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Related Experiment Video

Updated: Jun 10, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Data acquisition electronics for gamma ray emission tomography using width-modulated leading-edge discriminators.

E Lage¹, G Tapias, J Villena

¹Unidad de Medicina y Cirugía Experimental, Hospital General Universitario Gregorio Marañón. Madrid, Spain.

Physics in Medicine and Biology

|July 22, 2010

Summary

We developed a low-cost, high-performance radiation detection system using charge-integrating ADCs and a novel WMLET trigger technique. This system achieves high data rates and excellent timing resolution for PET/SPECT imaging.

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Area of Science:

Nuclear Instrumentation
Medical Imaging Technology
Radiation Detection Systems

Background:

Developing efficient radiation detection acquisition systems is crucial for medical imaging modalities like PET/SPECT.
Existing systems often face limitations in cost, performance, or complexity.

Purpose of the Study:

To present a novel, high-performance, and low-cost approach for radiation detection acquisition systems.
To demonstrate the feasibility of this approach through a 32-channel hybrid PET/SPECT system.

Main Methods:

Utilized charge-integrating ADCs and a hardware definition language (HDL) library.
Implemented a new trigger technique named WMLET (width-modulated leading-edge timing) for time pickoff and coincidence detection.
Developed and tested a 32-channel hybrid PET/SPECT demonstrator with specialized modules for signal generation, digitization, and data transmission.

Main Results:

The system demonstrated high data handling capabilities, exceeding 600k events/s for 32-channel acquisition.
Achieved excellent ADC channel linearity (>98.5%) for energy quantification.
Exhibited timing resolutions in PET mode ranging from 3.64 ns to 7.88 ns FWHM with LYSO detectors.

Conclusions:

The presented approach offers a high-performance and cost-effective solution for radiation detection acquisition.
The developed system is suitable for hybrid PET/SPECT imaging, showing good energy and timing resolutions.
The WMLET technique and HDL-based components provide a versatile platform for various acquisition tasks.