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Browsing by Author "Singh, A"

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Celebrating the Year of Light….. from medicine to security with Optical Coherence Tomography

Author: Singh, A ; Sharma, Ameeth ; Roberts, T ; Khutlang, Rethabile ; Ramokolo, Lesiba R ; Marome, N ; Webb, L ; Botha, N ; Karsten, A ; Strauss, Hencharl J Date: Oct 2015 This poster Celebrating the Year of Light….. from medicine to security with Optical Coherence Tomography was presented at the CSIR’s 5th Conference, 8-9 October 2015. Read more
Comparative attenuation spectra of liquid skin-like phantoms

Author: Singh, A ; Smit, Jacoba E ; Karsten, AE ; Grobler, AF ; Sparrow, RW Date: Sep 2010 This study aims to extract and compare attenuation coefficients of different liquid skin-like phantoms representing Skin Types 1 to V1 with two methods, Spectrophotometric and Integrating Sphere methods. The correlation between the results ... Read more
Comparison CCEM-K8 of DC voltage ratio: results

Author: Marullo-Reedtz, G ; Cerri, R ; Blanc, I ; Gunnarsson, O ; Williams, J ; Raso, F ; Kim, KT ; Frenkel, RB ; Zhang, XZ ; Katkov, AS ; Dziuba, R ; Parker, M ; Wood, BM ; Christian, LA ; Tarnow, E ; Mahajan, SK ; Singh, A ; Sakamoto, Y Date: Apr 2003 This article discusses the outcome of DC voltage ratio comparison CCEM-K8 that was participated by fifteen National Metrology Institutes. The need for a key comparison of DC voltage ratio was recognized by the Comite’ International d’electricite’ ... Read more
Comparison of the accuracy of the calibration model on the double and single integrating sphere systems

Author: Singh, A ; Karsten, A Date: May 2011 The accuracy of the calibration model for the single and double integrating sphere systems are compared for a white light system. A calibration model is created from a matrix of samples with known absorption and reduced scattering coefficients. ... Read more
Determination of optical properties of tissue and other bio-materials

Author: Singh, A ; Karsten, AE ; Dam, JS Date: Nov 2008 The optical properties namely the absorption and reduced scattering coefficients of porcine skin were determined using an integrating sphere setup and a multiple polynomial regression method. The absorption coefficient was found to be 0.44±0.06 ... Read more
Determination of the optical properties of PNIPAAm gels used in biological applications

Author: Singh, A ; Karsten, AE ; Mputle, I ; Chetty, A ; Naidoo, Kersch Date: Jul 2009 Poly(N-isopropylacrylamide) that is PNIPAAm is a temperature sensitive smart material which displays a lower critical solution temperature (LCST) at 33-35oC. At the lower critical solution temperature, the gel changes from hydrophilic to ... Read more
Determination of the optical properties of rat tissue

Author: Singh, A ; Karsten, AE ; Smith, RM Date: Jan 2010 Non-invasive methods offer a great advantage over more conventional medical methods but many studies need to be done before such methods become easily accessible and usable. Many of these non-invasive methods are dependant on the interaction ... Read more
Effect of skin tumor properties on laser penetration

Author: Karsten, AE ; Singh, A Date: Jun 2009 Computer modeling can be a valuable tool to determine the absorption of laser light in different skin layers. For this study, the optical properties of three different skin tumors were used in the model to evaluate the effect on penetration ... Read more
Experimental phantom verification studies for simulations of light interactions with skin: liquid phantoms

Author: Karsten, A ; Singh, A ; Almonem, SA Date: Sep 2010 Raytracing computer models are valuable tools to determine the fluence at a specific depth into issue, but need to be verified before they can be used with confidence. Such a model for skin showed good agreement (within 10%) when compared ... Read more
Experimental verification and validation of a computer model for light–tissue interaction

