W. Johnen

Papers

Total Citations

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About

W. Johnen’s research sits at the intersection of medical physics and robotics, with a primary focus on advancing precision in radiation oncology. His most impactful work, the 2019 paper “Development of a robot-assisted ultrasound-guided radiation therapy (USgRT),” has garnered 22 citations and represents a significant step toward integrating real-time soft-tissue imaging into treatment delivery. By combining robotic manipulation with ultrasound guidance, Johnen addresses a critical challenge in radiotherapy: tracking tumor motion during treatment without exposing patients to additional ionizing radiation. This innovation has the potential to improve targeting accuracy for moving tumors, particularly in the abdomen and thorax. In earlier work, Johnen contributed to the validation of 4D dose calculation algorithms using the Calypso tracking system and 3D polymer gel dosimetry. Although this 2017 study has fewer citations, it demonstrates his commitment to rigorous experimental validation—constructing custom phantoms and employing advanced dosimetry to ensure that computational models translate reliably into clinical practice. Johnen’s contributions are notable for bridging engineering and clinical physics, offering practical solutions to the long-standing problem of motion management in radiotherapy.