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Ben Yedder H, Cardoen B, Shokoufi M, Golnaraghi F, Hamarneh G. Multitask Deep Learning Reconstruction and Localization of Lesions in Limited Angle Diffuse Optical Tomography. IEEE TRANSACTIONS ON MEDICAL IMAGING 2022; 41:515-530. [PMID: 34606449 DOI: 10.1109/tmi.2021.3117276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Diffuse optical tomography (DOT) leverages near-infrared light propagation through tissue to assess its optical properties and identify abnormalities. DOT image reconstruction is an ill-posed problem due to the highly scattered photons in the medium and the smaller number of measurements compared to the number of unknowns. Limited-angle DOT reduces probe complexity at the cost of increased reconstruction complexity. Reconstructions are thus commonly marred by artifacts and, as a result, it is difficult to obtain an accurate reconstruction of target objects, e.g., malignant lesions. Reconstruction does not always ensure good localization of small lesions. Furthermore, conventional optimization-based reconstruction methods are computationally expensive, rendering them too slow for real-time imaging applications. Our goal is to develop a fast and accurate image reconstruction method using deep learning, where multitask learning ensures accurate lesion localization in addition to improved reconstruction. We apply spatial-wise attention and a distance transform based loss function in a novel multitask learning formulation to improve localization and reconstruction compared to single-task optimized methods. Given the scarcity of real-world sensor-image pairs required for training supervised deep learning models, we leverage physics-based simulation to generate synthetic datasets and use a transfer learning module to align the sensor domain distribution between in silico and real-world data, while taking advantage of cross-domain learning. Applying our method, we find that we can reconstruct and localize lesions faithfully while allowing real-time reconstruction. We also demonstrate that the present algorithm can reconstruct multiple cancer lesions. The results demonstrate that multitask learning provides sharper and more accurate reconstruction.
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Kim Y, Marone A, Tang W, Gartshteyn Y, Kim HK, Askanase AD, Kymissis I, Hielscher AH. Flexible optical imaging band system for the assessment of arthritis in patients with systemic lupus erythematosus. BIOMEDICAL OPTICS EXPRESS 2021; 12:1651-1665. [PMID: 33796379 PMCID: PMC7984785 DOI: 10.1364/boe.415575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
We have developed a flexible optical imaging system (FOIS) to assess systemic lupus erythematosus (SLE) arthritis in the finger joints. While any part of the body can be affected, arthritis in the finger joints is one of the most common SLE manifestations. There is an unmet need for accurate, low-cost assessment of lupus arthritis that can be easily performed at every clinic visit. Current imaging methods are imprecise, expensive, and time consuming to allow for frequent monitoring. Our FOIS can be wrapped around joints, and multiple light sources and detectors gather reflected and transmitted light intensities. Using data from two SLE patients and two healthy volunteers, we demonstrate the potential of this FOIS for assessment of arthritis in SLE patients.
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Affiliation(s)
- Youngwan Kim
- Columbia University, Department of Electrical Engineering, 500 W. 120th Street, New York, NY 10027, USA
- New York University, Department of Biomedical Engineering, Brooklyn, NY 11201, USA
| | - Alessandro Marone
- New York University, Department of Biomedical Engineering, Brooklyn, NY 11201, USA
| | - Wei Tang
- Columbia University Irving Medical Center, Department of Medicine-Rheumatology, 650 W. 168th Street, New York, NY 10032, USA
| | - Yevgeniya Gartshteyn
- Columbia University Irving Medical Center, Department of Medicine-Rheumatology, 650 W. 168th Street, New York, NY 10032, USA
| | - Hyun K. Kim
- New York University, Department of Biomedical Engineering, Brooklyn, NY 11201, USA
- Columbia University Irving Medical Center, Department of Radiology, 650 W. 168th Street, New York, NY 10032, USA
| | - Anca D. Askanase
- Columbia University Irving Medical Center, Department of Medicine-Rheumatology, 650 W. 168th Street, New York, NY 10032, USA
| | - Ioannis Kymissis
- Columbia University, Department of Electrical Engineering, 500 W. 120th Street, New York, NY 10027, USA
| | - Andreas H. Hielscher
