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Roll W, Markwardt NA, Masthoff M, Helfen A, Claussen J, Eisenblätter M, Hasenbach A, Hermann S, Karlas A, Wildgruber M, Ntziachristos V, Schäfers M. Multispectral Optoacoustic Tomography of Benign and Malignant Thyroid Disorders: A Pilot Study. J Nucl Med 2019; 60:1461-1466. [PMID: 30850507 DOI: 10.2967/jnumed.118.222174] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 02/26/2019] [Indexed: 12/27/2022] Open
Abstract
This study aimed at evaluating hybrid multispectral optoacoustic tomography/ultrasound for imaging of thyroid disorders, including Graves' disease and thyroid nodules. Methods: The functional biomarkers and tissue parameters deoxygenated hemoglobin, oxygenated hemoglobin, total hemoglobin, saturation of hemoglobin, fat content, and water content were analyzed in thyroid lobes affected by Graves' disease (n = 6), thyroid lobes with healthy tissue (n = 8), benign thyroid nodules (n = 13), and malignant thyroid nodules (n = 3). Results: In Graves' disease, significantly higher deoxygenated hemoglobin (3.18 ± 0.52 vs. 2.13 ± 0.62; P = 0.0055) and total hemoglobin (8.34 ± 0.88 vs. 6.59 ± 1.16; P = 0.0084) and significantly lower fat content (0.64 ± 0.37 vs. 1.69 ± 1.25; P = 0.0293) were found than in healthy controls. Malignant thyroid nodules showed significantly lower saturation of hemoglobin (55.4% ± 2.6% vs. 60.8% ± 7.2%; P = 0.0393) and lower fat content (0.62 ± 0.19 vs. 1.46 ± 0.87; P = 0.1295) than benign nodules. Conclusion: This pilot study showed the applicability and the potential of hybrid multispectral optoacoustic tomography/ultrasound to semiquantitatively provide tissue characterization and functional parameters in thyroid disorders for improved noninvasive diagnostics of thyroid diseases.
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Affiliation(s)
- Wolfgang Roll
- Department of Nuclear Medicine, University Hospital Münster, Münster, Germany
| | - Niklas A Markwardt
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, München, Germany.,Chair of Biological Imaging and TranslaTUM, Technische Universität München, München, Germany
| | - Max Masthoff
- Institute of Clinical Radiology, University Hospital Münster, Münster, Germany
| | - Anne Helfen
- Institute of Clinical Radiology, University Hospital Münster, Münster, Germany
| | | | - Michel Eisenblätter
- Institute of Clinical Radiology, University Hospital Münster, Münster, Germany.,Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom
| | - Alexa Hasenbach
- European Institute for Molecular Imaging, University of Münster, Münster, Germany; and
| | - Sven Hermann
- European Institute for Molecular Imaging, University of Münster, Münster, Germany; and
| | - Angelos Karlas
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, München, Germany.,Chair of Biological Imaging and TranslaTUM, Technische Universität München, München, Germany
| | - Moritz Wildgruber
- Institute of Clinical Radiology, University Hospital Münster, Münster, Germany.,Cells in Motion (CiM) Cluster of Excellence, University of Münster, Münster, Germany
| | - Vasilis Ntziachristos
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, München, Germany.,Chair of Biological Imaging and TranslaTUM, Technische Universität München, München, Germany
| | - Michael Schäfers
- Department of Nuclear Medicine, University Hospital Münster, Münster, Germany.,European Institute for Molecular Imaging, University of Münster, Münster, Germany; and.,Cells in Motion (CiM) Cluster of Excellence, University of Münster, Münster, Germany
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Francis KJ, Chinni B, Channappayya SS, Pachamuthu R, Dogra VS, Rao N. Multiview spatial compounding using lens-based photoacoustic imaging system. PHOTOACOUSTICS 2019; 13:85-94. [PMID: 30949434 PMCID: PMC6430722 DOI: 10.1016/j.pacs.2019.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 12/18/2018] [Accepted: 01/09/2019] [Indexed: 05/07/2023]
Abstract
