PRIMARY OBJECTIVES:
I. To assess the feasibility of performing computed tomography (CT) perfusion imaging (CT perfusion imaging) at baseline, within 48 hours post-stereotactic ablative radiation therapy (SABR), and at 2-4 months SABR in patients undergoing SABR for treatment of a lung tumor per standard of care.
SECONDARY OBJECTIVES:
1. To determine the range (variability) of perfusion parameters at baseline, within 48 hours post-SABR, and at 2-4 months post-SABR
2. To assess the change in perfusion parameters at baseline, within 48 hours post-SABR, and at 2-4 months post-SABR
3. To correlate any change in perfusion parameters with circulating-tumor deoxyribonucleic acid (DNA) levels at baseline, within 48 hours post-SABR, and at 2-4 months post-SABR
4. To correlate perfusion parameters with tumor response 1 year post-SABR
OUTLINE:
Patients receive an infusion of Isovue-200 and undergo CT perfusion imaging of the lungs at baseline, within 48 hours of first SABR, and at 2-4 months after completion of SABR. Cancer Personalized Profiling by Deep Sequencing (CAPP-Seq) will be conducted evaluate circulating-tumor DNA levels.
Perfusion parameters will be correlated with tumor control at 1 year post-SABR, with tumor control defined as no evidence of disease seen at the site of SABR by surveillance imaging at 1 year post-SABR.
After completion of treatment, patients are followed up at 2-4 months and then at 1 year.
