1
|
Liu W, Jin X, Li J, Xue Y, Li Y, Qian Z, Li W, Yan X. Study of cervical precancerous lesions detection by spectroscopy and support vector machine. MINIM INVASIV THER 2020; 30:208-214. [PMID: 32347137 DOI: 10.1080/13645706.2020.1723111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND AND OBJECTIVE Diffuse reflectance spectroscopy (DRS) offers a fast, non-invasive, and low-cost alternative for cervical cancer diagnosis. We aim to develop a method for screening precancerous lesions based on DRS. MATERIAL AND METHODS Characteristic parameters of cervical tissue were extracted from spectra, including optical characteristic parameters such as absorption and scattering coefficients, and some slope and area parameters of the spectrum. Data were randomly divided into training (60%) and test (40%) sets. Of the 210 included patients, 166 were healthy, 22 had erosion of the cervix, and 31 had cervical intraepithelial neoplasia (CIN). The support vector machine (SVM) algorithm was used to classify normal and abnormal cervical tissue based on 11 characteristic parameters. RESULTS The SVM with linear kernel function, applied on the training data, could distinguish tissue with lesions from healthy tissue with an accuracy of 1.00. When the classifiers were applied to the test set, erosion of cervix and CIN could be discriminated from healthy tissue with an accuracy of 0.95 (±0.03). CONCLUSIONS This research shows that the diagnostic algorithm can be valuable for non-invasive diagnosis of cervical cancer. This is a significant step toward the development of a tool for tissue assessment of cervical cancer.
Collapse
Affiliation(s)
- Wenwen Liu
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Xiaofei Jin
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Junjun Li
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Yanbai Xue
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Yiran Li
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Zhiyu Qian
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Weitao Li
- Department of Biomedical Engineering, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Xuemei Yan
- Department of Gynecology, Nanjing BenQ Hospital Co Ltd, Nanjing, China
| |
Collapse
|
2
|
Qi J, Elson DS. Mueller polarimetric imaging for surgical and diagnostic applications: a review. JOURNAL OF BIOPHOTONICS 2017; 10:950-982. [PMID: 28464464 DOI: 10.1002/jbio.201600152] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 05/02/2023]
Abstract
Polarization is a fundamental property of light and a powerful sensing tool that has been applied to many areas. A Mueller matrix is a complete mathematical description of the polarization characteristics of objects that interact with light, and is known as a transfer function of Stokes vectors which characterise the state of polarization of light. Mueller polarimetric imaging measures Mueller matrices over a field of view and thus allows for visualising the polarization characteristics of the objects. It has emerged as a promising technique in recent years for tissue imaging, improving image contrast and providing a unique perspective to reveal additional information that cannot be resolved by other optical imaging modalities. This review introduces the basis of the Stokes-Mueller formulism, interpretation methods of Mueller matrices into fundamental polarization properties, polarization properties of biological tissues, and considerations in the construction of Mueller polarimetric imaging devices for surgical and diagnostic applications, including primary configurations, optimization procedures, calibration methods as well as the instrument polarization properties of several widely-used biomedical optical devices. The paper also reviews recent progress in Mueller polarimetric endoscopes and fibre Mueller polarimeters, followed by the future outlook in applying the technique to surgery and diagnostics. Tissue polarization properties convey morphological, micro-structural and compositional information of tissue with great potential for label free characterization of tissue pathological changes. Recent progress in tissue polarimetric imaging and polarization resolved endoscopy paved the way for translation of polarimetric imaging to surgery and tissue diagnosis.
