2017_IGRT course book

Comparison of systems

Seeds 0.9 × 3.0 mm, CIVCO

OBI half fan half bow-tie filter 360 degree gantry rotation Reconstruction:512 × 512 resolution; 2mm slice thickness

95% Limits of agreement 3 observers

Right left (mm)

Superior Inferior (mm)

Anterior Posterior (mm)

CBCT fiducial markers

<2mm <2mm <2mm

CBCT soft tissue

<3mm <3mm <3mm

Average CBCT Fiducial markers compared CBCT Soft tissue

-1.6 to 2.5 -4.9 to 2.6

-4.7 to 1.9

Deegan 2014, Journal of Medical Imaging and Radiation Oncology