Elevation resolution enhancement in 3D photoacoustic imaging using FDMAS beamforming

Abstract

Abstract-Photoacoustic imaging is a non-invasive and nonionizing imaging technique that combines the spectral selectivity of laser excitation with the high resolution of ultrasound imaging. It is possible to identity the vascular structure of the cancerous tissue using this imaging modality. However, elevation and lateral resolution of photoacoustic imaging is usually poor for imaging target. In this study, three dimension filter delay multiply and sum beamforming technique (FDMAS(3D)) is used to improve the resolution and enhance the signal to noise ratio (SNR) of the 3D photoacoustic image that is created by using linear array transducer. This beamforming technique showed improvement in the elevation by 36% when its compared with three dimension delay and sum beamforming technique (DAS(3D)). In addition, it enhanced the SNR by 13 dB compared with DAS (3D).

Review of methods to improve the performance of linear array-based photoacoustic tomography

“…Alshaya et al reported another algorithm named the 36 Filter Delay Multiply and Sum (FDMAS) beamforming technique, which is an adaptive beamforming technique that depends on the autocorrelation between delayed radio frequency (RF) data. Due to the autocorrelation operation, the FDMAS beamforming technique cannot be applied directly in 3D PAI.…”

“…Liu et al designed and built a handheld, real-time PAI system with manually adjustable side light delivery. 41 To optimize the laser light delivery, ā nite element simulation was employed to evaluate the in°uence of the incident angle and interval 35 One translational scan Fast No Medium FDMAS 36 One translational scan Fast No Medium between the two arms of the¯ber bundle regarding light°uence. Phantom experimental validations were performed and the results were consistent with the simulations results.…”