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Arias A, Anastasopoulou M, Gorpas D, Ntziachristos V. Using reflectometry to minimize the dependence of fluorescence intensity on optical absorption and scattering. BIOMEDICAL OPTICS EXPRESS 2023; 14:5499-5511. [PMID: 37854563 PMCID: PMC10581795 DOI: 10.1364/boe.496599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 09/11/2023] [Indexed: 10/20/2023]
Abstract
The total diffuse reflectance RT and the effective attenuation coefficient µeff of an optically diffuse medium map uniquely onto its absorption and reduced scattering coefficients. Using this premise, we developed a methodology where RT and the slope of the logarithmic spatially resolved reflectance, a quantity related to µeff, are the inputs of a look-up table to correct the dependence of fluorescent signals on the media's optical properties. This methodology does not require an estimation of the medium's optical property, avoiding elaborate simulations and their errors to offer accurate and fast corrections. The experimental demonstration of our method yielded a mean relative error in fluorophore concentrations of less than 4% over a wide range of optical property variations. We discuss how the method developed can be employed to improve image fidelity and fluorochrome quantification in fluorescence molecular imaging clinical applications.
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Affiliation(s)
- Augusto Arias
- Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich, 81675, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, 85764, Germany
| | - Maria Anastasopoulou
- Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich, 81675, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, 85764, Germany
| | - Dimitris Gorpas
- Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich, 81675, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, 85764, Germany
| | - Vasilis Ntziachristos
- Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich, 81675, Germany
- Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, 85764, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Munich, 81675, Germany
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Feruglio PF, Vinegoni C, Weissleder R. Extended dynamic range imaging for noise mitigation in fluorescence anisotropy imaging. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:JBO-200159R. [PMID: 32820624 PMCID: PMC7439791 DOI: 10.1117/1.jbo.25.8.086003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 07/27/2020] [Indexed: 06/11/2023]
Abstract
SIGNIFICANCE Fluorescence polarization (FP) and fluorescence anisotropy (FA) microscopy are powerful imaging techniques that allow to translate the common FP assay capabilities into the in vitro and in vivo cellular domain. As a result, they have found potential for mapping drug-protein or protein-protein interactions. Unfortunately, these imaging modalities are ratiometric in nature and as such they suffer from excessive noise even under regular imaging conditions, preventing accurate image-feature analysis of fluorescent molecules behaviors. AIM We present a high dynamic range (HDR)-based FA imaging modality for improving image quality in FA microscopy. APPROACH The method exploits ad hoc acquisition schemes to extend the dynamic range of individual FP channels, allowing to obtain FA images with increased signal-to-noise ratio. RESULTS A direct comparison between FA images obtained with our method and the standard, clearly indicates how an HDR-based FA imaging approach allows to obtain high-quality images, with the ability to correctly resolve image features at different values of FA and over a substantially higher range of fluorescence intensities. CONCLUSION The method presented is shown to outperform standard FA imaging microscopy narrowing the spread of the propagated error and yielding higher quality images. The method can be effectively and routinely used on any commercial imaging system and could be also translated to other microscopy ratiometric imaging modalities.
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Affiliation(s)
- Paolo Fumene Feruglio
- Massachusetts General Hospital, Harvard Medical School, Center for Systems Biology, Boston, Massachusetts, United States
- University of Verona, Department of Neuroscience, Biomedicine, and Movement Sciences, Verona, Italy
- ITS Meccatronico Veneto, Vicenza, Italy
| | - Claudio Vinegoni
- Massachusetts General Hospital, Harvard Medical School, Center for Systems Biology, Boston, Massachusetts, United States
| | - Ralph Weissleder
- Massachusetts General Hospital, Harvard Medical School, Center for Systems Biology, Boston, Massachusetts, United States
- Harvard Medical School, Department of Systems Biology, Boston, Massachusetts, United States
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3
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Yoon J, Grigoroiu A, Bohndiek SE. A background correction method to compensate illumination variation in hyperspectral imaging. PLoS One 2020; 15:e0229502. [PMID: 32168335 PMCID: PMC7069652 DOI: 10.1371/journal.pone.0229502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 02/09/2020] [Indexed: 12/12/2022] Open
Abstract
Hyperspectral imaging (HSI) can measure both spatial (morphological) and spectral (biochemical) information from biological tissues. While HSI appears promising for biomedical applications, interpretation of hyperspectral images can be challenging when data is acquired in complex biological environments. Variations in surface topology or optical power distribution at the sample, encountered for example during endoscopy, can lead to errors in post-processing of the HSI data, compromising disease diagnostic capabilities. Here, we propose a background correction method to compensate for such variations, which estimates the optical properties of illumination at the target based on the normalised spectral profile of the light source and the measured HSI intensity values at a fixed wavelength where the absorption characteristics of the sample are relatively low (in this case, 800 nm). We demonstrate the feasibility of the proposed method by imaging blood samples, tissue-mimicking phantoms, and ex vivo chicken tissue. Moreover, using synthetic HSI data composed from experimentally measured spectra, we show the proposed method would improve statistical analysis of HSI data. The proposed method could help the implementation of HSI techniques in practical clinical applications, where controlling the illumination pattern and power is difficult.
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Affiliation(s)
- Jonghee Yoon
- Department of Physics, University of Cambridge, Cambridge, England, United Kingdom
- Li Ka Shing Centre, Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, England, United Kingdom
| | - Alexandru Grigoroiu
- Department of Physics, University of Cambridge, Cambridge, England, United Kingdom
- Li Ka Shing Centre, Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, England, United Kingdom
| | - Sarah E. Bohndiek
- Department of Physics, University of Cambridge, Cambridge, England, United Kingdom
- Li Ka Shing Centre, Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, England, United Kingdom
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Ruiz AJ, LaRochelle EPM, Gunn JR, Hull SM, Hasan T, Chapman MS, Pogue BW. Smartphone fluorescence imager for quantitative dosimetry of protoporphyrin-IX-based photodynamic therapy in skin. JOURNAL OF BIOMEDICAL OPTICS 2019; 25:1-13. [PMID: 31820594 PMCID: PMC6901011 DOI: 10.1117/1.jbo.25.6.063802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 10/30/2019] [Indexed: 05/04/2023]
Abstract
Significance: While clinical treatment of actinic keratosis by photodynamic therapy (PDT) is widely practiced, there is a well-known variability in response, primarily caused by heterogeneous accumulation of the photosensitizer protoporphyrin IX (PpIX) between patients and between lesions, but measurement of this is rarely done. Aim: Develop a smartphone-based fluorescence imager for simple quantitative photography of the lesions and their PpIX levels that can be used in a new clinical workflow to guide the reliability of aminolevulinic acid (ALA) application for improved lesion clearance. Approach: The smartphone fluorescence imager uses an iPhone and a custom iOS application for image acquisition, a 3D-printed base for measurement standardization, an emission filter for PpIX fluorescence isolation, and a 405-nm LED ring for optical excitation. System performance was tested to ensure measurement reproducibility and the ability to capture photosensitizer accumulation and photobleaching in pre-clinical and clinical settings. Results: PpIX fluorescence signal from tissue-simulating phantoms showed linear sensitivity in the 0.01 to 2.0 μM range. Murine studies with Ameluz® aminolevulinic acid (ALA) gel and initial human testing with Levulan® ALA cream verified that in-vivo imaging was feasible, including that PpIX production over 1 h is easily captured and that photobleaching from the light treatment could be quantified. Conclusions: The presented device is the first quantitative wide-field fluorescence imaging system for PDT dosimetry designed for clinical skin use and for maximal ease of translation into clinical workflow. The results lay the foundation for using the system in clinical studies to establish treatment thresholds for the individualization of PDT treatment.
