According to a study presented today by a University of Pittsburgh researcher at the 46th Annual Meeting of the American Society for Therapeutic Radiology and Oncology (ASTRO) in Atlanta, a new imaging technology may more precisely track tumor movement for patients under treatment for lung cancer than conventional 3D imaging. Results presented indicate that the new technology, 4D CT, or four-dimensional computed tomography, may allow radiation oncologists to determine and predict tumor movement based on the tumor’s location in near real time.
"One of the major challenges in treating lung tumors with radiation is precisely targeting a moving tumor while simultaneously decreasing the amount of healthy tissue that may be exposed," said Dwight Heron, M.D., assistant professor of radiation oncology, University of Pittsburgh School of Medicine and vice chairman of radiation oncology, University of Pittsburgh Medical Center (UPMC) and study co-author. "Lung tumors are akin to moving targets. As a patient inhales and exhales, the tumor moves, making it challenging to target the tumor and to avoid exposure of radiation to the area that surrounds the tumor. By being able to predict tumor movement based on its location and attachment to the lung, we have the ability to more precisely target tumors with radiation therapy."
In the study, lung tumor motion was measured in 12 patients based on multiple images provided by 4D CT. Images were then sorted according to the phase of the respiratory cycle in which the image was acquired. Findings indicated that tumor motion correlated significantly with the position of the tumor on the lungs – tumors that moved more than 5 mm were located in the lower lobes of the lungs and those that moved the most were attached to the posterior, or back, of the lungs. Findings also indicated that tumors that were extensively attached to the chest wall or major airway moved the least.
Clare Collins | EurekAlert!
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