Evaluation of cross-polarized near infrared hyperspectral imaging for early detection of dental caries

Usenik, Peter; Bürmen, Miran; Fidler, Aleš; Pernuš, Franjo; Likar, Boštjan

doi:10.1117/12.908763

Cited by 12 publications

(6 citation statements)

References 12 publications

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“…42,57,96 Te-cooled InGaAs photodiode arrays are utilized in order to minimize dark noise. 57 HgCdTe detectors covering both MWIR have been employed in cancer diagnosis, 71 lymph node imaging, 68 and assessment of homogeneity distribution in oral pharmaceutical solid dosage forms. 56 Intensified CCD and electron multiplying CCD.…”

Section: Detector Arraysmentioning

confidence: 99%

“…45 Therefore, HSI is increasingly being used for medical diagnosis and image-guided surgery. For example, HSI has been applied to the diagnosis of hemorrhagic shock, 40,150 the assessment of peripheral artery disease, 151 early detection of dental caries, 57 fast characterization of kidney stone types, 96 detection of laryngeal disorders, 53 and so on. In the following section, we focus on the applications of HSI to cancer, cardiac disease, retinal disease, diabetic foot, shock, tissue pathology, and image-guided surgery.…”

Section: Medical Applicationsmentioning

confidence: 99%

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Medical hyperspectral imaging: a review

2014

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Hyperspectral imaging (HSI) is an emerging imaging modality for medical applications, especially in disease diagnosis and image-guided surgery. HSI acquires a three-dimensional dataset called hypercube, with two spatial dimensions and one spectral dimension. Spatially resolved spectral imaging obtained by HSI provides diagnostic information about the tissue physiology, morphology, and composition. This review paper presents an overview of the literature on medical hyperspectral imaging technology and its applications. The aim of the survey is threefold: an introduction for those new to the field, an overview for those working in the field, and a reference for those searching for literature on a specific application.

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Section: Detector Arraysmentioning

confidence: 99%

Section: Medical Applicationsmentioning

confidence: 99%

Medical hyperspectral imaging: a review

2014

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“…More recently, cross-polarized imaging systems have been proposed to improve the contrast in images 11 and promising results have been reported for these systems in the presence of glossy targets. [12][13][14] However, theétendue efficiency has not been taken into consideration in these studies.…”

Section: Introductionmentioning

confidence: 98%

A cross-polarized freeform illumination design for glare reduction in fruit quality inspection

et al. 2015

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Common illumination systems in short wave infrared (SWIR) hyperspectral imaging (HSI) include direct or indirect tungsten halogen lights. While direct lights provide more radiation onto the samples than dome setups, thus being more energy efficient, the acquired images often suffer from specular reflections and gloss. Glare artifacts in images increase variability in the data limiting the accuracy of machine vision algorithms for defect detection and quality inspection, or even providing false positives. Although domes are known to provide a near Lambertian illumination and glare free images, glossy regions and heterogeneities may remain in the data in practice. More particularly, in the field of fruit and vegetable quality inspection, due to their waxy surface, it remains challenging to design an efficient realistic lighting system. This paper suggests a new approach to optimize the illumination of fruit and vegetables based on measurements of the bidirectional reflectance distribution function (BRDF), shape and Stokes parameters. From these measured values, a BRDF model is loaded into ray-tracing software for realistic illumination engineering in order to determine the most suitable illumination scheme. This concept is applied to apples and a cross polarizer (CP) with freeform optics (FO) optical configuration is proposed, which allows the FO to be optimized to maximize uniformity in the field of view of the imager and removes the parallel polarized gloss on the apples. The performance of this CP illumination system was determined experimentally for a set of apples. This cross polarized (CP) illumination system provided a uniformity (U) of 92% and an efficiency (ν) of 90%, while U = 87% and ν = 14% for an ideal dome configuration when illuminating a rectangular target. The simulated imaged apples with assigned optical properties performed better with CP (U=80%) than when using a dome (U=73%) by 7%. Finally, the sensitivity of the design for the light positioning and spectral tolerance are investigated.

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“…For this reason, hyperspectral imaging has found many applications in different fields in recent years. The medical field is one of the main areas where hyperspectral imaging has shown great potential [1], with several studies demonstrating using hyperspectral imaging in detecting cancer [2,3], monitoring ischemia [4], detecting dental caries [5], and guided surgery [6]. Other areas of application include industrial sorting [7], agriculture [8], and security [9].…”

Section: Introductionmentioning

confidence: 99%

Spatial scanning hyperspectral imaging combining a rotating slit with a Dove prism

Abdo¹,

Badilita²,

Korvink³

2019

Opt. Express

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We present a new concept for spatial scanning hyperspectral imaging. Spatial scanning is one of the main methods used for hyperspectral data acquisition and can provide high spectral resolution over a wide spectral range. However, conventional techniques, such as the whiskbroom and the pushbroom techniques, suffer from the need for relative motion between the target and the imaging system, which increases the complexity on the hardware side and limits the application possibilities. Our new approach combines a rotating slit and a co-rotating Dove prism. The rotating slit scans the target image by selecting one line from the image at each angular position of the slit. The rotating Dove prism is used to synchronously realign the transmitted light from the selected image line with respect to the transmission grating to allow the projection of the diffracted light over the same range of pixel columns of the image sensor to facilitate data acquisition and extraction of spectral information. The new approach enables the spatial scanning of the target image without the need for relative linear motion or the use of additional external equipment and therefore opens the door for more application scenarios.

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Evaluation of cross-polarized near infrared hyperspectral imaging for early detection of dental caries

Cited by 12 publications

References 12 publications

Medical hyperspectral imaging: a review

Medical hyperspectral imaging: a review

A cross-polarized freeform illumination design for glare reduction in fruit quality inspection

Spatial scanning hyperspectral imaging combining a rotating slit with a Dove prism

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