Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1885700 | Medical Dosimetry | 2006 | 7 Pages |
Abstract
Respiration-induced target and organ motion impacts the radiotherapy strategies of some cancers. Various methods and techniques have been used to investigate motion-related radiotherapy issues, including retrospective 4-dimensional (4D) computed tomography (CT), prospective gated CT, and breath-hold CT scans. This paper reviews these methods and, particularly, the method using retrospective 4D CT scans, which has been developed at our institution. Some motion studies based on retrospective 4D CT images of patients are also examined. These studies have led to reduced planning target volume (PTV) margins for a number of patients, because the respiratory motion was observed to be minimal or gated radiotherapy was used. Respiratory motion managed CTs and, particularly, retrospective 4D CTs are proving to be useful for measuring soft tissue motion, identifying patients who could benefit from gated radiotherapy, and evaluating the effects of respiratory motion during radiotherapy.
Related Topics
Physical Sciences and Engineering
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Radiation
Authors
Edward D. Ph.D., Dwight M.D., Andrew Ph.D., M. Saiful Ph.D., Ning J. Ph.D., Hungcheng M.S.,