Feasibility study of multi Laue lens based SPECT with a dedicated 3D reconstruction algorithm using Monte Carlo...

Area of Science:

• Biomedical Imaging
• Nuclear Medicine
• Medical Physics

Background:

• Current in-vivo imaging techniques, including Single Photon Emission Computed Tomography (SPECT), face limitations in spatial resolution, hindering early-stage tumor detection and small-animal studies.
• Traditional SPECT systems utilize absorptive collimation, creating an inherent trade-off between sensitivity and spatial resolution, which restricts the identification of small lesions and detailed examination of physiological changes.

Purpose of the Study:

• To develop a novel SPECT system with enhanced spatial resolution for small object imaging at sub-millimetre scales.
• To overcome the resolution-sensitivity trade-off inherent in conventional SPECT systems.
• To improve capabilities for detecting subtle physiological changes and tumor evolution in transgenic models for personalized medicine and early cancer diagnosis.

Main Methods:

• Implementation of a novel SPECT system utilizing X-ray and gamma-ray focusing optics, specifically an array of Laue lenses, inspired by astronomical applications.
• Development of a custom Monte Carlo simulation to model the system's spatial resolution and sensitivity.
• Utilization of a tailored 3D reconstruction algorithm designed to complement the system's unique geometry.

Main Results:

• The proposed SPECT system achieves an ultra-high spatial resolution of 0.1 mm full width at half maximum (FWHM).
• The system demonstrates a sensitivity of 1,670 counts per second per microcurie (cps/µCi).
• The design enables discrimination of adjacent volumes as small as 0.113 nL, significantly outperforming existing SPECT systems.

Conclusions:

• The novel SPECT system, employing Laue lenses, successfully achieves sub-millimetre spatial resolution without compromising sensitivity, addressing a critical limitation in current imaging technologies.
• This advancement offers superior performance compared to existing SPECT systems, paving the way for more precise preclinical studies.
• The proposed design has the potential to revolutionize SPECT imaging, significantly impacting transgenic animal research, early-stage tumor detection, and personalized medicine through enhanced diagnostic capabilities.