Imaging skin pathology with polarized light

Steven Jacques, Jessica C. Ramella-Roman, Ken Lee

Research output: Contribution to journalArticle

451 Citations (Scopus)

Abstract

Linearly polarized light that illuminates skin is backscattered by superficial layers and rapidly depolarized by birefringent collagen fibers. It is possible to distinguish such superficially backscattered light from the total diffusely reflected light that is dominated by light penetrating deeply into the dermis. The method involves acquisition of two images through an analyzing linear polarizer in front of the camera, one image (lpar) acquired with the analyzer oriented parallel to the polarization of illumination and one image (lper) acquired with the analyzer oriented perpendicular to the illumination. An image based on the polarization ratio, Pol=(lpar-lper)/(lpar+lper), is created. This paper compares normal light images, represented by lper, and Pol images of various skin pathologies in a pilot clinical study using incoherent visible-spectrum light. Images include pigmented skin sites (freckle, tattoo, pigmented nevi) and unpigmented skin sites [nonpigmented intradermal nevus, neurofibroma, actinic keratosis, malignant basal cell carcinoma, squamous cell carcinoma, vascular abnormality (venous lake), burn scar]. Images of a shadow cast from a razor blade onto a forearm skin site illustrate the behavior of Po[ values near the shadow edge. Near the shadow edge, Pol approximately doubles in value because no lper photons are superficially scattered into the shadow-edge pixels by the shadow region while lpar photons are directly backscattered from the superficial layer of these pixels. This result suggests that the point spread function in skin for cross-talk between Poi pixels has a half-width-half-max of about 390 μm.

Original languageEnglish (US)
Pages (from-to)329-340
Number of pages12
JournalJournal of Biomedical Optics
Volume7
Issue number3
DOIs
StatePublished - Jul 2002

Fingerprint

pathology
Pathology
Light polarization
polarized light
Skin
Imaging techniques
Light
Pixels
Lighting
Photons
pixels
Intradermal Nevus
Polarization
Actinic Keratosis
Melanosis
Pigmented Nevus
Neurofibroma
analyzers
razor blades
cancer

Keywords

  • Biomedical optics
  • Imaging
  • Polarized light
  • Skin

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Radiology Nuclear Medicine and imaging
  • Atomic and Molecular Physics, and Optics
  • Radiological and Ultrasound Technology

Cite this

Jacques, S., Ramella-Roman, J. C., & Lee, K. (2002). Imaging skin pathology with polarized light. Journal of Biomedical Optics, 7(3), 329-340. https://doi.org/10.1117/1.1484498

Imaging skin pathology with polarized light. / Jacques, Steven; Ramella-Roman, Jessica C.; Lee, Ken.

In: Journal of Biomedical Optics, Vol. 7, No. 3, 07.2002, p. 329-340.

Research output: Contribution to journalArticle

Jacques, S, Ramella-Roman, JC & Lee, K 2002, 'Imaging skin pathology with polarized light', Journal of Biomedical Optics, vol. 7, no. 3, pp. 329-340. https://doi.org/10.1117/1.1484498
Jacques, Steven ; Ramella-Roman, Jessica C. ; Lee, Ken. / Imaging skin pathology with polarized light. In: Journal of Biomedical Optics. 2002 ; Vol. 7, No. 3. pp. 329-340.
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