Abstract
Purpose/Objective: Organ motion during radiation treatment can result in geometric miss of the target volume and ultimately treatment failure. In esophageal cancer there are several factors that may account for variations in the degree of esophageal movement, including respiratory movement. Multi-slice 4D cine mode computed tomography (CT) is a new imaging technology ideally suited to assess organ motion. The 4th dimension, time, allows assessment of change in organ position due to breathing. The aim of this study is to quantify the extent of esophageal gross tumour volume (GTV) motion due to respiration using 4D-CT imaging.
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