Abstract #2721

A radiation-transparent, rotatable receive-only extremity RF coil for flexible MR-guided particle therapy at 0.25 T

Kilian A. Dietrich^1,2,3,4, Stephan Orzada^1,2, Thomas M. Fiedler², Fabian Dinkel^5,6, Gernot Echner^5,6, Sebastian Klüter^1,6,7, Jürgen Debus^{1,3,4,6,7,8,9,10,11}, Mark E. Ladd^2,3,11, and Tanja Platt^1,2,4

¹Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany, ²Department of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ³Faculty of Physics, Heidelberg University, Heidelberg, Germany, ⁴Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁵Division of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ⁶Heidelberg Institute of Radiation Oncology (HIRO), Heidelberg, Germany, ⁷National Center for Radiation Research in Oncology (NCRO), Heidelberg, Germany, ⁸Heidelberg Ion-Beam Therapy Center (HIT), Heidelberg University Hospital, Heidelberg, Germany, ⁹German Cancer Consortium (DKTK), Heidelberg, Germany, ¹⁰National Center for Tumor Diseases (NCT), Heidelberg, Germany, ¹¹Faculty of Medicine, Heidelberg University, Heidelberg, Germany

Synopsis

Keywords: MR-Guided Radiotherapy, MR-Guided Interventions, Particle therapy

Motivation: MR-guided particle therapy (MRgPT) could improve tumor control and reduce healthy tissue dose, thereby increasing quality of therapy compared to conventional CT-guided radiotherapy.

Goal(s): Development of a rotatable, radiation-transparent extremity radiofrequency (RF) coil suitable for MRgPT at a 0.25T C-shaped magnet.

Approach: The receive field homogeneity of the RF coil was evaluated for different rotation angles in electromagnetic field simulations, and the SNR was investigated in a homogeneous phantom in comparison to two commercial coils.

Results: The constructed extremity RF coil including a custom-built preamplifier achieves improved receive field homogeneity and SNR compared to two commercial RF coils and is compatible with MRgPT.

Impact: The rotatable, radiation-transparent RF coil enables MRgPT with through-coil irradiation and multi-angle access to the patient. The developed RF coil and preamplifier design provides better RF field homogeneity and SNR over a larger FOV compared to two commercial RF coils.

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