A theoretical and experimental study of light absorption and scattering by in vivo skin

Dawson, J. B.; Barker, Diane; Ellis, D. J.; Cotterill, J.A.; Grassam, E; Fisher, Gregory W.; Feather, J. W.

doi:10.1088/0031-9155/25/4/008

Cited by 330 publications

(218 citation statements)

References 7 publications

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“…Diffuse reflectance spectroscopy has been widely used for the evaluation of human skin chromophores at a single location. [1][2][3][4][5][6][7][8][9][10] The multispectral imaging technique is a useful tool for extending diffuse reflectance spectroscopy to spatial mapping of the chromophores in skin tissue. This can be simply achieved by a monochromatic CCD camera with narrow band filters and a white light source, which has been used to investigate the hemoglobin perfusion in living tissue.…”

Section: Introductionmentioning

confidence: 99%

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

et al. 2011

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Section: Introductionmentioning

confidence: 99%

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

et al. 2011

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“…They make use either of spectroscopy, or of echography, or of visible imaging. Several teams including Kopola et al [2], Dawson et al [3], FergusonPell et al [4], Hajizadeh-Saffar [5] or Diffey [6] suggest calculating an erythema index from reflectance measures in different carefully chosen spectral bands, by means of a spectroscope. Several methods among these were evaluated by Riordan et al [7].…”

Section: Introductionmentioning

confidence: 99%

Segmentation of Erythema from Skin Photographs for Assisted Diagnosis in Allergology

Roullot

Autegarden

Devriendt

et al. 2005

Pattern Recognition and Image Analysis

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Abstract. More than 2 people out of 10 suffer from allergies, which can take various forms, from eczema to anaphylactic reactions with possible lethal consequences. Diagnosis is achieved through so-called prick-tests or IDR (intradermo-reaction): the injection of a small quantity of substances suspected to cause the allergic manifestation induces an erythema, the size of which is a useful indicator for the diagnosis. The manual surface measurement is timeconsuming and inaccurate. This article presents a method for the semi-automatic measurement of the erythema from a photograph of the skin, taken in such conditions that lighting problems are minimized. The method is based on region growing and takes advantage of the most significant color spaces; the Lab space appears to be the best suited. It was tested on nearly 100 images, taken by various operators, on patients with various skin pigmentations; it gave promising results and proved to be robust.

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“…(1) A r,g,b = 100×Log 10 (1/R r,g,b ); where A, according to the model of Dawson et al [16] , is the absorbance of the skin and R is the reflectance. If it is assumed that MI can be obtained from the absorbance of the red channel (A r ), then:…”

Section: Methodsmentioning

confidence: 99%

Digital dermoscopy to determine skin melanin index as an objective indicator of skin pigmentation

et al. 2016

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Clinical assessment of skin photosensitivity is subjectively determined by erythema and tanning responses to sunlight recalled by the subject, alternatively known as Fitzpatrick Skin Phototype (SPT). Responses may be unreliable due to recall bias, subjective bias by clinicians and subjects, and lack of cultural sensitivity of the questions. Analysis of red-green-blue (RGB) color spacing of digital images may provide an objective determination of SPT. This paper presents the studies to assess the melanin index (MI), as determined by RGB images obtained by both standard digital camera as well as by videodermoscope, and to correlate the MI with SPT based upon subjects' verbal responses to standardized questions administered by a dermatologist.A sample of subjects representing all SPTs I-VI was selected. Both the digital camera and videodermoscope were calibrated at standard illumination, light source and white balance. Images of constitutive skin of the upper ventral arm were taken of each subject using both instruments. The studies showed that 58 subjects (20 M, 38 F) were enrolled in the study (mean age: 47 years; range: 20-89), stratified to skin phototype I-VI. MI obtained by using both digital camera and videodermoscope increased significantly as the SPT increased (p = 0.004 and p < 0.0001, respectively) and positively correlated with dermatologist-assessed SPT (Spearman correlation, r = 0.48 and r = 0.84, respectively). Digital imaging can quantify melanin content in order to quantitatively approximate skin pigmentation in all skin phototypes including Type VI skin. This methodology holds promise as a simple, non-invasive, rapid and objective approach to reliably determine skin phototype and, with further investigation, may prove to be both practical and useful in the prediction of skin cancer risk.

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A theoretical and experimental study of light absorption and scattering by in vivo skin

Cited by 330 publications

References 7 publications

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

Noninvasive imaging of human skin hemodynamics using a digital red-green-blue camera

Segmentation of Erythema from Skin Photographs for Assisted Diagnosis in Allergology

Digital dermoscopy to determine skin melanin index as an objective indicator of skin pigmentation

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