Comfort Level of Two Abdominal Compression Methods Used to Hold Patients Still While Undergoing Stereotactic Body Radiation Therapy for Lung Tumors

RATIONALE: Stereotactic body radiation therapy may be able to send x-rays directly to the tumor and cause less damage to normal tissue. Abdominal compression methods that hold the body and the tumor from moving during treatment may permit radiation therapy to kill more tumor cells. This study is looking at the comfort level of two abdominal compression methods in patients with lung tumors undergoing stereotactic body radiation therapy. PURPOSE: This phase I trial is studying the comfort level of two abdominal compression methods used to hold patients still while undergoing stereotactic body radiation therapy for lung tumors.