Spatially resolved diffuse reflectance in the visible and near-infrared wavelength range for non-destructive quality assessment of ‘Braeburn’ apples

Trong, Nghia Nguyen Do; Erkinbaev, Chyngyz; Tsuta, Mizuki; Baerdemaeker, Josse De; Nicolaı̈, Bart; Saeys, Wouter

doi:10.1016/j.postharvbio.2013.12.004

Cited by 78 publications

(32 citation statements)

References 33 publications

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“…4(a) (skin sample) shows that Iθ − b −2∕3 is linearly related to cos θ as predicted in Eq. (15). In contrast, the data related to Fig.…”

Section: B Use Of Predefined Scattering Phase Functionsmentioning

confidence: 83%

“…Another important point is that the light must travel through a thin skin layer before reaching the apple flesh and re-emerging from the tissue-air boundary. Because the skin has different optical properties with respect to those of the flesh [14], reflectance measurements may be influenced, especially for short source-detector distances [15]. A correct interpretation of measured reflectance signals requires the use of the radiative transfer equation (RTE) [2,3] to model light propagation in the fruit, still considering μ a , μ s , and pθ of each tissue type.…”

Section: Introductionmentioning

confidence: 99%

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Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples

2016

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Knowledge of the optical properties of apple tissues such as skin and flesh is essential to better understand the light-tissue interaction process and to apply optical methods for apple quality inspection. This work aimed at estimating the anisotropy factor of thin skin and flesh samples extracted from three apple cultivars. The scattering-angular light distribution in each tissue sample was measured at four wavelengths (λ=633, 763, 784, and 852 nm), by means of a goniometer setup. Based on the recorded angular intensity I(θ,λ), the effective anisotropy factor g_eff of each tissue type was first estimated using the mean statistics applied to the random variable cos θ. Next, the measured data were fitted with three predefined and modified phase functions-Henyey-Greenstein (p_MHG), Gegenbauer kernel (p_MGK), and Mie (p_Mie)-in order to retrieve the corresponding anisotropy factors g_MHG, g_MGK, and g_MMie. Typically, the anisotropy factors of skin and flesh amount to 0.6-0.8 in the above-mentioned wavelength range.

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“…4(a) (skin sample) shows that Iθ − b −2∕3 is linearly related to cos θ as predicted in Eq. (15). In contrast, the data related to Fig.…”

Section: B Use Of Predefined Scattering Phase Functionsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples

2016

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“…The GNR were synthesized using the seed-mediated growth method. 16 The GNR present the strongest absorption and scattering properties in the rednear-infrared range (commonly used in DR measurements due to a better penetration of light into the tissue 17 ), rather than GNS or gold nanoshells. 18 GNS were prepared using sodium citrate, according to Enüstun and Turkevich.…”

Section: Fabrication Of Gnpmentioning

confidence: 99%

Detection of gold nanorods uptake by macrophages using scattering analyses combined with diffusion reflection measurements as a potential tool for in vivo atherosclerosis tracking

Ankri¹,

Melzer²,

Tárnok³

et al. 2015

IJN

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In this study, we report a potential noninvasive technique for the detection of vulnerable plaques using scatter analyses with flow cytometry (FCM) method combined with the diffusion reflection (DR) method. The atherosclerotic plaques are commonly divided into two major categories: stable and vulnerable. The vulnerable plaques are rich with inflammatory cells, mostly macrophages (MΦ), which release enzymes that break down collagen in the cap. The detection method is based on uptake of gold nanorods (GNR) by MΦ. The GNR have unique optical properties that enable their detection using the FCM method, based on their scattering properties, and using the DR method, based on their unique absorption properties. This work demonstrates that after GNR labeling of MΦ, 1) the FCM scatter values increased up to 3.7-fold with arbitrary intensity values increasing from 1,110 to 4,100 and 2) the DR slope changed from an average slope of 0.196 (MΦ only) to an average slope of 0.827 (MΦ labeled with GNR) ( P <0.001 for both cases). The combination of FCM and DR measurements provides a potential novel, highly sensitive, and noninvasive method for the identification of atherosclerotic vulnerable plaques, aimed to develop a potential tool for in vivo tracking.

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“…To assess the optical coefficients of each tissue type (skin and flesh), the integrating sphere method [29,36] is well adapted. A non-invasive technique based on the light reflectance such as the meta-modelling [37] (which uses different optical properties of homogeneous intralipid solutions as reference data) does not take into account that the fruits have a multilayered tissue structure. Moreover, the inverse method applied to a two-layer diffusion model [38] is not available at proximity of the source, because the diffusion approximation fails for small source-detector distances.…”

Section: Introductionmentioning

confidence: 99%

Light source distribution and scattering phase function influence light transport in diffuse multi-layered media

Vaudelle

L’Huillier

Askoura

2017

Optics Communications

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Red and near-Infrared light is often used as a useful diagnostic and imaging probe for highly scattering media such as biological tissues, fruits and vegetables. Part of diffusively reflected light gives interesting information related to the tissue subsurface, whereas light recorded at further distances may probe deeper into the interrogated turbid tissues. However, modelling diffusive events occurring at short source-detector distances requires to consider both the distribution of the light sources and the scattering phase functions. In this report, a modified Monte Carlo model is used to compute light transport in curved and multi-layered tissue samples which are covered with a thin and highly diffusing tissue layer. Different light source distributions (ballistic, diffuse or Lambertian) are tested with specific scattering phase functions (modified or not modified Henyey-Greenstein, Gegenbauer and Mie) to compute the amount of backscattered and transmitted light in apple and human skin structures. Comparisons between simulation results and experiments carried out with a multi-spectral imaging setup confirm the soundness of the theoretical strategy and may explain the role of the skin on light transport in whole and half-cut apples. Other computational results show that a Lambertian source distribution combined with a Henyey-Greenstein phase function provides a higher photon density in the stratum corneum than in the upper dermis layer. Furthermore, it is also shown that the scattering phase function may affect the shape and the magnitude of the Bidirectional Reflectance Distribution (BRDF) exhibited at the skin surface.

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Spatially resolved diffuse reflectance in the visible and near-infrared wavelength range for non-destructive quality assessment of ‘Braeburn’ apples

Cited by 78 publications

References 33 publications

Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples

Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples

Detection of gold nanorods uptake by macrophages using scattering analyses combined with diffusion reflection measurements as a potential tool for in vivo atherosclerosis tracking

Light source distribution and scattering phase function influence light transport in diffuse multi-layered media

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