Collapse
Affiliation(s)
- Ji Qi
- Hamlyn Centre for Robotic Surgery, Institute of Global Health Innovation, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Daniel S Elson
- Hamlyn Centre for Robotic Surgery, Institute of Global Health Innovation, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
- Department of Surgery and Cancer, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| |
Collapse
|
3
|
Shaikh R, Prabitha VG, Dora TK, Chopra S, Maheshwari A, Deodhar K, Rekhi B, Sukumar N, Krishna CM, Subhash N. A comparative evaluation of diffuse reflectance and Raman spectroscopy in the detection of cervical cancer. JOURNAL OF BIOPHOTONICS 2017; 10:242-252. [PMID: 26929106 DOI: 10.1002/jbio.201500248] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 01/13/2016] [Accepted: 01/25/2016] [Indexed: 05/09/2023]
Abstract
Optical spectroscopic techniques show improved diagnostic accuracy for non-invasive detection of cervical cancers. In this study, sensitivity and specificity of two in vivo modalities, i.e diffuse reflectance spectroscopy (DRS) and Raman spectroscopy (RS), were compared by utilizing spectra recorded from the same sites (67 tumor (T), 22 normal cervix (C), and 57 normal vagina (V)). Data was analysed using principal component - linear discriminant analysis (PC-LDA), and validated using leave-one-out-cross-validation (LOOCV). Sensitivity, specificity, positive predictive value and negative predictive value for classification between normal (N) and tumor (T) sites were 91%, 96%, 95% and 93%, respectively for RS and 85%, 95%, 93% and 88%, respectively for DRS. Even though DRS revealed slightly lower diagnostic accuracies, owing to its lower cost and portability, it was found to be more suited for cervical cancer screening in low resource settings. On the other hand, RS based devices could be ideal for screening patients with centralised facilities in developing countries.
Collapse
Affiliation(s)
- Rubina Shaikh
- Chilakapati Laboratory, ACTREC, Kharghar, Navi Mumbai, 410210, India
| | - Vasumathi G Prabitha
- Biophotonics Laboratory, National Centre for Earth Science Studies, Akkulam, Thiruvananthapuram, 695 031, Kerala, India
| | - Tapas Kumar Dora
- Tata Memorial Center, Radiation Oncology, ACTREC, Kharghar, Navi Mumbai, 410210, India
| | - Supriya Chopra
- Tata Memorial Center, Radiation Oncology, ACTREC, Kharghar, Navi Mumbai, 410210, India
| | - Amita Maheshwari
- Tata Memorial Hospital, Gynecology Oncology, Parel, Mumbai, 400012, India
| | - Kedar Deodhar
- Tata Memorial Hospital, Surgical Pathology, Cytopathology, Parel, Mumbai, 400012, India
| | - Bharat Rekhi
- Tata Memorial Hospital, Surgical Pathology, Cytopathology, Parel, Mumbai, 400012, India
| | - Nita Sukumar
- Biophotonics Laboratory, National Centre for Earth Science Studies, Akkulam, Thiruvananthapuram, 695 031, Kerala, India
| | - C Murali Krishna
- Chilakapati Laboratory, ACTREC, Kharghar, Navi Mumbai, 410210, India
| | - Narayanan Subhash
- Sascan Meditech Pvt Ltd, Centre for Innovation in Medical Electronics, BMS College of Engineering, Basavanagudi, Bangalore, 560019, India
| |
Collapse
|
4
|
Lu R, Zhang Q, Zhi Y, Yao X. A polarization-sensitive light field imager for multi-channel angular spectroscopy of light scattering in biological tissues. Quant Imaging Med Surg 2015; 5:1-8. [PMID: 25694947 DOI: 10.3978/j.issn.2223-4292.2014.11.01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 10/19/2014] [Indexed: 11/14/2022]
Abstract
BACKGROUND Angular spectroscopy of light scattering can be used for quantitative analysis of cellular and subcellular properties, and thus promises a noninvasive methodology for in vivo assessment cellular integrity to complement in vitro histological examination. Spatial information is essential for accurate identification of localized abnormalities. However, conventional angular spectroscopy systems only provide single-channel measurement, which suffers from poor spatial resolution or requires time-consuming scanning over extended area. The purpose of this study was to develop a multi-channel angular spectroscopy for light field imaging in biological tissues. MATERIALS AND METHODS A microlens array (MLA) (8×8) based light field imager for 64-channel angular spectroscopy was developed. A pair of crossed polarizers was employed for polarization-sensitive recording to enable quantitative measurement at high signal specificity and sensitivity. The polarization-sensitive light field imager enables rapid measurement of multiple sampling volumes simultaneously at 18 μm spatial-resolution and 3° angular-resolution. Comparative light field imaging and electrophysiological examination of freshly isolated and physiologically deteriorated lobster leg nerves have been conducted. RESULTS Two-dimensional (2D) polarization-sensitive scattering patterns of the fresh nerves were highly elliptical, while they gradually lost the ellipticity and became rotationally symmetric (i.e., circular) as the nerves physiologically deteriorated due to repeated electrical stimulations. Characterized parameters, i.e., the ellipticity and the scattering intensity, rendered spatially various characteristics such as different values and deteriorating rates. CONCLUSIONS The polarization-sensitive light field imager is able to provide multi-channel angular spectroscopy of light scattering with both spatial and angular resolutions. The light scattering properties of nerves are highly dependent on the orientation of nerves and their physiological status. Further development of polarization-sensitive multi-channel angular spectroscopy may promise a methodology for rapid and reliable identification of localized abnormalities in biological tissues.
