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Dosimetry > linac/sim QA > Flashcards

linac/sim QA Flashcards

(59 cards)

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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

25
mlc picket fence test detects
leaf positions out of calibration
26
check sums is qa for testing the integrity of
computer files
27
IMRT primary barrier shielding vs non-IMRT
unchanged
28
IMRT leakage barrier shielding increased by ? HVL
2-3
29
IMRT maze door barrier shielding increased by ? HVL
2-3
30
UT- linac jaws transmission tolerance
1%
31
UT mlc transmission interleaf tolerance
2%
32
UT- cerrobend block transmission tolerance
3-5%
33
UT- linac calibration protocol for dosimetry
TG 21 old; TG 51 new
34
UT- rad measurement equip calibration frequency
every 2 yrs
35
UT- mechanical tolerance
2 mm
36
UT- rad/light coincidence tolerance
2mm
37
QA split field technique used for
beam misalignment
38
CDC is a gov't agency involved in
helping hospital infection control
39
intermediate billing # ports
3 or more converging ports
40
complex billing # tx areas
3+ tx areas
41
split field requires longitudinal displacement of collimator for jaw symmetry rotated ?
180 deg
42
machinist dial indicator for qa used for
jaw symmetry
43
when detector receives more radiation than capable
point of saturation
44
calibration ensures radiation detectors able to
record values close to actual reading
45
acceptable tolerance for field flatness
+/- 3%
46
indicators for sim checked how frequently
monthly
47
cross hair for sim checked how frequently
monthly
48
collision for sim checked how frequently
monthly
49
coincidence for sim checked how frequently
monthly
50
focal spot for sim checked how frequently
monthly
51
film processor for sim checked how frequently
monthly
52
sagittal for sim checked how frequently
annually
53
vert for sim checked how frequently
annually
54
travel couch for sim checked how frequently
annually
55
UT xray flatness tolerance
3% of central 80% of field @ 10 cm
56
UT x-ray & e- symmetry tolerance
2% of central 80% of field @ 10cm
57
UT mlc transmission intraleaf tolerance
4%
58
UT- linac calibration protocol for mechanical
TG-40
59
split field technique checks what
opposite field radiation/light incongruence (mirror misalignment)

Dosimetry (53 decks)

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