Conveners
A13.04 Photoacoustic Imaging and Spectroscopy: S093
- Robert Nuster (University of Graz)
- Nico F. Declercq (GeorgiaTech-CNRS IRL2958, Georgia Tech-Europe)
- Gรผnther Paltauf (University of Graz)
- Jan Laufer (Martin Luther University Halle)
- Ben T Cox (University College London)
A13.04 Photoacoustic Imaging and Spectroscopy: P497
- Ben T Cox (University College London)
- Gรผnther Paltauf (University of Graz)
- Robert Nuster (University of Graz)
- Nico F. Declercq (GeorgiaTech-CNRS IRL2958, Georgia Tech-Europe)
- Jan Laufer (Martin Luther University Halle)
A13.04 Photoacoustic Imaging and Spectroscopy: S506
- Nico F. Declercq (GeorgiaTech-CNRS IRL2958, Georgia Tech-Europe)
- Jan Laufer (Martin Luther University Halle)
- Robert Nuster (University of Graz)
- Gรผnther Paltauf (University of Graz)
- Ben T Cox (University College London)
A13.04 Photoacoustic Imaging and Spectroscopy: S349
- Ben T Cox (University College London)
- Gรผnther Paltauf (University of Graz)
- Robert Nuster (University of Graz)
- Jan Laufer (Martin Luther University Halle)
- Nico F. Declercq (GeorgiaTech-CNRS IRL2958, Georgia Tech-Europe)
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Ratan K Saha (IIIT Allahabad)10/09/2026, 08:40A13 Physical Acoustics and Ultrasound
Overall photoacoustic (PA) wave field in blood is strongly influenced by acoustic scattering arising from spatial distribution and acoustic properties of red blood cells (RBCs). In this study, the effect of multiple scattering of acoustic waves in blood with 30% hematocrit is numerically investigated using the convergent Born series (CBS) method. The simulation result is compared with that of...
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Vipul Gujrati (Institute of Biological and Medical Imaging)10/09/2026, 09:00A13 Physical Acoustics and Ultrasound
Near-infrared (NIR) optoacoustic (OptA) contrast agents are still dominated by synthetic organic and inorganic materials. Although these agents can generate strong signals, their broader preclinical and clinical use is often limited by concerns over toxicity, poor biocompatibility, and high manufacturing cost. Extracellular vesicles (EVs) offer a promising alternative because they are...
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Janek Grรถhl (University Hospital RWTH Aachen)10/09/2026, 09:00A13 Physical Acoustics and Ultrasound
The acoustic inverse problem in photoacoustic (PA) imaging is ill-posed under typical measurement configurations. We propose a hard-constrained physics-embedded neural network that directly embeds a universal backprojection module without learnable weights, surrounded by a learnable FFT filter and a learnable U-Net projection-combination module. This design enables quantitatively accurate...
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Gรผnther Paltauf (University of Graz)10/09/2026, 09:00A13 Physical Acoustics and Ultrasound
Photoacoustic microscopy with optical resolution (OR-PAM) is a method that uses optical absorption contrast for generating microscopic images of mainly biological samples. The resolution is given by the focus dimensions of an optical objective, through which a pulsed laser illuminates a sample. Local heating in the focal volume gives rise to ultrasound transients, which are detected with a...
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Markus Haltmeier (University of Innsbruck)10/09/2026, 09:20A13 Physical Acoustics and Ultrasound
Noisier2Inverse is a self-supervised framework for solving linear inverse problems without ground-truth data. Given noisy measurements Y = AX + N with forward map A : R^n -> R^m, a reconstruction network of the form B : R^m -> R^n is trained by minimizing the surrogate risk E||AB(Y+M)-(Y-M)||^2, and B(Y+M) or B(Y) is used for inference. The theoretical foundation is a surrogate risk...
