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Table 4 Summary of respiration-induced liver motions in the references and the present study

From: Quantitative analysis of respiration-induced motion of each liver segment with helical computed tomography and 4-dimensional computed tomography

Reference Year Method Number of patient Magnitude of motion SI direction (mm) Abdominal compression Individual segment evaluation
[5] 1999 MRI 1 21 No No
[21] 2003 MRI 12 24.4 No No
[22] 2003 RTRT w/ fiducial 20 8 (left)
9 (right)
No No
[23] 2009 RTRT w/ fiducial 6 15.98 No No
[24] 2010 CBCT 29 8 15/29 No
[25] 2007 4DCT 9 15 (supine)
12.5(prone)
No No
[26] 2012 4DCT CBCT w/ fiducial 20 17.9 (4DCT)
16.5 (CBCT)
No No
[27] 2017 4DCBCT w/ fiducial 10 5.3 (planning simulation 4DCBCT)
4.5 (pre-SBRT 4DCBCT)
10/10 No
[15] 2011 4DCT w/ DIR 21 10 6/21 No
[17] 2012 4DCT w/ DIR 18 9.7 No No
[16] 2013 4DCT w/ DIR 15 7.9 No No
Present study   4DCT w/ DIR 20 8.6 (Segment 7) No Yes
  1. Abbreviations: MRI magnetic resonance imaging, RTRT real-time tumor-tracking radiotherapy system, CBCT cone-beam computed tomography, 4DCT 4-dimensional computed tomography, 4DCBCT 4-dimensional cone-beam computed tomography, DIR deformable image registration, SBRT stereotactic body radiotherapy, SI superior-inferior