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Medical Physics: Radiotherapy > Radiotherapy QA > Flashcards

Radiotherapy QA Flashcards

1
Q

What are the mechanical uncertainties that come from a Linac?

A
  • Jaw calibration
  • Light-field coincidence
  • Laser alignment
  • Collimator rotation
  • Gantry rotation and sag
  • Table movements (3-axes and rotation)
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2
Q

What is the suspend tolerance for a Linac LASER?

A

+/- 2mm

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3
Q

What is the suspend tolerance for Gantry Rotation?

A

+/- 0.5deg

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4
Q

What is the suspend tolerance for collimator rotation?

A

+/- 0.5deg

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5
Q

What is the suspend tolerance for couch movements?

A

+/- 2mm

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6
Q

What is the suspend tolerance for couch rotation?

A

+/- 0.5deg

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7
Q

What is the suspend tolerance for radiation field size (jaw calibration)?

A

+/- 2mm (field size at isocentre)

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8
Q

What is the suspend tolerance for light field size?

A

+/- 2mm (field size at isocentre)

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9
Q

What are the dosimetric uncertainties that come from a Linac?

A
  • Radiation output
  • Beam energy
  • Beam flatness and symmetry
  • Dose delivery stability
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10
Q

What is the suspend tolerance for radiation output (absorbded dose to water per MU)?

A

+/- 3%

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11
Q

What is the suspend tolerance for beam energy (TPR-20/10)?

A

+/- 1.5%

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12
Q

What is the suspend tolerance for Beam flatness and symmetry?

A

+/- 3% basline profiles

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13
Q

What is the suspend tolerance for Dose delivery stability (radiation output with gantry rotation)?

A

+/- 2.5%

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14
Q

What is the suspend tolerance for Dose delivery stability (Radiation output with MUs)?

A

+/- 2%

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15
Q

What checks are likely to be part of daily QA?

A
  • Output constancy
  • Absolute dose (weekly)
  • Safety interlocks
  • LASER alignment
  • Light-field and crosswire set-up
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16
Q

What checks are likely to be part of monthly QA?

A

Photons

  • Output
  • Energy
  • Flatness and symmetry

Electrons

  • Output
  • Energy
  • Applicator Output factors
  • Flatness and symmetry

Mechanicals

  • Cross-wire set up
  • Light field set-up
  • LASER alignment
  • Jaw calibration
  • Couch movements

Medical Physics: Radiotherapy (7 decks)

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