Results obtained using a 61-pixel Hybrid Photodiode scintillation camera

C. P. Datema, L. J. Meng, D. Ramsden

Research output: Contribution to journalArticlepeer-review


In this paper, the performance characteristics of a small prototype gamma-camera system based on the use of the recently developed Multi-pixel Hybrid Photodiode (M-HPD) are described. A compact read-out system has been developed to record the signals from all 61 pixels in the device. Single photo-electrons can be detected in each pixel. This provides an excellent means for calibrating the signal detected in each pixel in terms of the number of photo-electrons. The position-resolution of the detector has been measured as a function of the number of photo-electrons by using a finely collimated beam of light. The spatial resolution (FWHM) was measured to be 0.5 mm for a signal level of 100 photo-electrons. The M-HPD has also been used in a miniature Anger-camera system to locate the position of interaction of gamma-ray photons in a scintillator. The light-pool generated by each event in a continuous scintillation crystal is spread in the 2mm thick entrance window of the M-HPD so that the photo-electron cloud is detected by a small cluster of anode pixels. The light-spread information has been measured and is compared with optical Monte Carlo simulations.

Original languageEnglish (US)
Pages (from-to)656-660
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
StatePublished - 1999
Externally publishedYes


  • Anger Camera and Monte Carlo simulations
  • Gamma-Camera system
  • Multi-pixel Hybrid Photodiode
  • Scintillation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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