FIGURE
5 (a) The initial pressure and sensor distribution in k-wave
simulation. (b) The reconstructed PA image using interpolated data,
without adding noise. (c) The reconstructed PA image using interpolated
data, with 18 dB added noise. (d) The de-noised imaging results by
Butterworth low pass filter. (e) The de-noised imaging results by
sqtwolog threshold WTD method. (f) The de-noised imaging results by our
proposed method (gaWD). (g) Quantitative comparison of PSNR of (c)-(f).
(h) Quantitative comparison of SSIM of (c)-(f).
We
set FIGURE 5 (b) as our reference image. The calculated PSNR
for comparison is shown in FIGURE 5 (g). Similarly, the
calculated SSIM of (c)-(f) is shown in FIGURE 5 (h).
From FIGURE 5 (g)-(h), we can find that our proposed gaWD method
exhibits the highest PSNR and SSIM among all these methods.
5 | EXPERIMENTAL RESULTS
5.1 | Experimental
system setup