Collapse
Affiliation(s)
- Rongwen Lu
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Qiuxiang Zhang
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Yanan Zhi
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Xincheng Yao
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| |
Collapse
|
5
|
Lau C, Mirkovic J, Yu CC, O'Donoghue GP, Galindo L, Dasari R, de las Morenas A, Feld M, Stier E. Early detection of high-grade squamous intraepithelial lesions in the cervix with quantitative spectroscopic imaging. JOURNAL OF BIOMEDICAL OPTICS 2013; 18:76013. [PMID: 23843090 PMCID: PMC3706901 DOI: 10.1117/1.jbo.18.7.076013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 05/31/2013] [Accepted: 06/03/2013] [Indexed: 06/02/2023]
Abstract
Quantitative spectroscopy has recently been extended from a contact-probe to wide-area spectroscopic imaging to enable mapping of optical properties across a wide area of tissue. We train quantitative spectroscopic imaging (QSI) to identify cervical high-grade squamous intraepithelial lesions (HSILs) in 34 subjects undergoing the loop electrosurgical excision procedure (LEEP subjects). QSI's performance is then prospectively evaluated on the clinically suspicious biopsy sites from 47 subjects undergoing colposcopic-directed biopsy. The results show the per-subject normalized reduced scattering coefficient at 700 nm (An) and the total hemoglobin concentration are significantly different (p<0.05) between HSIL and non-HSIL sites in LEEP subjects. An alone retrospectively distinguishes HSIL from non-HSIL with 89% sensitivity and 83% specificity. It alone applied prospectively on the biopsy sites distinguishes HSIL from non-HSIL with 81% sensitivity and 78% specificity. The findings of this study agree with those of an earlier contact-probe study, validating the robustness of QSI, and specifically An, for identifying HSIL. The performance of An suggests an easy to use and an inexpensive to manufacture monochromatic instrument is capable of early cervical cancer detection, which could be used as a screening and diagnostic tool for detecting cervical cancer in low resource countries.
Collapse
Affiliation(s)
- Condon Lau
- Massachusetts Institute of Technology, George R. Harrison Spectroscopy Laboratory, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
The use of optical spectroscopy for in vivo detection of cervical pre-cancer. Lasers Med Sci 2013; 29:831-45. [PMID: 23467754 DOI: 10.1007/s10103-013-1288-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2012] [Accepted: 02/11/2013] [Indexed: 10/27/2022]
Abstract
In order to investigate the effectiveness of optical spectroscopy for in vivo diagnosis of cervical pre-cancerous conditions, a series of published studies are surveyed. The six optical technologies investigated include fluorescence spectroscopy, reflectance spectroscopy, and their combination using point probe or multispectral imaging approaches. Searching in the well-known databases, the most recent published works were sought out. Various aspects of the studies were evaluated including the details of the technology used, the pathologic threshold for tissue classification and the gold standard, the study population and prevalence of disease in this population, the method of measurement, the number of clinicians involved in the study, the classification and validation algorithms, and the performance in terms of sensitivity, specificity and, when available, the area under the receiver operating characteristic curve. Forty-four studies conducted from 1994 to 2012 were evaluated. The data are gathered in two comprehensive tables, and five illustrations are provided to simplify a comparison between studies from different points of view. There is a broad band of studies from small pilot studies through phase III clinical trials. Among the reviewed articles, only three factors were found to influence the performance of the optical spectroscopy studies. Multispectral approaches show higher specificity than the point probe approaches (p = 0.001). The use of acetic acid before measurement and prevalence of disease among the studied population, also, have an impact on the sensitivity and specificity of the studies (p < 0.05), respectively.
