Publications by authors named "Kouichi Shibayama"
Purpose: Having implemented amplitude-based respiratory gating for scanned carbon-ion beam therapy, we sought to evaluate its effect on positional accuracy and throughput.
Methods And Materials: A total of 10 patients with tumors of the lung and liver participated in the first clinical trials at our center. Treatment planning was conducted with 4-dimensional computed tomography (4DCT) under free-breathing conditions.
Registration of patient anatomical structures to the reference position is a basic part of the patient set-up procedure. Registration of anatomical structures between the site of beam entrance on the patient surface and the distal target position is particularly important. Here, to improve patient positional accuracy during set-up for particle beam treatment, we propose a new visualization methodology using digitally reconstructed radiographs (DRRs), overlaid DRRs, and evaluation of overlaid DRR images in clinical cases.
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- A new treatment facility for carbon ion scanning beam therapy was built, with successful clinical trials starting in November 2011.
- The study involved 11 patients with various tumors, assessing the accuracy of patient setup by comparing CT scans to final images using advanced registration software.
- Results showed a decrease in positional errors over time, indicating that as therapists gained experience, the setup accuracy improved significantly.