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A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

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Basic performance of a large area PET detector with a monolithic scintillator.

Eiji Yoshida¹, Naoko Inadama, Hiroto Osada

¹National Institute of Radiological Sciences, Chiba, Japan. rush@nirs.go.jp

Radiological Physics and Technology

|February 23, 2011

Summary

This study explores monolithic block detectors for Positron Emission Tomography (PET). Researchers found a trade-off between spatial resolution and light output due to edge effects in monolithic LYSO detectors.

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Area of Science:

Medical Imaging
Nuclear Physics

Background:

Conventional Positron Emission Tomography (PET) detectors use segmented scintillator arrays.
Monolithic block detectors offer potential for higher resolution but require sufficient thickness for 511-keV radiation stopping power.
Previous monolithic designs were primarily for small-animal PET and lacked adequate thickness.

Purpose of the Study:

To develop and evaluate a large, thick monolithic LYSO PET detector for improved performance.
To investigate the impact of reflector materials on spatial resolution and light output.
To understand the trade-offs in monolithic PET detector design.

Main Methods:

Developed a PET detector using a large, thick monolithic LYSO crystal coupled with a 64-channel, position-sensitive photomultiplier tube (PS-PMT).
Evaluated detector performance with and without reflectors on the LYSO crystal.
Measured spatial resolution and light output under different configurations.

Main Results:

With reflectors, the detector achieved 3 mm FWHM spatial resolution at the center, but it degraded significantly at the edges.
Replacing reflectors with black paper improved spatial resolution uniformity but reduced overall light output.
A clear trade-off was observed between spatial resolution and light output.

Conclusions:

Monolithic LYSO PET detectors show promise for higher resolution imaging.
Edge effects in monolithic detectors significantly impact spatial resolution and light output.
Optimizing reflector materials is crucial to balance spatial resolution and light output in monolithic PET detector design.