Radiant Medical Physics QuikQA Radiant Medical Physics Consulting
Public evaluation instance. For testing with non-clinical sample data only — do not upload PHI or real patient data. Analysis output is unvalidated and not for clinical use.
Modules / Monthly QA

Monthly QA

Monthly linac QA checklist combining TG-142, TG-179, MPPG 2.b, MPPG 8.b and MPPG 9.b 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
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 (<=2% per MPPG 8.b) — TG-142 Table II; MPPG 8.b ± % %
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; 0.5 deg per MPPG 8.b) — TG-142 Table II; MPPG 8.b ± 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.b ± 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 (0.5 mm per MPPG 8.b) — TG-142 Table V; MPPG 8.b ± mm mm
Safety
Test Tolerance Result
Laser guard / interlock test — TG-142 Table II Pass / Action / Fail
Door closing safety (extended functional check) — MPPG 8.b Pass / Action / Fail
Collision-avoidance / proximity interlocks (gantry, couch, imager arms) — MPPG 8.b; TG-198 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
CBCT HU constancy (water-equivalent insert vs baseline) — TG-179; MPPG 2.b ± HU HU
CBCT low-contrast resolution vs baseline (Catphan CTP515 or equivalent) — TG-179; MPPG 2.b Pass / Action / Fail
CBCT spatial / high-contrast resolution vs baseline (line-pair / MTF) — TG-179; MPPG 2.b Pass / Action / Fail
CBCT uniformity (center vs periphery, HU range) — TG-179; MPPG 2.b ± HU HU
kV / MV / CBCT image-registration accuracy (known offset phantom) — MPPG 2.b ± mm mm
Surface-guidance (SGRT) static-pose accuracy vs treatment iso (if installed) — MPPG 2.b ± mm mm
Cancel
Clinical disclaimer. The default tolerances shown are TG-142, TG-198, TG-179, MPPG 2.b, MPPG 8.b and MPPG 9.b 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.