A Prospective Study of Performing MRI Simulation in Treatment Position in Spinal Stereotactic Body Radiation Therapy

• Objectives

• Assess the feasibility of performing MRI scans in the treatment position for accurate treatment planning and dose delivery in spinal stereotactic body radiation therapy (spinal SBRT).
• Characterize the improved accuracy of image fusion between MRI and CT and its dosimetric impact when performing MRI scans in treatment position in spinal SBRT.
• Assess the ability of MRI simulation to accurately target extended spinal targets beyond the current targeting limitations (>3 consecutive vertebral body levels)
• Optimize the workflow of using MRI simulation in treatment planning and dose delivery.

3.1. Inclusion Criteria

• Greater than or equal to 18 years of age
• Pathologically confirmed diagnosis of cancer, including, but not limited to non-small cell lung cancer, breast, prostate, renal cell, melanoma, gastrointestinal, sarcoma, thyroid, head and neck primary, and carcinoma of unknown primary
• Signed informed consent
• Willing to undergo 2 MRI simulations in one or multiple sessions, one with immobilization device, and the other without.
• Patients undergoing spinal SBRT 3.2. Exclusion Criteria

a. Patient with a relative or absolute contraindication to MRI (such as pacemaker, etc.) b. Patients with significant instrumentation or cement at the site of interest causing artifact c. Inability to tolerate with immobilization device for greater than 30 minutes