Normal limits of gated blood pool SPECT count-based regional cardiac function parameters

Area of Science:

• Nuclear Cardiology
• Cardiac Imaging
• Ventricular Function Analysis

Background:

• Gated blood pool SPECT (GBPS) ejection fraction (EF) computations are validated imaging methods.
• GBPS enables assessment of global and regional biventricular function.
• Regional parameters show potential for cardiac resynchronization therapy planning.

Purpose of the Study:

• Establish normal limits for count-based GBPS regional left and right ventricular (LV and RV) function.
• Quantify the reproducibility of these regional parameters.
• Assess the clinical utility for detecting abnormalities in heart failure.

Main Methods:

• Fourier series fitting of count-time curves for LV and RV sub-volumes.
• Computation of global and regional EF, timing, phase, and dyssynchrony parameters.
• Application to normal controls and patients with congestive heart failure (CHF), with blinded reanalysis for reproducibility.

Main Results:

• No significant differences found between initial and reprocessed LV/RV parameters in normal subjects or CHF patients.
• Consistent categorization of subjects as abnormal between initial and reprocessed analyses.
• Significant differences observed in most parameters between CHF patients and normal controls.
• Established normal limits align with existing literature, with RV limits mirroring LV limits.

Conclusions:

• GBPS provides reproducible global and regional LV and RV normal limits.
• The technique reliably detects functional abnormalities in CHF patients.
• These reproducible normal limits enhance the clinical application of GBPS for biventricular assessment.