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  1. Article ; Online: The power of light and sound: optoacoustic skin imaging for diabetes progression monitoring.

    Siegel, Amanda P / Avanaki, Kamran

    Light, science & applications

    2023  Volume 12, Issue 1, Page(s) 283

    Abstract: Diabetes progression is marked by damage to vascular and neural networks. Raster-scan optoacoustic mesoscopy holds the potential to measure extent of diabetes progression by analyzing changes in skin vasculature. ...

    Abstract Diabetes progression is marked by damage to vascular and neural networks. Raster-scan optoacoustic mesoscopy holds the potential to measure extent of diabetes progression by analyzing changes in skin vasculature.
    Language English
    Publishing date 2023-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2662628-7
    ISSN 2047-7538 ; 2047-7538
    ISSN (online) 2047-7538
    ISSN 2047-7538
    DOI 10.1038/s41377-023-01322-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Evaluation of 10 current image reconstruction algorithms for linear array photoacoustic imaging.

    Prakash, Ravi / Manwar, Rayyan / Avanaki, Kamran

    Journal of biophotonics

    2024  Volume 17, Issue 3, Page(s) e202300117

    Abstract: Various reconstruction algorithms have been implemented for linear array photoacoustic imaging systems with the goal of accurately reconstructing the strength absorbers within the tissue being imaged. Since the existing algorithms have been introduced by ...

    Abstract Various reconstruction algorithms have been implemented for linear array photoacoustic imaging systems with the goal of accurately reconstructing the strength absorbers within the tissue being imaged. Since the existing algorithms have been introduced by different research groups and the context of performance evaluation was not consistent, it is difficult to make a fair comparison between them. In this study, we systematically compared the performance of 10 published image reconstruction algorithms (DAS, UBP, pDAS, DMAS, MV, EIGMV, SLSC, GSC, TR, and FD) using in-vitro phantom data. Evaluations were conducted based on lateral resolution of the reconstructed images, computational time, target detectability, and noise sensitivity. We anticipate the outcome of this study will assist researchers in selecting appropriate algorithms for their linear array PA imaging applications.
    MeSH term(s) Photoacoustic Techniques/methods ; Diagnostic Imaging ; Phantoms, Imaging ; Algorithms ; Image Processing, Computer-Assisted/methods
    Language English
    Publishing date 2024-01-17
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.202300117
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    Zs.A 6723: Show issues Location:
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  3. Article ; Online: High-frequency photoacoustic and ultrasound imaging for skin evaluation: Pilot study for the assessment of a chemical burn.

    Benavides-Lara, Juliana / Siegel, Amanda P / Tsoukas, Maria M / Avanaki, Kamran

    Journal of biophotonics

    2024  , Page(s) e202300460

    Abstract: Skin architecture and its underlying vascular structure could be used to assess the health status of skin. A non-invasive, high resolution and deep imaging modality able to visualize skin subcutaneous layers and vasculature structures could be useful for ...

    Abstract Skin architecture and its underlying vascular structure could be used to assess the health status of skin. A non-invasive, high resolution and deep imaging modality able to visualize skin subcutaneous layers and vasculature structures could be useful for determining and characterizing skin disease and trauma. In this study, a multispectral high-frequency, linear array-based photoacoustic/ultrasound (PAUS) probe is developed and implemented for the imaging of rat skin in vivo. The study seeks to demonstrate the probe capabilities for visualizing the skin and its underlying structures, and for monitoring changes in skin structure and composition during a 5-day course of a chemical burn. We analayze composition of lipids, water, oxy-hemoglobin, and deoxy-hemoglobin (for determination of oxygen saturation) in the skin tissue. The study successfully demonstrated the high-frequency PAUS imaging probe was able to provide 3D images of the rat skin architecture, underlying vasculature structures, and oxygen saturation, water, lipids and total hemoglobin.
    Language English
    Publishing date 2024-05-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.202300460
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  4. Article ; Online: Bilirubin-biliverdin concentration measurement using photoacoustic spectroscopic analysis for determining hemorrhage age.

    Manwar, Rayyan / Gelovani, Juri G / Avanaki, Kamran

    Journal of biophotonics

    2023  Volume 16, Issue 7, Page(s) e202200316

    Abstract: The onset of intracerebral hemorrhage and its progression toward acute brain injury have been correlated with the concentration of unconjugated bilirubin (BR). In addition, BR has been considered a novel predictor of outcome from intracranial hemorrhage. ...

