Defence and Security

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Browsing Defence and Security by Subject "'absorption properties'"

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    Monte Carlo simulation results for anaemia detection in the skin
    (Cranfield University, 2020-01-20 08:27) Kallepalli, Akhil; James, David
    This research was presented at SPIE Photonics West 2020 (February 2020) with the article titled: Quantification and influence of skin chromophores for remote detection of anemic conditions (https://doi.org/10.1117/12.2545784) Monte Carlo simulations were performed using Virtual Tissue Simulator (VTS) and Monte Carlo Command Line (MCCL) tools. The target was a two-layer model of the epidermis and dermis layers of the skin. The optical attenuation properties quantifying the absorption and scattering in these layers are set according to two parameters: - Amount of melanin in the epidermis - Amount of haemoglobin in the blood-perfused dermis The optical models are simulated at six wavelengths for 6 skin types (Fitzpatrick's scale) and two blood conditions, healthy and anaemic. This results in a total of 72 simulations The simulation calculates the optical interaction of 10 6 photons with the various combinations of optical properties. The resulting outputs show the absorption and fluence in the tissue model, and reflected and transmitted energy.
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    Monte Carlo simulation results for full finger models based on ultrasound image data
    (Cranfield University, 2021-06-02 16:35) Kallepalli, Akhil; James, David; Richardson, Mark
    Monte Carlo simulations were performed using Virtual Tissue Simulator (VTS) and Monte Carlo Command Line (MCCL) tools. The target was a tissue model specific to individual participants, including all anatomical components in a finger. The thickness and depth measurements were ascertained using an 18 MHz ultrasound probe. This implementation is proposed as a low-cost and novel method for patient-specific photo-therapy. The optical models of 12 participants are assessed at four wavelengths of interest. The optical interaction with the tissue layers is calculated with 10 6 photons. The absorption, reflection, fluence and transmission are measured and quantified in the experiments.