Temat: super-resolution - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Semi-PROPELLER Compressed Sensing Image Reconstruction with Enhanced Resolution in MRI
Autorzy:: Malczewski, K.
Tematy:: MRI
super-resolution
compressed sensing; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226988.pdf Link otwiera się w nowym oknie
Opis:: Magnetic Resonance Imaging (MRI) reconstruction algorithm using semi-PROPELLER compressed sensing is presented in this paper. It is exhibited that introduced algorithm for estimating data shifts is feasible when super- resolution is applied. The offered approach utilizes compressively sensed MRI PROPELLER sequences and improves MR images spatial resolution in circumstances when highly undersampled k-space trajectories are applied. Compressed sensing (CS) aims at signal and images reconstructing from significantly fewer measurements than were traditionally thought necessary. It is shown that the presented approach improves MR spatial resolution in cases when Compressed Sensing (CS) sequences are used. The application of CS in medical modalities has the potential for significant scan time reductions, with visible benefits for patients and health care economics. These methods emphasize on maximizing image sparsity on known sparse transform domain and minimizing fidelity. This diagnostic modality struggles with an inherently slow data acquisition process. The use of CS to MRI leads to substantial scan time reductions [7] and visible benefits for patients and economic factors. In this report the objective is to combine Super-Resolution image enhancement algorithm with both PROPELLER sequence and CS framework. The motion estimation algorithm being a part of super resolution reconstruction (SRR) estimates shifts for all blades jointly, utilizing blade-pair correlations that are both strong and more robust to noise.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Increasing microscopy resolution with photobleaching and intensity cumulant analysis
Autorzy:: Dziob, Daniel
Brutkowski, W.
Bernas, T.
Opis:: Super-resolution fluorescence microscopy and its applications for analysis of biological structures are evolving rapidly field. A number of approaches aimed at overcoming the fundamental limit imposed by diffraction have been proposed in recent years. Here we present a modification of super-resolution optical fluctuation imaging (SOFI), a technique based on spatio-temporal evaluation of the optical signal from independently fluctuating emitters. Instead of rapid, reversible photoswitching, photobleaching is used to produce irreversible transitions between emitting and nonemitting states of the fluorochrome molecules. Simulated images are used to demonstrate that, in the absence of noise, the proposed SOFI modification increases the efficiency of transfer of high spatial frequencies in a fluorescence microscope. Correspondingly, a decrease of the point spread function (PSF) width is obtained. Moreover, the modified SOFI algorithm is capable of resolving point emitters in the presence of simulated noise. Using real biological images we demonstrate that an increase of resolution is obtained in 2D optical sections through densely packed chromatin in cell nuclei and lamin layer at the nuclear envelope. Finally, the approach is extended to 3D wide-field microscopy, allowing reduction of out-of-focus image blurring.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: UV-induced spectral shift and protonation of DNA fluorescent dye Hoechst 33258
Autorzy:: Żurek-Biesiada, Dominika
Waligórski, Piotr
Dobrucki, Jerzy
Opis:: DNA-bound Hoechst 33258 is readily excited with UV light and emits blue fluorescence, however, upon exposure to UV, the dye undergoes photobleaching as well as photoconversion to a blue-excited green-emitting form. We demonstrate that the UV-generated green-emitting form of Hoechst 33258 exhibits spectral properties very similar to the form of the dye that can be obtained by subjecting it to an acidic environment (pH 0.5–3.0). We also demonstrate that exposure of Hoechst 33258 to UV light (or hydrogen peroxide) leads to generation of the protonated (1+, 2+, 3+ and possibly the 4+) forms of the dye. Photoconversion of Hoechst 33258 has recently been exploited in single molecule localisation microscopy, thus understanding photophysics of this process can facilitate further development of high resolution optical imaging.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Low-cost, low-resolution IR system with super-resolution interpolation of thermal images for industrial applications
Autorzy:: Więcek, P.
Sankowski, D.
