Small vs Large Focal Spot in Coronary CT Angiography: Phantom Study with Super-Resolution DL Reconstruction

In phantom coronary CT angiography with super-resolution DL reconstruction, small focal spot improved spatial resolution but increased noise for 16-31 cm diameters; at 36 cm, small spot reduced high-frequency noise. Optimal focal spot choice depends on patient size.

• Noise power spectrum (NPS): small focal spot produced higher noise for 16–31 cm phantoms, but less high-frequency noise at 36 cm.
• Task-based transfer function (TTF): small focal spot improved spatial resolution; the benefit diminished with larger phantoms and was negligible at 31 cm.
• The study suggests optimal focal spot selection depends on patient size in coronary CT angiography with super-resolution DL reconstruction.

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