Table 2 Motion of fiducial markers in patient 2 (i) during audio-coached 4DCT scan, (ii) in the gating phases of 4DCT scan, and (iii) TI-EPI during phase end-expiration RGRT.

Cranial clip

1.0 mm

20.0 mm

0.3 mm

8.3 mm

0.0 mm

2.4 mm

Caudal clip

2.0 mm

18.6 mm

0.7 mm

6.7 mm

0.0 mm

2.2 mm

End-expiration gating (17 treatments)

Gating reproducibility (excluding patient set-up errors)

X (Mean error)

Y (Mean error)

X (1 SD motion)

Y (1 SD motion)

Cranial clip

1.0 mm to lateral

0.4 mm to caudal

0.6 mm

1.5 mm

Caudal clip

1.0 mm to lateral

1.4 mm to caudal

0.8 mm

1.4 mm