Wide-beam reconstruction half-time SPECT improves diagnostic certainty and preserves normalcy and accuracy: a...

Area of Science:

• Nuclear Medicine
• Cardiovascular Imaging
• Medical Physics

Background:

• Filtered back-projection (FBP) is a standard SPECT imaging technique.
• Iterative reconstruction algorithms, including Wide-beam reconstruction (WBR) with resolution recovery (RR) and adaptive noise control, offer improved image quality and reduced acquisition times.
• WBR incorporates adaptive noise control and resolution recovery for enhanced SPECT imaging.

Purpose of the Study:

• To prospectively evaluate the impact of WBR half-time SPECT on diagnostic certainty, accuracy, and normalcy.
• To compare WBR SPECT with full-time FBP SPECT using quantitative perfusion analysis.
• To assess the effectiveness of WBR in improving SPECT imaging outcomes.

Main Methods:

• 434 patients underwent rest (201Tl) and stress (99mTc-sestamibi) SPECT, with full-time FBP followed by half-time WBR.
• Diagnostic certainty was assessed using summed stress scores (SSS) and a 17-segment model.
• Myocardial perfusion defects were quantified as a percentage of total myocardium (%LV) and analyzed for changes (Δ%LV) between FBP and WBR.

Main Results:

• WBR significantly reduced equivocal scans (38 vs. 151 FBP, P < .0001).
• Most discordant scans shifted from equivocal FBP to normal WBR (123/151).
• No significant differences in sensitivity, specificity, or accuracy were observed between FBP and WBR, though WBR showed a higher normalcy rate (91.4% overall).

Conclusions:

• WBR with adaptive noise control enhances myocardial uniformity compared to FBP.
• WBR improves diagnostic certainty in SPECT imaging while preserving normalcy and accuracy.
• Half-time WBR SPECT offers a more definitive assessment of myocardial perfusion.