Patients With Liver Metastases From Colorectal Cancer Clinical Trial
Official title:
Modelling Internal Hepatic Movement With an External Abdominal Marker Block for Use With a Real Time Position Monitoring System for Respiratory Gating
This study tests the feasibility and reproducibility of patient-specific motion models. These will be used for quantification of safe margin reduction. Patient-specific motion models will be built by post-processing 4D MRI data with non-rigid registration. By comparing these models between visits, model reproducibility will be assessed, and the methodology refined.
The study will use a real time position management (RPM) system for respiratory gating. The
RPM system senses the respiration motion of the patient by tracking a pair of reflective
markers on a lightweight "marker block" constructed of a synthetic material. This block is
placed on the patient's abdomen.
During Radiotherapy, the beam is only switched on at pre-determined phases of respiration.
The appropriate phase of respiration is determined by the RPM system. This implies a
reliable correlation of external block motion to internal hepatic movement. This correlation
is not a simple one, and requires "modeling".
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Time Perspective: Prospective