38. CT: QUALITY ASSURANCE Flashcards

1
Q
  1. 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
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2
Q
  1. How often do CA technologists perform Quality Assurance activities?
A

THEY CAN PERFORM THEM:
- daily
- weekly
- monthly

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3
Q
  1. How often do Qualified Medical Physicists perform Quality Assurance activities?
A
  • Annually
  • annually
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4
Q
  1. What is the Chief Physicist responsible for?
A
  • the entire Quality Assurance program
  • Remediation actions
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5
Q
  1. Who offers the general Quality Assurance Guidelines?
A
  • national organisations
  • international organisations
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6
Q
  1. What has the American College of Radiology set up?
A
  • they have set up the accreditation program for CT
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7
Q
  1. 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

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8
Q
  1. What happens if only the CT device, but not the entire facility, are accredited?
A
  • re-accreditation is required
  • every three years
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9
Q
  1. What are the three general categories that the Quality Assurance Tests deal with?
A
  1. Sample Clinical Images
  2. Measurements on a highly Specialised ARC CT
    Phantom
  3. Dose Assessments with the CTDI phantom
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10
Q
  1. 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
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11
Q
  1. What does the Second Category of tests involve?
A
  • measurements on a specially designed ARC CT
    Phantom
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12
Q
  1. How many modules does the Phantom consist of?
A
  • four
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13
Q
  1. What does the Phantom and its four modules asses?
A
  1. THE AVERAGE HU VALUE FOR PURE WATER
    - for a range of machine operational settings
  2. THE LINEARITY OF THE CT NUMBERS
    - along with the attenuation coefficients of a number of
    materials
  3. IMAGE UNIFORMITY
    - Poisson noise throughout the field of view
  4. LOW-CONTRAST RESOLUTION
    - by way of a contrast-detail test device
  5. HIGH-CONTRAST RESOLUTION
    - down to 0.4 lp/mm
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14
Q
  1. What does the third category of tests call for?
A
  • CTDI measurements for three distinct protocols
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15
Q
  1. 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
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16
Q
  1. What is the criteria for the imaging of an adult abdomen protocol with the large CTDI phantom?
A
  • the CTDI vol has to be below 30 mGy
17
Q
  1. What is the criteria for the imaging of a paediatric head with a phantom with the site’s standard paediatric setting ?
A
  • the phantom must be below 40 mGy
18
Q
  1. What is the criteria for the imaging of a paediatric abdomen with a phantom with the site’s standard paediatric setting ?
A
  • it must be below 20 mGy
19
Q
  1. Does this image make sense?
A
  • yes
20
Q
  1. Does this image make sense?
A
  • yes