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Table 1 Parameters in simulations and experiments

From: Plane wave imaging combined with eigenspace-based minimum variance beamforming using a ring array in ultrasound computed tomography

Parameter Computer simulation Phantom experiment Parameter Computer simulation Phantom experiment
\(N\) 540 512 \(f_{s}\) 10 MHz 20 MHz
pitch 1.15 mm Excitation signal Sine (2 cycles) Square (2 cycles)
kerf 0.2 mm \(N^{\prime}\) 32, 64,…
\(R\) 99 mm \(L\) \(N^{\prime}/4\)
\(\Delta \theta\) 0.67° Diagonal loading \({\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 {100 *L}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${100 *L}$}}\)
\(M\) 68 58/50 Eigenvalue (signal) \(\lambda_{i} > 0.05*\lambda_{max}\)
\(f_{c}\) 1 MHz Eigenvalue (noise) \(\lambda_{i} < 0.05*\lambda_{max}\)