Abstract #3641

Design and initial testing of a thermally insulated phantom system for MR thermometry based coil validation

Ayse Sila Dokumaci^1,2, Daniel West^1,2, Kun Qian³, Aaron Oliver-Taylor⁴, George P. Keeling¹, David Leitao^1,2, Menglu Wu^1,2, Nejat Karadeniz¹, Ronald Mooiweer^5,6, Pierluigi Di Cio^2,7, Sarah McElroy⁸, Tomoki Arichi³, Ozlem Ipek^1,2, Joseph V. Hajnal^1,2, and Shaihan J. Malik^1,2

¹Imaging Physics and Engineering Research Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ²London Collaborative Ultra high field System (LoCUS), London, United Kingdom, ³Early Life Imaging Research Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ⁴Gold Standard Phantoms Limited, Sheffield, United Kingdom, ⁵Medical Physics and Clinical Engineering, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom, ⁶Cardiovascular Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ⁷Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom, ⁸MR Research Collaborations, Siemens Healthcare Limited, Frimley, United Kingdom

Synopsis

Keywords: Phantoms, Phantoms, MR thermometry

Motivation: MR thermometry (MRT) based RF coil safety validation requires precise measurements with high sensitivity.

Goal(s): To maximise MRT coil validation sensitivity by designing a bespoke phantom and phantom holder

Approach: A phantom with embedded temperature probes and oil references for proton resonance frequency shift thermometry was designed, combined with a 3D printed holder that fills the space between the phantom and the coil. This both positions the phantom securely and thermally isolates it, maximizing sensitivity of MRT.

Results: A high degree of thermal isolation was observed, with MRT experiments able to detect significant RF induced temperature changes.

Impact: The thermally insulating 3D printed phantom holder is beneficial for MRT-based RF coil validation studies, enabling stable geometry and minimising environmental temperature loss for SAR estimation. The design can easily be adapted for other coil dimensions and probe positions.

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