    Abstract The onset of intracerebral hemorrhage and its progression toward acute brain injury have been correlated with the concentration of unconjugated bilirubin (BR). In addition, BR has been considered a novel predictor of outcome from intracranial hemorrhage. Since the existing invasive approach for determining localized BR and biliverdin (BV) concentration within the hemorrhagic brain lesion is not feasible, the predictive capability of BR in terms of determining the onset of hemorrhage and understanding the consequences of its progression (age) is unknown. In this study, we have demonstrated a photoacoustic (PA) approach to the noninvasive measurement of BR-BV ratio that can be utilized longitudinally to approximate the onset of the hemorrhage. The PA imaging-based measurements of BV and BR in tissues and fluids can potentially be used to determine hemorrhage "age," quantitatively evaluate the hemorrhage resorption or detect a rebleeding, and assess responses to therapy and prognosis.
    MeSH term(s) Humans ; Biliverdine/chemistry ; Bilirubin/chemistry ; Spectrum Analysis ; Hemorrhage/diagnostic imaging
    Chemical Substances Biliverdine (O9MIA842K9) ; Bilirubin (RFM9X3LJ49)
    Language English
    Publishing date 2023-04-12
    Publishing country Germany
    Document type Letter ; Research Support, N.I.H., Extramural
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.202200316
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  5. Article ; Online: Quantitative Photoacoustic Tomography Using Iteratively Refined Wavefield Reconstruction Inversion: A Simulation Study.

    Ranjbaran, Seyed Mohsen / Aghamiry, Hossein S / Gholami, Ali / Operto, Stephane / Avanaki, Kamran

    IEEE transactions on medical imaging

    2024  Volume 43, Issue 2, Page(s) 874–885

    Abstract: The ultimate goal of photoacoustic tomography is to accurately map the absorption coefficient throughout the imaged tissue. Most studies either assume that acoustic properties of biological tissues such as speed of sound (SOS) and acoustic attenuation ... ...

    Abstract The ultimate goal of photoacoustic tomography is to accurately map the absorption coefficient throughout the imaged tissue. Most studies either assume that acoustic properties of biological tissues such as speed of sound (SOS) and acoustic attenuation are homogeneous or fluence is uniform throughout the entire tissue. These assumptions reduce the accuracy of estimations of derived absorption coefficients (DeACs). Our quantitative photoacoustic tomography (qPAT) method estimates DeACs using iteratively refined wavefield reconstruction inversion (IR-WRI) which incorporates the alternating direction method of multipliers to solve the cycle skipping challenge associated with full wave inversion algorithms. Our method compensates for SOS inhomogeneity, fluence decay, and acoustic attenuation. We evaluate the performance of our method on a neonatal head digital phantom.
    MeSH term(s) Image Processing, Computer-Assisted/methods ; Tomography/methods ; Tomography, X-Ray Computed ; Phantoms, Imaging ; Computer Simulation ; Photoacoustic Techniques/methods ; Algorithms
    Language English
    Publishing date 2024-02-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 622531-7
    ISSN 1558-254X ; 0278-0062
    ISSN (online) 1558-254X
    ISSN 0278-0062
    DOI 10.1109/TMI.2023.3324922
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  6. Article: Editorial: Combined EEG in research and diagnostics: Novel perspectives and improvements.

    Porcaro, Camillo / Avanaki, Kamran / Arias-Carrion, Oscar / Mørup, Morten

    Frontiers in neuroscience

    2023  Volume 17, Page(s) 1152394

    Language English
    Publishing date 2023-02-16
    Publishing country Switzerland
    Document type Editorial
    ZDB-ID 2411902-7
    ISSN 1662-453X ; 1662-4548
    ISSN (online) 1662-453X
    ISSN 1662-4548
    DOI 10.3389/fnins.2023.1152394
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  7. Article ; Online: Adaptive coherent weighted averaging algorithm for enhancement of photoacoustic tomography images of brain.

    Manwar, Rayyan / Li, Xin / Kratkiewicz, Karl / Zhu, Dongxiao / Avanaki, Kamran

    Journal of biophotonics

    2023  Volume 16, Issue 11, Page(s) e202300103

    Abstract: One common method to improve the low signal-to-noise ratio of the photoacoustic (PA) signal generated from weak absorbers or absorbers located in deep tissue is to acquire signal multiple times from the same region and perform averaging. However, pulse- ... ...

    Abstract One common method to improve the low signal-to-noise ratio of the photoacoustic (PA) signal generated from weak absorbers or absorbers located in deep tissue is to acquire signal multiple times from the same region and perform averaging. However, pulse-to-pulse laser fluctuations together with differences in the beam profile of the pulses create undeterministic multiple scattering processes in the tissue. This phenomenon consequently induces a spatiotemporal displacement in the PA signal samples which in turn deteriorates the effectiveness of signal averaging. Here, we present an adaptive coherent weighted averaging algorithm to adjust the locations and values of PA signal samples for more efficient signal averaging. The proposed method is evaluated in a linear array-based PA imaging setup of ex vivo sheep brain.
    MeSH term(s) Animals ; Sheep ; Tomography, X-Ray Computed ; Signal-To-Noise Ratio ; Phantoms, Imaging ; Algorithms ; Brain/diagnostic imaging ; Photoacoustic Techniques/methods
    Language English
    Publishing date 2023-08-30
    Publishing country Germany
    Document type Letter ; Research Support, N.I.H., Extramural
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.202300103
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  8. Article: Couplants in Acoustic Biosensing Systems.

