IMBT System
LIM
LINAC QA01 / 04
Five QA tasks performed with a single device
QA completion time < 20 min (vs. ~60 min conventional)
Laser alignment reproducibility σ = 0.9 mm
Radiation-based deterministic alignment — no iterative adjustment
Winston-Lutz test for automated radiation isocenter measurement
Gantry & collimator angle verification and calibration
TG-142 guideline compliant
Patent registered (Korea 2014) · JACMP 2016 publication
One device for five LINAC QA tasks — a couch-top QA system covering laser alignment through radiation isocenter verification, completing the full workflow in under 20 minutes.
LIM (Linac Isocenter Manager) is a couch-top LINAC QA system that performs five QA tasks — laser alignment, Winston-Lutz test, gantry and collimator angle verification/calibration, light-radiation field coincidence, and field size verification — with a single device. Where conventional practice requires a separate device for each task, LIM completes the entire workflow in one setup.
For laser alignment, LIM applies a radiation-based deterministic method that achieves accurate, repeatable results without iterative adjustment. Alignment reproducibility improves from σ = 1.5 mm with conventional methods to σ = 0.9 mm, and total QA time is reduced from approximately 60 minutes to under 20 minutes.
LIM supports the daily, monthly, and annual QA checklists recommended by AAPM TG-142 guidelines, with results output as an automatic analysis report. The technology is backed by a Korean patent registered in 2014 (Laser alignment device and method for radiation therapy) and a paper published in JACMP in 2016.
- Single-device workflow covering laser alignment, isocenter, and field verification in one session
- Radiation-based deterministic alignment that eliminates iterative re-adjustment
- Quantitative, automated radiation isocenter measurement via Winston-Lutz test
- Supports TG-142 daily, monthly, and annual QA checklists in one system
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