Modules / Monthly QA (TG-142)

Monthly QA (TG-142)

Full TG-142 / MPPG 8.b monthly QA checklist with tolerance grading and a printable report.

Record each test result below. For measured tests, enter the deviation from the expected value — a result passes when its absolute deviation is within the tolerance shown. Tolerances are pre-filled with the selected machine class default and may be edited per test.

Monthly QA — header

Machine / linac name

QA date

Performed by

Machine class — sets default tolerances

Energies / notes (optional)

Dosimetry

Test	Tolerance	Result
X-ray output constancy (all photon energies) — TG-142 Table II	± %	%
Electron output constancy (all electron energies) — TG-142 Table II	± %	%
Backup monitor chamber constancy — TG-142 Table II	± %	%
Output constancy vs dose rate (at IMRT / stereo dose rate) — TG-142 Table II	± %	%
Photon beam profile (flatness / symmetry) constancy — TG-142 Table II	± %	%
Electron beam profile (flatness / symmetry) constancy — TG-142 Table II	± %	%
Electron beam energy constancy (2% or 2 mm R50 shift) — TG-142 Table II	± %	%

Mechanical

Test	Tolerance	Result
Light / radiation field coincidence, symmetric (2 mm or 1% / side) — TG-142 Table II	± mm	mm
Light / radiation field coincidence, asymmetric jaws — TG-142 Table II	± mm	mm
Distance check device for lasers vs front pointer — TG-142 Table II	± mm	mm
Gantry / collimator angle indicators (cardinal angles) — TG-142 Table II	± deg	deg
Accessory trays (e.g. port-film graticle tray) position — TG-142 Table II	± mm	mm
Jaw position indicators (symmetric) — TG-142 Table II	± mm	mm
Jaw position indicators (asymmetric, set at 0.0 / 10.0) — TG-142 Table II	± mm	mm
Cross-hair centering (walkout) — TG-142 Table II	± mm	mm
Treatment couch position indicators, lat/long/rot (2 mm / 1 deg; 1 mm / 0.5 deg SRS) — TG-142 Table II	± mm	mm
Wedge placement accuracy — TG-142 Table II	± mm	mm
Compensator placement accuracy — TG-142 Table II	± mm	mm
Latching of wedges / blocking tray — TG-142 Table II	Pass / Action / Fail
Localizing lasers (+/-2 mm non-IMRT, +/-1 mm IMRT, <+/-1 mm SRS) — TG-142 Table II	± mm	mm
Radiation isocentricity over clinical range (SRS/SBRT machines) — MPPG 9.a Table 1	± mm	mm

MLC

Test	Tolerance	Result
MLC leaf travel speed -- loss of leaf speed (IMRT) — TG-142 Table V	± cm/s	cm/s
MLC leaf-position accuracy, IMRT field at four cardinal angles — TG-142 Table V	± mm	mm

Safety

Test	Tolerance	Result
Laser guard / interlock test — TG-142 Table II	Pass / Action / Fail

Imaging

Test	Tolerance	Result
Planar MV (EPID) imaging vs treatment isocenter, four cardinal angles — TG-142 Table VI	± mm	mm
Planar MV (EPID) imaging scaling — TG-142 Table VI	± mm	mm
MV (EPID) image quality vs baseline (resolution, contrast, uniformity & noise) — TG-142 Table VI	Pass / Action / Fail
Planar kV imaging vs treatment isocenter, four cardinal angles — TG-142 Table VI	± mm	mm
Planar kV imaging scaling — TG-142 Table VI	± mm	mm
kV image quality vs baseline (resolution, contrast, uniformity & noise) — TG-142 Table VI	Pass / Action / Fail
Cone-beam CT geometric distortion — TG-142 Table VI	± mm	mm
Cone-beam CT image quality vs baseline (resolution, contrast, HU constancy, uniformity & noise) — TG-142 Table VI	Pass / Action / Fail

Cancel

Clinical disclaimer. The default tolerances shown are TG-142 / MPPG 8.b / MPPG 9 starting points only. They must be reviewed, set, and approved by a Qualified Medical Physicist for your institution before clinical use. Radiant QuikQA is a QA aid, not a vendor-validated QA product. All results must be independently verified.