ABR Quality Assurance and Quality Control

Question 1

According to AAPM TG-142, what is the daily output constancy tolerance for a linear accelerator used for non-IMRT treatments?

Accepted Answer

±2%

Answer

±1%

Answer

±3%

Answer

±5%

Question 2

Which AAPM task group report provides the primary framework for absolute dose calibration of high-energy photon and electron beams in the United States?

Accepted Answer

TG-51

Answer

TG-142

Answer

TG-119

Answer

TG-218

Question 3

The Winston-Lutz test is primarily used to verify which parameter of a linear accelerator?

Accepted Answer

Isocenter coincidence of radiation and mechanical axes

Answer

Beam flatness and symmetry

Answer

MLC leaf transmission

Answer

Output linearity at low monitor units

Question 4

According to TG-142, what is the recommended tolerance for gantry angle accuracy on a linac?

Accepted Answer

0.5°

Answer

0.1°

Answer

1.0°

Answer

2.0°

Question 5

What is the standard source-to-surface distance (SSD) reference condition used for linac output calibration per TG-51?

Accepted Answer

100 cm SSD, 10×10 cm² field, 10 cm depth

Answer

80 cm SSD, 10×10 cm² field, dmax depth

Answer

100 cm SSD, 10×10 cm² field, dmax depth

Answer

100 cm SAD, 10×10 cm² field, 5 cm depth

Question 6

Which QA procedure is specifically designed to test the end-to-end accuracy of a stereotactic radiosurgery (SRS) system?

Accepted Answer

End-to-End (E2E) test

Answer

Winston-Lutz test

Answer

Gamma knife Leksell frame check

Answer

Output factor measurement

Question 7

According to TG-142, what is the recommended monthly tolerance for beam flatness (non-IMRT) on a linear accelerator?

Accepted Answer

±2%

Answer

±0.5%

Answer

±1%

Answer

±3%