Four-Dimensional Computed Tomography Based Respiratory-Gated Radiotherapy with Respiratory Guidance System: Analysis of Respiratory Signals and Dosimetric Comparison

Table 2

The root mean square error (RMSE) of maxima, minima, and period in the three breathing conditions.

(a) The RMSE of maxima (full inspiration)

	Free	Audio-guided	Complex system-guided	P value
Maxima (cm)	0.154 ± 0.096	0.119 ± 0.057	0.061 ± 0.024	0.031

Free breathing versus audio-guided breathing (P = 0.216).
Free breathing versus complex system-guided breathing (P = 0.004).
Audio-guided breathing versus complex system-guided breathing (P = 0.001).

(b) The RMSE of minima (full expiration)

	Free	Audio-guided	Complex system-guided	P value
Minima (cm)	0.220 ± 0.085	0.174 ± 0.095	0.099 ± 0.053	0.007

Free breathing versus audio-guided breathing (P = 0.020).
Free breathing versus complex system-guided breathing (P = 0.000).
Audio-guided breathing versus complex system-guided breathing (P = 0.020).

(c) The RMSE of period

	Free	Audio-guided	Complex system-guided	P value
Period (sec)	0.951 ± 0.130	0.741 ± 0.213	0.464 ± 0.215	0.046

Free breathing versus audio-guided breathing (P = 0.370).
Free breathing versus complex system-guided breathing (P = 0.009).
Audio-guided breathing versus complex system-guided breathing (P = 0.040).