38. CT: QUALITY ASSURANCE Flashcards
1
Q
- What do CT vendors often provide?
A
- they provide a handbook of recommended
Quality Assurance (QA) activities - they also carry out routine preventative maintenance
- this is only if they are under contract
2
Q
- How often do CA technologists perform Quality Assurance activities?
A
THEY CAN PERFORM THEM:
- daily
- weekly
- monthly
3
Q
- How often do Qualified Medical Physicists perform Quality Assurance activities?
A
- Annually
- annually
4
Q
- What is the Chief Physicist responsible for?
A
- the entire Quality Assurance program
- Remediation actions
5
Q
- Who offers the general Quality Assurance Guidelines?
A
- national organisations
- international organisations
6
Q
- What has the American College of Radiology set up?
A
- they have set up the accreditation program for CT
7
Q
- What does the Accreditation Program foe CT invole?
A
IT INVOLVES THE EVALUATION OF:
- the individual CT as a facility
- all the interpreting physicians
- medical physicists
- technologists
- all those who work on the CT
8
Q
- What happens if only the CT device, but not the entire facility, are accredited?
A
- re-accreditation is required
- every three years
9
Q
- What are the three general categories that the Quality Assurance Tests deal with?
A
- Sample Clinical Images
- Measurements on a highly Specialised ARC CT
Phantom - Dose Assessments with the CTDI phantom
10
Q
- What needs to be submitted in order to do these 3 tests?
A
- the submission of a set of clinical images
of various types - details of the protocols that are used routinely at the
facility
11
Q
- What does the Second Category of tests involve?
A
- measurements on a specially designed ARC CT
Phantom
12
Q
- How many modules does the Phantom consist of?
A
- four
13
Q
- What does the Phantom and its four modules asses?
A
- THE AVERAGE HU VALUE FOR PURE WATER
- for a range of machine operational settings - THE LINEARITY OF THE CT NUMBERS
- along with the attenuation coefficients of a number of
materials - IMAGE UNIFORMITY
- Poisson noise throughout the field of view - LOW-CONTRAST RESOLUTION
- by way of a contrast-detail test device - HIGH-CONTRAST RESOLUTION
- down to 0.4 lp/mm
14
Q
- What does the third category of tests call for?
A
- CTDI measurements for three distinct protocols
15
Q
- What is the criteria for the imaging of an adult head with the small CTDI phantom?
A
- the adult head should yield a reading that is below the
pass or fail criteria of 80 mGy