Skin pigmentation characterized by visible reflectance measurements

Norvang, L. T.; Milner, Thomas E.; Nelson, J. Stuart; Berns, Michael W.; Svaasand, Lars O.

doi:10.1007/bf02763978

Cited by 22 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(14) to (16) On comparison of the model for collimated illumination based on Keijzer's approach and Svaasand's model some differences are observed. These include the right-handside of the diffusion equation, the boundary condition at z = 0, and the interface condition forcing continuity of (the normal component of) the radiative flux.…”

Section: Layered Kezer Modelfor Collimated Illuminationmentioning

confidence: 82%

See 1 more Smart Citation

Retrieval of optical properties of skin from measurement and modeling the diffuse reflectance

Douven

Lucassen

2000

SPIE Proceedings

View full text Add to dashboard Cite

We present results on the retrieval of skin optical properties obtained by fitting of measurements of the diffuse reflectance of human skin. Reflectance spectra are simulated using an analytical model based on the diffusion approximation. This model is implemented in a simplex fit routine. The skin optical model used consists of five layers representing epidermis, capillary blood plexus, dermis, deep blood plexus and hypodermis. The optical properties of each layer are assumed homogeneously distributed. The main optical absorbers included are melanin in epidermis and blood. The experimental set up consists of a HP photospectrometer equipped with a remote fiber head. Total reflectance spectra were measured in the 400-820nm wavelength range on the volar under arm of 1 9 volunteers under various conditions influencing the blood content and oxygenation degree. Changes in the reflectance spectra were observed. Using the fit routine changes in blood content in the capillary blood plexus and in the deep blood plexus could be quantified. These showed different influences on the total reflectance. The method can be helpful to quantitatively assess changes in skin color appearance such as occurs in the treatment of port wine stains, blanching, skin irritation and tanning.

show abstract

Section: Layered Kezer Modelfor Collimated Illuminationmentioning

confidence: 82%

“…Measured reflectance spectra are fitted using the diffusion approximation, see equations (14) to (16). In the experiments considered here, it is assumed that the induced changes will only affect blood concentrations B.…”

Section: Fit Proceduresmentioning

confidence: 99%

Retrieval of optical properties of skin from measurement and modeling the diffuse reflectance

Douven

Lucassen

2000

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…Following this assessment, we selected a skin model with two layers, epidermis and dermis. The epidermis layer main component is the melanin [35] while the dermis main component is the haemoglobin. We consider the epidermal thickness to be the effective melanin layer thickness and the dermal thickness as the effective haemoglobin layer thickness.…”

Section: Methodsmentioning

confidence: 99%

Skin Parameter Map Retrieval from a Dedicated Multispectral Imaging System Applied to Dermatology/Cosmetology

Jolivot

Benezeth

Marzani

2013

International Journal of Biomedical Imaging

View full text Add to dashboard Cite

In vivo quantitative assessment of skin lesions is an important step in the evaluation of skin condition. An objective measurement device can help as a valuable tool for skin analysis. We propose an explorative new multispectral camera specifically developed for dermatology/cosmetology applications. The multispectral imaging system provides images of skin reflectance at different wavebands covering visible and near-infrared domain. It is coupled with a neural network-based algorithm for the reconstruction of reflectance cube of cutaneous data. This cube contains only skin optical reflectance spectrum in each pixel of the bidimensional spatial information. The reflectance cube is analyzed by an algorithm based on a Kubelka-Munk model combined with evolutionary algorithm. The technique allows quantitative measure of cutaneous tissue and retrieves five skin parameter maps: melanin concentration, epidermis/dermis thickness, haemoglobin concentration, and the oxygenated hemoglobin. The results retrieved on healthy participants by the algorithm are in good accordance with the data from the literature. The usefulness of the developed technique was proved during two experiments: a clinical study based on vitiligo and melasma skin lesions and a skin oxygenation experiment (induced ischemia) with healthy participant where normal tissues are recorded at normal state and when temporary ischemia is induced.

show abstract

“…Since a bruise goes through several clearly visible color changes, optical techniques would be a first choice. Reflectance spectroscopy has been used for similar purposes e. g. diagnosis of port-wine stains and bilirubinometry [5,6,7,8,9]. Bohnert et al [10] used reflectance spectroscopy to study the depth and color of contusions post mortem.…”

Section: Introductionmentioning

confidence: 99%

Optical classification of bruises

et al. 2004

View full text Add to dashboard Cite

Determining the age of injuries is an important aspect of forensic medicine. Currently, visual inspection and colorimetric measurements are the most common techniques used to assess the age of bruises on a victim's body. Bruises are caused by trauma to the skin and vasculature, and the color will depend on the age, depth, and anatomic site of the hemorrhage. Breakdown products of hemoglobin e. g. biliverdin and bilirubin possess various colors, which can be determined spectrometrically. This study presents reflection spectra collected from bruises in otherwise healthy subjects. A total of 73 spectra of 25 bruises were measured on 13 individuals in the 400 -850 nm wavelength region. All injuries were caused by sports activities such as judo and soccer. The bruises were classified according to visual appearance, bilirubin content, oxygenation, and age of injury. Only bruises with known age and cause were included in the study. Spectral changes of each hematoma were recorded over several days. Preliminary results show large variation in the spectra, caused by differences in age and depth of the bruises. This data may provide a basis for developing an algorithm to determine the age of injuries in e. g. child abuse cases.

show abstract

Skin pigmentation characterized by visible reflectance measurements

Cited by 22 publications

References 24 publications

Retrieval of optical properties of skin from measurement and modeling the diffuse reflectance

Retrieval of optical properties of skin from measurement and modeling the diffuse reflectance

Skin Parameter Map Retrieval from a Dedicated Multispectral Imaging System Applied to Dermatology/Cosmetology

Optical classification of bruises

Contact Info

Product

Resources

About