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Dose Tolerances > LINAC Tolerances > Flashcards

LINAC Tolerances Flashcards

1
Q

Daily

X-ray output consistency (all energies)

A

3%

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2
Q

Daily

Laser localization - 3D

A

2mm

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3
Q

Daily

Laser localization - IMRT

A

1.5mm

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4
Q

Daily

Laser localization - SRS/SBRT

A

1mm

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5
Q

Daily

ODI at Iso - 3D

A

2mm

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6
Q

Daily

ODI at Iso - IMRT

A

2mm

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7
Q

Daily

ODI at Iso - SRS/SBRT

A

2mm

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8
Q

Daily

Collimator size - 3D

A

2mm

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9
Q

Daily

Collimator size - IMRT

A

2mm

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10
Q

Daily

Collimator size - SRS/SBRT

A

1mm

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11
Q

Daily

Door Interlock

A

Functional

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12
Q

Daily

Door closing safety

A

Functional

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13
Q

Daily

Audio/Visual

A

Functional

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14
Q

Daily

Radiation area monitor

A

Functional

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15
Q

Daily

Beam On indicator

A

Functional

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16
Q

Monthly

X-ray output

A

2%

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17
Q

Monthly

Typical dose rate output accuracy - IMRT and SRS/SBRT

A

2% at dose rate

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18
Q

Monthly

Photon bean profile constancy

A

1%

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19
Q

Monthly

Electron bean profile constancy

A

1%

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20
Q

Monthly

Electron bean energy constancy

A

2% / 2mm

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21
Q

Monthly

Light/radiation field

A

2mm or 1% on each side

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22
Q

Monthly

Light/radiation field - asymmetric

A

1mm or 1% on each side

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23
Q

Monthly

Gantry/collimator indicators

A

1 degree

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24
Q

Monthly

Accessory trays

A

2mm

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25
Q

Monthly

Jaw position indicators - symmetric

A

2mm

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26
Q

Monthly

Jaw position indicators - asymmetric

A

1mm

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27
Q

Monthly

Cross hair centering

A

1mm

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28
Q

Monthly

Tx couch positioning - 3D & IMRT

A

2mm / 1 degree

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29
Q

Monthly

Tx couch positioning - SRS/SBRT

A

1mm / 0.5 degree

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30
Q

Monthly

Wedge placement accuracy

A

2mm

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31
Q

Monthly

Compensator placement accuracy

A

1mm

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32
Q

Monthly

Latching of wedges & blocking tray

A

Functional

33
Q

Monthly

Localization lasers - 3D

A

+- 2mm

34
Q

Monthly

Localization lasers -IMRT

A

+- 1mm

35
Q

Monthly

Localization lasers - SRS/SBRT

A

< +- 1mm

36
Q

Monthly

Beam output constancy

A

2%

37
Q

Monthly

Phase, amplitude beam control

A

Functional

38
Q

Monthly

In-room respiratory monitoring system

A

Functional

39
Q

Monthly

Gating Interlock

A

Functional

40
Q

CT Simulator tolerances
Daily
CT Number accuracy

A

CT Number for water - 0 +- 5 HU

41
Q

CT Simulator tolerances
Monthly:
CT Number accuracy

A

4 to 5 different materials - 0 +- 5HU

42
Q

CT Simulator tolerances
Annually
CT Number accuracy

A

Electron density phantom - 0 +- 5 HU

43
Q

Profile Tolerance

A

1% from Baseline

44
Q

Calibration TG-51 Tolerance

A

1%

45
Q

MLC Picket Fence Test Tolerance

A

Weekly

46
Q

MLC Step/Shoot & Sliding Window

A

Annual

47
Q

PDD/TMR Tolerance

A

1%

48
Q

IGRT (KVCT and MVCT) iso check

A

Daily

49
Q

IGRT (KVCT and MVCT) iso check tolerance

A

Daily:

2mm / 1mm (SRS)

50
Q

Dynamic Wedge Output

A

Monthly

51
Q

Profile Tolerance

A

1% from Baseline

52
Q

Calibration TG-51 Tolerance

A

1%

53
Q

MLC Picket Fence Test Tolerance

A

Weekly

54
Q

MLC Step/Shoot & Sliding Window

A

Annual

55
Q

PDD/TMR Tolerance

A

1%

56
Q

IGRT (KVCT and MVCT) iso check

A

Daily

57
Q

IGRT (KVCT and MVCT) iso check tolerance

A

2mm / 1mm (SRS)

58
Q

Dynamic Wedge Output

A

Monthly

59
Q

Annual:

Temporal accuracy of phase/amplitude gating

A

100ms of expected

60
Q

Annual Calibration of surrogate for respiratory phase/amplitude

A

100ms of expected

61
Q

Annual

Gating Interlock testing

A

Functional

62
Q

Annual

X-ray flatness change from baseline

A

1%

63
Q

Annual

X-ray symmetry change from baseline

A

+- 1%

64
Q

Annual

Electron flatness change from baseline

A

1%

65
Q

Annual:

Electron symmetry change from baseline

A

+- 1%

66
Q

SRS arc rotation mode (range: .5-1.0 MU/deg)

A

MU set vs. delivered: 1MU or 2% (whichever is greater)

Gantry arc set vs. delivered: 1 degree or 2% (whichever is greater)

67
Q

Annual

Calibration TG-51

A

1% Annual

68
Q

Annual

Output Factors for Small Fields

A

< 2%

69
Q

Annual

PDD/TMR

A

1%

70
Q

Annual

TBI PDD X-ray

A

1%

71
Q

Annual

TSET: electron PDD

A

1mm

72
Q

Annual

TBI/TSET Output

A

2%

73
Q

LINAC Wedge Tests

A

Daily: Functional
Monthly: Output
Annual: Profile

74
Q

LINAC MLC Tests - Weekly

A

Picket Fence - visual inspection

75
Q

LINAC MLC Tests - Monthly

A

Leaf Position Accuracy - 1mm for leaf positions of IMRT field for 4 cardinal gantry angles;

Travel speed - loss of leaf speed > 0.5 cm/s;

Leaf Setting vs Radiation Field - 2mm

76
Q

LINAC MLC Tests - Weekly

A

Transmission - 0.5% from baseline;

Leaf Position Repeatability - +- 1mm;

MLC Spoke shot - < 1mm radius;

Rad-Light Coincidence - +-2mm;

Step & Shoot test - <0.35cm max error RMS, 95% of error counts<0.35 cm;

Moving Window test - <0.35cm max error RMS, 95% of error counts<0.35 cm

77
Q

LINAC Annual Calibration - TG-51:

A
  1. Frequency - Annual
  2. Specified - In Water
  3. Calibration Factor - NDw
  4. Photons - Ion Chamber
  5. Photon Measurement depth - 10cm
    6 .Photon Calibration depth - Dmax
  6. Electrons - Parallel Plate Ion Chamber
  7. e’ Measurement depth - d reference
  8. e’ Calibration depth - Dmax
  9. Photon measurements use Pb foil - remove e’ contamination
78
Q

How often are Ion chambers calibrated?

A

every 2 years

Dose Tolerances (23 decks)

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