&lt;title&gt;Spectrotomography: a new method of obtaining spectrograms of two-dimensional objects&lt;/title&gt;

Bulygin, Theodor V.; Vishnyakov, G. N.

doi:10.1117/12.131904

Cited by 16 publications

(11 citation statements)

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“…CTIS was invented separately by Okamoto, Yamaguchi, Bulygin and Vishnyakov (Okamoto and Yamaguchi, 1991;Bulygin and Vishnyakov, 1992). The setup presented in Fig.…”

Section: Two-dimensional Spectral Cameramentioning

confidence: 99%

“…The observed two-dimensional diffraction pattern can be considered as parallel projections of voxels of a threedimensional object cube. Two dimensions of this threedimensional cube are the spatial coordinates and one dimension is the wavelength (Okamoto and Yamaguchi, 1991;Bulygin and Vishnyakov, 1992). The voxels of the object cube can be denoted as a long serialized vector f .…”

Section: Two-dimensional Spectral Cameramentioning

confidence: 99%

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Development of a highly sensitive spectral camera for cartilage monitoring using fluorescence spectroscopy

Kuehn

Graf

Wenzel

et al. 2015

J. Sens. Sens. Syst.

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Abstract. The Ulm University Medical Center and the Ulm University of Applied Sciences are developing a bioreactor to grow facial cartilage using the methods of tissue engineering. To ensure a sufficient quality of the cartilage prior to implantation, the cartilage growth has to be monitored continuously. Current cartilage analysis methods are destructive so that analysed cartilage sample is no longer suitable for implantation. Alternatively, it seems feasible to analyse cartilage during the cultivation process and before implantation using fluorescence spectroscopy after UV light excitation. This approach is non-invasive and allows an evaluation of the cartilage in terms of composition and quality. Cultured cartilage implants can reach sizes of several square centimetres and therefore it is necessary to examine it over its entire area. For recording fluorescence spectra of different spots of the cartilage sample, a highly sensitive spectral camera is being developed in two steps. The first step is a one-dimensional spectral camera that is able to record fluorescence spectra along a sample line. The second step enables the detection of spectra over the required two-dimensional sample area. This approach is based on computed tomography imaging spectrometry (CTIS) and allows non-invasive distinguishing of the most important cartilage compounds collagen I and collagen II.

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“…CTIS was invented separately by Okamoto, Yamaguchi, Bulygin and Vishnyakov (Okamoto and Yamaguchi, 1991;Bulygin and Vishnyakov, 1992). The setup presented in Fig.…”

Section: Two-dimensional Spectral Cameramentioning

confidence: 99%

Section: Two-dimensional Spectral Cameramentioning

confidence: 99%

Development of a highly sensitive spectral camera for cartilage monitoring using fluorescence spectroscopy

Kuehn

Graf

Wenzel

et al. 2015

J. Sens. Sens. Syst.

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“…2 represents the condition of only one AMSI configuration, it illustrates features that are generally true for these exotic spectral imagers [1,2,3,4,8]. The low-spatial frequency matrices tend to be ill-conditioned, while the zero spatial frequency matrix is singular.…”

Section: A More Formal Mathematical Developmentmentioning

confidence: 96%

“…A series of prisms of varying dispersion sequentially placed in the optical path is the spectral imaging approach described in [1]. This approach is conceptually very similar to medical imaging techniques, but it has low efficiency due to the time required to swap dispersive elements.…”

Section: Alternative Disperser Configurationsmentioning

confidence: 99%

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Angularly multiplexed spectral imager

Mooney¹

1995

SPIE Proceedings

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A spectral imager constructs a three dimensional (two spatial and one spectral) image from a series of two dimensional images. This paper discusses a technique for spectral imaging that multiplexes the the spatial and spectral information on the focal plane, then demultiplexes the resulting imagery to obtain the spectral image. The resulting spectral image consists of 184 x 184 spatial pixels and 40 spectral bands. The current implementation operates over the 3-5pmband, but can easily be applied to other spectral regions. A hardware description, the mathematical development and experimental results are presented. BACKGROUNDMost spectral imagers slice the three dimensional image into a sequence of two dimensional images. Two common approaches are: 1) image in the two spatial dimensions while using a sequence of spectral filters to slice in the spectral domain, or 2) image in one spatial and one spectral dimension while scanning a slit over the remaining spatial direction. Each of these approaches are inherently inefficient. In the first case only one color is imaged at a time. If N,, spectral bands are to be imaged, then the efficiency is (1/NA). In the second case only one slit of the scene is imaged at a time. If NxN spatial resolution elements are to be imaged by scanning in the x direction, then the efficiency will be (1/Nr).Color visible CCDs achieve spectral imaging by using dichroic filters such that each pixel detects either red, green or blue light. The efficiency of these devices is at best 1/3, and they also suffer from a degradation in spatial resolution by 1/v. This approach is limited to imaging no more than a few colors.Though most spectral imaging techniques suffer from a degradation in efficiency, resolution or both; there are two noteworthy exceptions. One is to use a cascade of spectral beam splitters with a separate imaging focal plane for each color. The efficiency of this approach is determined by that of the beam splitters and in theory can be 100%; however, practical constraints limit application of this approach to resolution of no more than a few spectral bands. The other exception is Fourier transform spectroscopy. A Fourier transform spectrometer uses an interferometer to multiplex the spectral information. Both lateral shear and longitudinal displacement interferometers are used. Lateral shear interferometers use common path interferometers that multiplex the spatial and spectral information in space; they are relatively insensitive to vibration and often find application in field measurements. Longitudinal displacement interferometers multiplex the spectral information in time; they are susceptible to vibrations and usually find application in laboratories. A Fourier transform imaging spectrometer based on a lateral shear interferometer would have the same efficiency limit as a scanned slit spectrometer, while that based on a longitudinal displacement interferometer could have very high efficiency but would be useful only in low vibration environments.Each of these imaging techniques ...

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Hyperspectral Imaging

HAGEN

2024

Computational Imaging for Scene Understanding

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<title>Spectrotomography: a new method of obtaining spectrograms of two-dimensional objects</title>

Cited by 16 publications

References 0 publications

Development of a highly sensitive spectral camera for cartilage monitoring using fluorescence spectroscopy

Development of a highly sensitive spectral camera for cartilage monitoring using fluorescence spectroscopy

Angularly multiplexed spectral imager

Hyperspectral Imaging

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