Recently, an acoustic lens has been proposed for volumetric focusing as an alternative to conventional reconstruction algorithms in Photoacoustic (PA) Imaging. Acoustic lens can significantly reduce computational complexity and facilitate the implementation of real-time and cost-effective systems. However, due to the fixed focal length of the lens, the Point Spread Function (PSF) of the imaging system varies spatially. Furthermore, the PSF is asymmetric, with the lateral resolution being lower than the axial resolution. For many medical applications, such as in vivo thyroid, breast and small animal imaging, multiple views of the target tissue at varying angles are possible. This can be exploited to reduce the asymmetry and spatial variation of system the PSF with simple spatial compounding. In this article, we present a formulation and experimental evaluation of this technique. PSF improvement in terms of resolution and Signal to Noise Ratio (SNR) with the proposed spatial compounding is evaluated through simulation. Overall image quality improvement is demonstrated with experiments on phantom and ex vivo tissue. When multiple views are not possible, an alternative residual refocusing algorithm is proposed. The performances of these two methods, both separately and in conjunction, are compared and their practical implications are discussed.
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Affiliation(s)
- Kalloor Joseph Francis
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India
- Corresponding author.
| | - Bhargava Chinni
- Department of Imaging Sciences, University of Rochester Medical Center, 601 Elmwood Ave, Rochester, NY 14642, USA
| | | | - Rajalakshmi Pachamuthu
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India
| | - Vikram S. Dogra
- Department of Imaging Sciences, University of Rochester Medical Center, 601 Elmwood Ave, Rochester, NY 14642, USA
| | - Navalgund Rao
- Chester F. Carlson Center for Imaging Science, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY 14623, USA
- Principal corresponding author.
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53
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Helfen A, Masthoff M, Claussen J, Gerwing M, Heindel W, Ntziachristos V, Eisenblätter M, Köhler M, Wildgruber M. Multispectral Optoacoustic Tomography: Intra- and Interobserver Variability Using a Clinical Hybrid Approach. J Clin Med 2019; 8:jcm8010063. [PMID: 30634409 PMCID: PMC6352009 DOI: 10.3390/jcm8010063] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 12/30/2018] [Accepted: 01/03/2019] [Indexed: 01/08/2023] Open
Abstract
Multispectral optoacoustic tomography (MSOT) represents a new imaging approach revealing functional tissue information without extrinsic contrast agents. Using a clinical combined ultrasound (US)/MSOT device, we investigated the interindividual robustness and impact of intra- and interobserver variability of MSOT values in soft tissue (muscle and subcutaneous fat) of healthy volunteers. Semiquantitative MSOT values for deoxygenated (Hb), oxygenated (HbO2) and total hemoglobin (HbT), as well as oxygen saturation (sO2), were calculated for both forearms in transversal and longitudinal probe orientation (n = 3, 8 measurements per subject). For intraobserver reproducibility, the same examiner investigated three subjects twice. Mean values of left vs. right forearm and transversal vs. longitudinal probe orientation were compared using an unpaired Student’s t test. Bland Altmann plots with 95% limits of agreement for absolute averages and differences were calculated. Intraclass correlation coefficients (ICC 2,k) were computed for three different examiners. We obtained reproducible and consistent MSOT values with small-to-moderate deviation for muscle and subcutaneous fat tissue. Probe orientation and body side had no impact on calculated MSOT values (p > 0.05 each). Intraobserver reproducibility revealed equable mean values with small-to-moderate deviation. For muscular tissue, good ICC was obtained for sO2. Measurements of subcutaneous tissue revealed good-to-excellent ICCs for all calculated values. Thus, in this preliminary study on healthy individuals, clinical MSOT provided consistent and reproducible functional soft tissue characterization, independent on the investigating personnel.