Collapse
|
7
|
Wade R, Spackman E, Corbett M, Walker S, Light K, Naik R, Sculpher M, Eastwood A. Adjunctive colposcopy technologies for examination of the uterine cervix--DySIS, LuViva Advanced Cervical Scan and Niris Imaging System: a systematic review and economic evaluation. Health Technol Assess 2013; 17:1-240, v-vi. [PMID: 23449335 PMCID: PMC4781255 DOI: 10.3310/hta17080] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Women in England (aged 25-64 years) are invited for cervical screening every 3-5 years to assess for cervical intraepithelial neoplasia (CIN) or cancer. CIN is a term describing abnormal changes in the cells of the cervix, ranging from CIN1 to CIN3, which is precancerous. Colposcopy is used to visualise the cervix. Three adjunctive colposcopy technologies for examination of the cervix have been included in this assessment: Dynamic Spectral Imaging System (DySIS), the LuViva Advanced Cervical Scan and the Niris Imaging System. OBJECTIVE To determine the clinical effectiveness and cost-effectiveness of adjunctive colposcopy technologies for examination of the uterine cervix for patients referred for colposcopy through the NHS Cervical Screening Programme. DATA SOURCES Sixteen electronic databases [Allied and Complementary Medicine Database (AMED), BIOSIS Previews, Cochrane Database of Systematic Reviews (CDSR), Cochrane Central Register of Controlled Trials (CENTRAL), Cumulative Index to Nursing and Allied Health Literature (CINAHL), Database of Abstracts of Reviews of Effects (DARE), EMBASE, Health Management Information Consortium (HMIC), Health Technology Assessment (HTA) database; Inspec, Inside Conferences, MEDLINE, NHS Economic Evaluation Database (NHS EED), PASCAL, Science Citation Index Expanded (SCIE) and Science Citation Index (SCI) - Conference Proceedings], and two clinical trial registries [ClinicalTrials.gov and Current Controlled Trials (CCT)] were searched to September-October 2011. REVIEW METHODS Studies comparing DySIS, LuViva or Niris with conventional colposcopy were sought; a narrative synthesis was undertaken. A decision-analytic model was developed, which measured outcomes in terms of quality-adjusted life-years (QALYs) and costs were evaluated from the perspective of the NHS and Personal Social Services with a time horizon of 50 years. RESULTS Six studies were included: two studies of DySIS, one study of LuViva and three studies of Niris. The DySIS studies were well reported and had a low risk of bias; they found higher sensitivity with DySIS (both the DySISmap alone and in combination with colposcopy) than colposcopy alone for identifying CIN2+ disease, although specificity was lower with DySIS. The studies of LuViva and Niris were poorly reported and had limitations, which indicated that their results were subject to a high risk of bias; the results of these studies cannot be considered reliable. The base-case cost-effectiveness analysis suggests that both DySIS treatment options are less costly and more effective than colposcopy alone in the overall weighted population; these results were robust to the ranges tested in the sensitivity analysis. DySISmap alone was more costly and more effective in several of the referral groups but the incremental cost-effectiveness ratio (ICER) was never higher than £1687 per QALY. DySIS plus colposcopy was less costly and more effective in all reasons for referral. Only indicative analyses were carried out on Niris and LuViva and no conclusions could be made on their cost-effectiveness. LIMITATIONS The assessment is limited by the available evidence on the new technologies, natural history of the disease area and current treatment patterns. CONCLUSIONS DySIS, particularly in combination with colposcopy, has higher sensitivity than colposcopy alone. There is no reliable evidence on the clinical effectiveness of LuViva and Niris. DySIS plus colposcopy appears to be less costly and more effective than both the DySISmap alone and colposcopy alone; these results were robust to the sensitivity analyses undertaken. Given the lack of reliable evidence on LuViva and Niris, no conclusions on their potential cost-effectiveness can be drawn. There is some uncertainty about how generalisable these findings will be to the population of women referred for colposcopy in the future, owing to the introduction of the human papillomavirus (HPV) triage test and uptake of the HPV vaccine.
