Physical Sciences and Mathematics Commons^™

The Correlation Between Internal & External Markers For Abdominal Tumors: Implications For Respiratory Gating, David P. Gierga, Johanna Brewer, Gregory C. Sharp, Margrit Betke, Christopher G. Willett, George T.Y. Chen

Computer Science: Faculty Publications

Purpose: The correlation of the respiratory motion of external patient markers and abdominal tumors was examined. Data of this type are important for image-guided therapy techniques, such as respiratory gating, that monitor the movement of external fiducials.

Methods and Materials: Fluoroscopy sessions for 4 patients with internal, radiopaque tumor fiducial clips were analyzed by computer vision techniques. The motion of the internal clips and the external markers placed on the patient’s abdominal skin surface were quantified and correlated.

Results: In general, the motion of the tumor and external markers were well correlated. The maximum amount of peak-to-peak craniocaudal tumor motion …