Affiliation:
1. Department of Medical Physics Northwestern Medicine Proton Center Warrenville Illinois USA
2. Leo Cancer Care Middleton Wisconsin USA
3. Department of Medical Physics and Biomedical Engineering Leo Cancer Care Horley UK
Abstract
AbstractThis study presents position changes of a few radiotherapy‐relevant thoracic organs between upright and typical supine patient orientations. Using tools in a commercial treatment planning system (TPS), key anatomical distances were measured for four‐dimensional CT data sets and analyzed for the two patient orientations. The uncertainty was calculated as the 95% confidence interval (CI) on the relative difference for each of the four analyzed changes for upright relative to supine, as follows: the distance of the bottom of the heart to the top of the sternum, it changed +2.6% or +4 mm (95% CI [+0.30%,+4.9%]); the distance of the center of the C3 vertebra to the backrest, it changed +29% (95% CI [+22%,+36%]); the contoured left and right lungs increased their volumes respectively: +17% (95% CI [+12%,+21%]) for the left, and +9.9% (95% CI [+4.1%,+16%]); and lastly, the distance from the top of the sternum to the top of the liver, but its uncertainty far exceeded the average change by a factor of two. This last result is therefore inconclusive, the others show that with 95% confidence that a change in internal positions is observed for lung volumes and heart position that could be important for upright treatments.
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Radiation
Cited by
2 articles.
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