(1)
University of Wisconsin Hospital and Clinics, Madison, WI, USA
(2)
University of Wisconsin-LaCrosse, LaCrosse, WI, USA
Keywords
Beam flatnessBeam symmetryDigital readoutDoor interlockIonization chamberLight field/radiation field coincidenceOptical distance indicatorOutput constancyRotation around isocenterSplit beam testQuestions
1.
Ionization chambers used for the quality assurance of treatment machines should be calibrated at an Accredited Dosimetry Calibration Lab (ADCL) every ________.
A.
6 months
B.
1 year
C.
2 years
D.
5 years
2.
The radiation therapy treatment chart should be checked, at minimum, on a _____ basis.
A.
Daily
B.
Weekly
C.
Monthly
D.
Annual
3.
Which organization provides guidelines for facilities to follow in regards to Linear Accelerator Quality Assurance ?
A.
American Society of Radiologic Technologists
B.
American Society of Radiation Oncologists
C.
American Registry of Radiologic Technologists
D.
American Association of Physicists in Medicine
4.
Why are some linear accelerator quality assurance tests completed less often than others?
A.
They are unlikely to change over time
B.
Impact of malfunction is low
C.
A and B
D.
All tests are performed on a monthly basis
5.
A ___________ test is used to check multiple beam alignment.
A.
Split beam
B.
Collimator digital readout
C.
Cross-hair centering
D.
Gantry
6.
On the linear accelerator, the door interlock should be tested:
A.
Daily
B.
Weekly
C.
Monthly
D.
Annually
7.
Daily photon output constancy on the linear accelerator should be within ____% of normal limits.
A.
1
B.
2
C.
3
D.
4
8.
The optical distance indicator can be measured using this tool:
A.
Localizing lasers
B.
Lutz device
C.
Mechanical distance front pointer
D.
Laser cube
9.
Which of the following is the correct formula to correct for temperature and pressure changes, which would affect ionization readings ?
A.
Correction t, p Factor = (760/P) × [(273 + T)/295]
B.
Correction t, p Factor = (760/P)/[(273 + T)/295]
C.
Correction t, p Factor = (P/760) × [295/(273 + T)]
D.
Correction t, p Factor = (P/760)/[295/(273 + T)]
10.
Beam flatness is measured over ____ of field width, specified at 10 cm depth.
A.
50 %
B.
60 %
C.
70 %
D.
80 %
11.
What test is completed by measuring and comparing multiple points of a beam profile equidistance from the central axis?
A.
Beam flatness
B.
Beam symmetry
C.
Radiation/light field coincidence
D.
Output constancy
12.
What is the tolerance for the monthly light field/radiation field coincidence test ? (Choose all correct answers).
A.
1 mm
B.
2 mm
C.
1 %
D.
2 %
13.
Gantry and collimator angle indicators are checked:
A.
Daily
B.
Weekly
C.
Monthly
D.
Annual
14.
Tolerance of the cross-hair centering is:
A.
1 mm
B.
1 %
C.
2 mm
D.
2 %
15.
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Collimator , gantry , and couch rotation around the isocenter are tested on a ____ basis.
A.
Daily
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