[4] Quality Assurance (QA) for CT Scan

Which one is NOT the objective of performing quality assurance (QA) in CT Scan system?

• Produce good image quality

• Prevent unnecessary radiation dose to patient

• Check for image artifact or machine mulfunction

• To regulate the timetable for CT technologist

The American College of Radiology (ACR) CT accreditation QA phantom has _____ modules

• 4

• 5

• 6

• 7

Which of the following cross section of ACR CT phantom used to check for "low contrast resolution"?

• 
• 
• 
• 

Which of the following cross section of ACR CT phantom used to check for "CT number uniformity, noise & distance accuracy"?

• 
• 
• 
• 

The laser light accuracy in a CT scan machine must be within ______

• 1 mm

• 2 mm

• 3 mm

• 5 mm

A radiographer performed a slice thickness (ST) accuracy check for ST = 10 mm. The tolerance accepted value is ___________

• 0.5 mm

• 1 mm

• 1.5 mm

• 2 mm

Low contrast resolution & high contrast resolution in CT scan system must be check _______

• weekly

• monthly

• semi-annually (every 6 months)

• annually (every 1 year)

Which of the following CT image quality QA must be checked every week by CT radiographer?

• High contrast resolution

• Low contrast resolution

• Linearity

• CT number uniformity & noise

This is a CT scan image of ACR phantom to evaluate _________

• Low contrast resolution

• High contrast resolution

• CT number uniformity

• Noise

CT number uniformity acceptance value must be within ______ Hounsfield unit (HU)

• 0.5

• 2

• 5

• 10