Performance evaluation of the eXplore speCZT preclinical imaging system.

Area of Science:

• Preclinical Imaging
• Nuclear Medicine
• Medical Physics

Background:

• The eXplore speCZT is a novel cadmium zinc telluride (CZT)-based preclinical single-photon emission computed tomography (SPECT) system.
• It features a stationary detector design with interchangeable rotating collimators for versatile imaging applications.

Purpose of the Study:

• To evaluate the performance of the eXplore speCZT system.
• To assess image quality using various collimators and a National Electrical Manufacturers Association (NEMA) NU-4 phantom.
• To evaluate in vivo mouse bone imaging capabilities.

Main Methods:

• Measurements included energy resolution, sensitivity, and spatial resolution using technetium-99m (99mTc) sources.
• Image quality was assessed with a NEMA NU-4 phantom and in vivo mouse studies.
• Four collimators were tested: mouse 7-pinhole (PH), mouse 8-slit (SL), rat 5-pinhole (PH), and rat 5-slit (SL).

Main Results:

• The system achieved 5.5% energy resolution (FWHM) at 140 keV with 99mTc.
• Near-millimeter transaxial and axial spatial resolution was achieved with the mouse PH collimator without resolution recovery.
• Resolution recovery significantly improved spatial resolution, achieving sub-millimeter resolution (0.71 mm FWHM) with the mouse PH collimator.
• Slit collimators generally showed better uniformity than pinhole collimators, further improved by resolution recovery.
• Acceptable quality in vivo mouse bone images were obtained using the mouse PH collimator with resolution recovery.

Conclusions:

• The eXplore speCZT system demonstrates strong performance characteristics for preclinical SPECT imaging.
• Its ability to achieve high spatial resolution and image quality makes it a valuable tool for small-animal research.
• The system is well-suited for various preclinical imaging-based research applications.