- New York University, Department of Biomedical Engineering, Brooklyn, NY 11201, USA
- Columbia University, Department of Biomedical Engineering, 500 W. 120th Street, New York, NY 10027, USA
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Shokoufi M, Haeri Z, Lim ZY, Ramaseshan R, Golnaraghi F. Translation of a portable diffuse optical breast scanner probe for clinical application: a preliminary study. Biomed Phys Eng Express 2020; 6:015037. [PMID: 33438625 DOI: 10.1088/2057-1976/ab6e19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Most breast cancer lesions absorb higher levels of near-infrared (NIR) radiation compared to healthy breast tissue due to its increased vascularity. Oxy-hemoglobin (HbO2) and deoxy-hemoglobin (Hb) primarily found in cancerous vascular lesions, absorbs higher levels of radiation in the 650 nm to 850 nm wavelength range than the surrounding fatty tissue and water in the human breast. NIR diffuse optical spectroscopy (DOS) provides real-time functional and compositional information based on the optical properties of biological tissues, which cannot be accomplished by other portable breast imaging modalities. Here we present the first set of clinical trials using a non-invasive, hand-held diffuse optical breast scanner (DOB-Scan probe3) to capture in vivo cross-sectional images of the breast. The scanner uses four NIR illuminating sources with different wavelengths, 690 nm, 750 nm, 800 nm, and 850 nm, to determine the concentrations of the four main constituents of breast tissue, oxy-hemoglobin (HbO2), deoxy-hemoglobin (Hb), water (H2O), and fat. In this paper, we briefly explain the hardware design and image reconstruction algorithm of the DOB-Scan probe, the data collection process, and the imaging results of four different participants, selected from twenty, all who are diagnosed with breast cancer. For each patient, images were scanned from two locations, the first over the cancerous lesion and the second over the same region on the contralateral healthy breast, as a means of establishing controls for comparison. During each scan, four cross-sectional images of the breast, corresponding to four different NIR wavelengths, are reconstructed and displayed on a user interface for reference. Clinical results confirm that the absorption coefficients of cancerous lesions are significantly higher than the normal surrounding tissue. We propose to deploy the probe to effectively identify cancerous breast tissue at an early stage in a primary care setting, which could increase the efficiency of screening programs.
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Affiliation(s)
- Majid Shokoufi
- School of Mechatronic Systems Engineering, Simon Fraser University, 250-13450 102 Avenue, Surrey, BC, V3T 0A3, Canada
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Veesa JD, Dehghani H. Functional near infrared spectroscopy using spatially resolved data to account for tissue scattering: A numerical study and arm-cuff experiment. JOURNAL OF BIOPHOTONICS 2019; 12:e201900064. [PMID: 31169976 PMCID: PMC7065609 DOI: 10.1002/jbio.201900064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 06/03/2019] [Accepted: 06/04/2019] [Indexed: 05/12/2023]
Abstract
Functional Near-Infrared Spectroscopy (fNIRS) aims to recover changes in tissue optical parameters relating to tissue hemodynamics, to infer functional information in biological tissue. A widely-used application of fNIRS relies on continuous wave (CW) methodology that utilizes multiple distance measurements on human head for study of brain health. The typical method used is spatially resolved spectroscopy (SRS), which is shown to recover tissue oxygenation index (TOI) based on gradient of light intensity measured between two detectors. However, this methodology does not account for tissue scattering which is often assumed. A new parameter recovery algorithm is developed, which directly recovers both the scattering parameter and scaled chromophore concentrations and hence TOI from the measured gradient of light-attenuation at multiple wavelengths. It is shown through simulations that in comparison to conventional SRS which estimates cerebral TOI values with an error of ±12.3%, the proposed method provides more accurate estimate of TOI exhibiting an error of ±5.7% without any prior assumptions of tissue scatter, and can be easily implemented within CW fNIRS systems. Using an arm-cuff experiment, the obtained TOI using the proposed method is shown to provide a higher and more realistic value as compared to utilizing any prior assumptions of tissue scatter.