Collapse
Affiliation(s)
- R Wade
- CRD/CHE Technology Assessment Group, Centre for Reviews and Dissemination, University of York, York, UK
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Marina OC, Sanders CK, Mourant JR. Correlating light scattering with internal cellular structures. BIOMEDICAL OPTICS EXPRESS 2012; 3:296-312. [PMID: 22312583 PMCID: PMC3269847 DOI: 10.1364/boe.3.000296] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 12/02/2011] [Accepted: 12/30/2011] [Indexed: 05/18/2023]
Abstract
The origins of side scattering from a fibroblast and cervical cell line were determined by comparing side-scatter images with images stained for lysosomes, nuclei, and mitochondria on a cell by cell basis. Lysosomes or nuclei are the most efficient type of scatterer depending on the cell type and incident light polarization. The relative scattering efficiencies of lysosomes and mitochondria were the same for both cell lines, while the scattering efficiencies of the nuclei differed. The percent of 90° scattering from the nucleus, mitochondria, and lysosomes as well as the group of other internal cellular objects was estimated. The nucleus was the largest contributor to side scatter in the cervical carcinoma cells. The contributions of lysosomes, mitochondria, the nucleus, and particles unstained by either Hoechst, LysoSensor or MitoTracker ranges from ∼20% to ∼30% in fibroblast cells. The contribution of lysosomes to side scatter was much stronger when the incident light was polarized perpendicular to the scattering plane than when the polarization of the side scatter laser was parallel to the scattering plane. This dependence on side scatter polarization indicates that lysosomes contain scattering structures that are much smaller than the wavelength of light used in the measurements (785 nm). In conclusion, mitochondria were not found to be either the most efficient scatterer or to have the largest contribution to scattering in either cell line, in contrast to previous reports. Rather lysosomes, nuclei and unknown particles all have significant contributions to 90° scattering and the contributions of some of these particles can be modulated by changing the polarization of the incident light.
Collapse
Affiliation(s)
- Oana C. Marina
- MS M888, Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Claire K. Sanders
- MS M888, Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Judith R. Mourant
- MS M888, Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| |
Collapse
|
9
|
Mirkovic J, Lau C, McGee S, Crum C, Badizadegan K, Feld M, Stier E. Detecting high-grade squamous intraepithelial lesions in the cervix with quantitative spectroscopy and per-patient normalization. BIOMEDICAL OPTICS EXPRESS 2011; 2:2917-25. [PMID: 22025992 PMCID: PMC3191455 DOI: 10.1364/boe.2.002917] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 09/01/2011] [Accepted: 09/07/2011] [Indexed: 05/31/2023]
Abstract
This study develops a spectroscopic algorithm for detection of cervical high grade squamous intraepithelial lesions (HSILs). We collected reflectance and fluorescence spectra with the quantitative spectroscopy probe to measure nine spectroscopic parameters from 43 patients undergoing standard colposcopy with directed biopsy. We found that there is improved accuracy for distinguishing HSIL from non-HSIL (low grade SIL and normal tissue) when we "normalized" spectroscopy parameters by dividing the values extracted from each clinically determined suspicious site by the corresponding value extracted from a clinically normal squamous site from the same patient. The "normalized" scattering parameter (A) at 700nm, best distinguished HSIL from non-HSIL with sensitivity and specificity of 89% and 79% suggesting that a simple, monochromatic instrument measuring only A may accurately detect HSIL.