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Affiliation(s)
- Alberto J. Ruiz
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Address all correspondence to Alberto J. Ruiz, E-mail: ; Brian W. Pogue, E-mail:
| | | | - Jason R. Gunn
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Sally M. Hull
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
| | - Tayyaba Hasan
- Massachusetts General Hospital, Harvard Medical School, Wellman Center for Photomedicine, Boston, Massachusetts, United States
| | - M. Shane Chapman
- Geisel School of Medicine, Department of Surgery, Hanover, New Hampshire, United States
| | - Brian W. Pogue
- Dartmouth College, Thayer School of Engineering, Hanover, New Hampshire, United States
- Geisel School of Medicine, Department of Surgery, Hanover, New Hampshire, United States
- Address all correspondence to Alberto J. Ruiz, E-mail: ; Brian W. Pogue, E-mail:
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5
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Regression Analysis of Protoporphyrin IX Measurements Obtained During Dermatological Photodynamic Therapy. Cancers (Basel) 2019; 11:cancers11010072. [PMID: 30634715 PMCID: PMC6356372 DOI: 10.3390/cancers11010072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 01/04/2019] [Accepted: 01/07/2019] [Indexed: 12/04/2022] Open
Abstract
Photodynamic therapy (PDT) is a light activated drug therapy that can be used to treat a number of dermatological cancers and precancers. Improvement of efficacy is required to widen its application. Clinical protoporphyrin IX (PpIX) fluorescence data were obtained using a pre-validated, non-invasive imaging system during routine methyl aminolevulinate (MAL)-PDT treatment of 172 patients with licensed dermatological indications (37.2% actinic keratosis, 27.3% superficial basal cell carcinoma and 35.5% Bowen’s disease). Linear and logistic regressions were employed to model any relationships between variables that may have affected PpIX accumulation and/or PpIX photobleaching during irradiation and thus clinical outcome at three months. Patient age was found to be associated with lower PpIX accumulation/photobleaching, however only a reduction in PpIX photobleaching appeared to consistently adversely affect treatment efficacy. Clinical clearance was reduced in lesions located on the limbs, hands and feet with lower PpIX accumulation and subsequent photobleaching adversely affecting the outcome achieved. If air cooling pain relief was employed during light irradiation, PpIX photobleaching was lower and this resulted in an approximate three-fold reduction in the likelihood of achieving clinical clearance. PpIX photobleaching during the first treatment was concluded to be an excellent predictor of clinical outcome across all lesion types.
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Si HY, Cho MK, Kang JS, Noh CK, Shin SJ, Lim CS, Kim HM. Carboxylate-Containing Two-Photon Probe for the Simultaneous Detection of Extra- and Intracellular pH Values in Colon Cancer Tissue. Anal Chem 2018; 90:8058-8064. [DOI: 10.1021/acs.analchem.8b01114] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Choong-Kyun Noh
- Department of Gastroenterology, Ajou University School of Medicine, Suwon 443-721, Korea
| | - Sung Jae Shin
- Department of Gastroenterology, Ajou University School of Medicine, Suwon 443-721, Korea
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Zhang Y, Autry SA, McNamara LE, Nguyen ST, Le N, Brogdon P, Watkins DL, Hammer NI, Delcamp JH. Near-Infrared Fluorescent Thienothiadiazole Dyes with Large Stokes Shifts and High Photostability. J Org Chem 2017; 82:5597-5606. [DOI: 10.1021/acs.joc.7b00422] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yanbing Zhang
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Shane A. Autry
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Louis E. McNamara
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Suong T. Nguyen
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Ngoc Le
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Phillip Brogdon
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Davita L. Watkins
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Nathan I. Hammer
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
| | - Jared H. Delcamp
- Department of Chemistry and
Biochemistry, University of Mississippi, University, Mississippi 38677, United States
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8
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Abstract
Endomicroscopy is a new technique that allows human tissue to be characterized in vivo and in situ, circumventing the need for conventional biopsy and histology. Despite increased application and growing research interests in this area, the clinical application of endomicroscopy, however, is limited by difficulties in ergonomic control, consistent probe-tissue contact, large area surveillance, and retargeting. Recently, advances in high-speed imaging, mosaicing, and robotics have aimed to address these difficulties. The development of robot-assisted devices in particular has shown great promises in extending the clinical potential of endomicroscopy. Issues related to miniaturization, adaptation to tissue deformation, control stability, force and position compensation, cost, and sterility are being pursued by both research and commercial communities. In this review, recent clinical and technical developments in different aspects of computer and robotic assisted endomicroscopy interventions including instrumentation, multiscale integration, and high-speed imaging techniques are presented. We further address emerging trends and new research opportunities toward more widespread clinical acceptance of robotically assisted endomicroscopy technologies.
