TABLE 1.

Patient and treatment characteristics.

No. of patients	25
Age	18–76
Diagnosis	Primary liver/bile duct tumors (18) Liver metastasis (7)
Tumor (GTV) volume (cc)	Mean: 40.2 Range: 1–205
Distance of tumor center of mass to liver dome (cm)	Mean: 2.0 Range: 0.6–4.4
Prescription dose (Gy)	Mean: 46.4 Range: 30–60
No. of fractions	Mean: 3.7 Range: 1–5
No. of breath‐holds per fraction	Mean: 7.8 Range: 3–14
Treatment technique	Coplanar VMAT
Respiratory motion management	DIBH with ABC
Image guidance technique	CBCT‐based alignment, and kV‐triggered imaging for online breath‐hold reproducibility monitoring