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O'Brien CM, Meng H, Shmuylovich L, Carpenter J, Gogineni P, Zhang H, Bishop K, Mondal SB, Sudlow GP, Bethea C, Bethea C, Achilefu S. Focal dynamic thermal imaging for label-free high-resolution characterization of materials and tissue heterogeneity. Sci Rep 2020; 10:12549. [PMID: 32724184 PMCID: PMC7387563 DOI: 10.1038/s41598-020-69362-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 07/10/2020] [Indexed: 11/30/2022] Open
Abstract
Evolution from static to dynamic label-free thermal imaging has improved bulk tissue characterization, but fails to capture subtle thermal properties in heterogeneous systems. Here, we report a label-free, high speed, and high-resolution platform technology, focal dynamic thermal imaging (FDTI), for delineating material patterns and tissue heterogeneity. Stimulation of focal regions of thermally responsive systems with a narrow beam, low power, and low cost 405 nm laser perturbs the thermal equilibrium. Capturing the dynamic response of 3D printed phantoms, ex vivo biological tissue, and in vivo mouse and rat models of cancer with a thermal camera reveals material heterogeneity and delineates diseased from healthy tissue. The intuitive and non-contact FDTI method allows for rapid interrogation of suspicious lesions and longitudinal changes in tissue heterogeneity with high-resolution and large field of view. Portable FDTI holds promise as a clinical tool for capturing subtle differences in heterogeneity between malignant, benign, and inflamed tissue.
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Affiliation(s)
- Christine M O'Brien
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Hongyu Meng
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Leonid Shmuylovich
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Julia Carpenter
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Praneeth Gogineni
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Haini Zhang
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Kevin Bishop
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Suman B Mondal
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Gail P Sudlow
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA
| | - Cheryl Bethea
- Quantum Technology Consultants, Inc., 8 Grist Mill Lane, Franklin Park, NJ, 08823, USA
| | - Clyde Bethea
- Quantum Technology Consultants, Inc., 8 Grist Mill Lane, Franklin Park, NJ, 08823, USA
| | - Samuel Achilefu
- Department of Radiology, Washington University School of Medicine, 4515 McKinley Ave., Couch Biomedical Research Building, St. Louis, MO, 63110, USA.
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA.
- Department of Medicine, Washington University School of Medicine, St. Louis, MO, 63110, USA.
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO, 63110, USA.
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Verkruysse W, Jia W, Franco W, Milner TE, Nelson JS. Infrared measurement of human skin temperature to predict the individual maximum safe radiant exposure (IMSRE). Lasers Surg Med 2008; 39:757-66. [PMID: 18081141 DOI: 10.1002/lsm.20581] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND AND OBJECTIVES Radiant exposure (RE) is a critical treatment parameter to be optimized for laser hair removal (LHR). An objective and quantitative method to assess the individual maximum safe radiant exposure (IMSRE) would help clinicians optimize LHR while at the same time providing the safest possible laser therapy. STUDY DESIGN Pulsed photo-thermal radiometry (PPTR) measurements were on a total of 403 spots on 13 volunteers. The radiometric signal at 20 milliseconds after the diagnostic laser pulse was used to predict the IMSRE using a simple analytic relationship. Laser pulses (wavelength 755 nm, 3 milliseconds pulse, 50 milliseconds cryogen spray cooling, 30 milliseconds delay) with RE's below and above the predicted IMSRE (range: 10-100 J/cm(2)) were applied and resulting injuries quantified through blind scoring. RESULTS IMSRE can be predicted quite robustly with PPTR for the broad range of human skin photo-types (I-IV) considered in this study. CONCLUSIONS The method presented herein should be useful in helping clinicians optimize LHR on an individual patient basis, with the highest possible safety.
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Affiliation(s)
- Wim Verkruysse
- Beckman Laser Institute and Medical Clinic, University of California-Irvine, 1002 Health Sciences Road East, Irvine, CA 92612, USA.
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