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Pogue BW, Paulsen KD, Samkoe KS, Elliott JT, Hasan T, Strong TV, Draney DR, Feldwisch J. Vision 20/20: Molecular-guided surgical oncology based upon tumor metabolism or immunologic phenotype: Technological pathways for point of care imaging and intervention. Med Phys 2017; 43:3143-3156. [PMID: 27277060 DOI: 10.1118/1.4951732] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Surgical guidance with fluorescence has been demonstrated in individual clinical trials for decades, but the scientific and commercial conditions exist today for a dramatic increase in clinical value. In the past decade, increased use of indocyanine green based visualization of vascular flow, biliary function, and tissue perfusion has spawned a robust growth in commercial systems that have near-infrared emission imaging and video display capabilities. This recent history combined with major preclinical innovations in fluorescent-labeled molecular probes, has the potential for a shift in surgical practice toward resection guidance based upon molecular information in addition to conventional visual and palpable cues. Most surgical subspecialties already have treatment management decisions partially based upon the immunohistochemical phenotype of the cancer, as assessed from molecular pathology of the biopsy tissue. This phenotyping can inform the surgical resection process by spatial mapping of these features. Further integration of the diagnostic and therapeutic value of tumor metabolism sensing molecules or immune binding agents directly into the surgical process can help this field mature. Maximal value to the patient would come from identifying the spatial patterns of molecular expression in vivo that are well known to exist. However, as each molecular agent is advanced into trials, the performance of the imaging system can have a critical impact on the success. For example, use of pre-existing commercial imaging systems are not well suited to image receptor targeted fluorophores because of the lower concentrations expected, requiring orders of magnitude more sensitivity. Additionally the imaging system needs the appropriate dynamic range and image processing features to view molecular probes or therapeutics that may have nonspecific uptake or pharmacokinetic issues which lead to limitations in contrast. Imaging systems need to be chosen based upon objective performance criteria, and issues around calibration, validation, and interpretation need to be established before a clinical trial starts. Finally, as early phase trials become more established, the costs associated with failures can be crippling to the field, and so judicious use of phase 0 trials with microdose levels of agents is one viable paradigm to help the field advance, but this places high sensitivity requirements on the imaging systems used. Molecular-guided surgery has truly transformative potential, and several key challenges are outlined here with the goal of seeing efficient advancement with ideal choices. The focus of this vision 20/20 paper is on the technological aspects that are needed to be paired with these agents.
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Affiliation(s)
- Brian W Pogue
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755 and Department of Surgery, Dartmouth College, Hanover, New Hampshire 03755
| | - Keith D Paulsen
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755; Department of Surgery, Dartmouth College, Hanover, New Hampshire 03755; and Department of Diagnostic Radiology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire 03755
| | - Kimberley S Samkoe
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755 and Department of Surgery, Dartmouth College, Hanover, New Hampshire 03755
| | - Jonathan T Elliott
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755
| | - Tayyaba Hasan
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114 and Division of Health Sciences and Technology, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
| | - Theresa V Strong
- Vector Production Facility, Division of Hematology Oncology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294
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10
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Lian L, Deng Y, Xie W, Xu G, Yang X, Zhang Z, Luo Q. High-dynamic-range fluorescence molecular tomography for imaging of fluorescent targets with large concentration differences. OPTICS EXPRESS 2016; 24:19920-33. [PMID: 27557267 DOI: 10.1364/oe.24.019920] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
When CCD-based free-space fluorescence molecular tomography (FMT) is used for imaging of fluorescent targets with a large concentration difference, the limited dynamic range of the CCD diminishes the localization and quantitative accuracy of FMT. To overcome this, we present a high-dynamic-range FMT (HDR-FMT) method. Under the multiple-exposure scheme, HDR fluorescence projection images are constructed using the recovered CCD response curve. Image reconstruction is implemented using iterative reweighted L1 regularization which can reduce artifacts by using fewer HDR fluorescence projection images. Phantom and in vivo animal studies indicate that localization of fluorescent targets with a large concentration difference is effectively improved with HDR-FMT and with good quantitative accuracy.
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11
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Watson JR, Gainer CF, Martirosyan N, Skoch J, Lemole GM, Anton R, Romanowski M. Augmented microscopy: real-time overlay of bright-field and near-infrared fluorescence images. JOURNAL OF BIOMEDICAL OPTICS 2015; 20:106002. [PMID: 26440760 PMCID: PMC4881285 DOI: 10.1117/1.jbo.20.10.106002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 09/02/2015] [Indexed: 05/10/2023]
Abstract
Intraoperative applications of near-infrared (NIR) fluorescent contrast agents can be aided by instrumentation capable of merging the view of surgical field with that of NIR fluorescence. We demonstrate augmented microscopy, an intraoperative imaging technique in which bright-field (real) and electronically processed NIR fluorescence (synthetic) images are merged within the optical path of a stereomicroscope. Under luminance of 100,000 lx, representing typical illumination of the surgical field, the augmented microscope detects 189 nM concentration of indocyanine green and produces a composite of the real and synthetic images within the eyepiece of the microscope at 20 fps. Augmentation described here can be implemented as an add-on module to visualize NIR contrast agents, laser beams, or various types of electronic data within the surgical microscopes commonly used in neurosurgical, cerebrovascular, otolaryngological, and ophthalmic procedures.
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Affiliation(s)
- Jeffrey R. Watson
- University of Arizona, Department of Biomedical Engineering, 1657 E. Helen Street, Tucson, Arizona 85721, United States
| | - Christian F. Gainer
- University of Arizona, Department of Biomedical Engineering, 1657 E. Helen Street, Tucson, Arizona 85721, United States
| | - Nikolay Martirosyan
- University of Arizona, Division of Neurosurgery, Department of Surgery, 1501 N. Campbell Avenue, Tucson, Arizona 85721, United States
| | - Jesse Skoch
- University of Arizona, Division of Neurosurgery, Department of Surgery, 1501 N. Campbell Avenue, Tucson, Arizona 85721, United States
| | - G. Michael Lemole
- University of Arizona, Division of Neurosurgery, Department of Surgery, 1501 N. Campbell Avenue, Tucson, Arizona 85721, United States
| | - Rein Anton
- University of Arizona, Division of Neurosurgery, Department of Surgery, 1501 N. Campbell Avenue, Tucson, Arizona 85721, United States
| | - Marek Romanowski
- University of Arizona, Department of Biomedical Engineering, 1657 E. Helen Street, Tucson, Arizona 85721, United States
- Address all correspondence to: Marek Romanowski, E-mail:
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Kress J, Rohrbach DJ, Carter KA, Luo D, Shao S, Lele S, Lovell JF, Sunar U. Quantitative imaging of light-triggered doxorubicin release. BIOMEDICAL OPTICS EXPRESS 2015; 6:3546-55. [PMID: 26417522 PMCID: PMC4574678 DOI: 10.1364/boe.6.003546] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 07/22/2015] [Accepted: 08/16/2015] [Indexed: 05/18/2023]
Abstract
The efficacy of chemotherapy is related, in large part, to the concentration of drug that reaches tumor sites. Doxorubicin (DOX) is a common anti-cancer drug that is also approved for use in liposomal form for the treatment of ovarian cancer. We recently developed a porphyrin-phospholipid (PoP)-liposome system that enables on demand release of DOX from liposomes using near infrared irradiation to improve DOX bioavailability. Owing to its intrinsic fluorescence, it is possible, and desirable, to quantify DOX concentration and distribution, preferably noninvasively. Here we quantified DOX distribution following light-triggered drug release in phantoms and an animal carcass using spatial frequency domain imaging. This study demonstrates the feasibility of non-invasive quantitative mapping of DOX distributions in target areas.
