Tomographic imaging with Compton PET modules: Ideal case and first implementation

P. Peng, M. Zhang, N. Zeraatkar, Jinyi Qi, S. R. Cherry

Research output: Contribution to journalArticlepeer-review


In our previous studies, we demonstrated that the Compton PET module, a layer structure PET detector with side readout, can provide high performance in terms of spatial/energy/timing resolution, as well as high gamma ray detection efficiency. In this study, we investigate how to translate the high performance of the detector module into good quality reconstructed tomographic images. This study is performed using GATE simulation, as well as with physical experiments. Similar detector geometry is used in the simulation and experiment: two identical 4-layer detector modules are placed with face to face distance of 56 mm. In the simulation study, each layer consists of a 1-mm-pitch pixelated crystal array. In the experimental study, each layer is a monolithic crystal, which is virtually binned into 1 mm2 cells to group single events according to the gamma ray interaction locations. A customized Derenzo phantom was placed between the two detector modules. By rotating the phantom using a motorized rotary stage, data along lines of response (LORs) at different angles were collected for reconstructing the tomographic image. The same reconstruction algorithm was used for both simulation and experimental studies. The results demonstrate that the simulation study could resolve 0.8 mm rods while the experimental study was able to resolve 1.0 mm rods.

Original languageEnglish (US)
Article numberT04007
JournalJournal of Instrumentation
Issue number4
StatePublished - Apr 2021


  • Computer-aided diagnosis
  • Coronary CT angiography (CTA)
  • Gamma camera
  • Image reconstruction in medical imaging
  • Medical-image reconstruction methods and algorithms
  • Programs
  • Simulation methods

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation


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