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Photoacoustic Imaging of a Non-Targeted Contrast Agent in Breast-Tissue-Mimicking Phantoms

Our preliminary photoacoustic data indicates that we could detect small objects (tubes with a cross-section of 1mm) containing 100 micro moles of contrast agent up to about 5cm in the breast-tissue like environment. For the case of 10 micro moles concentration of the dye, we could detect such small objects up to about 3cm. This depth can be increased further (by at least another 2cm) by the use of a stronger contrast agents that are better suited for photoacoustic applications, more suitable ultrasound transducers as well as larger objects.