Inclusion Criteria:The inclusion criteria for lung and liver cancer patients are:

• Patient is 21 or older
• Patient has primary or metastatic tumor(s) in the lungs or the liver
• Diameter of the tumor(s) is less than 7 cm
• Patient will receive radiation therapy (ordered by the treating Radiation Oncologist) as part of their treatment regimen
• Patient will undergo a planning CT scan with tumor motion assessment (planning 4D-CT ordered by the treating Radiation Oncologist) as part of their treatment regimen
• Patient has signed informed consent and is willing to comply with the 4D-MRI imaging protocol

The inclusion criteria for healthy volunteers are:

• Subject is 18 or older
• Subject has signed informed consent and is willing to comply with the 4D-MRI imaging protocol

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, etc.
• Subjects who have difficulty lying flat on their back for extended periods of time
• Patients with any serious/poorly controlled medical or psychological conditions that would complicate protocol compliance
• Too large to adequately fit in the magnet bore or RF coils
• Claustrophobia
• Females who are pregnant or lactating
• Presence of active or chronic infection