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Affiliation(s)
- Jeremy Kress
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
- Department of Biomedical, Industrial & Human Factors Engineering, Wright State University, Dayton, OH, USA
| | - Daniel J. Rohrbach
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
- Department of Biomedical, Industrial & Human Factors Engineering, Wright State University, Dayton, OH, USA
| | - Kevin A. Carter
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
| | - Dandan Luo
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
| | - Shuai Shao
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
| | - Shashikant Lele
- Department of Medicine, Roswell Park Cancer Institute, Buffalo, NY, USA
| | - Jonathan F. Lovell
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
| | - Ulas Sunar
- Department of Biomedical Engineering, University at Buffalo, Buffalo, NY, USA
- Department of Biomedical, Industrial & Human Factors Engineering, Wright State University, Dayton, OH, USA
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13
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Abstract
Mounting evidence suggests that a more extensive surgical resection is associated with an improved life expectancy for both low-grade and high-grade glioma patients. However, radiographically complete resections are not often achieved in many cases because of the lack of sensitivity and specificity of current neurosurgical guidance techniques at the margins of diffuse infiltrative gliomas. Intraoperative fluorescence imaging offers the potential to improve the extent of resection and to investigate the possible benefits of resecting beyond the radiographic margins. Here, we provide a review of wide-field and high-resolution fluorescence-imaging strategies that are being developed for neurosurgical guidance, with a focus on emerging imaging technologies and clinically viable contrast agents. The strengths and weaknesses of these approaches will be discussed, as well as issues that are being addressed to translate these technologies into the standard of care.
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Affiliation(s)
- Jonathan T C Liu
- *Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York; ‡Barrow Brain Tumor Research Center, Division of Neurosurgical Oncology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
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14
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Xie H, Svenmarker P, Axelsson J, Gräfe S, Kyriazi M, Bendsoe N, Andersson-Engels S, Svanberg K. Pharmacokinetic and biodistribution study following systemic administration of Fospeg®--a Pegylated liposomal mTHPC formulation in a murine model. JOURNAL OF BIOPHOTONICS 2015; 8:142-152. [PMID: 24375973 DOI: 10.1002/jbio.201300133] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 11/01/2013] [Accepted: 11/15/2013] [Indexed: 06/03/2023]
Abstract
Fospeg® is a newly developed photosensitizer formulation based on meso-tetra(hydroxyphenyl)chlorin (mTHPC), with hydrophilic liposomes to carry the hydrophobic photosensitizer to the target tissue. In this study the pharmacokinetics and biodistribution of Fospeg® were investigated by high performance liquid chromatography at various times (0.5-18 hours) following systemic i.v. administration. As a model an experimental HT29 colon tumor in NMRI nu/nu mice was employed. Our study indicates a higher plasma peak concentration, a longer circulation time and a better tumor-to-skin ratio than those of Foslip®, another liposomal mTHPC formulation. Data from ex vivo tissue fluorescence and reflectance imaging exhibit good correlation with chemical extraction. Our results have shown that optical imaging provides the potential for fluorophore quantification in biological tissues.
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Affiliation(s)
- Haiyan Xie
- Department of Physics, Lund University, P.O. Box 118, 22100, Lund, Sweden.
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15
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Laughney AM, Krishnaswamy V, Rizzo EJ, Schwab MC, Barth RJ, Cuccia DJ, Tromberg BJ, Paulsen KD, Pogue BW, Wells WA. Spectral discrimination of breast pathologies in situ using spatial frequency domain imaging. Breast Cancer Res 2014; 15:R61. [PMID: 23915805 PMCID: PMC3979079 DOI: 10.1186/bcr3455] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 07/18/2013] [Indexed: 02/03/2023] Open
Abstract
Introduction Nationally, 25% to 50% of patients undergoing lumpectomy for local management of breast cancer require a secondary excision because of the persistence of residual tumor. Intraoperative assessment of specimen margins by frozen-section analysis is not widely adopted in breast-conserving surgery. Here, a new approach to wide-field optical imaging of breast pathology in situ was tested to determine whether the system could accurately discriminate cancer from benign tissues before routine pathological processing. Methods Spatial frequency domain imaging (SFDI) was used to quantify near-infrared (NIR) optical parameters at the surface of 47 lumpectomy tissue specimens. Spatial frequency and wavelength-dependent reflectance spectra were parameterized with matched simulations of light transport. Spectral images were co-registered to histopathology in adjacent, stained sections of the tissue, cut in the geometry imaged in situ. A supervised classifier and feature-selection algorithm were implemented to automate discrimination of breast pathologies and to rank the contribution of each parameter to a diagnosis. Results Spectral parameters distinguished all pathology subtypes with 82% accuracy and benign (fibrocystic disease, fibroadenoma) from malignant (DCIS, invasive cancer, and partially treated invasive cancer after neoadjuvant chemotherapy) pathologies with 88% accuracy, high specificity (93%), and reasonable sensitivity (79%). Although spectral absorption and scattering features were essential components of the discriminant classifier, scattering exhibited lower variance and contributed most to tissue-type separation. The scattering slope was sensitive to stromal and epithelial distributions measured with quantitative immunohistochemistry. Conclusions SFDI is a new quantitative imaging technique that renders a specific tissue-type diagnosis. Its combination of planar sampling and frequency-dependent depth sensing is clinically pragmatic and appropriate for breast surgical-margin assessment. This study is the first to apply SFDI to pathology discrimination in surgical breast tissues. It represents an important step toward imaging surgical specimens immediately ex vivo to reduce the high rate of secondary excisions associated with breast lumpectomy procedures.
