0000000000513548
AUTHOR
Alise Aglinska
Remote photoplethysmography for skin perfusion monitoring using narrowband illumination
The purpose of this study was to determine potential of remote photoplethysmography for skin perfusion monitoring, using 540 nm narrowband and 530 nm broadband illuminations. The alterations of cutaneous circulation were produced by topical skin heating protocol. The setup comprises of 530 nm LED light source and two identical cameras operated simultaneously: one equipped with narrowband optical filter (CWL=540nm), and another without filter. Results demonstrate the typical heating test response curve- comprising first peak, nadir and plato phase, which were significantly different in narrowband and broadband illumination. It was concluded that selection of optimal light source parameters i…
Ādas vazomotorā aksonrefleksa novērtējums, izmantojot bezkontakta fotopletizmogrāfijas metodi
Bakalaura darba “Ādas vazomotorā aksonrefleksa novērtējums, izmantojot bezkontakta fotopletizmogrāfijas metodi” mērķis ir izvērtēt bezkontakta fotopletizmogrāfijas iespējas matainās ādas vietējās sildīšanas izraisīto vazomotoro reakciju kvantitatīvajā novērtēšanā. Pētījumā piedalījās 13 brīvprātīgie, kas bija klīniski veseli un bez kaitīgiem ieradumiem. Mērījums noritēja, sildot uz plaukstas virspuses novietotu sildelementu, kas atradās starp kontroles un EMLA krēma anestezēto zonu. Video ieraksts notika 20 minūtes – pirmajā minūtē sildot ādu 32°C temperatūrā, bet pārējās 19 minūtes 42°C temperatūrā. Video fotopletizmogrāfiskais signāls no kontroles un EMLA zonas tika analizēts custom-made …
Imaging photoplethysmography for evaluation of cutaneous sensory nerve fiber function
Peripheral neuropathy refers to peripheral nervous system dysfunction which affects up to 2% of the world's population. This condition is caused by damage to the small nerve fibers, hence its assessment is still challenging due to the lack of simple, non-invasive and objective diagnostic techniques. The present study aimed to develop and evaluate a simple, objective and non-invasive technique for assessment of small cutaneous sensory nerve fiber function. Our approach is based on utilization of imaging photoplethysmography and local skin heating. The effectiveness of the method was evaluated on young, healthy volunteers (n = 14) after 10 minutes of 45-degree local skin heating, while record…
Remote Photoplethysmography for Evaluation of Cutaneous Sensory Nerve Fiber Function
About 2% of the world’s population suffers from small nerve fiber dysfunction, neuropathy, which can result in severe pain. This condition is caused by damage to the small nerve fibers and its assessment is challenging, due to the lack of simple and objective diagnostic techniques. The present study aimed to develop a contactless photoplethysmography system using simple instrumentation, for objective and non-invasive assessment of small cutaneous sensory nerve fiber function. The approach is based on the use of contactless photoplethysmography for the characterization of skin flowmotions and topical heating evoked vasomotor responses. The feasibility of the technique was evaluated on volunt…
Multispectral Photophletysmography for Evaluation of Cutaneous Flowmotions
Human skin may reflect health conditions. Important and possibly diagnostically potent components of microcirculation are slow flow oscillations-flowmotions, however there is a lack of studies in this field. The present pilot study was devoted to evaluation of multispectral imaging photoplethysmography in determination of different components of flowmotions. Eight subjects were enrolled for the study. During resting conditions video was captured from dorsal aspect of hand at seven different wavelength and flowmotion analysis performed. Results indicate that at the resting conditions neurogenic component along with endothelial are dominant regardless of wavelength, while myogenic has the low…