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Affiliation(s)
- Joshua D. Veesa
- School of Computer ScienceUniversity of BirminghamBirminghamUK
| | - Hamid Dehghani
- School of Computer ScienceUniversity of BirminghamBirminghamUK
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Istfan R, Roblyer DM, Larochelle S, Chaudhury R. A miniature frequency domain diffuse optical optode for quantitative wearable oximetry. OPTICAL TOMOGRAPHY AND SPECTROSCOPY OF TISSUE XIII 2019. [DOI: 10.1117/12.2509885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Ben Yedder H, Shokoufi M, Cardoen B, Golnaraghi F, Hamarneh G. Limited-Angle Diffuse Optical Tomography Image Reconstruction Using Deep Learning. LECTURE NOTES IN COMPUTER SCIENCE 2019. [DOI: 10.1007/978-3-030-32239-7_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Ben Yedder H, BenTaieb A, Shokoufi M, Zahiremami A, Golnaraghi F, Hamarneh G. Deep Learning Based Image Reconstruction for Diffuse Optical Tomography. MACHINE LEARNING FOR MEDICAL IMAGE RECONSTRUCTION 2018. [DOI: 10.1007/978-3-030-00129-2_13] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Kassab A, Le Lan J, Tremblay J, Vannasing P, Dehbozorgi M, Pouliot P, Gallagher A, Lesage F, Sawan M, Nguyen DK. Multichannel wearable fNIRS-EEG system for long-term clinical monitoring. Hum Brain Mapp 2017; 39:7-23. [PMID: 29058341 DOI: 10.1002/hbm.23849] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 10/02/2017] [Accepted: 10/08/2017] [Indexed: 01/27/2023] Open
Abstract
Continuous brain imaging techniques can be beneficial for the monitoring of neurological pathologies (such as epilepsy or stroke) and neuroimaging protocols involving movement. Among existing ones, functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) have the advantage of being noninvasive, nonobstructive, inexpensive, yield portable solutions, and offer complementary monitoring of electrical and local hemodynamic activities. This article presents a novel system with 128 fNIRS channels and 32 EEG channels with the potential to cover a larger fraction of the adult superficial cortex than earlier works, is integrated with 32 EEG channels, is light and battery-powered to improve portability, and can transmit data wirelessly to an interface for real-time display of electrical and hemodynamic activities. A novel fNIRS-EEG stretchable cap, two analog channels for auxiliary data (e.g., electrocardiogram), eight digital triggers for event-related protocols and an internal accelerometer for movement artifacts removal contribute to improve data acquisition quality. The system can run continuously for 24 h. Following instrumentation validation and reliability on a solid phantom, performance was evaluated on (1) 12 healthy participants during either a visual (checkerboard) task at rest or while pedalling on a stationary bicycle or a cognitive (language) task and (2) 4 patients admitted either to the epilepsy (n = 3) or stroke (n = 1) units. Data analysis confirmed expected hemodynamic variations during validation recordings and useful clinical information during in-hospital testing. To the best of our knowledge, this is the first demonstration of a wearable wireless multichannel fNIRS-EEG monitoring system in patients with neurological conditions. Hum Brain Mapp 39:7-23, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Ali Kassab
- Research Center, Centre Hospitalier Universitaire de Montréal, Université de Montréal, Montréal, Québec, H2X 0A9, Canada
| | - Jérôme Le Lan
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Julie Tremblay
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Phetsamone Vannasing
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Mahya Dehbozorgi
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Philippe Pouliot
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada.,Research Center, Montreal Heart Institute, Montréal, Québec, H1T 1C8, Canada
| | - Anne Gallagher
- Research Center, Hôpital Sainte-Justine, Université de Montréal, Montréal, Québec, H3T 1C4, Canada
| | - Frédéric Lesage
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Mohamad Sawan
- Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Dang Khoa Nguyen
- Research Center, Centre Hospitalier Universitaire de Montréal, Université de Montréal, Montréal, Québec, H2X 0A9, Canada.,Department of Neurology, Hôpital Notre-Dame (Centre Hospitalier de l'Université de Montréal), Montréal, Québec, H2L 4M1, Canada
