IMRT
Intensity-Modulated Radiation Therapy — uses MLC to vary beam intensity across each treatment field, producing highly conformal dose distributions that spare adjacent organs at risk. Clinical standard for most treatable cancers since the 2000s. VMAT (rotational IMRT) is the modern delivery evolution.
Why it matters to buyers: Clinical standard treatment technique. MLC is the prerequisite hardware. Plan-quality differences across MLC tiers (Millennium 120 vs HD120 vs Agility) are physicist-visible.
Why it matters to engineers: Step-and-shoot vs sliding-window delivery — the latter is faster and now the dominant workflow. Patient-specific QA before each plan; TG-142 daily / monthly QA on the underlying machine.