Tumor motion and dosimetry variability based on 4DMRI in comparison with 4DCT
Results The motion of the GTV varies from-44% to 177% from 4DCT to 4DMRI, resulting in a
GTV motion variation of-8.2 mm to 6.3 mm, compared with the motion in 4DCT. The mean
GTV from RC-4DMRI and 4DCT are similar on average. In RC-4DMRI, PTV coverage is
severely under dosed and the plan is compromised when the ITV is enlarged due to a larger
volume motion in 4DMRI. When the 4DCT-ITV is directly replaced by the 4DMRI-ITV, severe
under-dosing of the PTV is observed with D95= 85±11%(if setup on bony landmarks without …
GTV motion variation of-8.2 mm to 6.3 mm, compared with the motion in 4DCT. The mean
GTV from RC-4DMRI and 4DCT are similar on average. In RC-4DMRI, PTV coverage is
severely under dosed and the plan is compromised when the ITV is enlarged due to a larger
volume motion in 4DMRI. When the 4DCT-ITV is directly replaced by the 4DMRI-ITV, severe
under-dosing of the PTV is observed with D95= 85±11%(if setup on bony landmarks without …
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