R
Richard Walker
Researcher at University of Edinburgh
Publications - 32
Citations - 1082
Richard Walker is an academic researcher from University of Edinburgh. The author has contributed to research in topics: Image sensor & Silicon photomultiplier. The author has an hindex of 14, co-authored 32 publications receiving 1004 citations.
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Journal ArticleDOI
A Fully Digital 8 $\,\times\,$ 16 SiPM Array for PET Applications With Per-Pixel TDCs and Real-Time Energy Output
Leo H. C. Braga,Leonardo Gasparini,Lindsay A. Grant,Robert Henderson,Nicola Massari,Matteo Perenzoni,David Stoppa,Richard Walker +7 more
TL;DR: Characterization of gamma detection performance with an 3 × 3 × 5 mm3 LYSO scintillator at 20°C is reported, showing a 511-keV gamma energy resolution of 10.9% and a coincidence timing resolution of 399 ps.
Journal ArticleDOI
A Time-Resolved, Low-Noise Single-Photon Image Sensor Fabricated in Deep-Submicron CMOS Technology
M. Gersbach,Yuki Maruyama,Rahmadi Trimananda,Matthew W. Fishburn,David Stoppa,Justin Richardson,Richard Walker,Robert Henderson,Edoardo Charbon +8 more
TL;DR: The target application for this sensor is time-resolved imaging, in particular fluorescence lifetime imaging microscopy and 3D imaging, and the characterization shows the suitability of the proposed sensor technology for these applications.
Proceedings ArticleDOI
A 3×3, 5µm pitch, 3-transistor single photon avalanche diode array with integrated 11V bias generation in 90nm CMOS technology
TL;DR: A 3×3 prototype image sensor array consisting of 2µm diameter CMOS avalanche photodiodes with 3-transistor NMOS pixel circuitry is integrated in a 90nm CMOS image sensor technology.
Journal ArticleDOI
Time-domain fluorescence lifetime imaging techniques suitable for solid-state imaging sensor arrays
David Day-Uei Li,Simon Ameer-Beg,Jochen Arlt,David Tyndall,Richard Walker,Daniel R. Matthews,Daniel R. Matthews,Viput Visitkul,Justin Richardson,Robert Henderson +9 more
TL;DR: Video-rate CMOS single-photon avalanche diode (SPAD)-based cameras for fluorescence lifetime imaging microscopy (FLIM) are demonstrated by applying innovative FLIM algorithms and are capable of producing lifetime images with enough contrast.