ArticleMedical physics2025
Real-time electron spectrometer utilizing a permanent magnet and diode detector array.
Article in Medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
1 citing paper in PubMed.
- Real-time electron spectrometer utilizing a permanent magnet and diode detector array.Medical physics · 2025Article
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Authors and funding
4 authors.
Funding
Abstract
backgroundMagnetic spectrometers have been previously described for measuring energy spectra of therapeutic electron beams. However, challenges for clinical utilization have been their size, weight, and limited real-time capabilities. Development of a compact, lightweight, and inexpensive device with real-time readout will make an electron spectrometer a practical clinical tool. PURPOSE: This work integrates a commercial diode detector array with a permanent dipole magnet to create a practical real-time energy spectrometer for therapeutic electron beams.
methodsA 4 kg, 0.55 T permanent dipole magnet was coupled to two PC boards of a Sun Nuclear SRS MapCHECK device, which provided two interlaced diode arrays that sampled a radiation field with an effective spacing of 0.175 cm. These components were rigidly attached to a copper insert in an Elekta 14 × 14 cm
resultsBackground dose to IC electronics was 11.6 ± 1.7 µGy/MU and 42.8 ± 4.4 µGy/MU for 9 and 20 MeV beams, respectively, allowing >100 h of use at 400 MU/min before receiving 100 Gy. Background to diode detectors was less than 10% of peak signal for 7-20 MeV beams. Individual diode sensitivities varied ±6%, each varying insignificantly with energy. Mapping distal and proximal diode array readings with 0.175 cm spacing provided
conclusionsThis study showed that an SRS MapCHECK diode array coupled with a 0.55 T permanent magnet can be used to construct a real-time electron energy spectrometer that should be compact, lightweight, inexpensive, and practical. It offers accelerator engineers a new tool to improve efficiency and effectiveness of electron beam tuning during commissioning and maintenance. Also, it offers medical physicists a potentially efficient and effective paradigm for machine quality assurance.
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