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Current Perspectives in the Use of Molecular Imaging To Target Surgical Treatments for Genitourinary Cancers. Eur Urol 2014; 65:947-64. [DOI: 10.1016/j.eururo.2013.07.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 07/17/2013] [Indexed: 01/17/2023]
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17
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Wang Y, Xu C, Ow H. Commercial nanoparticles for stem cell labeling and tracking. Theranostics 2013; 3:544-60. [PMID: 23946821 PMCID: PMC3741604 DOI: 10.7150/thno.5634] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 02/03/2013] [Indexed: 11/05/2022] Open
Abstract
Stem cell therapy provides promising solutions for diseases and injuries that conventional medicines and therapies cannot effectively treat. To achieve its full therapeutic potentials, the homing process, survival, differentiation, and engraftment of stem cells post transplantation must be clearly understood. To address this need, non-invasive imaging technologies based on nanoparticles (NPs) have been developed to track transplanted stem cells. Here we summarize existing commercial NPs which can act as contrast agents of three commonly used imaging modalities, including fluorescence imaging, magnetic resonance imaging and photoacoustic imaging, for stem cell labeling and tracking. Specifically, we go through their technologies, industry distributors, applications and existing concerns in stem cell research. Finally, we provide an industry perspective on the potential challenges and future for the development of new NP products.
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Affiliation(s)
- Yaqi Wang
- 1. Hybrid Silica Technologies, Cambridge, Massachusetts, USA 02139
| | - Chenjie Xu
- 2. Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457
| | - Hooisweng Ow
- 1. Hybrid Silica Technologies, Cambridge, Massachusetts, USA 02139
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Sunar U. Monitoring photodynamic therapy of head and neck malignancies with optical spectroscopies. World J Clin Cases 2013; 1:96-105. [PMID: 24303476 PMCID: PMC3845916 DOI: 10.12998/wjcc.v1.i3.96] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/02/2013] [Accepted: 05/08/2013] [Indexed: 02/05/2023] Open
Abstract
In recent years there has been significant developments in photosensitizers (PSs), light sources and light delivery systems that have allowed decreasing the treatment time and skin phototoxicity resulting in more frequent use of photodynamic therapy (PDT) in the clinical settings. Compared to standard treatment approaches such as chemo-radiation and surgery, PDT has much reduced morbidity for head and neck malignancies and is becoming an alternative treatment option. It can be used as an adjunct therapy to other treatment modalities without any additive cumulative side effects. Surface illumination can be an option for pre-malignant and early-stage malignancies while interstitial treatment is for debulking of thick tumors in the head and neck region. PDT can achieve equivalent or greater efficacy in treating head and neck malignancies, suggesting that it may be considered as a first line therapy in the future. Despite progressive development, clinical PDT needs improvement in several topics for wider acceptance including standardization of protocols that involve the same administrated light and PS doses and establishing quantitative tools for PDT dosimetry planning and response monitoring. Quantitative measures such as optical parameters, PS concentration, tissue oxygenation and blood flow are essential for accurate PDT dosimetry as well as PDT response monitoring and assessing therapy outcome. Unlike conventional imaging modalities like magnetic resonance imaging, novel optical imaging techniques can quantify PDT-related parameters without any contrast agent administration and enable real-time assessment during PDT for providing fast feedback to clinicians. Ongoing developments in optical imaging offer the promise of optimization of PDT protocols with improved outcomes.
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Sunar U, Rohrbach DJ, Morgan J, Zeitouni N, Henderson BW. Quantification of PpIX concentration in basal cell carcinoma and squamous cell carcinoma models using spatial frequency domain imaging. BIOMEDICAL OPTICS EXPRESS 2013; 4:531-7. [PMID: 23577288 PMCID: PMC3617715 DOI: 10.1364/boe.4.000531] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 03/05/2013] [Accepted: 03/05/2013] [Indexed: 05/17/2023]
Abstract
5-aminolaevulinic acid photodynamic therapy (ALA-PDT) is an attractive treatment option for nonmelanoma skin tumors, especially for multiple lesions and large areas. The efficacy of ALA-PDT is highly dependent on the photosensitizer (PS) concentration present in the tumor. Thus it is desirable to quantify PS concentration and distribution, preferably noninvasively to determine potential outcome. Here we quantified protoporphyrin IX (PpIX) distribution induced by topical and intra-tumoral (it) administration of the prodrug ALA in basal and squamous cell carcinoma murine models by using spatial frequency domain imaging (SFDI). The in vivo measurements were validated by analysis of the ex vivo extraction of PpIX. The study demonstrates the feasibility of non-invasive quantification of PpIX distributions in skin tumors.
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Affiliation(s)
- Ulas Sunar
- Department of Cell Stress Biology & PDT Center, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Daniel J. Rohrbach
- Department of Cell Stress Biology & PDT Center, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Janet Morgan
- Department of Dermatology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Natalie Zeitouni
- Department of Dermatology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Barbara W. Henderson
- Department of Cell Stress Biology & PDT Center, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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20
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Tan M, Ye Z, Lindner D, Brady-Kalnay SM, Lu ZR. Synthesis and evaluation of a targeted nanoglobular dual-modal imaging agent for MR imaging and image-guided surgery of prostate cancer. Pharm Res 2013; 31:1469-76. [PMID: 23471641 DOI: 10.1007/s11095-013-1008-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2012] [Accepted: 02/07/2013] [Indexed: 11/27/2022]
Abstract
PURPOSE To synthesize and evaluate a peptide targeted nanoglobular dual modal imaging agent specific to a cancer biomarker in tumor stroma for MRI and fluorescence visualization of prostate tumor in image-guided surgery. METHODS A peptide (CGLIIQKNEC, CLT1) targeted generation 2 nanoglobular (polylysine dendrimer with a silsesquioxane core) dual modal imaging agent, CLT1-G2-(Gd-DOTA-MA)-Cy5, was synthesized by stepwise conjugation of Gd-DOTA-MA, Cy5 and peptide to the dendrimer. Contrast enhanced MR imaging of the targeted dual imaging agent was evaluated on a Bruker 7T animal scanner with male athymic nude mice bearing orthotopic PC3-GFP prostate tumor. Fluorescence tumor imaging of the agent was carried out on a Maestro fluorescence imaging system. RESULTS The targeted agent CLT1-G2-(Gd-DOTA-MA)-Cy5 produced greater contrast enhancement in the tumor tissue than the control agent KAREC-G2-(Gd-DOTA-MA)-Cy5 at a dose of 30 μmol-Gd/kg in the MR images of the tumor bearing mice. Signal-to-noise ratio (SNR) of CLT1-G2-(Gd-DOTA-MA)-Cy5 in the tumor tissue was approximately 2 fold of that of the control agent in the first 15 min post-injection. The targeted agent also resulted in bright fluorescence signals in the tumor tissue. CONCLUSION The CLT1 peptide targeted nanoglobular dual-imaging agent CLT1-G2-(Gd-DOTA-MA)-Cy5 has a potential for MRI and fluorescence visualization of prostate tumor.