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Affiliation(s)
- Anne Helfen
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
| | - Max Masthoff
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
| | | | - Mirjam Gerwing
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
| | - Walter Heindel
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
| | - Vasilis Ntziachristos
- Institute for Biological and Medical Imaging, Technical University of Munich, 81675 Munich, Germany.
- Center for Translational Cancer Research 'TranslaTUM', Technical University of Munich, 81675 Munich, Germany.
| | - Michel Eisenblätter
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
- Division of Imaging Sciences & Biomedical Engineering, King's College London, London SE1 7EH, UK.
| | - Michael Köhler
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
| | - Moritz Wildgruber
- Institute of Clinical Radiology, Medical Faculty, University of Muenster, and University Hospital Muenster, 48149 Muenster, Germany.
- DFG EXC 1003 Cluster of Excellence 'Cells in Motion', University of Muenster, 48149 Muenster, Germany.
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Kazmierczak PM, Burton NC, Keinrath G, Hirner-Eppeneder H, Schneider MJ, Eschbach RS, Heimer M, Solyanik O, Todica A, Reiser MF, Ricke J, Cyran CC. Integrin-targeted quantitative optoacoustic imaging with MRI correlation for monitoring a BRAF/MEK inhibitor combination therapy in a murine model of human melanoma. PLoS One 2018; 13:e0204930. [PMID: 30281669 PMCID: PMC6169922 DOI: 10.1371/journal.pone.0204930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 09/17/2018] [Indexed: 11/18/2022] Open
Abstract
PURPOSE To investigate αvβ3-integrin-targeted optoacoustic imaging and MRI for monitoring a BRAF/MEK inhibitor combination therapy in a murine model of human melanoma. MATERIALS AND METHODS Human BRAF V600E-positive melanoma xenograft (A375)-bearing Balb/c nude mice (n = 10) were imaged before (day 0) and after (day 7) a BRAF/MEK inhibitor combination therapy (encorafenib, 1.3 mg/kg/d; binimetinib, 0.6 mg/kg/d, n = 5) or placebo (n = 5), respectively. Optoacoustic imaging was performed on a preclinical system unenhanced and 5 h after i. v. injection of an αvβ3-integrin-targeted fluorescent probe. The αvβ3-integrin-specific tumor signal was derived by spectral unmixing. For morphology-based tumor response assessments, T2w MRI data sets were acquired on a clinical 3 Tesla scanner. The imaging results were validated by multiparametric immunohistochemistry (ß3 -integrin expression, CD31 -microvascular density, Ki-67 -proliferation). RESULTS The αvβ3-integrin-specific tumor signal was significantly reduced under therapy, showing a unidirectional decline in all animals (from 7.98±2.22 to 1.67±1.30; p = 0.043). No significant signal change was observed in the control group (from 6.60±6.51 to 3.67±1.93; p = 0.500). Immunohistochemistry revealed a significantly lower integrin expression (ß3: 0.20±0.02 vs. 0.39±0.05; p = 0.008) and microvascular density (CD31: 119±15 vs. 292±49; p = 0.008) in the therapy group. Tumor volumes increased with no significant intergroup difference (therapy: +107±42 mm3; control +112±44mm3, p = 0.841). In vivo blocking studies with αvβ3-integrin antagonist cilengitide confirmed the target specificity of the fluorescent probe. CONCLUSIONS αvβ3-integrin-targeted optoacoustic imaging allowed for the early non-invasive monitoring of a BRAF/MEK inhibitor combination therapy in a murine model of human melanoma, adding molecular information on tumor receptor status to morphology-based tumor response criteria.
