Background
Methods
Phantom study
Clinical study
RSA set-up
Analysis of stereoradiographs
Statistics
Results
Phantom study
Phantom study (n = 4 phantoms) | X-axis (sternal separation) | Y-axis (proximal-distal translation) | Z-axis (anterior-posterior translation) |
---|---|---|---|
Sternum Meandiff (mm) | 0.00 | 0.00 | −0.07 |
SDdiff (mm) | 0.02 | 0.04 | 0.31 |
Phantom Position / Axes | X axis (sternal separation) Mean (SD) | Y axis (proximal-distal translation) Mean (SD) | Z axis (anterior-posterior translation) Mean (SD) |
---|---|---|---|
Neutral | |||
Separation 0–1 mm | 0.52 (0.35) | −0.11 (0.16) | −0.53 (0.52) |
Separation 1–2 mm | 1.05 (0.1) | −0.36 (0.14) | 0.04 (0.12) |
Separation 2–3 mm | 1.06 (0.13) | −0.41 (0.15) | −0.29 (0.22) |
Mean neutral | 0.88 (0.25) | 0.29(0.13) | −0.26 (0.23) |
15° Cranial tilt | |||
Separation 0–1 mm | 0.54 (0.34) | −0.03 (0.16) | −0.65 (0.32) |
Separation 1–2 mm | 1.09 (0.08) | −0.35 (0.07) | −0.06 (0.18) |
Separation 2–3 mm | 1.05 (0.1) | −0.35 (0.23) | −0.44 (0.77) |
Mean 15° cranial tilt
| 0.89 (0.25) | −0.24 (0.15) | −0.38 (0.24) |
15° Caudal tilt | |||
Separation 0–1 mm | 0.52 (0.31) | 0.19 (0.15) | −0.46 (0.43) |
Separation 1–2 mm | 1.04 (0.07) | 0.37 (0.12) | −0.01 (0.16) |
Separation 2–3 mm | 1.03 (0.11) | 0.44 (0.07) | −0.17 (0.37) |
Mean 15° caudal tilt
| 0.86 (0.24) | 0.33 (0.11) | −0.21 (0.19) |
Clinical study
Clinical position / Axes | X axis (sternal separation) | Y axis (proximal-distal translation) | Z axis (anterior-posterior translation) |
---|---|---|---|
Mean (SD) | Mean (SD) | Mean (SD) | |
Inspiration (n = 7) | 0.09 (0.24) | − 0.16 (0.30) | 0.53 (0.96) |
Expiration (n = 7) | −0.13 (0.19) | −0.40 (0.36) | 1.13 (1.22) |
Combined (n = 14) | 0.07 (0.21) | −0.55 (0.32) | 0.67 (1.06) |
CR (precision) (n = 14) | 0.42 mm | 0.63 mm | 2.08 mm |