Combined Deep Inspiration Breath Hold (DIBH)-Expiration Planning Technique in Patients With Lung Tumors in Close Proximity to the Chest Wall

Different radiation plans will be generated-one using a DIBH scan with corresponding target and normal tissue contour and a second using an expiration scan with corresponding target and normal tissue contours. The expiration scan can be an expiratory gating scan averaging the expiratory breathing phases or an expiration breath hold scan as determined based on patient performance during simulation and relative tumor displacement compared to the DIBH scan. Then a third plan will be generated conceptually combining the two previous plans, named the DIBH-expiration composite plan.