Fig 1.
(a) Calibration plate; (b) Reflector block; (c) Calibration program interface.
Fig 2.
Distribution of the 70 kg weight.
Fig 3.
The proposed calibration method.
(a) CT coordinate system; (b) Initial setup; (c) Calibration for position 1.
Fig 4.
Schematic diagram of RGSC-like and CT-like measurements.
(a) CT; (b) RGSC.
Table 1.
Coordinate uncertainty (standard deviation) comparison in camera view coordinate system, between Varian calibration method and the proposed calibration method.
Table 2.
Comparison of the residual drifts of simulated DIBH waveforms for Varian calibration method versus the proposed calibration method.
Fig 5.
Comparison of different calibration methods.
(a) Varian calibration method; (b) The proposed calibration method. The yellow segment indicates the CT beam-on time.
Fig 6.
The influence of CT couch sagging on RGSC signal and CT image.
Fig 7.
Comparison of two different calibration with weight for a scan length of 1 m.
(a) The extended calibration proposed by Park et al. [18]; (b) The proposed calibration method. The yellow segment indicates the CT beam-on time. The purple arrow indicates the DIBH trace exceeding the predetermined thresholds during scanning.