Sökning: "biomedical optics"

Hittade 5 uppsatser innehållade orden biomedical optics.

1. 1. Venous Component Separation From a Pulse Oximeter Signal using Blind Source Separation with Ultrasound Imaging as Reference

   Master-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

   Författare :Björn Walter; Stefan Piiroinen; [2021]
   Nyckelord :Photoplethysmogram; PPG; Ultrasound; Blind Source Separation; PCA; SOBI; venous component; Technology and Engineering;

   Sammanfattning : Intradialytic hypotension (IDH) is a major drawback of haemodialysis and occurs in more than every fifth dialysis treatment. There is a need for real-time measurement, with an ability to detect IDH before it occurs. Photoplethysmography (PPG) may provide sufficient information about hemodynamic status to prevent IDH. LÄS MER

3. 2. Diffuse correlation spectroscopy for estimation of coagulation thickness : a phantom study

   Master-uppsats, Linköpings universitet/Institutionen för medicinsk teknik

   Författare :Zeyneb Alsadi; [2019]
   Nyckelord :DCS; Diffuse correlation spectroscopy; Biomedical optics; coagulation; phantom study; coagulation depth; coagulation thickness; diffusion; model; two layer model;

   Sammanfattning : The objective of this preliminary study was to determine the potential of diffuse correlation spectroscopy (DCS) for assessment of coagulation depth. Coagulation of tissue can occur due to a number of different reasons such as thermal or electrical burns or radiofrequency ablation. LÄS MER

4. 3. Evaluation of white-light generation as possible seed for a mid-infrared optical parametric chirped pulse amplifier

   Master-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Kärnfysik

   Författare :Chuang Lu; [2017]
   Nyckelord :nonlinear linear optics; ultrafast optics; Mid-infrared generation; near-infrared; Optical parametric amplification; Optical Parametric Chirped-pulse Amplification; supercontinuum generation; white-light generation; laser induced filamentation; Dispersion-scan; nonlinear propagation; Physics and Astronomy;

   Sammanfattning : White-light spectra of different crystals, based on 1030-nm intense pump pulses have been investigated in order to derive a near-infrared seed for mid-infrared generation. Among ten crystals, YAG (yttrium aluminium garnet), KGW (potassium gadolinium tungstate) and YVO4 (yttrium orthovanadate) exhibit the most suitable properties for supercontinuum generation with high efficiency for spectral broadening as well as high tolerance to optical damage. LÄS MER

5. 4. Hardware Control of a Near Infrared Fluorescence System : LabVIEW Programming and Evaluation

   Master-uppsats, Linköpings universitet/Biomedicinsk instrumentteknik

   Författare :María Martha de la Paz Velasco Santoscoy; [2016]
   Nyckelord :Near-infrared; indocyanine green ICG ; biomedical optics; fluorescence; spectroscopy; lasers.;

   Sammanfattning : Indocyanine green (ICG) is a fluorescent dye used as an indicator in medicine and surgery. The maximum absorption wavelength of ICG is at 785 nm, while the maximum emission is around 820 nm. ICG is nontoxic and is rapidly excreted into the bile. LÄS MER

7. 5. Hyperspectral Image Analysis Algorithm for Characterizing Human Tissue

   Master-uppsats, Biomedicinsk instrumentteknik; Tekniska högskolan

   Författare :Yonas kassaw Wondim; [2011]
   Nyckelord :Hyper spectral image analysis; GPU programming; Bio optics; CUDA programming; Göran Salerud; Marcus Larsson; Yonas Kassaw; Yonas K. Wondim; Non negative Least square analysis; tissue oxygenation; melanin concentration; Ethiopia; Debub University; Linköping University; Ethiopians in Sweden;

   Sammanfattning : AbstractIn the field of Biomedical Optics measurement of tissue optical properties, like absorption, scattering, and reduced scattering coefficient, has gained importance for therapeutic and diagnostic applications. Accuracy in determining the optical properties is of vital importance to quantitatively determine chromophores in tissue. LÄS MER