Interfractional Variations of Tumor Centroid Position and Tumor Regression during Stereotactic Body Radiotherapy for Lung Tumor

Table 2

Magnitude (in millimeters) of tumor motion assessed on fluoroscopy.

Location of lung tumor	SI (Mean ± SD)	AP (Mean ± SD)	RL (Mean ± SD)
Upper lobe
Middle lobe
Lower lobe
Total

SI = superior-inferior; AP = anterior-posterior; RL = right-left; SD = standard deviation.