Correction of partial volume effects in myocardial SPECT

Area of Science:

• Medical Imaging
• Nuclear Cardiology
• Biomedical Engineering

Background:

• Partial volume effects significantly impact myocardial single photon emission computed tomographic (SPECT) studies due to limited resolution and cardiac motion.
• Existing correction techniques primarily focus on improving reconstructed resolution, with limited work on other correction methods.

Purpose of the Study:

• To quantify the extent of partial volume effects in myocardial SPECT.
• To propose and validate a novel correction method for partial volume effects using extravascular density.

Main Methods:

• Developed a correction method by estimating extravascular density from transmission and blood pool studies.
• Utilized simulations of a beating heart to assess partial volume errors and the efficacy of the extravascular density correction.
• Compared transmission and emission resolution, and addressed spillover effects for accurate correction.

Main Results:

• Simulations confirmed the importance of partial volume errors and the effectiveness of extravascular density correction.
• Demonstrated accurate correction (within 10%) for partial volume loss using extravascular density with ordered subsets expectation maximization reconstruction.
• Identified significant variations in recovery coefficients between myocardial walls and the necessity of filtering for resolution differences.

Conclusions:

• The proposed method effectively corrects partial volume effects in myocardial SPECT using extravascular density.
• Successful correction requires careful matching of both resolution and spillover between emission and extravascular density data.