Development of an Ultra High Resolution PET Scanner for Imaging Rodent Paws: PawPET

Felipe Godinez, Kuang Gong, Jian Zhou, Martin S. Judenhofer, Abhijit J. Chaudhari, Ramsey D. Badawi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A positron emission tomography (PET) scanner with submillimeter spatial resolution, capable of in vivo imaging of murine extremities was built based on two dual ended readout, hybrid depth of interaction (DOI) PET detectors. Each was composed of a 36 × 36 array of 0.43 mm × 0.43 mm × 8 mm unpolished lutetium oxyorthosilicate crystals separated by a 50μ m white diffuse reflector. The array was coupled to a position-sensing photomultiplier tube at one end and to an avalanche photodiode at the other end. The detector characterization included crystal identification accuracy, DOI, energy, and timing resolution measurements. The scanner was characterized in terms of its spatial resolution and its sensitivity and mouse images were acquired of a mouse paw injected with 18-F-NaF. Out of the 36 × 36 crystals only 33 × 33 crystals were identified. The coincidence timing, DOI, and energy resolution of the scanner was measured to be 2.8 ns, 1.4 mm, and 27%, respectively. The scanner's spatial resolution was measured with a line source and determined from an ordered subsets expectation maximization reconstruction to be 0.56 mm. The sensitivity of the scanner was measured to be 0.6% at the center of the field of view.

Original languageEnglish (US)
Article number8078209
Pages (from-to)7-16
Number of pages10
JournalIEEE Transactions on Radiation and Plasma Medical Sciences
Issue number1
StatePublished - Jan 2018


  • Depth of interaction (DOI)
  • high resolution imaging
  • hybrid DOI detector
  • mouse paw imaging
  • positron emission tomography (PET) detectors
  • preclinical PET

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging
  • Instrumentation


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