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High resolution silicon array detector implementation in an inline MRI-linac.

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The MagicPlate-512 detector shows promise for dynamic dosimaging on MRI-linacs, achieving high-resolution beam profiles comparable to film. However, radiofrequency noise during imaging requires further mitigation for successful real-time dose validation.

Keywords:
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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Medical Imaging

Background:

  • Magnetic Resonance Imaging-guided Linear Accelerators (MRI-linacs) integrate imaging and radiation delivery.
  • Dynamic dosimaging aims to validate radiation dose in real-time during treatment on MRI-linacs.
  • High-resolution detectors are crucial for accurate dynamic dosimaging.

Purpose of the Study:

  • To evaluate the performance of the novel MagicPlate-512 (M512) silicon array detector for dynamic dosimaging on a 1.0 Tesla (T) MRI-linac.
  • To assess the M512's accuracy in measuring beam profiles with and without simultaneous MRI sequences.
  • To investigate the impact of the M512 detector on MRI image quality.

Main Methods:

  • The M512 detector, featuring 512 sensitive volumes, was used to measure beam profiles in solid water and lung phantoms at 1.0 T and 0 T.
  • Measurements were compared against Gafchromic EBT3 film to identify magnetic field effects.
  • Beam profiles and MR images were acquired during gradient echo (GRE) imaging sequences to assess performance under dynamic conditions.

Main Results:

  • The M512 demonstrated good agreement with film, with average differences in penumbral width and full width at half maximum (FWHM) less than 1 mm without imaging.
  • Simultaneous MRI acquisition introduced radiofrequency (RF) noise, widening the penumbra by up to 1.2 mm.
  • RF noise and artifacts from detector components (aluminum, USB cable) degraded MR image quality, preventing successful dynamic dosimaging in this configuration.

Conclusions:

  • The M512 detector is capable of high-resolution beam profile measurements on an MRI-linac, comparable to film.
  • Significant noise reduction strategies are necessary to overcome RF interference for effective dynamic dosimaging.
  • Further development is needed to realize the full potential of the M512 for real-time dose verification in MRI-guided radiotherapy.