In the DIBH technique, the patient is initially maintained at quiet tidal breathing (i.e. normal, relaxed breathing),[3] followed by a deep inspiration, a deep expiration, a second deep inspiration, and breath-hold. At this point the patient is at approximately 100% vital capacity, and simulation, verification, and treatment take place during this phase of breath-holding.[4] Patients will have their lung capacity and natural breathing cycle measured so that a comfortable breath-hold capacity can be set.