SBRT, motion management, liver metastates, GTV, PTV, isodose, respiration induced motion, diaphragm motion, hysteresis, fluoroscopy, CT scan, 4 DCT scan, USG, FSB (forced shallow breathing), DIBH, DEBH, ABC (active breathing control), ITV, respiratory gating, residual motion, multifocal HCC, motion artifacts, breath hold, abdominal compression, breathing coaching, assess magnitude and direction of motion