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Affiliation(s)
- Philipp M. Kazmierczak
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | | | - Georg Keinrath
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Heidrun Hirner-Eppeneder
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Moritz J. Schneider
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
- Comprehensive Pneumology Center, German Center for Lung Research, Munich, Germany
| | - Ralf S. Eschbach
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Maurice Heimer
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Olga Solyanik
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Andrei Todica
- Department of Nuclear Medicine, University Hospital, LMU Munich, München, Germany
| | - Maximilian F. Reiser
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Jens Ricke
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
| | - Clemens C. Cyran
- Department of Radiology, Laboratory for Experimental Radiology, University Hospital, LMU Munich, München, Germany
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55
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Schellenberg MW, Hunt HK. Hand-held optoacoustic imaging: A review. PHOTOACOUSTICS 2018; 11:14-27. [PMID: 30073147 PMCID: PMC6068331 DOI: 10.1016/j.pacs.2018.07.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/26/2018] [Accepted: 07/01/2018] [Indexed: 05/03/2023]
Abstract
Optoacoustic imaging is a medical imaging modality that uses optical excitation and acoustic detection to generate images of tissue structures based up optical absorption within a tissue sample. This imaging modality has been widely explored as a tool for a number of clinical applications, including cancer diagnosis and wound healing tracking. Recently, the optoacoustic imaging community has published a number of reports of hand-held optoacoustic imaging devices and platforms; these hand-held configurations improve the modality's potential for commercial clinical implementation. Here, we review recent advancements in hand-held optoacoustic imaging platforms and methods, including recent pre-clinical applications, and we present an overview of the remaining limitations in optoacoustic imaging that must be addressed to increase the translation of the modality into commercial and clinical use.
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Affiliation(s)
- Mason W. Schellenberg
- Department of Bioengineering, University of Missouri, 1406 E Rollin St., Columbia 65211, MO, USA
| | - Heather K. Hunt
- Department of Bioengineering, University of Missouri, 1406 E Rollin St., Columbia 65211, MO, USA
- Department of Dermatology, University of Missouri, 7 Hospital Dr., Columbia 65211, MO, USA
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56
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Merčep E, Deán-Ben XL, Razansky D. Imaging of blood flow and oxygen state with a multi-segment optoacoustic ultrasound array. PHOTOACOUSTICS 2018; 10:48-53. [PMID: 29988801 PMCID: PMC6032509 DOI: 10.1016/j.pacs.2018.04.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/03/2018] [Accepted: 04/23/2018] [Indexed: 05/03/2023]
Abstract
Changes in hemodynamic parameters are directly linked to biological function and physiological activity. Characterization of hemodynamics is commonly performed by Doppler ultrasound, which provides accurate measurements of blood flow velocity. Multi-spectral optoacoustic tomography is rapidly undergoing clinical translation fostered by its unique and complementary capacity for label-free mapping of the blood volume and the distribution of oxy- and deoxy-hemoglobin in blood. Here we report on a hybrid optoacoustic and ultrasound imaging approach that enables multi-modal imaging of blood flow and oxygen state using a multi-segment detector array. We further demonstrate rendering of multi-modal pulse-echo ultrasound, multi-spectral optoacoustic tomography, and color Doppler images from carotid artery of a healthy subject.