Collapse
Affiliation(s)
- Jelena Mirkovic
- George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02179, USA
- Department of Pathology, Brigham and Women’s Hospital, 75 Francis Street, Boston, MA 02115, USA
| | - Condon Lau
- George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02179, USA
| | - Sasha McGee
- George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02179, USA
| | - Christopher Crum
- Department of Pathology, Brigham and Women’s Hospital, 75 Francis Street, Boston, MA 02115, USA
| | - Kamran Badizadegan
- Department of Pathology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Michael Feld
- George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02179, USA
| | - Elizabeth Stier
- Department of Obstetrics and Gynecology, Boston Medical Center, 85 East Concord Street, Boston, MA 02118, USA
| |
Collapse
|
10
|
Krishnaswamy V, Laughney AM, Paulsen KD, Pogue BW. Dark-field scanning in situ spectroscopy platform for broadband imaging of resected tissue. OPTICS LETTERS 2011; 36:1911-3. [PMID: 21593932 PMCID: PMC3538824 DOI: 10.1364/ol.36.001911] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
A dark-field geometry spectral imaging system is presented to raster scan thick tissue samples in situ in 1.5 cm square sections, recovering full spectra from each 100 μm diameter pixel. This spot size provides adequate resolution for wide field scanning, while also facilitating scatter imaging without requiring sophisticated light-tissue transport modeling. The system is demonstrated showing accurate estimation of localized scatter parameters and the potential to recover absorption-based contrast from broadband reflectance data measured from 480 nm up to 750 nm in tissue phantoms. Results obtained from xenograft pancreas tumors show the ability to quantitatively image changes in localized scatter response in this fast-imaging geometry. The polychromatic raster scan design allows the rapid scanning necessary for use in surgical/clinical applications where timely decisions are required about tissue pathology.
Collapse
Affiliation(s)
- Venkataramanan Krishnaswamy
- Thayer School of Engineering, 8000 Cummings Hall, Dartmouth College, Hanover, NH 03755
- Corresponding authors: or
| | - Ashley M. Laughney
- Thayer School of Engineering, 8000 Cummings Hall, Dartmouth College, Hanover, NH 03755
| | - Keith D. Paulsen
- Thayer School of Engineering, 8000 Cummings Hall, Dartmouth College, Hanover, NH 03755
| | - Brian W. Pogue
- Thayer School of Engineering, 8000 Cummings Hall, Dartmouth College, Hanover, NH 03755
- Corresponding authors: or
| |
Collapse
|
11
|
Mourant JR, Powers TM, Bocklage TJ, Greene HM, Dorin MH, Waxman AG, Zsemlye MM, Smith HO. In vivo light scattering for the detection of cancerous and precancerous lesions of the cervix. APPLIED OPTICS 2009; 48:D26-35. [PMID: 19340117 PMCID: PMC2966344 DOI: 10.1364/ao.48.000d26] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A noninvasive optical diagnostic system for detection of cancerous and precancerous lesions of the cervix was evaluated in vivo. The optical system included a fiber-optic probe designed to measure polarized and unpolarized light transport properties of a small volume of tissue. An algorithm for diagnosing tissue based on the optical measurements was developed that used four optical properties, three of which were related to light scattering properties and the fourth of which was related to hemoglobin concentration. A sensitivity of ~77% and specificities in the mid 60% range were obtained for separating high grade squamous intraepithelial lesions and cancer from other pathologies and normal tissue. The use of different cross-validation methods in algorithm development is analyzed, and the relative difficulties of diagnosing certain pathologies are assessed. Furthermore, the robustness of the optical system for use by different doctors and to changes in fiber-optic probe are also assessed, and potential improvements in the optical system are discussed.
Collapse
Affiliation(s)
- Judith R Mourant
- Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, MS E535, Los Alamos, New Mexico 87545, USA.
| | | | | | | | | | | | | | | |
Collapse
|