Laser Speckle Contrast Analysis (LASCA) for Measuring Blood Flow

Briers, J. D.; McNamara, Paul; O'Connell, Marie Louise; Leahy, Martin J.

doi:10.1002/9783527651238.ch8

Cited by 70 publications

(93 citation statements)

References 58 publications

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“…25 Motions of particles in the illuminated tissue region lead to fluctuations in the speckle pattern on the detector. An image of the speckle is acquired with a camera (localized inside the LSCI imager head) during a certain time interval called exposure time.…”

Section: Lsci Techniquementioning

confidence: 99%

See 1 more Smart Citation

Assessment of Skin Microvascular Function and Dysfunction With Laser Speckle Contrast Imaging

Mahé

Humeau-Heurtier

Durand

et al. 2012

Circ: Cardiovascular Imaging

136

115

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Section: Lsci Techniquementioning

confidence: 99%

“…25,27,28 The level of cutaneous blood flow is subject to systemic, regional, local, and cellular mechanisms (eg, sympathetic activity, local axon reflexes, endothelial function, myogenic tone, metabolic responses). 3,29 There are 2 distinct sympathetic pathways.…”

Section: Cutaneous Microcirculation Pathologies and Dysfunctionmentioning

confidence: 99%

Assessment of Skin Microvascular Function and Dysfunction With Laser Speckle Contrast Imaging

Mahé

Humeau-Heurtier

Durand

et al. 2012

Circ: Cardiovascular Imaging

136

115

View full text Add to dashboard Cite

“…2 In this regard, laser speckle imaging provides a high resolution optical method for monitoring tissue hemodynamics and vessel redistribution. [13][14][15][16] A laser speckle imaging system acquires the mutual interference of a set of wave fronts formed by a laser light casting on tissue and reconstructs the blood perfusion characteristics by laser speckle contrast analysis (LASCA). Thermographic imaging provides indirect information associated with tissue inflammation.…”

Section: Introductionmentioning

confidence: 99%

Multimodal imaging of cutaneous wound tissue

et al. 2015

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Abstract. Quantitative assessment of wound tissue ischemia, perfusion, and inflammation provides critical information for appropriate detection, staging, and treatment of chronic wounds. However, few methods are available for simultaneous assessment of these tissue parameters in a noninvasive and quantitative fashion. We integrated hyperspectral, laser speckle, and thermographic imaging modalities in a single-experimental setup for multimodal assessment of tissue oxygenation, perfusion, and inflammation characteristics. Algorithms were developed for appropriate coregistration between wound images acquired by different imaging modalities at different times. The multimodal wound imaging system was validated in an occlusion experiment, where oxygenation and perfusion maps of a healthy subject's upper extremity were continuously monitored during a postocclusive reactive hyperemia procedure and compared with standard measurements. The system was also tested in a clinical trial where a wound of three millimeters in diameter was introduced on a healthy subject's lower extremity and the healing process was continuously monitored. Our in vivo experiments demonstrated the clinical feasibility of multimodal cutaneous wound imaging.

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“…In [4] the following formula is given: We added a piezoelectric actuator to the illumination setup that imposed an oszillating movement of the laser lines along their axes. The higher the velocity, the lower is the correlation time Ĳ c .…”

Section: Speckle Contrast Reduction By Dynamic Averagingmentioning

confidence: 99%

Speckle reduction for a laser light sectioning sensor

Tutsch

Han

Dierke

2015

MATEC Web of Conferences

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Abstract. Automated optical inspection is an important test procedure in electronic circuits assembly. Frequently 3d information is required and laser light sectioning sensors are often applied. However, some effects complicate the reliable automatic detection of the shape of such assemblies and their components. The packages of electronic components often are made of black plastics or ceramics so that the intensity available for the optical detection is quite low, especially in comparison to the surface of the PCBs where the components are mounted on. In addition due to rough surfaces of the components and the coherence length of the laser light speckle structures arise. In the work presented here a piezo actuator is used to oscillate the illuminating laser lines along the direction of the lines. The aim is to reduce the visibility of the speckle structures by averaging while maintaining the geometrical shape of the lines. In addition, image processing methods like segmentation and skeletonization are used to allow the detection of the shape of components and assemblies also if materials with distinct differences in the reflectivity are involved. Investigations include the influence of the parameters amplitude and frequency of the piezo actuator.

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Laser Speckle Contrast Analysis (LASCA) for Measuring Blood Flow

Cited by 70 publications

References 58 publications

Assessment of Skin Microvascular Function and Dysfunction With Laser Speckle Contrast Imaging

Assessment of Skin Microvascular Function and Dysfunction With Laser Speckle Contrast Imaging

Multimodal imaging of cutaneous wound tissue

Speckle reduction for a laser light sectioning sensor

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