RT3DE image quality scores.

The 3D image quality was assessed as follows:1′: unacceptable-image quality was not measurable;2′: poor-image was judged as measurable but was suboptimal with artifacts;3′: acceptable-image was clear, measurable and diagnostic;4′: good-image was good, easily measurable and artifact was rarely present;5′: excellent-image was extremely clear with all sharp borders for confident diagnosis and measurement.