Imaging small inhomogeneities by time-resolved laser transmittance measurements using different reconstruction procedures

摘要

The possibility of obtaining images of human organs by optical techniques for diagnostic purposes is still under intense investigation. Useful information for devising the most efficient data acquisition procedures and reconstruction algorithms can be obtained by imaging well-controlled small inhomogeneities using different reconstruction procedures. For this purpose we performed time-resolved imaging experiments by embedding in a turbid slab small inclusions with different absorption coefficients. The ability of the imaging system to detect these hidden objects strongly depends on its optical properties and on the method that is adopted to reconstruct images. To this regard, in order to construct images different procedures can be adopted. The efficiency of these different procedures has been valuated by investigating the contrast, the noise and the effective signal-to-noise ratio of constructed images. Furthermore, this data analysis has been used to study the role of the inclusion's object contrast on the efficiency of the adopted reconstruction algorithm.