Integration of image exposure time into a modified laser speckle imaging method

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.

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Improving the estimation of flow speed for laser speckle imaging with single exposure time

Optics Letters ◽

10.1364/ol.42.000057 ◽

2016 ◽

Vol 42 (1) ◽

pp. 57 ◽

Cited By ~ 7

Author(s):

Yang Wang ◽

Dong Wen ◽

Xiao Chen ◽

Qin Huang ◽

Ming Chen ◽

...

Keyword(s):

Exposure Time ◽

Flow Speed ◽

Laser Speckle ◽

Single Exposure ◽

Laser Speckle Imaging ◽

Speckle Imaging

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TRACING COLLATERAL CIRCULATION AFTER ISCHEMIA IN RAT CORTEX BY LASER SPECKLE IMAGING

Journal of Innovative Optical Health Sciences ◽

10.1142/s1793545808000121 ◽

2008 ◽

Vol 01 (02) ◽

pp. 217-226 ◽

Cited By ~ 8

Author(s):

WEIHUA LUO ◽

PENGCHENG LI ◽

ZHEN WANG ◽

SHAOQUN ZENG ◽

QINGMING LUO

Keyword(s):

Blood Flow ◽

Middle Cerebral Artery ◽

Cerebral Artery ◽

Collateral Circulation ◽

Laser Speckle ◽

Imaging Method ◽

Spatiotemporal Resolution ◽

Laser Speckle Imaging ◽

Speckle Imaging ◽

Rat Cortex

The collateral circulation is crucial for the pathophysiology and outcome of acute cortical ischemia. Current understanding of collateral circulation still remains sparse, largely due to prior limitations of spatial or/and temporal resolution in methods to evaluate these diminutive redistributive routes of cerebral blood flow (CBF) especially in leptomeningeal anastomoses that connected cortical arteries. In the study, based on a mini-stroke model, laser speckle imaging with high spatiotemporal resolution was used to assess the dynamic evolution of the collateral circulation around a mini-ischemia in the rat cortex. We found that the blood flow and diameter in the intra-arterial anastomoses were enhanced immediately after the ligation of one branch of middle cerebral artery and recovered to baseline level as arterial recirculation was performed. Whereas the communicative flow-through of the posterior cerebral artery and the middle cerebral artery anastomoses was not significant enough to be determined. This is the evidence that intra-arterial anastomoses were the primary routes to restore blood flow into the ischemic territory during the acute phase of ischemia, and laser speckle imaging method was proven as a powerful tool to be potential for subserving further investigation of the collateral circulation.

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