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Affiliation(s)
- Elena Merčep
- Faculty of Medicine, Technical University of Munich, Germany
- iThera Medical GmbH, Munich, Germany
| | - Xosé Luís Deán-Ben
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich, Neuherberg, Germany
| | - Daniel Razansky
- Faculty of Medicine, Technical University of Munich, Germany
- Institute for Biological and Medical Imaging (IBMI), Helmholtz Center Munich, Neuherberg, Germany
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Kalva SK, Hui ZZ, Pramanik M. Calibrating reconstruction radius in a multi single-element ultrasound-transducer-based photoacoustic computed tomography system. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2018; 35:764-771. [PMID: 29726481 DOI: 10.1364/josaa.35.000764] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 03/22/2018] [Indexed: 05/21/2023]
Abstract
In a circular scanning photoacoustic computed tomography (PAT/PACT) system, a single-element ultrasound transducer (SUT) (rotates in full 360° around the sample) or a full-ring array transducer is used to acquire the photoacoustic (PA) data from the target object. SUT takes several minutes to acquire the PA data, whereas the full-ring array transducer takes only few seconds. Hence, for real-time imaging, full-ring circular array transducers are preferred. However, these are custom built, very expensive, and not available readily on the market, whereas SUTs are cheap and easily available. Thus, PACT systems can be made cost effective by using SUTs. To improve the data acquisition speed, multiple SUTs can be employed at the same time. This will reduce the acquisition time by N-fold if N numbers of SUTs are used, each rotating 360/N degrees. Experimentally, all SUTs cannot be placed exactly at the same distance from the scanning center. Hence, the acquired PA data from each transducer need to be reconstructed with their corresponding radii in a delay-and-sum reconstruction algorithm. This requires the exact location of each SUT from the scanning center. Here, we propose a calibration method to find out the distance from the scanning center at which each SUT acquires the PA data. Three numerical phantoms were used to show the efficacy of the proposed method, and later it was validated with experimental data (point source phantom).
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58
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Clinical photoacoustic imaging platforms. Biomed Eng Lett 2018; 8:139-155. [PMID: 30603199 DOI: 10.1007/s13534-018-0062-7] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 03/18/2018] [Indexed: 01/08/2023] Open
Abstract
Photoacoustic imaging (PAI) is a new promising medical imaging technology available for diagnosing and assessing various pathologies. PAI complements existing imaging modalities by providing information not currently available for diagnosing, e.g., oxygenation level of the underlying tissue. Currently, researchers are translating PAI from benchside to bedside to make unique clinical advantages of PAI available for patient care. The requirements for a successful clinical PAI system are; deeper imaging depth, wider field of view, and faster scan time than the laboratory-level PAI systems. Currently, many research groups and companies are developing novel technologies for data acquisition/signal processing systems, detector geometry, and an acoustic sensor. In this review, we summarize state-of-the-art clinical PAI systems with three types of the imaging transducers: linear array transducer, curved linear array transducer, and volumetric array transducer. We will also discuss the limitations of the current PAI systems and describe latest techniques being developed to address these for further enhancing the image quality of PAI for successful clinical translation.
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Karlas A, Reber J, Liapis E, Paul-Yuan K, Ntziachristos V. Multispectral Optoacoustic Tomography of Brown Adipose Tissue. Handb Exp Pharmacol 2018; 251:325-336. [PMID: 29896652 DOI: 10.1007/164_2018_141] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
MSOT has revolutionized biomedical imaging because it allows anatomical, functional, and molecular imaging of deep tissues in vivo in an entirely noninvasive, label-free, and real-time manner. This imaging modality works by pulsing light onto tissue, triggering the production of acoustic waves, which can be collected and reconstructed to provide high-resolution images of features as deep as several centimeters below the body surface. Advances in hardware and software continue to bring MSOT closer to clinical translation. Most recently, a clinical handheld MSOT system has been used to image brown fat tissue (BAT) and its metabolic activity by directly resolving the spectral signatures of hemoglobin and lipids. This opens up new possibilities for studying BAT physiology and its role in metabolic disease without the need to inject animals or humans with contrast agents. In this chapter, we overview how MSOT works and how it has been implemented in preclinical and clinical contexts. We focus on our recent work using MSOT to image BAT in resting and activated states both in mice and humans.
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Affiliation(s)
- Angelos Karlas
- Chair of Biological Imaging, Technical University Munich, Munich, Germany
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg, Germany
| | - Josefine Reber
- Chair of Biological Imaging, Technical University Munich, Munich, Germany
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg, Germany
| | - Evangelos Liapis
- Chair of Biological Imaging, Technical University Munich, Munich, Germany
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg, Germany
| | - Korbinian Paul-Yuan
- Chair of Biological Imaging, Technical University Munich, Munich, Germany
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg, Germany
| | - Vasilis Ntziachristos
- Chair of Biological Imaging, Technical University Munich, Munich, Germany.
- Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, Neuherberg, Germany.
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Multispectral optoacoustic tomography of the human breast: characterisation of healthy tissue and malignant lesions using a hybrid ultrasound-optoacoustic approach. Eur Radiol 2017; 28:602-609. [PMID: 28786007 DOI: 10.1007/s00330-017-5002-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 06/22/2017] [Accepted: 07/21/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND AIM Multispectral optoacoustic tomography (MSOT) represents a new in vivo imaging technique with high resolution (~250 μm) and tissue penetration (>1 cm) using the photoacoustic effect. While ultrasound contains anatomical information for lesion detection, MSOT provides functional information based on intrinsic tissue chromophores. We aimed to evaluate the feasibility of combined ultrasound/MSOT imaging of breast cancer in patients compared to healthy volunteers. METHODS Imaging was performed using a handheld MSOT system for clinical use in healthy volunteers (n = 6) and representative patients with histologically confirmed invasive breast carcinoma (n = 5) and ductal carcinoma in situ (DCIS, n = 2). MSOT values for haemoglobin and oxygen saturation were assessed at 0.5, 1.0 and 1.5 cm depth and selected wavelengths between 700 and 850 nm. RESULTS Reproducible signals were obtained in all wavelengths with consistent MSOT signals in superficial tissue in breasts of healthy individuals. In contrast, we found increased signals for haemoglobin in invasive carcinoma, suggesting a higher perfusion of the tumour and tumour environment. For DCIS, MSOT values showed only little variation compared to healthy tissue. CONCLUSIONS This preliminary MSOT breast imaging study provided stable, reproducible data on tissue composition and physiological properties, potentially enabling differentiation of solid malignant and healthy tissue. KEY POINTS • A handheld MSOT probe enables real-time molecular imaging of the breast. • MSOT of healthy controls provides a reproducible reference for pathology identification. • MSOT parameters allows for differentiation of invasive carcinoma and healthy tissue.
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Yang M, Zhao L, He X, Su N, Zhao C, Tang H, Hong T, Li W, Yang F, Lin L, Zhang B, Zhang R, Jiang Y, Li C. Photoacoustic/ultrasound dual imaging of human thyroid cancers: an initial clinical study. BIOMEDICAL OPTICS EXPRESS 2017; 8:3449-3457. [PMID: 28717580 PMCID: PMC5508841 DOI: 10.1364/boe.8.003449] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 05/15/2017] [Accepted: 06/19/2017] [Indexed: 05/18/2023]
Abstract
We reported an initial clinical study of in vivo human thyroid by a photoacoustic/ultrasound handheld probe. Our dual-modality system is based on a high-end clinical ultrasound machine. Both healthy and cancerous thyroids were imaged non-invasively, and we compared the photoacoustic imaging with color Doppler ultrasound. The results of photoacoustic thyroid imaging could reveal many blood vessels that were not sensitive for Doppler ultrasound. Our study demonstrated that photoacoustic imaging could provide important complementary information for traditional ultrasound thyroid examination, which has a great potential for clinical diagnosis.
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Affiliation(s)
- Meng Yang
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
- These authors contributed equally to this work
| | - Lingyi Zhao
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
- These authors contributed equally to this work
| | - Xujin He
- Shenzhen Mindray Bio-Medical Electronics Co., Ltd., Shenzhen, China
| | - Na Su
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - ChenYang Zhao
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Hewen Tang
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Tao Hong
- Department of Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Wenbo Li
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Fang Yang
- Shenzhen Mindray Bio-Medical Electronics Co., Ltd., Shenzhen, China
| | - Lin Lin
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Bing Zhang
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Rui Zhang
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Yuxin Jiang
- Department of Ultrasonography, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Changhui Li
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
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