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Abstract #4832

COMPARISON OF 4D-CT AND 4D- MRI FOR LUNG TUMOUR MOTION MEASUREMENT: A PHANTOM STUDY.

Terry Edward Perkins1, Jonathan Goodwin2, and Peter Greer3
1Sydney university, Rankin Park, Australia, 2Radiation Oncology, Calvary Mater Newcastle, Newcastle, Australia, 3Radiation Oncology, Calvary Mater Hopsital Newcastle, Newcastle, Australia

Using a golden angle radial sampling technique (Siemens WIP#1104), the motion range detection capabilities of 4D-MRI were compared to 4D-CT simulating lung tumour motion using a MODUS QA 4D MRI phantom. Thirteen patient respiratory patterns were used to simulate realistic breathing motion. Repeated measures ANOVA (F=0.052, p=0.948), a post-hoc paired t-test (all p>0.677) and the RMSE (RMSE12 = 1.9 mm) were used to evaluate differences between the detected motion ranges. Results showed no statistically significant difference between the motion range detection capabilities of 4D-CT and 4D-MRI in the phantom. This observation provides evidence for further evaluation in a patient population.

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