New-generation small animal positron emission tomography system for molecular imaging

Shiva Abbaszadeh; Craig S. Levin

doi:10.1117/1.JMI.4.1.011008

12 January 2017 New-generation small animal positron emission tomography system for molecular imaging

Shiva Abbaszadeh, Craig S. Levin

Author Affiliations +

Journal of Medical Imaging, Vol. 4, Issue 1, 011008 (January 2017). https://doi.org/10.1117/1.JMI.4.1.011008

Abstract

The next generation of discoveries in molecular imaging requires positron emission tomography (PET) systems with high spatial resolution and high sensitivity to visualize and quantify low concentrations of molecular probes. The goal of this work is to assemble and explore such a system. We use cadmium zinc telluride (CZT) to achieve high spatial resolution, three-dimensional interaction positioning, and excellent energy resolution. The CZT crystals are arranged in an edge-on configuration with a minimum gap of 50 μm in a four-sided panel geometry to achieve superior photon sensitivity. The developed CZT detectors and readout electronics were scaled up to complete significant portions of the final PET system. The steering electrode bias and the amplitude of the analog signals for time measurement were optimized to improve performance. The energy resolution (at 511 keV) over 468 channels is 7.43±1.02% full-width-at-half-maximum (FWHM). The spatial resolution is 0.76±0.1 mm FWHM. The time resolution of six CZT crystals in coincidence with six other CZT crystals is 37 ns. With high energy and spatial resolution and the relatively low random rate for small animal imaging, this system shows promise to be very useful for molecular imaging studies.

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Shiva Abbaszadeh and Craig S. Levin "New-generation small animal positron emission tomography system for molecular imaging," Journal of Medical Imaging 4(1), 011008 (12 January 2017). https://doi.org/10.1117/1.JMI.4.1.011008

Received: 30 July 2016; Accepted: 27 December 2016; Published: 12 January 2017

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KEYWORDS

Crystals

Imaging systems

Positron emission tomography

Sensors

Spatial resolution

Electrodes

Molecular imaging

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