Abstract
Multiple vendors are now offering real-time MRI-guided radiotherapy systems. Quality assurance of small fields delivered with an MR-RT system requires detectors with high spatiotemporal resolution, and magnetic insensitivity. High spatial resolution is required to characterise the asymmetric penumbra that transverse designs demonstrate. In this work the authors describe the characterisation of the dosimetric performance of a monolithic silicon strip detector mounted to a flexible polymide (Kapton) printed circuit board intended for use in MRI-linac dosimetry.
Highlights
There are multiple vendors offering radiotherapy systems with online magnetic resonance (MR) image guidance
In this work the authors describe the characterisation of the dosimetric performance of a monolithic silicon strip detector mounted to a flexible polymide (Kapton) printed circuit board intended for use in MRI-linac dosimetry
The uniformity of the sDMG-256A in figure 3 shows before applying the equalization vector detectors channel response relative to the central channel for 99% of channels were within ±5%
Summary
There are multiple vendors offering radiotherapy systems with online magnetic resonance (MR) image guidance. These systems can provide superior soft tissue contrast compared to kV photon image guidance technologies. The Elekta Unity integrates a 7MV flattening-filter free linac system with a 1.5T MRI scanner [1,2,3]. In both systems the magnetic field axis is perpendicular to the beam axis. With this configuration the Lorentz force that acts on secondary electrons causes electron return effect (ERE) at high/low density interfaces and creates lateral asymmetry in beam penumbra [4]
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