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Fong CJ, Garzon MC, Hoi JW, Kim HK, Lauren CT, Morel K, Geller L, Antonov N, Weitz N, Wu J, Hielscher AH. Assessment of Infantile Hemangiomas Using a Handheld Wireless Diffuse Optical Spectroscopic Device. Pediatr Dermatol 2017; 34:386-391. [PMID: 28548465 PMCID: PMC5501760 DOI: 10.1111/pde.13150] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND/OBJECTIVES Infantile hemangiomas (IHs) are vascular tumors with the potential for significant morbidity. There is a lack of validated objective tools to assess IH severity and response to treatment. Diffuse optical spectroscopy (DOS), a noninvasive, nonionizing imaging modality, can measure total hemoglobin concentration and hemoglobin oxygen saturation in tissue to assess IH vascularity and response to treatment. Our objective was to evaluate the utility of a wireless, handheld DOS system to assess IH characteristics at selected points during their clinical course. METHODS Thirteen subjects (initial age 5.8 ± 2.0 mos) with 15 IHs were enrolled. IHs were classified as proliferative, plateau phase, or involuting. Nine patients with 11 IHs were untreated; four patients with 4 IHs were treated with timolol or propranolol. Each IH was evaluated by placing the DOS system directly on the lesion as well a normal contralateral skin site. IH vascularity and oxygenation were scored using a newly defined normalized hypoxia fraction (NHF) coefficient. Measurements were recorded at various intervals from the initial visit to 1 to 2 years of age. RESULTS For the nine untreated IHs, the NHF was highest at 6 months of age, during proliferation. Differences in NHFs between the proliferation and the plateau (p = 0.02) and involuting (p < 0.001) stages were statistically significant. In treated patients, the NHF normalized to 60% after 2 months. One treated IH came within 5% of the NHF for normal skin after 12 months. CONCLUSIONS DOS can be used to assess the vascularity and tissue oxygenation of IHs and monitor their progression and response to treatment.
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Affiliation(s)
- Christopher J Fong
- Department of Biomedical Engineering, Columbia University, New York City, New York
| | - Maria C Garzon
- Department of Dermatology, Columbia University Medical Center, New York City, New York.,Department of Pediatrics, Columbia University Medical Center, New York City, New York
| | - Jennifer W Hoi
- Department of Biomedical Engineering, Columbia University, New York City, New York
| | - Hyun K Kim
- Department of Radiology, Columbia University Medical Center, New York City, New York
| | - Christine T Lauren
- Department of Dermatology, Columbia University Medical Center, New York City, New York.,Department of Pediatrics, Columbia University Medical Center, New York City, New York
| | - Kimberly Morel
- Department of Dermatology, Columbia University Medical Center, New York City, New York.,Department of Pediatrics, Columbia University Medical Center, New York City, New York
| | - Lauren Geller
- Department of Pediatrics, Mount Sinai Hospital, New York City, New York.,Department of Dermatology, Mount Sinai Hospital, New York City, New York
| | - Nina Antonov
- Department of Dermatology, Columbia University Medical Center, New York City, New York
| | - Nicole Weitz
- Department of Dermatology, Columbia University Medical Center, New York City, New York
| | - June Wu
- Department of Surgery, Columbia University, New York City, New York
| | - Andreas H Hielscher
- Department of Biomedical Engineering, Columbia University, New York City, New York.,Department of Radiology, Columbia University Medical Center, New York City, New York.,Department of Electrical Engineering, Columbia University, New York City, New York
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Yang X, Hu Y, Li G, Lin L. Effect on measurement accuracy of transillumination using sawtooth-shaped-function optical signal. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:115106. [PMID: 27910699 DOI: 10.1063/1.4967184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Accepted: 10/24/2016] [Indexed: 06/06/2023]
Abstract
There exist lots of difficulties in optical transillumination of biological tissues, especially, low-level-light detection and low gray-scale resolution could reduce recognition accuracy of differences in tissue. Aiming at the problems, this paper proposes a method for optical transillumination using sawtooth-shaped-function optical signal and frame accumulation technology to explore the spatial information of heterogeneity in the tissue. Sawtooth-shaped-function optical signal combined with frame accumulation technology is applied to realize the low-level-light image detection, where frame accumulation technology improves the signal-to-noise ratio and detection sensitivity, and sawtooth-shaped-function signal improves gray-scale resolution. The results of the experiment applied on the flat-shaped phantom demonstrated that, compared with the constant intensity optical signal, the application of the sawtooth-shaped-function optical signal effectively improved the gray-scale resolution, thus improved the extraction accuracy on positional feature pixels of heterogeneity. In addition, the sawtooth-shaped-function optical signal reduces the light radiation per unit time and per unit area. Therefore, the proposed illuminated way is more suitable for the imaging of biological tissue.