    Manwar, Rayyan / Saint-Martin, Loїc / Avanaki, Kamran

    Chemosensors (Basel, Switzerland)

    2022  Volume 10, Issue 5, Page(s) 181

    Abstract: Acoustic biosensors are widely used in physical, chemical, and biosensing applications. One of the major concerns in acoustic biosensing is the delicacy of the medium through which acoustic waves propagate and reach acoustic sensors. Even a small airgap ... ...

    Abstract Acoustic biosensors are widely used in physical, chemical, and biosensing applications. One of the major concerns in acoustic biosensing is the delicacy of the medium through which acoustic waves propagate and reach acoustic sensors. Even a small airgap diminishes acoustic signal strengths due to high acoustic impedance mismatch. Therefore, the presence of a coupling medium to create a pathway for an efficient propagation of acoustic waves is essential. Here, we have reviewed the chemical, physical, and acoustic characteristics of various coupling material (liquid, gel-based, semi-dry, and dry) and present a guide to determine a suitable application-specific coupling medium.
    Language English
    Publishing date 2022-05-09
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2704218-2
    ISSN 2227-9040
    ISSN 2227-9040
    DOI 10.3390/chemosensors10050181
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  9. Article ; Online: High-fidelity compression for high-throughput photoacoustic microscopy systems.

    Zafar, Mohsin / Manwar, Rayyan / Avanaki, Kamran

    Journal of biophotonics

    2022  Volume 15, Issue 5, Page(s) e202100350

    Abstract: Photoacoustic microscopic images can assist specialists in disease diagnosis by providing vascular information. However, the size of such data is usually extremely large (ie, gigabytes), and thus, a real-time, efficient compression method can facilitate ... ...

    Abstract Photoacoustic microscopic images can assist specialists in disease diagnosis by providing vascular information. However, the size of such data is usually extremely large (ie, gigabytes), and thus, a real-time, efficient compression method can facilitate easy storage and transportation of these images. We have implemented multiple data compression methods in LabVIEW with a high compression ratio and execution times below the repetition rate of the pulsed laser. The qualitative and quantitative results of ex vivo and in vivo imaging with compression showed near-identical images to uncompressed images, with significantly smaller size.
    MeSH term(s) Algorithms ; Data Compression/methods ; Microscopy
    Language English
    Publishing date 2022-03-14
    Publishing country Germany
    Document type Letter ; Research Support, N.I.H., Extramural
    ZDB-ID 2390063-5
    ISSN 1864-0648 ; 1864-063X
    ISSN (online) 1864-0648
    ISSN 1864-063X
    DOI 10.1002/jbio.202100350
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  10. Article ; Online: Photoacoustic imaging for investigating tumor hypoxia: a strategic assessment.

    Nasri, Deyana / Manwar, Rayyan / Kaushik, Ajeet / Er, Ekrem Emrah / Avanaki, Kamran

    Theranostics

    2023  Volume 13, Issue 10, Page(s) 3346–3367

    Abstract: Hypoxia causes the expression of signaling molecules which regulate cell division, lead to angiogenesis, and further, in the tumor microenvironment, promote resistance to chemotherapy and radiotherapy, and induce metastasis. Photoacoustic imaging (PAI) ... ...

    Abstract Hypoxia causes the expression of signaling molecules which regulate cell division, lead to angiogenesis, and further, in the tumor microenvironment, promote resistance to chemotherapy and radiotherapy, and induce metastasis. Photoacoustic imaging (PAI) takes advantage of unique absorption characteristics of chromophores in tissues and provides the opportunity to construct images with a high degree of spatial and temporal resolution. In this review, we discuss the physiologic characteristics of tumor hypoxia, and current applications of PAI using endogenous (label free imaging) and exogenous (organic and inorganic) contrast agents. Features of various methods in terms of their efficacy for determining physiologic and proteomic phenomena are analyzed. This review demonstrates that PAI has the potential to understand tumor growth and metastasis development through measurement of regulatory molecule concentrations, oxygen gradients, and vascular distribution.
    MeSH term(s) Humans ; Photoacoustic Techniques/methods ; Proteomics ; Tumor Hypoxia ; Neoplasms/diagnostic imaging ; Optical Imaging/methods ; Tumor Microenvironment
    Language English
    Publishing date 2023-05-29
    Publishing country Australia
    Document type Journal Article ; Review
    ZDB-ID 2592097-2
    ISSN 1838-7640 ; 1838-7640
    ISSN (online) 1838-7640
    ISSN 1838-7640
    DOI 10.7150/thno.84253
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