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Abstract #4053

A radiolucent 32-channel high impedance coil receive array to accelerate 3D imaging on hybrid 1.5 T MR-linac systems

Stefan Emiel Zijlema1,2, Luca van Dijk1, Jan J.W. Lagendijk1, Dennis W.J. Klomp3, Catalina S. Arteaga de Castro4, Rob H.N. Tijssen1, and Cornelis A.T. van den Berg1,2
1Department of Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Computational Imaging Group for MRI diagnostics and therapy, Centre for Image Sciences, UMC Utrecht, Utrecht, Netherlands, 3Department of Radiology, UMC Utrecht, Utrecht, Netherlands, 4Tesla Dynamic Coils, Zaltbommel, Netherlands

High impedance coils (HICs) offer major advantages for use during MRI-guided radiotherapy (MRIgRT), as they lack lumped elements that can attenuate radiation. Furthermore, their flexibility and low channel coupling simplify high-density array development and enable on-body placement.

Here, we present a fully functional 32-channel HIC array, confirmed its radiation transparency (radiolucency) and compared the imaging performance with the current clinical (LIC-based) array.

Dosimetrically, no clinically significant attenuation was caused by the array. Imaging-wise, the prototype showed higher SNR values and lower g-factors, thus allowing for faster imaging.

In conclusion, our 32-channel array can accelerate all imaging for MRIgRT applications.

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