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Affiliation(s)
- Xue Yang
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Yajia Hu
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Gang Li
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Ling Lin
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
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Godavarty A, Rodriguez S, Jung YJ, Gonzalez S. Optical imaging for breast cancer prescreening. BREAST CANCER-TARGETS AND THERAPY 2015; 7:193-209. [PMID: 26229503 PMCID: PMC4516032 DOI: 10.2147/bctt.s51702] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Breast cancer prescreening is carried out prior to the gold standard screening using X-ray mammography and/or ultrasound. Prescreening is typically carried out using clinical breast examination (CBE) or self-breast examinations (SBEs). Since CBE and SBE have high false-positive rates, there is a need for a low-cost, noninvasive, non-radiative, and portable imaging modality that can be used as a prescreening tool to complement CBE/SBE. This review focuses on the various hand-held optical imaging devices that have been developed and applied toward early-stage breast cancer detection or as a prescreening tool via phantom, in vivo, and breast cancer imaging studies. Apart from the various optical devices developed by different research groups, a wide-field fiber-free near-infrared optical scanner has been developed for transillumination-based breast imaging in our Optical Imaging Laboratory. Preliminary in vivo studies on normal breast tissues, with absorption-contrasted targets placed in the intramammary fold, detected targets as deep as 8.8 cm. Future work involves in vivo imaging studies on breast cancer subjects and comparison with the gold standard X-ray mammography approach.
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Affiliation(s)
- Anuradha Godavarty
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, FL, USA
| | - Suset Rodriguez
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, FL, USA
| | - Young-Jin Jung
- Department of Radiological Science, Dongseo University, Busan, South Korea
| | - Stephanie Gonzalez
- Optical Imaging Laboratory, Department of Biomedical Engineering, Florida International University, Miami, FL, USA
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Holmes JH. Methods and applications of evolutionary computation in biomedicine. J Biomed Inform 2014; 49:11-5. [PMID: 24874181 DOI: 10.1016/j.jbi.2014.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 05/12/2014] [Accepted: 05/13/2014] [Indexed: 12/20/2022]
Affiliation(s)
- John H Holmes
- Associate Professor of Medical Informatics in Epidemiology, Department of Biostatistics and Epidemiology, University of Pennsylvania, Perelman School of Medicine, United States.
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Zhang Q, Ivkovic V, Hu G, Strangman GE. Twenty-four-hour ambulatory recording of cerebral hemodynamics, systemic hemodynamics, electrocardiography, and actigraphy during people's daily activities. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:47003. [PMID: 24781591 DOI: 10.1117/1.jbo.19.4.047003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 03/05/2014] [Indexed: 06/03/2023]
Abstract
The feasibility and utility of wearable 24-h multimodality neuromonitoring during daily activities are demonstrated. We have developed a fourth-generation ambulatory near infrared spectroscopy device, namely NINscan 4. NINscan 4 enables recording of brain function (via cerebral hemodynamics), systemic hemodynamics, electrocardiography, and actigraphy simultaneously and continuously for up to 24 h at 250-Hz sampling rate, during (and with minor restriction to) daily activities. We present initial 24-h human subject test results, with example analysis including (1) comparison of cerebral perfusion and oxygenation changes during wakefulness and sleep over a 24-h period and (2) capturing of hemodynamic changes prior, during and after sudden waken up in the night during sleep. These results demonstrate the first ambulatory 24-h cerebral and systemic hemodynamics monitoring, and its unique advantages including long-term data collection and analysis capability, ability to catch unpredictable transient events during activities of daily living, as well as coregistered multimodality analysis capabilities. These results also demonstrate that NINscan 4's motion artifact at 1-g head movement is smaller than physiological hemodynamic fluctuations during motionless sleep. The broader potential of this technology is also discussed.
