Efficient nonlinear beamformer based on P'th root of detected signals for linear-array photoacoustic tomography: application to sentinel lymph node imaging.
Moein Mozaffarzadeh,Moein Mozaffarzadeh,Vijitha Periyasamy,Manojit Pramanik,Bahador Makkiabadi,Bahador Makkiabadi +5 more
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TLDR
A nonlinear (NL) beamformer for linear-array PA imaging, which uses the p’th root of the detected signals and imposes the complexity of DAS, shows that the NL algorithm, using a root of p (NL_p), leads to lower sidelobes and higher signal-to-noise ratio compared with DAS and DMAS.Abstract:
In linear-array transducer-based photoacoustic (PA) imaging, B-scan PA images are formed using the raw channel PA signals. Delay-and-sum (DAS) is the most prevalent algorithm due to its simple implementation, but it leads to low-quality images. Delay-multiply-and-sum (DMAS) provides a higher image quality in comparison with DAS while it imposes a computational burden of O ( M2 ) . We introduce a nonlinear (NL) beamformer for linear-array PA imaging, which uses the p’th root of the detected signals and imposes the complexity of DAS [O ( M ) ]. The proposed algorithm is evaluated numerically and experimentally [wire-target and in-vivo sentinel lymph node (SLN) imaging], and the effects of the parameter p are investigated. The results show that the NL algorithm, using a root of p (NL_p), leads to lower sidelobes and higher signal-to-noise ratio compared with DAS and DMAS, for (p > 2). The sidelobes level (for the wire-target phantom), at the depth of 11.4 mm, are about −31, −52, −52, −67, −88, and −109 dB, for DAS, DMAS, NL_2, NL_3, NL_4, and NL_5, respectively, indicating the superiority of the NL_p algorithm. In addition, the best value of p for SLN imaging is reported to be 12.read more
Citations
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The double-stage delay-multiply-and-sum image reconstruction method improves imaging quality in a LED-based photoacoustic array scanner.
TL;DR: Double-stage delay-multiply-and-sum (DS-DMAS) is described to improve image quality collected on a LED-based scanner and indicates that it might be a valuable tool in the translation of LED- based and other low power PAI systems.
Journal ArticleDOI
Practical photoacoustic tomography: Realistic limitations and technical solutions
TL;DR: A perspective on photoacoustic tomography under realistic scenarios is offered, and the importance of working within these realistic limitations is emphasized, and researchers are encouraged to develop compensating solutions that advance PAT’s translation to real clinical environments.
Journal ArticleDOI
Eigenspace-Based Minimum Variance Combined With Delay Multiply and Sum Beamformer: Application to Linear-Array Photoacoustic Imaging
TL;DR: In this article, a novel beamformer is introduced using the eigenspace-based minimum variance (EIBMV) method combined with delay-multiply-and-sum (DMAS) algorithm.
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Signal and Image Processing in Biomedical Photoacoustic Imaging: A Review
TL;DR: Various signal and image processing techniques that have been developed/implemented in PAI are reviewed to highlight the importance of image computing in photoacoustic imaging.
Journal ArticleDOI
Technical considerations in the Verasonics research ultrasound platform for developing a photoacoustic imaging system
TL;DR: In this article, the authors have discussed the experimental considerations for linear array based PAI due to its popularity, simple setup, and high potential for clinical translatability, and described the strategies of US/PA imaging system setup, signal generation, amplification, data processing and study the system performance.
References
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TL;DR: In vivo noninvasive transdermal and transcranial imaging of the structure and function of rat brains by means of laser-induced photoacoustic tomography (PAT) is reported, which retains intrinsic optical contrast characteristics while taking advantage of the diffraction-limited high spatial resolution of ultrasound.
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A practical guide to photoacoustic tomography in the life sciences
Lihong V. Wang,Junjie Yao +1 more
TL;DR: The fundamentals of photoacoustic tomography are reviewed and practical guidelines for matching PAT systems with research needs are provided, and the most promising biomedical applications of PAT are summarized.
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The Delay Multiply and Sum Beamforming Algorithm in Ultrasound B-Mode Medical Imaging
TL;DR: Results show that the DMAS beamformer outperforms DAS in both simulated and experimental trials and that the main improvement brought about by this new method is a significantly higher contrast resolution, which turns out into an increased dynamic range and better quality of B-mode images.
Journal ArticleDOI
Single-impulse Panoramic Photoacoustic Computed Tomography of Small-animal Whole-body Dynamics at High Spatiotemporal Resolution.
Lei Li,Liren Zhu,Cheng Ma,Li Lin,Li Lin,Junjie Yao,Lidai Wang,Konstantin Maslov,Ruiying Zhang,Wanyi Chen,Junhui Shi,Lihong V. Wang +11 more
TL;DR: It is demonstrated that standalone single-impulse photoacoustic computed tomography (SIP-PACT) mitigates these limitations by combining high spatiotemporal resolution, deep penetration, anatomical, dynamical and functional contrasts, and full-view fidelity.