Unit 7 - QC and Artifacts in CT

Question 1

What is the purpose of QC testing in CT?

Answer 1

To ensure scanner produces high quality images, at lowest possible dose to both patients and staff.

Question 2

What are the 3 types of QC testing in CT?

Answer 2

1. Acceptance Testing
2. Routine Performance Testing
3. Error Correction Testing

Question 3

Who preforms Acceptance Testing in CT?

Answer 3

Performed by independent 3rd party

Question 4

What is the purpose of Acceptance Testing in CT?

Answer 4

Establishing that scanner meets the vendor’s specifications

Question 5

How often is Routine Performance Testing preformed?

Answer 5

Performed on a peroidic basis

Question 6

What is the purpose of Routine Performance Testing?

Answer 6

Monitors the technical components of the scanner (Focuses on image quality parameters and dose) and examines whether the scanner meets acceptance limits

Question 7

What is the purpose of Error Correction Testing?

Answer 7

Test to evaluate correction of equipment that has malfunctioned.

Question 8

What 3 indications/values should be located on the gantry?

Answer 8

1. Table Height Indicator
2. Table Position Indicator
3. Angulation Indicator Functioning

Question 9

Read over the following requirements of the visual checklist in CT:

Answer 9

1. Laser localization functioning (laser lights in gantry)
2. High voltage cables (not frayed)
3. Acceptable smoothness of table motion
4. X-ray ON indicator
5. Exposure Switch functioning
6. Display WW/WL (on monitor)
7. Control Panel lights working
8. Warning labels present: Intercom system functioning (used to communicate instructions to patient from the control room)
9. CT machine service records present

Question 10

What are the names of the 2 types of Phantoms used for QC Testing in CT?

Answer 10

1. ACR (American College of Radiology) CT accreditation phantom aka Gammex 464 phantom
2. Catphan 700 phantom

Vendor specific