily QA
CT tabletop orientation is checked
monthly
table motion accuracy is checked
montly
laser alignment is checked
monthly
this is done to verify that the CT scanner tabletop is level and orthogonal to the imaging plane
CT tabletop orientation
what is the tolerance for CT tabletop orientation
±2mm
this is done to check the vertical and longitudinal movement verification
table motion accuracy
what is the tolerance for table motion accuracty
±1mm
what is done to check the orientation of gantry, wall, and ceiling lasers with the imaging plane and verify lateral wall lasers align with gantry lasers and scan plane
laser alignment
what is the tolerance for all laser alignment checks
±2mm
what is the tolerance for table indexing and position accuracy
±1mm
this is done to ensure tilt indicators return to the nominal position
gantry tilt verification
what is the tolerance for gantry tilt verification
±1 degree or ±1mm from nominal vertical position
the scan volume and scan location must be within _____ tolerance for scan localization accuracy
1mm
the gantry laser alignment check should align with what
the center of the imaging plane