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Affiliation(s)
- Mingqian Tan
- Department of Biomedical Engineering, Case Western Reserve University, Wickenden Building, Room 427, 10900 Euclid Avenue, Cleveland, Ohio, 44106-7207, USA
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21
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Abstract
OBJECTIVE Optical imaging is experiencing significant technologic advances. Simultaneously, an array of specific optical imaging agents has brought new capabilities to biomedical research and is edging toward clinical use. We review progress in the translation of macroscopic optical imaging-including fluorescence-guided surgery and endoscopy, intravascular fluorescence imaging, diffuse fluorescence and optical tomography, and multispectral optoacoustics (photoacoustics)-for applications ranging from tumor resection and assessment of atherosclerotic plaques to dermatologic and breast examinations. CONCLUSION Optical imaging could play a major role in the move from imaging of structure and morphology to the visualization of the individual biologic processes underlying disease and could, therefore, contribute to more accurate diagnostics and improved treatment efficacy.
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Sarantopoulos A, Beziere N, Ntziachristos V. Optical and Opto-Acoustic Interventional Imaging. Ann Biomed Eng 2012; 40:346-66. [DOI: 10.1007/s10439-011-0501-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 12/23/2011] [Indexed: 12/20/2022]
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Saager RB, Cuccia DJ, Saggese S, Kelly KM, Durkin AJ. Quantitative fluorescence imaging of protoporphyrin IX through determination of tissue optical properties in the spatial frequency domain. JOURNAL OF BIOMEDICAL OPTICS 2011; 16:126013. [PMID: 22191930 PMCID: PMC3253591 DOI: 10.1117/1.3665440] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 11/09/2011] [Accepted: 11/10/2011] [Indexed: 05/17/2023]
Abstract
The ability to quantitatively determine tissue fluorescence is of interest for the purpose of better understanding the details of photodynamic therapy of skin cancer. In particular, we are interested in quantifying protoporphyrin IX (PpIX) in vivo. We present a method of correcting fluorescence for effects of native tissue absorption and scattering properties in a spatially resolved manner that preserves the resolution of the fluorescence imaging system, based off a homogeneous representation of tissue. Validation was performed using a series of liquid turbid phantoms having varying concentrations of absorber, scatterer, and fluorophore (PpIX). Through the quantification of tissue optical properties via spatial frequency domain imaging, an empirical model based on Monte Carlo simulations was deployed to successfully decouple the effects of absorption and scattering from fluorescence. From this we were able to deduce the concentration of the PpIX to within 0.2 μg/ml of the known concentration. This method was subsequently applied to the determination of PpIX concentration from in vivo normal skin where the model-based correction determined a concentration of 1.6 μg/ml, which is in agreement with literature.
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Affiliation(s)
- Rolf B Saager
- University of California Irvine, Beckman Laser Institute, 1002 Health Sciences Road, Irvine, California 92612, USA.
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24
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Ntziachristos V. Clinical translation of optical and optoacoustic imaging. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2011; 369:4666-4678. [PMID: 22006913 DOI: 10.1098/rsta.2011.0270] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Macroscopic optical imaging has rather humble technical origins; it has been mostly implemented by photographic means using appropriate filters, a light source and a camera yielding images of tissues. This approach relates to human vision and perception, and is simple to implement and use. Therefore, it has found wide acceptance, especially in recording fluorescence and bioluminescence signals. Yet, the difficulty in resolving depth and the dependence of the light intensity recorded on tissue optical properties may compromise the accuracy of the approach. Recently, optical technology has seen significant advances that bring a new performance level in optical investigations. Quantitative real-time multi-spectral optical and optoacoustic (photoacoustic) methods enable high-resolution quantitative imaging of tissue and disease biomarkers and can significantly enhance medical vision in diagnostic or interventional procedures such as dermatology, endoscopy, surgery, and various vascular and intravascular imaging applications. This performance is showcased herein and examples are given to illustrate how it is possible to shift the paradigm of optical clinical translation.
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Affiliation(s)
- Vasilis Ntziachristos
- Biological Imaging and Institute for Biological and Medical Imaging, Technische Universität München and Helmholtz Zentrum München, Munich, Germany.
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25
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Abd-Elgaliel WR, Cruz-Monserrate Z, Logsdon CD, Tung CH. Molecular imaging of Cathepsin E-positive tumors in mice using a novel protease-activatable fluorescent probe. MOLECULAR BIOSYSTEMS 2011; 7:3207-3213. [PMID: 21935563 DOI: 10.1039/c1mb05215b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
UNLABELLED The purpose of this study is to demonstrate the ability of imaging Cathepsin E (Cath E) positive tumors in living animals through selective targeting of Cath E proteolytic activity using a sensitive molecular imaging agent. METHODS A peptide-based Cath E imaging probe and a control probe were synthesized for this study. Human Cath E-positive cancer cells (MPanc96-E) were implanted subcutaneously in nude mice. Tumor-bearing mice were examined in vivo with near-infrared fluorescence (NIRF) imaging at various time points after intravenous injection of the Cath E sensing imaging probe. Excised organs and tissues of interest were further imaged ex vivo. RESULTS Upon specific Cath E proteolytic activation, the NIRF signal of the imaging probe a was converted from an optically quenched initial state to a highly fluorescent active state. Imaging probe a was able to highlight the Cath E-positive tumors as early as 24 h post injection. Fluorescent signal in tumor was 3-fold higher than background. The confined specificity of imaging probe a to tumor associated Cath E was verified by using control imaging probe b. Both in vivo and ex vivo imaging results confirmed the superior selectivity and sensitivity of imaging probe a in Cath E imaging. CONCLUSIONS The small animal studies demonstrated the capability of probe a for imaging Cath E-positive tumors. The developed optical probe could be applied in early diagnostic imaging and guiding subsequent surgical procedure.
