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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.

From: Verifying 4D gated radiotherapy using time-integrated electronic portal imaging: a phantom and clinical study

Patient 2 4DCT (all phases) 4DCT gated (three phases)
  X (Max motion) Y (Max motion) X (1 SD motion) Y (1 SD motion) X (Max motion) Y (Max motion)
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