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由于滤波反投影重建算法要求对成像区域进行全方位扫描以获取完全投影数据,它需要较长时间采集大量数据,使其在医学上的应用受到限制。研究了在有限角度下采用代数重建算法进行光声成像的方法,实验用的光源为YAG激光器,波长为1064nm,重复频率20Hz,脉宽为6ns,探测器为针状的磺化聚二氟乙烯(PVDF)膜水听器,接收面积的直径为1mm,从仿真和实验结果表明该方法适用于“非完备投影数据”的光声层析成像。从图像重建效果上与滤波反投影算法相比较,该成像算法提高了重建图像的分辨率和对比度。采用代数重建算法的有限角度的光声成像方法,对临床医学的无损伤检测,具有重要的意义。
Since the filtered back-projection reconstruction algorithm requires full scanning of the imaging area for full projection data, it takes a long time to collect a large amount of data, which limits its application in medicine. The method of photoacoustic imaging using algebraic reconstruction algorithm under limited angle was studied. The experimental light source was a YAG laser with a wavelength of 1064nm, a repetition frequency of 20Hz and a pulse width of 6ns. The detector was acicular sulfonated polyvinylidene fluoride (PVDF) hydrophone, the receiving area is 1mm in diameter. The simulation and experimental results show that this method is suitable for photoacoustic tomography of “incomplete projection data”. Compared with the filtering backprojection algorithm, the imaging algorithm improves the resolution and contrast of the reconstructed image. The use of algebraic reconstruction algorithm of the limited angle of the photoacoustic imaging method for clinical non-destructive testing, is of great significance.