Author: Karsten, AE ; Singh, A ; Braun, MW Date: Apr 2011 Laser light is frequently used in both diagnostics and treatment of patients. For any laser treatment to be effective it is important to deliver the correct dose at the treatment site. Human skin scatters and absorbs laser light in the visible ... Read more
Fingerprint matching with optical coherence tomography

Author: Moolla, Yaseen ; Singh, A ; Saith, E ; Akhoury, S Date: Dec 2015 Fingerprint recognition is an important security technique with a steadily growing usage for the identification and verification of individuals. However, current fingerprint acquisition systems have certain disadvantages, which include the ... Read more
Integrating sphere-based setup as an accurate system for optical properties measurements

Author: Abdalmonem, S ; Harith, MA ; Amin, RM ; Karsten, A ; Singh, A Date: Sep 2010 Determination of the optical properties of solid and liquid samples has great importance. Since the integrating sphere-based setup is used to measure the amount of reflected and transmitted light by the examined samples, optical properties ... Read more
Measurement of diffuse and specular reflections through single cell layers

Author: Karsten, AE ; Dam, JS ; Singh, A Date: Jul 2006 The poster includes the background of biophotonics group; determination of tissue optical properties; optical properties, diagnostic window, scattering elements and integrating sphere measurements; experimental techniques; phantom and cells; ... Read more
Optical coherence tomography as a diagnostic tool

Author: Singh, A ; Karsten, AE Date: Jul 2011 Optical Coherence Tomography (OCT) has been used in biomedical applications as a method to non-invasively detect changes occurring in tissue such as the detection of skin cancer. The effect of skin tone on detection of skin cancer has however ... Read more
Optical coherence tomography as a research tool for biomaterials

Author: Karsten, AE ; Singh, A ; Ndhundhuma, I Date: Jan 2010 In this study a commercial FD-OCT (Model OCM1300SS) by Thorlabs Inc., USA was used. This system has the following performance specifications: 1300nm centre operating wavelength, a 110nm 3dB spectral bandwidth, transverse spatial air resolution ... Read more
Phantom skin absorption coefficients from spectrophotometric and integrating sphere methods: preliminary comparative results

Author: Smit, Jacoba E ; Singh, A ; Tshoke, I ; Grobler, AF ; Sparrow, RW Date: Dec 2010 Minimalistic or non-invasive diagnosis and treatment of skin disorders requires accurate information regarding skin optical properties. Spectrophotometric and Integrating Sphere (IS) methods are commonly used to extract information regarding ... Read more
Quantifying the influence of the epidermal optical properties on laser treatment parameters

Author: Karsten, AE ; Singh, A Date: May 2013 Laser based treatment modalities offer patients a less invasive, often localised treatment method. This has advantages of faster healing times and fewer side effects from treatment. For most laser treatments though the target site is some ... Read more
Resin phantoms as skin simulating layers

Author: Karsten, AE ; Singh, A ; Ndhundhuma, IM Date: Jul 2011 In order to apply light treatment to skin, the absorption through the outer layers of the skin needs to be considered. Darker skin has a higher concentration of melanin in the epidermis and absorbs more light than fair skin. Ideally the effect ... Read more
Robustness and accuracy of the calibration model for the determination of the optical properties of chicken skin

Author: Singh, A ; Karsten, AE ; Dam, JS Date: Oct 2008 The optical properties namely the absorption and reduced scattering coefficients of chicken skin taken from the breast was measured using an Integrating Sphere setup at 632.8nm. The properties were extracted using the multiple regression ... Read more
Segmentation of forensic latent fingerprint images lifted contact-less from planar surfaces with optical cohererence tomography

Author: Khutlang, Rethabile ; Nelwamondo, Fulufhelo V ; Singh, A Date: Jul 2015 Lifting latent fingerprints through means that do not make contact with the surface where the fingerprint is imprinted, is advantageous in many ways. Some of these advantages include: being able to lift the print multiple times; there is no ... Read more

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