Table 1.

Patient characteristics and SBRT treatment details.

Patients (n)	30
Age [median (range)] (y)	72 (45 – 83)
Gender: male/female (n)	19/11
Diagnosis (n)
Primary liver cancer	15
Liver metastases	15
No. GTV [median (range)] (n)	2 (1 – 5)
GTV volume [mean (range)] (cc)	162 (4 – 707)
Motion management (n)
Free-breathing	11
Abdominal compression plate	19
Planned fluoroscopy motion [mean (range)] (mm)	9 (2 – 17)
PTV [mean (max)] (mm)
Left	6 (13)
Right	5 (7)
Anterior	7 (20)
Posterior	5 (8)
Superior	5 (6)
Inferior	12 (23)
No. beams, excluding segments [median (range)] (n)	6 (4 – 15)
Liver NTCP [mean (range)] (%)	1.8 (0 – 15.2)
Prescribed dose in 6 fractions [mean (range)] (Gy)	39 (27 – 60)

Abbreviations: GTV=gross tumour volumes; PTV=planning target volume; NTCP=normal tissue complication probability (biologically corrected to 2 Gy/fraction).