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Affiliation(s)
- Quan Zhang
- Massachusetts General Hospital, Harvard Medical School Neural Systems Group, 13th Street, Building 149, Room 2651, Charlestown, Massachusetts 02129bCenter for Space Medicine, Baylor College of Medicine, Houston, Texas
| | - Vladimir Ivkovic
- Massachusetts General Hospital, Harvard Medical School Neural Systems Group, 13th Street, Building 149, Room 2651, Charlestown, Massachusetts 02129
| | - Gang Hu
- Massachusetts General Hospital, Harvard Medical School Neural Systems Group, 13th Street, Building 149, Room 2651, Charlestown, Massachusetts 02129
| | - Gary E Strangman
- Massachusetts General Hospital, Harvard Medical School Neural Systems Group, 13th Street, Building 149, Room 2651, Charlestown, Massachusetts 02129bCenter for Space Medicine, Baylor College of Medicine, Houston, Texas
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Scholkmann F, Kleiser S, Metz AJ, Zimmermann R, Mata Pavia J, Wolf U, Wolf M. A review on continuous wave functional near-infrared spectroscopy and imaging instrumentation and methodology. Neuroimage 2014; 85 Pt 1:6-27. [PMID: 23684868 DOI: 10.1016/j.neuroimage.2013.05.004] [Citation(s) in RCA: 1009] [Impact Index Per Article: 100.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 04/12/2013] [Accepted: 05/03/2013] [Indexed: 01/09/2023] Open
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Santosa H, Hong MJ, Kim SP, Hong KS. Noise reduction in functional near-infrared spectroscopy signals by independent component analysis. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:073106. [PMID: 23902043 DOI: 10.1063/1.4812785] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Functional near-infrared spectroscopy (fNIRS) is used to detect concentration changes of oxy-hemoglobin and deoxy-hemoglobin in the human brain. The main difficulty entailed in the analysis of fNIRS signals is the fact that the hemodynamic response to a specific neuronal activation is contaminated by physiological and instrument noises, motion artifacts, and other interferences. This paper proposes independent component analysis (ICA) as a means of identifying the original hemodynamic response in the presence of noises. The original hemodynamic response was reconstructed using the primary independent component (IC) and other, less-weighting-coefficient ICs. In order to generate experimental brain stimuli, arithmetic tasks were administered to eight volunteer subjects. The t-value of the reconstructed hemodynamic response was improved by using the ICs found in the measured data. The best t-value out of 16 low-pass-filtered signals was 37, and that of the reconstructed one was 51. Also, the average t-value of the eight subjects' reconstructed signals was 40, whereas that of all of their low-pass-filtered signals was only 20. Overall, the results showed the applicability of the ICA-based method to noise-contamination reduction in brain mapping.
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Affiliation(s)
- Hendrik Santosa
- Department of Cogno-Mechatronics Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea
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Tavakoli B, Zhu Q. Two-step reconstruction method using global optimization and conjugate gradient for ultrasound-guided diffuse optical tomography. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:16006. [PMID: 23296038 PMCID: PMC3538037 DOI: 10.1117/1.jbo.18.1.016006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 10/29/2012] [Accepted: 11/02/2012] [Indexed: 05/18/2023]
Abstract
Ultrasound-guided diffuse optical tomography (DOT) is a promising method for characterizing malignant and benign lesions in the female breast. We introduce a new two-step algorithm for DOT inversion in which the optical parameters are estimated with the global optimization method, genetic algorithm. The estimation result is applied as an initial guess to the conjugate gradient (CG) optimization method to obtain the absorption and scattering distributions simultaneously. Simulations and phantom experiments have shown that the maximum absorption and reduced scattering coefficients are reconstructed with less than 10% and 25% errors, respectively. This is in contrast with the CG method alone, which generates about 20% error for the absorption coefficient and does not accurately recover the scattering distribution. A new measure of scattering contrast has been introduced to characterize benign and malignant breast lesions. The results of 16 clinical cases reconstructed with the two-step method demonstrates that, on average, the absorption coefficient and scattering contrast of malignant lesions are about 1.8 and 3.32 times higher than the benign cases, respectively.
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Affiliation(s)
- Behnoosh Tavakoli
- University of Connecticut, Electrical and Computer Engineering Department, Storrs, Connecticut 06269
| | - Quing Zhu
- University of Connecticut, Electrical and Computer Engineering Department, Storrs, Connecticut 06269
- Address all correspondence to: Quing Zhu, University of Connecticut, Electrical and Computer Engineering Department, 371 Fairfield Road, U1157, Storrs, Connecticut 06269. Tel: 860-486-5523; Fax: 860-486-2447; E-mail:
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