Non-invasive determination of retinal temperature through stimulated laser speckle imaging (sLSI) (Conference Presentation)

2019 ◽  
Author(s):  
Sean J. Kirkpatrick ◽  
Nicolle Sevilla ◽  
Ilyas Saytashev ◽  
Jessica C. Ramella-Roman
Keyword(s):  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Non Invasive

516 Determination of Adequate Debridement of Burn Wounds via Laser Speckle Imaging

2019 ◽  
Vol 40 (Supplement_1) ◽  
pp. S234-S234
Author(s):  
R Stone ◽  
D Larson ◽  
J Wall ◽  
H Dillon ◽  
C Kowalczewski ◽  
...  
Keyword(s):  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Burn Wounds

scholarly journals P164 Can non-invasive techniques be used to image calcinosis?

Rheumatology ◽  
2020 ◽  
Vol 59 (Supplement_2) ◽  
Author(s):  
Tonia L Moore ◽  
Elizabeth Marjanovic ◽  
Joanne B Manning ◽  
Graham Dinsdale ◽  
Sarah Wilkinson ◽  
...  
Keyword(s):  
High Frequency ◽  
Significant Proportion ◽  
Laser Speckle ◽  
Adjacent Area ◽  
High Frequency Ultrasound ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Non Invasive ◽  
Invasive Techniques ◽  
Frequency Ultrasound

Abstract Background A significant proportion of patients with systemic sclerosis (SSc, 20-40%) will develop subcutaneous calcinotic deposits which are painful and can perforate the skin, causing ulceration. The underlying aetiology is unknown and there is currently no effective treatment. Diagnosis is often made with plain radiography, which is not ideal for long-term monitoring. Identifying non-invasive techniques which do not involve ionising radiation will improve our understanding of calcinosis and how to monitor this over time, facilitating the development of potential treatments. The aim of this study was to assess several non-invasive imaging techniques to measure oxygenation (multispectral imaging), perfusion (thermography [a pseudo measure of perfusion] and laser speckle imaging) and size and depth (high frequency ultrasound) of the calcinoses. The hypothesis of the study was that there would be relationships between oxygenation, perfusion and calcinosis size and depth. Methods Twenty-one patients with SSc (all female, median age 63 (IQR 55 to 70) years; disease duration since onset of first non-Raynaud’s feature 14 (9 to 23) years, Raynaud’s phenomenon duration 23 (12- 36) years; underwent imaging of calcinosis. Measurements of oxygenation, perfusion and vessel size and depth were performed at the site of calcinosis and adjacent skin. Results There was no difference in oxygenation at the site of calcinosis vs adjacent median 0.15 (IQR 0.07 to 0.22) vs. 0.16 (0.00 to 0.21) arbitrary units respectively; non-significant. There was a trend for skin temperature (perfusion) to be lower at the site of the calcinosis compared to the adjacent area (calcinosis, 31.4 (28.4 to 35.6) vs adjacent 32.8 (28.4 to 35.7) oC; p = 0.052. Perfusion as measured by speckle imaging was significantly reduced 107.3 [60.3 to 213.4] vs 312.1 [107.8 to 432.2] arbitrary perfusion units; p < 0.01. The mean depth of the calcinoses was 1.5 (1.11 to 2.07) cm and mean lesion area was 3.06 (2.33 to 4.62) cm2. No relationships were identified between perfusion, oxygenation or calcinosis depth and area. Conclusion Perfusion is reduced at the calcinotic sites, as measured by laser speckle imaging and also (although not significantly) as measured indirectly by thermography. That perfusion was decreased in the area of the calcinosis versus the adjacent skin may be due to the pressure on the skin leading to ischaemia, or it may be that calcinosis develops in areas which are under-perfused. This study has demonstrated the feasibility of imaging calcinosis properties. The ability to measure the depth and subcutaneous area with high frequency ultrasound may provide a useful outcome measure of treatment efficacy. Disclosures T.L. Moore None. E. Marjanovic None. J.B. Manning None. G. Dinsdale None. S. Wilkinson None. M.R. Dickinson None. A.L. Herrick None. A.K. Murray None.

scholarly journals ANALISIS KONTRAS SPEKEL UNTUK IDENTIFIKASI LILIN PADA BUAH APEL (Mollus domestica) DENGAN METODE LASER SPECKLE IMAGING (LSI)

1930 ◽  
Vol 8 (01) ◽  
pp. 67-71
Author(s):  
Shabri Putra Wirman ◽  
Neneng Fitrya
Keyword(s):  
Fruit Quality ◽  
Imaging System ◽  
Laser Speckle ◽  
Imaging Method ◽  
Optical Technology ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Post Harvest ◽  
Non Invasive ◽  
Non Destructive

Post-harvest apples are still doing the metabolism process such as respiration and transpiration that lead to decreased fruit quality so that required post-harvest handling, one of them with the waxing process. Wax detection on fruit is difficult to do directly, so further testing is required. One method that can be done is to use optical technology is a speckle imaging system with the LSI (Laser Speckle Imaging) method that is without touching (non-invasive) and without damage (non destructive). The apple contrast value before lamination has a contrast value in the range 0.34637 a.u until 0.38449 a.u. After waxing the apple contrast value decreases. Apples with 4% wax concentration had a contrast value 0.319 a.u, with 6% wax concentration had a contrast value 0.3109 a.u and with 8% wax concentration had a contrast value 0,29895 a.u.

scholarly journals Quantitative, depth-resolved determination of particle motion using multi-exposure, spatial frequency domain laser speckle imaging

2013 ◽  
Vol 4 (12) ◽  
pp. 2880 ◽  
Author(s):  
Tyler B. Rice ◽  
Elliott Kwan ◽  
Carole K. Hayakawa ◽  
Anthony J. Durkin ◽  
Bernard Choi ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Frequency Domain ◽  
Particle Motion ◽  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Spatial Frequency Domain

A comparison of two laser-based methods for determination of burn scar perfusion: Laser Doppler versus laser speckle imaging

Burns ◽  
2005 ◽  
Vol 31 (6) ◽  
pp. 744-752 ◽  
Author(s):  
C.J. Stewart ◽  
R. Frank ◽  
K.R. Forrester ◽  
J. Tulip ◽  
R. Lindsay ◽  
...  
Keyword(s):  
Laser Speckle ◽  
Laser Doppler ◽  
Laser Speckle Imaging ◽  
Speckle Imaging ◽  
Burn Scar

scholarly journals Simple correction factor for laser speckle imaging of flow dynamics

2014 ◽  
Vol 39 (3) ◽  
pp. 678 ◽  
Author(s):  
J. C. Ramirez-San-Juan ◽  
R. Ramos-Garcia ◽  
G. Martinez-Niconoff ◽  
B. Choi
Keyword(s):  
Correction Factor ◽  
Flow Dynamics ◽  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging

Laser speckle imaging reveals bacterial activity within colony

2021 ◽  
Author(s):  
Ilya Balmages ◽  
Janis Liepins ◽  
Dmitrijs Bliznuks ◽  
Stivens Zolins ◽  
Ilze Lihacova ◽  
...  
Keyword(s):  
Bacterial Activity ◽  
Laser Speckle ◽  
Laser Speckle Imaging ◽  
Speckle Imaging
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