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Experimental setup of the tumor motion model. (A) Photograph of the RMSS and three phantoms mounted on the Cine-CT machine; (B) ultrasound image of the diaphragm phantom; (C) 4DCT axial section; (D) photograph of the tumor position for a phase of 50% under 4DCT. RMSS, respiratory motion simulation system; 4DCT, four-dimensional computed tomography.
