First experimental evaluation of a high-resolution deep silicon photon-counting sensor

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Brunskog, RickardKTH,Medicinsk bildfysik,Karolinska University Hospital, MedTechLabs, BioClinicum, Solna, Sweden (author)

First experimental evaluation of a high-resolution deep silicon photon-counting sensor

Article/chapterEnglish2024

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SPIE-Intl Soc Optical Eng,2024
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LIBRIS-ID:oai:DiVA.org:kth-344351
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-344351URI
https://doi.org/10.1117/1.JMI.11.1.013503DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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QC 20240314
Purpose: Current photon-counting computed tomography detectors are limited to a pixel size of around 0.3 to 0.5 mm due to excessive charge sharing degrading the dose efficiency and energy resolution as the pixels become smaller. In this work, we present measurements of a prototype photon-counting detector that leverages the charge sharing to reach a theoretical sub-pixel resolution in the order of 1 μm. The goal of the study is to validate our Monte-Carlo simulation using measurements, enabling further development. Approach: We measure the channel response at the MAX IV Lab, in the DanMAX beamline, with a 35 keV photon beam, and compare the measurements with a 2D Monte Carlo simulation combined with a charge transport model. Only a few channels on the prototype are connected to keep the number of wire bonds low. Results: The measurements agree generally well with the simulations with the beam close to the electrodes but diverge as the beam is moved further away. The induced charge cloud signals also seem to increase linearly as the beam is moved away from the electrodes. Conclusions: The agreement between measurements and simulations indicates that the Monte-Carlo simulation can accurately model the channel response of the detector with the photon interactions close to the electrodes, which indicates that the unconnected electrodes introduce unwanted effects that need to be further explored. With the same Monte-Carlo simulation previously indicating a resolution of around 1 μm with similar geometry, the results are promising that an ultra-high resolution detector is not far in the future.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Medicinteknik Annan medicinteknik hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering Other Medical Engineering hsv//eng
computed tomography
deep silicon
photon-counting
ultra-high resolution

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Persson, Mats,1987-KTH,Medicinsk bildfysik,Karolinska University Hospital, MedTechLabs, BioClinicum, Solna, Sweden(Swepub:kth)u1keei5w (author)
Jin, ZihuiKTH,Medicinsk bildfysik(Swepub:kth)u1qt1doi (author)
Danielsson, Mats,ProfessorKTH,Medicinsk bildfysik,Karolinska University Hospital, MedTechLabs, BioClinicum, Solna, Sweden(Swepub:kth)u1m3qe0f (author)
KTHMedicinsk bildfysik (creator_code:org_t)

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In:Journal of Medical Imaging: SPIE-Intl Soc Optical Eng11:12329-43022329-4310

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