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This paper presents an adaptive synthetic-focusing scheme for improving the quality of high-frequency ultrasound (HFU) and photoacoustic (PA) images acquired using a 40-MHz, 5-element, annular-array transducer. A 532-nm laser beam was coaxially delivered through an 800-µm hole in the central element of the array. The assembly was raster-scanned to acquire co-registered, 3D HFU and PA image data. Two...
The spatial resolution of high-frequency ultrasound (HFU, >20 MHz) imaging systems is usually determined using wires perpendicular to the beam. Recently, a tissue-mimicking phantom (TMP) was developed to estimate resolution in three dimensions (3D). The TMP consisted of eight slabs of anechoic spheres with diameters increasing from 0.1 to 1.09 mm. The ability of a HFU system to detect these spheres...
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