Measurements of wavelength shifting (WLS) fibre readout for a highly multiplexed, depth-encoding PET detector

Huini Du, Yongfeng Yang, Simon R Cherry

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We are attempting to develop a laboratory PET scanner for mouse imaging that utilizes far fewer detectors and channels of electronics, thus reducing cost, whilst retaining state-of-the-art performance. The detectors are based on LSO arrays read out by wavelength shifting (WLS) fibres placed on the top and the bottom of the arrays. Depth of interaction information will be obtained from the ratio of the signals at either end of the array. For acceptable performance, it is critical to maximize collection of light photons from the ends of the fibres and to minimize the optical crosstalk between adjacent fibres. Factors which can affect the light collection and crosstalk were studied, including coupling materials between fibres and crystals, reflectors wrapped around the fibre sides and ends, fibre size and shape, and number of layers of fibre cladding. Properties of WLS fibres such as the transmission attenuation and transverse absorption were also studied. The light yield from 2 × 2 × 10 mm3 LSO crystals collected from the end of a 2 × 2 × 30 mm3 WLS fibre was up to 24% (typical values 16-20%) of that obtained by direct coupling of the LSO crystal. This light collection efficiency appears to be sufficient for decoding interaction position in these detectors.

Original languageEnglish (US)
Article number011
Pages (from-to)2499-2514
Number of pages16
JournalPhysics in Medicine and Biology
Issue number9
StatePublished - May 7 2007

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physics and Astronomy (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology


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