Yanlu Wang, Feng He, Zaihong Hou, Xu Jing, Yilun Cheng. Displacement Monitoring for Radiotherapy Patients Using in Vitro Markers[J]. Laser & Optoelectronics Progress, 2023, 60(2): 0217004
- Laser & Optoelectronics Progress
- Vol. 60, Issue 2, 0217004 (2023)
Fig. 1. Comparison of different types of markers under cover of thermoplastic film. (a) X corner marker under cover of thermoplastic film; (b) rectangular marker under cover of thermoplastic film; (c) round marker under cover of thermoplastic film
Fig. 2. Schematic diagram of marker design
Fig. 3. Comparison of reflected light from different material markers. (a) Schematic diagram of retro-reflected light by microprism reflective film; (b) schematic diagram of light reflected by diffuse reflection material
Fig. 4. Flow chart of outer contour point of marker extraction algorithm
Fig. 5. Flow chart of improved ellipse fitting algorithm
Fig. 6. Small hole imaging model
Fig. 7. Experimental platform building diagram
Fig. 8. Experimental results of marker fitting and positioning. (a) Original image; (b) B channel image minus R channel image result; (c) contour extraction of markers; (d) find convex hull of contour ;(e) traditional least squares ellipse fitting; (f) proposed improved least squares ellipse fitting
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Table 1. Hardware equipment and main parameters of experimental platform
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Table 2. Displacement measurement accuracy verification experiment results
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Table 3. Comparison before and after algorithm improvement
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