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Published on 19 April 2023

Sensitive multi-isotope gamma-ray imaging detection module at low-cost

   What is HiSPECT?

HiSPECT, CEA-Leti's technology for a gamma-ray imaging detection module, offers improved spatial and energy resolution. This four-side-buttable 40×40×6 mm3 CdZnTebased module leverages electronic signal processing on existing components for low-cost manufacturing.

Main feature:

  • Room-temperature operation from 10 keV to 1.4 MeV
  • High spectral resolution: 2% FWHM at 122 keV with a low-noise multi-channel IC (CEA-Irfu),
  • High sensitivity: depth-of-interaction, induction and charge sharing correction embedded in a field programmable gate array (FPGA)
  • High spatial resolution: 300 μm with a sub-pixel positioning signal processing on a standard CZT geometry with a 2.5 mm pixel pitch addressed by 256 readout electronic channels embedded in a FPGA.


This detection module enables multi-isotope imaging and different gamma-ray imaging techniques such as the collimator oversampling technique to improve sensitivity. CEA-Leti's detection module supports various new applications in:

  • Nuclear medicine, nuclear energy, environment, homeland and airport security, scientific applications

   What's new?

The compactness HiSPECT gamma-ray imaging detector module enables the use of highly sensitive collimators for up to a 10x gain in system sensitivity, leading to a significant reduction of medical scan time while producing the same image quality compared to current existing solutions. HiSPECT also opens possibilities in simultaneous multi-isotope imaging.

  What's next?

CEA-Leti works with gamma-ray system manufacturers to build prototyping capability, taking into account the systems' mass-production constraints. The institute offers fast technology transfers and reduced time to market with a clear patent policy.


 9 patents


 Advancements in Nuclear Instrumentation Measurement Methods and their Applications, April 2015, Lisbon

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