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Affiliation(s)
- Wael R Abd-Elgaliel
- Department of Radiology, The Methodist Hospital Research Institute, Weill Cornell Medical College, 6565 Fannin Street, B5-009, Houston, TX 77030, USA
| | - Zobeida Cruz-Monserrate
- Department of Cancer Biology, University of Texas, M. D. Anderson Cancer Center, Houston, TX, USA
| | - Craig D Logsdon
- Department of Cancer Biology, University of Texas, M. D. Anderson Cancer Center, Houston, TX, USA.,Department of GI Medical Oncology, University of Texas, M. D. Anderson Cancer Center, Houston, TX, USA
| | - Ching-Hsuan Tung
- Department of Radiology, The Methodist Hospital Research Institute, Weill Cornell Medical College, 6565 Fannin Street, B5-009, Houston, TX 77030, USA
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Xie H, Liu H, Svenmarker P, Axelsson J, Xu CT, Gräfe S, Lundeman JH, Cheng HPH, Svanberg S, Bendsoe N, Andersen PE, Svanberg K, Andersson-Engels S. Drug quantification in turbid media by fluorescence imaging combined with light-absorption correction using white Monte Carlo simulations. JOURNAL OF BIOMEDICAL OPTICS 2011; 16:066002. [PMID: 21721803 DOI: 10.1117/1.3585675] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Accurate quantification of photosensitizers is in many cases a critical issue in photodynamic therapy. As a noninvasive and sensitive tool, fluorescence imaging has attracted particular interest for quantification in pre-clinical research. However, due to the absorption of excitation and emission light by turbid media, such as biological tissue, the detected fluorescence signal does not have a simple and unique dependence on the fluorophore concentration for different tissues, but depends in a complex way on other parameters as well. For this reason, little has been done on drug quantification in vivo by the fluorescence imaging technique. In this paper we present a novel approach to compensate for the light absorption in homogeneous turbid media both for the excitation and emission light, utilizing time-resolved fluorescence white Monte Carlo simulations combined with the Beer-Lambert law. This method shows that the corrected fluorescence intensity is almost proportional to the absolute fluorophore concentration. The results on controllable tissue phantoms and murine tissues are presented and show good correlations between the evaluated fluorescence intensities after the light-absorption correction and absolute fluorophore concentrations. These results suggest that the technique potentially provides the means to quantify the fluorophore concentration from fluorescence images.
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Affiliation(s)
- Haiyan Xie
- Lund University, Department of Physics, P.O. Box 118, SE-221 00, Lund, Sweden.
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Themelis G, Harlaar NJ, Kelder W, Bart J, Sarantopoulos A, van Dam GM, Ntziachristos V. Enhancing Surgical Vision by Using Real-Time Imaging of αvβ3-Integrin Targeted Near-Infrared Fluorescent Agent. Ann Surg Oncol 2011; 18:3506-13. [DOI: 10.1245/s10434-011-1664-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Indexed: 02/02/2023]
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Villa C, Erratico S, Razini P, Farini A, Meregalli M, Belicchi M, Torrente Y. In VivoTracking of Stem Cell by Nanotechnologies: Future Prospects for Mouse to Human Translation. TISSUE ENGINEERING PART B-REVIEWS 2011; 17:1-11. [DOI: 10.1089/ten.teb.2010.0362] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Chiara Villa
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Silvia Erratico
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Paola Razini
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Andrea Farini
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Mirella Meregalli
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Marzia Belicchi
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
| | - Yvan Torrente
- Stem Cell Laboratory, Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Università dėgli Studi di Milano, Milano, Italy
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In vivo quantification of photosensitizer fluorescence in the skin-fold observation chamber using dual-wavelength excitation and NIR imaging. Lasers Med Sci 2011; 26:789-801. [PMID: 21279401 PMCID: PMC3183248 DOI: 10.1007/s10103-011-0888-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Accepted: 01/05/2011] [Indexed: 10/24/2022]
Abstract
A major challenge in biomedical optics is the accurate quantification of in vivo fluorescence images. Fluorescence imaging is often used to determine the pharmacokinetics of photosensitizers used for photodynamic therapy. Often, however, this type of imaging does not take into account differences in and changes to tissue volume and optical properties of the tissue under interrogation. To address this problem, a ratiometric quantification method was developed and applied to monitor photosensitizer meso-tetra(hydroxyphenyl) chlorin (mTHPC) pharmacokinetics in the rat skin-fold observation chamber. The method employs a combination of dual-wavelength excitation and dual-wavelength detection. Excitation and detection wavelengths were selected in the NIR region. One excitation wavelength was chosen to be at the Q band of mTHPC, whereas the second excitation wavelength was close to its absorption minimum. Two fluorescence emission bands were used; one at the secondary fluorescence maximum of mTHPC centered on 720 nm, and one in a region of tissue autofluorescence. The first excitation wavelength was used to excite the mTHPC and autofluorescence and the second to excite only autofluorescence, so that this could be subtracted. Subsequently, the autofluorescence-corrected mTHPC image was divided by the autofluorescence signal to correct for variations in tissue optical properties. This correction algorithm in principle results in a linear relation between the corrected fluorescence and photosensitizer concentration. The limitations of the presented method and comparison with previously published and validated techniques are discussed.
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Tyrrell J, Campbell SM, Curnow A. Monitoring the accumulation and dissipation of the photosensitizer protoporphyrin IX during standard dermatological methyl-aminolevulinate photodynamic therapy utilizing non-invasive fluorescence imaging and quantification. Photodiagnosis Photodyn Ther 2010; 8:30-8. [PMID: 21333932 DOI: 10.1016/j.pdpdt.2010.11.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 11/06/2010] [Accepted: 11/09/2010] [Indexed: 12/29/2022]
Abstract
BACKGROUND Dermatological methyl-aminolevulinate photodynamic therapy (MAL-PDT) is utilized to successfully treat dermatological conditions. This study monitored fluorescence changes attributed to the accumulation and destruction of the photosensitizer, protoporphyrin IX (PpIX), at several different stages during the first and second treatments of clinical dermatological MAL-PDT. METHODS A commercially available, non-invasive, fluorescence imaging system (Dyaderm, Biocam, Germany) was utilized to monitor fluorescence changes during the first and second MAL-PDT treatments in seventy-five lesions. RESULTS The clinical data indicated statistically significant increases in fluorescence within lesions following the application of MAL for both treatments (P<0.001 and P<0.01 respectively) and subsequent statistically significant decreases in fluorescence within the lesions following light irradiation for both treatments (P<0.001 and P<0.01 respectively) whilst normal skin fluorescence remained unaltered. Lesions receiving a second treatment accumulated and dissipated significantly less PpIX (P<0.05) than during the first treatment. No significant differences were noted in PpIX accumulation or dissipation during MAL-PDT when gender, age, lesion type and lesion surface area were considered. CONCLUSIONS It can therefore be concluded that PpIX fluorescence imaging can be used in real-time to assess PpIX levels during dermatological PDT. Similar observations were recorded from the three currently licensed indications indicating that the standard 'one size fits all' protocol currently employed appears to allow adequate PpIX accumulation, which is subsequently fully utilized during light irradiation regardless of patient age, gender or lesion surface area.
