Attenuation correction single-photon emission computed tomography myocardial perfusion imaging.

Area of Science:

• Nuclear Cardiology
• Medical Imaging Physics

Background:

• Single-photon emission computed tomography (SPECT) myocardial perfusion imaging is crucial for diagnosing coronary artery disease (CAD) and guiding therapy.
• Technical limitations, particularly soft-tissue attenuation, impair the accuracy of SPECT imaging.
• Previous indirect compensation methods have limitations.

Purpose of the Study:

• To review the optimal application of newly available direct attenuation correction (AC) solutions for SPECT myocardial perfusion imaging.
• To highlight the importance of understanding system-specific technical details, quality control, and transmission map quality for effective AC.
• To discuss challenges associated with dedicated SPECT and SPECT/computed tomography (CT) systems.

Main Methods:

• Review of recent clinical literature on attenuation correction in SPECT myocardial perfusion imaging.
• Discussion of hardware and software solutions for direct attenuation correction.
• Analysis of factors influencing optimal AC application, including quality control and system-specific challenges.

Main Results:

• Direct attenuation correction solutions are now widely available and validated.
• Optimal use requires understanding system variations, quality control, and transmission map quality.
• Dedicated SPECT and SPECT/CT systems present unique challenges for attenuation correction.

Conclusions:

• Direct attenuation correction significantly enhances the diagnostic accuracy and clinical utility of SPECT myocardial perfusion imaging.
• Proper implementation and understanding of AC techniques are essential for maximizing benefits.
• Ongoing research is expanding knowledge on diagnostic accuracy, quantitative analysis, and clinical value, including risk stratification.