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Respiratory motion management during the thoracoabdominal tumor treatment is one of the biggest challenges in modern image-guided radiation therapy (RT). MRI enables the long-term, dose-free, soft-tissue monitoring, representing clear advantages over x-ray-based imaging modalities. Given unique requirements of RT guidance-quality (high temporal resolution, and modest spatial resolution and SNR), we have been investigating the adaptation of kt BLAST. We have also developed MRI-compatible, programmable, and externally and internally deformable lung motion phantom, which replicates respiratory motion traces acquired from lung cancer patients. To our knowledge, this is the first report of using kt BLAST for lung cancer radiotherapy motion management.