This study is a research and development initiative established to explore the use of magnetic resonance imaging (MRI) as a tool for managing organ motion of the liver in cancer patients planning procedures for stereotactic body radiation therapy (SBRT).

There is a potential role to systematically implement MRI to establish appropriate workflow of the implementation for tumor motion management in liver SBRT. Compared to CT, MRI has many significant advantages for radiotherapy planning, including superior tumor and soft-tissue contrast, flexible imaging orientation, freedom from radiation exposure and real-time imaging. MRI solely based liver SBRT will allow for more precise delineation of target volume, less uncertainties in treatment planning, better motion management, and potentially better treatment outcome

Inclusion Criteria:

• Age ≥ 21
• Patients with primary stage I, II, III liver cancer or metastatic tumor in the liver from any cancer site
• Signed, specific informed consent prior to study entry
• Women of child bearing potential must have a negative serum pregnancy test

Exclusion Criteria:

• Any condition for which a MRI procedure is contraindicated including presence of metallic material in the body, such as pacemakers, non- MRI compatible surgical clips, shrapnel.
• Pregnant or breast-feeding women are excluded.
• Subjects who have difficulty lying flat on their back for extended periods of time

Patients with stage I, II, III primary liver cancer Patients with metastatic liver cancer from any cancer site