. Author manuscript; available in PMC: 2022 Jul 1.

Published in final edited form as: Pract Radiat Oncol. 2021 Mar 2;11(4):282–298. doi: 10.1016/j.prro.2021.02.007

Table 6.

Summary of some of the limited reported commercial DIR results in the abdomen/pelvis (liver) for common commercial algorithms for CT-CT (or 4DCT) registration

	Data set	No. of cases	Software [no. of institutions]	Results
Fukumitsu et al²⁷	Patient — pre/post treatment CT	24	MIM [1] Velocity [1]	TRE mean (fiducials): (noncontrast/contrast CT) 9.3 ± 9.9 mm/7.4 ± 7.7 mm 11.0 ± 10.0 mm/8.9 ± 7.2 mm
Velec et al³⁹	Patient — 4DCT	10	Raystation (Biomechanical) [1] Raystation (Hybrid intensity) [1] Raystation (Biomechanical) [1] Raystation (Hybrid intensity) [1]	Mean DTA for:^* kidneys, stomach, spleen^†, liver^† 1.5, 1.9, 0.7, 0.8 mm 0.7, 1.3, 0.1, 0.3 mm Mean TRE for liver (vessels POI)^*: 2.6 mm 3.3 mm
Ribeiro et al⁵¹	Patient — synthetic 4DCT (derived from 4D MRI DVF and exhale CT)	9 (3 patients × 3 DVFs)	Raystation (Hybrid Intensity) [1] Raystation (Biomechanical) [1] Mirada	Mean proton field-specific geometric error (mm) for 3 DVFs: 1.05, 2.44, 2.84 1.01, 2.34, 2.66 0.74, 1.93, 2.34

Abbreviations: 4D = 4-dimensional; CT = computed tomography; DIR = deformable image registration; DVF = deformation vector field; MRI = magnetic resonance imaging; TRE = target registration error.

Value estimated from figure.

^†

Used as a controlling structure in DIR.