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4225. Self-Supervised Reconstruction of Masked Full-Field Photoacoustic Projection Data (FA2026/947)Markus Haltmeier (University of Innsbruck)10/09/2026, 09:40A13 Physical Acoustics and Ultrasound
In camera-based full-field detection photoacoustic tomography, snapshots of the acoustic pressure field are recorded with an optical camera, yielding two-dimensional projections of the wave pattern at a fixed time after excitation. For a constant speed of sound, the initial pressure projection can be recovered exactly via a Radon-domain backpropagation method: the Radon transform decomposes...
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Teemu Sahlstrรถm (University of Eastern Finland)10/09/2026, 10:00A13 Physical Acoustics and Ultrasound
Quantitative thermoacoustic tomography (QTAT) is a medical and biomedical imaging technique combining electromagnetic contrast and high resolution of ultrasound imaging. In QTAT, a short micro- or radio wave pulse is directed to the imaged target. As the electromagnetic waves propagate in the target tissue, they are absorbed leading to localized thermal expansion and rise in pressure. This...
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Thomas Kirchner (Martin Luther University Halle)10/09/2026, 10:40A13 Physical Acoustics and Ultrasound
Photoacoustic (PA) imaging combines optical absorption contrast with the high imaging depth of ultrasonic techniques. It has been well established for the investigation of biological tissue at shallow (millimeters) depths. Imaging multi-centimeter depths in heterogeneous tissue is more challenging. For example, strong ultrasonic attenuation in bone tissue hinders applications such as human...
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Jan Sievers (Martin Luther University Halle-Wittenberg, Institute of Physics)10/09/2026, 11:00A13 Physical Acoustics and Ultrasound
FabryโPerot tomographs have produced striking photoacoustic images, as they combine very small detection elements with high acoustic sensitivity and a wideband frequency response. We recently introduced a camera-based tomograph that incorporates a Fabry-Perot sensor with uniform optical thickness, a collimated, expanded green interrogation beam, and a high-speed intensified sCMOS camera. This...
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Isobel Henderson (University of Birmingham)10/09/2026, 11:20A13 Physical Acoustics and Ultrasound
Photoacoustic imaging (PAI) is a rapidly advancing biomedical imaging technique in which pulsed light is used to excite ultrasound waves inside living tissue. To enable high-fidelity PAI systems, ultrasound sensors should provide high sensitivity, small element size, and broad bandwidth. A suitable choice is a Fabry-Perot ultrasound sensor (FPUS), an optical cavity with an ultrasonically...
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Eno Hysi (University of Toronto)10/09/2026, 14:40A13 Physical Acoustics and Ultrasound
Donor-derived graft fibrosis and ischemia reperfusion injury (IRI) remain a major determinant of transplant outcomes, yet perioperative tools provide limited real-time information on graft fibrosis, oxygenation, and response to emerging organ-repair therapies. One such therapy is mitochondrial transplantation (MTx) which delivers autologous mitochondria to injured grafts to restore...
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Lea Steigemann (Martin-Luther-Universitรคt Halle-Witten)10/09/2026, 15:00A13 Physical Acoustics and Ultrasound
Optical resolution photoacoustic microscopy (OR-PAM) is a powerful technology for high-resolution imaging of biological tissues. The integration of optical ultrasound detectors enables highly sensitive and broadband detection of photoacoustic waves up to the high-frequency range (>100 MHz), while maintaining a small detector size. This facilitates high axial and lateral resolution. This work...
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Robert Nuster (University of Graz)10/09/2026, 15:20A13 Physical Acoustics and Ultrasound
Photoacoustic microscopy is an imaging technique mainly applied to biological tissue, using short laser pulses to excite acoustic signals in optically absorbing structures. The standard approach in photoacoustic microscopy is the time-resolved detection of the generated sound waves using a single-element ultrasound detector. This has the advantage that, ideally, these sensors are acoustically...
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Amy Yijie Zheng (University of Cambridge)10/09/2026, 15:40A13 Physical Acoustics and Ultrasound
Photoacoustic imaging (PAI) is a promising non-invasive technique for clinical diagnostics, combining optical contrast with ultrasound resolution to visualise functional tissue properties. However, melanin absorption in the epidermis introduces significant effects in photoacoustic measurements, leading to spectral distortion and image artefacts. These effects impair the accuracy of key...
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