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Affiliation(s)
- Jessica Tyrrell
- Clinical Photobiology, Peninsula Medical School, University of Exeter, Royal Cornwall Hospital, Truro, Cornwall, UK
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31
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Ntziachristos V, Yoo JS, van Dam GM. Current concepts and future perspectives on surgical optical imaging in cancer. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:066024. [PMID: 21198198 DOI: 10.1117/1.3523364] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
There are vibrant developments of optical imaging systems and contrast-enhancing methods that are geared to enhancing surgical vision and the outcome of surgical procedures. Such optical technologies designed for intraoperative use can offer high integration in the operating room compared to conventional radiological modalities adapted to intraoperative applications. Simple fluorescence epi-illumination imaging, in particular, appears attractive but may lead to inaccurate observations due to the complex nature of photon-tissue interaction. Of importance therefore are emerging methods that account for the background optical property variation in tissues and can offer accurate, quantitative imaging that eliminates the appearance of false negatives or positives. In parallel, other nonfluorescent optical imaging methods are summarized and overall progress in surgical optical imaging applications is outlined. Key future directions that have the potential to shift the paradigm of surgical health care are also discussed.
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Imaging the Bio-Distribution of Fluorescent Probes Using Multispectral Epi-Illumination Cryoslicing Imaging. Mol Imaging Biol 2010; 13:874-85. [DOI: 10.1007/s11307-010-0416-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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33
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Tyrrell J, Campbell S, Curnow A. Validation of a non-invasive fluorescence imaging system to monitor dermatological PDT. Photodiagnosis Photodyn Ther 2010; 7:86-97. [DOI: 10.1016/j.pdpdt.2010.03.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Revised: 03/09/2010] [Accepted: 03/14/2010] [Indexed: 12/29/2022]
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Celli JP, Spring BQ, Rizvi I, Evans CL, Samkoe KS, Verma S, Pogue BW, Hasan T. Imaging and photodynamic therapy: mechanisms, monitoring, and optimization. Chem Rev 2010; 110:2795-838. [PMID: 20353192 PMCID: PMC2896821 DOI: 10.1021/cr900300p] [Citation(s) in RCA: 1624] [Impact Index Per Article: 116.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jonathan P Celli
- Wellman Center for Photomedicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA
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35
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Stem cell tracking by nanotechnologies. Int J Mol Sci 2010; 11:1070-81. [PMID: 20480000 PMCID: PMC2869236 DOI: 10.3390/ijms11031070] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 02/11/2010] [Accepted: 03/08/2010] [Indexed: 11/18/2022] Open
Abstract
Advances in stem cell research have provided important understanding of the cell biology and offered great promise for developing new strategies for tissue regeneration. The beneficial effects of stem cell therapy depend also by the development of new approachs for the track of stem cells in living subjects over time after transplantation. Recent developments in the use of nanotechnologies have contributed to advance of the high-resolution in vivo imaging methods, including positron emission tomography (PET), single-photon emission tomography (SPECT), magnetic resonance (MR) imaging, and X-Ray computed microtomography (microCT). This review examines the use of nanotechnologies for stem cell tracking.
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36
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Themelis G, Yoo JS, Soh KS, Schulz R, Ntziachristos V. Real-time intraoperative fluorescence imaging system using light-absorption correction. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:064012. [PMID: 20059250 DOI: 10.1117/1.3259362] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
We present a novel fluorescence imaging system developed for real-time interventional imaging applications. The system implements a correction scheme that improves the accuracy of epi-illumination fluorescence images for light intensity variation in tissues. The implementation is based on the use of three cameras operating in parallel, utilizing a common lens, which allows for the concurrent collection of color, fluorescence, and light attenuation images at the excitation wavelength from the same field of view. The correction is based on a ratio approach of fluorescence over light attenuation images. Color images and video is used for surgical guidance and for registration with the corrected fluorescence images. We showcase the performance metrics of this system on phantoms and animals, and discuss the advantages over conventional epi-illumination systems developed for real-time applications and the limits of validity of corrected epi-illumination fluorescence imaging.
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Affiliation(s)
- George Themelis
- Technische Universitat München, Institute for Biological and Medical Imaging, Arcisstrasse 21, 80333 München, Germany
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Arbab AS, Janic B, Haller J, Pawelczyk E, Liu W, Frank JA. In Vivo Cellular Imaging for Translational Medical Research. Curr Med Imaging 2009; 5:19-38. [PMID: 19768136 DOI: 10.2174/157340509787354697] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Personalized treatment using stem, modified or genetically engineered, cells is becoming a reality in the field of medicine, in which allogenic or autologous cells can be used for treatment and possibly for early diagnosis of diseases. Hematopoietic, stromal and organ specific stem cells are under evaluation for cell-based therapies for cardiac, neurological, autoimmune and other disorders. Cytotoxic or genetically altered T-cells are under clinical trial for the treatment of hematopoietic or other malignant diseases. Before using stem cells in clinical trials, translational research in experimental animal models are essential, with a critical emphasis on developing noninvasive methods for tracking the temporal and spatial homing of these cells to target tissues. Moreover, it is necessary to determine the transplanted cell's engraftment efficiency and functional capability. Various in vivo imaging modalities are in use to track the movement and incorporation of administered cells. Tagging cells with reporter genes, fluorescent dyes or different contrast agents transforms them into cellular probes or imaging agents. Recent reports have shown that magnetically labeled cells can be used as cellular magnetic resonance imaging (MRI) probes, demonstrating the cell trafficking to target tissues. In this review, we will discuss the methods to transform cells into probes for in vivo imaging, along with their advantages and disadvantages as well as the future clinical applicability of cellular imaging method and corresponding imaging modality.
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Affiliation(s)
- Ali S Arbab
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, MI
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Abstract
A 3-chip CCD imaging system has been developed for quantitative in vivo fluorescence imaging. This incorporates a ratiometric algorithm to correct for the effects of tissue optical absorption and scattering, imaging “geometry” and tissue autofluorescence background. The performance was characterized, and the algorithm was validated in tissue-simulating optical phantoms for quantitative measurement of the fluorescent molecule protoporphyrin IX (PpIX). The technical feasibility to use this system for fluorescence-guided surgical resection of malignant brain tumor tissue was assessed in an animal model in which PpIX was induced exogenously in the tumor cells by systemic administration of aminolevulinic acid (ALA).
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