Abstract
A piezoelectric detection system consisting of an annular array is investigated for large depth of field photoacoustic imaging. In comparison to a single ring detection system, X-shaped imaging artifacts are suppressed. Sensitivity and image resolution studies are performed in simulations and in experiments and compared to a simulated spherical detector. In experiment an eight ring detection systems offers an extended depth of field over a range of 16 mm with almost constant lateral resolution.
Highlights
Photoacoustic imaging is based on the excitation of ultrasound waves by absorption of short laser pulses
To achieve an even higher suppression of artifacts and to amplify signals excited on the detector axis, we propose in this work the use of an array of several concentric ring detectors that simultaneously record waves coming from photoacoustic excitation in an object
To demonstrate the large depth of field the annular array is compared with a spherical detector in simulations
Summary
Photoacoustic imaging is based on the excitation of ultrasound waves by absorption of short laser pulses. Acquisition of PA images with a scanning, focused detector is a vital field of ongoing research [4]. To achieve a larger depth of field various transducer geometries that focus onto their symmetry axis rather than on a point have been recently investigated. When images are taken by scanning a single ring or conical axicon transducer across an object, severe imaging artifacts are created. To achieve an even higher suppression of artifacts and to amplify signals excited on the detector axis, we propose in this work the use of an array of several concentric ring detectors that simultaneously record waves coming from photoacoustic excitation in an object. Sensitivity and depth of field depend on widths and diameters of the used concentric ring elements. We show an experiment to demonstrate the depth of field of this device
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