5.5.6 Electromagnetic beacons -- 5.6 Delivery techniques and considerations -- 5.6.1 3D conformal radiotherapy -- 5.6.2 Intensity-modulated radiotherapy -- 5.6.2.1 Volumetric modulated Arc therapy -- 5.6.2.2 TomoTherapy -- 5.6.3 Normal lung dose -- 5.6.4 MLC interplay effect -- 5.6.5 Dose rate and treatment time -- 5.7 Summary -- 5.7.1 Margin reduction -- 5.7.2 Clinical outcome of IGRT for lung cancer -- Acknowledgment -- References -- Chapter 6: Quality assurance of IGRT -- 6.1 Introduction -- 6.2 QA of imaging modalities used in IGRT -- 6.2.1 Major components of IRT QA -- 6.2.1.1 Imaging system performance -- 6.2.1.2 Repositioning accuracy -- 6.2.1.3 Geometric accuracy -- 6.2.2 QA frequency and action levels -- 6.3 QA of IGRT with motion management -- 6.3.1 4D QA -- 6.3.2 Image registration with CBCT for motion -- 6.3.3 QA program for a treatment delivery machine with gating -- 6.3.4 Patient-specific QA for gated/breath-hold imaging -- 6.4 QA for motion-adaptive image guidance (IGART) -- 6.4.1 Main components of motion-adaptive IGART systems -- 6.4.1.1 Identify -- 6.4.1.2 Anticipate -- 6.4.1.3 Beam re-alignment -- 6.4.1.4 Adapt and assess -- 6.5 IGRT credentialing process for clinical trials -- 6.5.1 IGRT protocols -- 6.5.1.1 Independent verification of individual institution specific image registration shifts -- 6.5.2 Motion management protocols -- 6.6 Current developments in IGRT QA -- References -- Part 3: Practice of IGRT for lung cancer -- Chapter 7: L-shaped linacs -- Chapter 7.1: Introduction -- 7.2 Overview of the currently commercially available L-shaped linacs -- 7.2.1 Elekta versa HD -- 7.2.2 Varian TrueBeam -- 7.2.3 Novalis system -- 7.3 IGRT on L-shaped linacs -- 7.3.1 MV ports -- 7.3.2 MV fluoroscopy -- 7.3.3 kV radiograph -- 7.3.4 kV fluoroscopy -- 7.3.5 KV CBCT (4D CBCT) -- 7.3.6 Fixed floor mounted 2D-3D registration: Brainlab