A comparison of four different imaging modalities – Conventional, cross polarized, infra-red and ultra-violet in the assessment of childhood bruising

Trefán, László; Harris, Ciara; Evans, Samuel Lewin; Nuttall, Diane; Maguire, Sabine; Kemp, Alison

doi:10.1016/j.jflm.2018.07.015

Cited by 16 publications

(12 citation statements)

References 32 publications

(40 reference statements)

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“…From this point on, the PBS output rays become vertically polarised. 6) PBS to divide the input beam into two orthogonal photon rays; (7,11,13) mirrors to control the optical paths; (8) half-wave plate to rotate the polarisation of the beam reflected by the splitter; (9) AOTF cell to diffract the selected spectral bands; (12,15) CMOS sensors to detect the captured photons propagating along the dual paths.…”

Section: Methodsmentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14] Nevertheless, the valuable information of HSI might disguise evidence of the presence of some species in a heterogeneous environment. 11,15,16 For such cases, a piece of auxiliary information might improve identification. One approach, for identification of paradoxes, is the polarisation preference for an object (the polarisation preference of an object means that this object gives maximum display when the incident light is polarised and its polarisation direction matches its preference).…”

Section: Introductionmentioning

confidence: 99%

“…Figure1. The developed AOTF dual-path imaging spectrometer schematic diagram includes: (1, 2) two halogen sources adapted to emit linearly polarised light;(3,5,10,14) lenses used to collect, collimate and focus the captured optical input; (4) square aperture to limit the size of the optical beam; (6) PBS to divide the input beam into two orthogonal photon rays;(7,11,13) mirrors to control the optical paths; (8) half-wave plate to rotate the polarisation of the beam reflected by the splitter; (9) AOTF cell to diffract the selected spectral bands;(12,15) CMOS sensors to detect the captured photons propagating along the dual paths.…”

mentioning

confidence: 99%

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A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

Abdlaty

Fang

2020

J. Spectral Imaging

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It is highly demanding to identify healthy and non-healthy species in a heterogeneous environment such as human tissues. In such a case, one identifier, such as a spectral fingerprint, might be inadequate. Therefore, additional identification is required, for instance, a polarisation measurement. In view of that, the development of a spectropolarimeter that captures two cross-polarised arrays of spectral images is a key requirement. To meet this requirement, an imager optical setup has been designed to provide spatial, spectral and polarisation preference information for species that exist in a heterogeneous environment, such as in medical tissue samples. The spectral and polarisation information is obtained employing an acousto-optic tunable filter and a polarising beam splitter, respectively. The optical imager is designed to operate in the visible-near infrared range (450–850 nm) with a spectral resolution of 3 nm. The spectropolarimeter design along with optical characterisation results are reported.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

Abdlaty

Fang

2020

J. Spectral Imaging

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“…A great advantage of HSI is providing a spectral identity for every single pixel enclosed in the field of view. For that advantage, HSI finds application in divergent fields of research such as in agriculture, 20,21 nutrients production, 22,23 space science, 15 forensic medicine 24 and health science. [25][26][27][28] To the best of our knowledge, there has been no report in the literature of the use of HSI for quantitative chemical analysis on-site.…”

Section: Introductionmentioning

confidence: 99%

Innovative technique for analysis of wastewater contaminants using hyperspectral imaging

Abdlaty

Gobara

Naiem

et al. 2020

J. Spectral Imaging

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Accurate, fast, quantitative on-site analysis of wastewater is an environmental necessity. Therefore, we report a quantitative spectroscopic study in order to analyse organic contaminants in wastewater. For this purpose, two spectroscopy-based techniques were utilised and their results are compared. The first technique is ultraviolet/visible (UV/vis) spectrophotometry. This technique is a standard laboratory technique, however, it is inappropriate for working in the field. Besides, the analysis results of the standard laboratory technique display low accuracy in detecting small concentrations of wastewater contaminants such as methylene blue (< 20 ppm). Accordingly, there is a need for another technique to overcome the shortcomings of UV/vis spectrophotometry. Hyperspectral imaging (HSI) combines imaging and spectrometry. HSI works on-site since it is portable and easy to operate. The analysis of the data acquired by HSI showed a higher efficacy in accurately detecting both low (< 20 ppm) and high concentrations (> 50 ppm) of water contaminants such as methylene blue and methyl orange. For verification, Pearson correlation coefficients were computed between the concentration of contaminants and their absorbance for all the operating spectral bands. The results of the two techniques were statistically compared using Bland and Altman’s limit of agreement. This study showed that HSI is potentially a promising technique for the analysis of wastewater contaminants on-site.

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“…Crime scene recording, recording of injuries, identification, interpretation of injuries and detecting clandestine grave sites are few. 5,6 In many parts of the world, forensic photography is a part of police investigation conducted by trained police officers/ trained photographers.…”

Section: Introductionmentioning

confidence: 99%

Usage of digital photographs in forensic work in Sri Lanka

Nadeera¹,

Edirisinghe

Kitulwatte

2018

Sri Lanka J Forensic Med, Sci & Law

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Forensic photography refers to making of images to record objects, scenes and events to be used in the legal process. With popularization of digital cameras, forensic photography is being increasingly used as a tool in record keeping as well as evidence. The objective of this study was to evaluate available facilities and current practice of using digital photographs in forensic work by medico-legal doctors in Sri Lanka. A cross sectional descriptive study was conducted using a self-administered questionnaire among doctors engaged in forensic work in Sri Lanka. The study was conducted as an on-line survey from October 2018. Out of 102 doctors who participated in the survey, 51% (n=52) used camera-phones instead of DSLR cameras to take forensic photographs, although 72% (73) had a DSLR camera in the institution. The majority (96%) used a measuring scale in their photographs, but only 43% used a colour scale. 66% took more than two photographs for a single injury but only 26% used an external light source. 80% took photographs in all magisterial autopsies but only 48% incorporated them in their reports. Majority (74%) knew that forensic photographs are admissible in courts. Basic technical knowledge of functions of a camera was poor in a majority (85%) of doctors. Although basic technical knowledge of photography was poor in doctors engaged in medicolegal practice, many use photographs to compliment autopsy reports. Since comprehension of events using visual images is better than verbal descriptions, improving the quality of photographs submitted to courts should be the way forward. Therefore, forensic photography training should be encouraged.

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A comparison of four different imaging modalities – Conventional, cross polarized, infra-red and ultra-violet in the assessment of childhood bruising

Cited by 16 publications

References 32 publications

A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

Innovative technique for analysis of wastewater contaminants using hyperspectral imaging

Usage of digital photographs in forensic work in Sri Lanka

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