Comparison of phase analysis with factor analysis in equilibrium gated radionuclide angiography

Area of Science:

• Cardiology
• Medical Imaging
• Diagnostic Techniques

Background:

• Regional wall motion abnormalities (RWMA) are critical indicators of cardiac health.
• Accurate diagnosis of RWMA is essential for managing conditions like coronary artery disease (CAD).
• Advanced imaging analysis techniques are continuously being evaluated for improved diagnostic performance.

Purpose of the Study:

• To intercompare the diagnostic efficacy of Phase Analysis (PA), Factor Analysis of Dynamic Structures (FADS), and Karhunen-Loeve Analysis (KLA) for detecting RWMA.
• To evaluate the performance of whole-image versus left ventricle region-of-interest (LV ROI) analyses for FADS and KLA.
• To assess the diagnostic value of novel numeric parameters (P1, P2) derived from LV-FADS.

Main Methods:

• 128 patients with suspected or proven CAD underwent X-ray angiography and radionuclide equilibrium angiography.
• PA, FADS, and KLA were applied to analyze regional wall motion.
• FADS and KLA were performed on both whole images (WI) and LV ROI.
• Receiver Operating Characteristic (ROC) curves were generated, with X-ray angiography as the gold standard.

Main Results:

• Phase Analysis (PA) achieved the highest Area Under the Curve (AUC) at 0.90.
• LV-FADS and LV-KLA showed comparable AUCs (0.86), outperforming their whole-image counterparts (WI-FADS: 0.84, WI-KLA: 0.83).
• The numeric parameters P1 and P2 derived from LV-FADS exhibited poor diagnostic value (AUCs 0.65 and 0.72, respectively).

Conclusions:

• Phase Analysis (PA) demonstrates superior diagnostic performance for RWMA compared to FADS and KLA.
• Analyzing the LV ROI for FADS and KLA offers improved diagnostic accuracy over whole-image analysis.
• The proposed numeric parameters (P1, P2) for LV-FADS lack significant diagnostic utility.