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Dosimetry > linac/sim QA > Flashcards

linac/sim QA Flashcards

1
Q

daily x-ray & e- output constancy frequency, tolerance

A

3%

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2
Q

monthly linac output tolerance

A

+/- 2%

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3
Q

Gantry indicator frequency, tolerance

A

Monthly 1 deg

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4
Q

Collimator indicator frequency, tolerance

A

Monthly 1 deg

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5
Q

Light intensity frequency

A

Monthly

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6
Q

Radiation light congruence frequency

A

Monthly

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7
Q

Field light dependence frequency

A

Annual

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8
Q

Off axis ratio frequency

A

Annual

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9
Q

wedge, cone, tray frequency

A

Annual

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10
Q

Linearity frequency, tolerance

A

Annual 1%

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11
Q

Output vs angle frequency

A

Annual

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12
Q

ISO checks frequency

A

Annual

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13
Q

simulator gantry/coll indicator tolerance

A

1 deg

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13
Q

sim annual

A

isocenter, sag, vert, travel couch

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15
Q

ct sim gantry tilt tolerance

A

1 deg

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16
Q

ct sim scan localization tolerance

A

1mm

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17
Q

e- flatness tolerance, frequency

A

3% monthly

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17
Q

transmission

A

annual

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19
Q

transmission frequency

A

annual

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20
Q

PDD beam quality defined for photons at

A

10 cm

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20
Q

depth of calibration for photons

A

10cm

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21
Q

beam quality defined for e- at

A

R50

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23
Q

depth of calibration for e-

A

reference depth

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24
Q

beam flatness specified @ what depth

A

10 cm

25
Q

mlc picket fence test detects

A

leaf positions out of calibration

26
Q

check sums is qa for testing the integrity of

A

computer files

27
Q

IMRT primary barrier shielding vs non-IMRT

A

unchanged

28
Q

IMRT leakage barrier shielding increased by ? HVL

A

2-3

29
Q

IMRT maze door barrier shielding increased by ? HVL

A

2-3

30
Q

UT- linac jaws transmission tolerance

A

1%

31
Q

UT mlc transmission interleaf tolerance

A

2%

32
Q

UT- cerrobend block transmission tolerance

A

3-5%

33
Q

UT- linac calibration protocol for dosimetry

A

TG 21 old; TG 51 new

34
Q

UT- rad measurement equip calibration frequency

A

every 2 yrs

35
Q

UT- mechanical tolerance

A

2 mm

36
Q

UT- rad/light coincidence tolerance

A

2mm

37
Q

QA split field technique used for

A

beam misalignment

38
Q

CDC is a gov’t agency involved in

A

helping hospital infection control

39
Q

intermediate billing # ports

A

3 or more converging ports

40
Q

complex billing # tx areas

A

3+ tx areas

41
Q

split field requires longitudinal displacement of collimator for jaw symmetry rotated ?

A

180 deg

42
Q

machinist dial indicator for qa used for

A

jaw symmetry

43
Q

when detector receives more radiation than capable

A

point of saturation

44
Q

calibration ensures radiation detectors able to

A

record values close to actual reading

45
Q

acceptable tolerance for field flatness

A

+/- 3%

46
Q

indicators for sim checked how frequently

A

monthly

47
Q

cross hair for sim checked how frequently

A

monthly

48
Q

collision for sim checked how frequently

A

monthly

49
Q

coincidence for sim checked how frequently

A

monthly

50
Q

focal spot for sim checked how frequently

A

monthly

51
Q

film processor for sim checked how frequently

A

monthly

52
Q

sagittal for sim checked how frequently

A

annually

53
Q

vert for sim checked how frequently

A

annually

54
Q

travel couch for sim checked how frequently

A

annually

55
Q

UT xray flatness tolerance

A

3% of central 80% of field @ 10 cm

56
Q

UT x-ray & e- symmetry tolerance

A

2% of central 80% of field @ 10cm

57
Q

UT mlc transmission intraleaf tolerance

A

4%

58
Q

UT- linac calibration protocol for mechanical

A

TG-40

59
Q

split field technique checks what

A

opposite field radiation/light incongruence (mirror misalignment)

Dosimetry (53 decks)

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