Tematy:: Super-resolution
residual deep neural networks
image interpolation; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114076.pdf Link otwiera się w nowym oknie
Opis:: In this paper authors present application of deep neural networks for super-resolution interpolation of infrared images. A residual neural network with reduced number of layers was used. The transfer learning using RGB visual images was applied in this research. The validation of the network was performed for 32×24 and 160×120 pixels infrared images, with the up-sampling scale factors 2, 3, 4, 5 and 6. Monitoring of high temperature industrial processes like inductive heating and thermal hardening is the main application of proposed methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The Development of a Generative Approach for Joint Super-Resolution Image Reconstruction from Highly Sparse Raw Data in the Context of MR-PET Imaging
Autorzy:: Malczewski, Krzysztof
Tematy:: GAN
WGAN
super-resolution
compressive sensing
medical modalities; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Instytut Informatyki Technicznej
Powiązania:: https://bibliotekanauki.pl/articles/59122867.pdf Link otwiera się w nowym oknie
Opis:: The present study introduces a rapid and efficient approach for reconstructing high-resolution images in hybrid MRI-PET scanners. The application of sparsity, compressed sensing (CS), and super-resolution reconstruction (SRR) methodologies can significantly decrease the demands of data acquisition while concurrently attaining high-resolution output. G-guided generative multilevel networks for sparsely sampled MR-PET input are shown here. Compressed Sensing using conjugate symmetry and Partial Fourier methodology speeds up data collection over k-space sampling methods. GANs and k-space adjustments are used in this image domain technique. The employed methodology utilizes discrete preprocessing stages to effectively tackle the challenges associated with the deblurring, reducing motion artifacts, and denoising of layers. Initial trials offer contextual details and accelerate evaluations. Preliminary experiments provide contextual information and expedite assessments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Graphene Energy Transfer for Single-Molecule Biophysics, Biosensing & Superresolution Microscopy
Autorzy:: Schröder, Tim
Zielonka, Karolina
Tinnefeld, Philip
Kamińska, Izabela
Yaadav, Renukka
Raab, Mario
Zähringer, Jonas
Krause, Stefan
Bohlen, Johann
Schüler, Patrick
Wydawca:: Wiley Online Library
Cytata wydawnicza:: I. Kamińska, J. Bohlen, R. Yaadav, P. Schüler, M. Raab, T. Schröder, J. Zähringer, K. Zielonka, S. Krause, P. Tinnefeld, Graphene Energy Transfer for Single-Molecule Biophysics, Biosensing, and Super-Resolution Microscopy. Adv. Mater. 2021, 33, 2101099. https://doi.org/10.1002/adma.202101099
Opis:: Graphene is considered a game-changing material, especially for its mechanical and electrical properties. This work exploits that graphene is almost transparent but quenches fluorescence in a range up to ≈40 nm. Graphene as a broadband and unbleachable energy-transfer acceptor without labeling, is used to precisely determine the height of molecules with respect to graphene, to visualize the dynamics of DNA nanostructures, and to determine the orientation of Förster-type resonance energy transfer (FRET) pairs. Using DNA origami nanopositioners, biosensing, single-molecule tracking, and DNA PAINT super-resolution with <3 nm z-resolution are demonstrated. The range of examples shows the potential of graphene-on-glass coverslips as a versatile platform for single-molecule biophysics, biosensing, and super-resolution microscopy.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 7.

Tytuł:: Single Image Super-Resolution through Sparse Representation via Coupled Dictionary learning
Autorzy:: Patel, Rutul
Thakar, Vishvjit
Joshi, Rutvij
Tematy:: single image super-resolution
Dictionary Learning
Sparse representation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226607.pdf Link otwiera się w nowym oknie
Opis:: Single Image Super-Resolution (SISR) through sparse representation has received much attention in the past decade due to significant development in sparse coding algorithms. However, recovering high-frequency textures is a major bottleneck of existing SISR algorithms. Considering this, dictionary learning approaches are to be utilized to extract high-frequency textures which improve SISR performance significantly. In this paper, we have proposed the SISR algorithm through sparse representation which involves learning of Low Resolution (LR) and High Resolution (HR) dictionaries simultaneously from the training set. The idea of training coupled dictionaries preserves correlation between HR and LR patches to enhance the Super-resolved image. To demonstrate the effectiveness of the proposed algorithm, a visual comparison is made with popular SISR algorithms and also quantified through quality metrics. The proposed algorithm outperforms compared to existing SISR algorithms qualitatively and quantitatively as shown in experimental results. Furthermore, the performance of our algorithm is remarkable for a smaller training set which involves lesser computational complexity. Therefore, the proposed approach is proven to be superior based upon visual comparisons and quality metrics and have noticeable results at reduced computational complexity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Rekonstrukcja termogramów wysokiej rozdzielczości na podstawie standardowych obrazów termowizyjnych
Reconstruction of high-resolution thermal images on the basis of standard thermal images
Autorzy:: Zator, S.
Lasar, M.
Tematy:: termografia
rozdzielczość
nadrozdzielczość
zniekształcenia
thermographs
super-resolution
correction
distortion; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/152114.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono metodę uzyskania termogramów o wysokiej rozdzielczości wykorzystującą sekwencję termogramów przesuniętych podpikselowo. W artykule została opisana metodologia uzyskiwania termogramów. Opisana został użyta aparatura oraz zbudowane stanowisko do uzyskiwania termogramów. Zaprezentowane zostały wyniki jakie uzyskano przy użyciu zastosowanej metody.
This paper presents a method for obtaining high-resolution thermal images based on thermal images of low resolution. A series of low-resolution images was made using the shifted pixels method. In the paper there are described the most common methods for reconstructing high resolution images from low-resolution images. They use transformations in the frequency domain which combine the discrete Fourier transform coefficients of low-resolution images with the continuous Fourier transform of an unknown high-resolution image. There is described and implemented the reconstruction method that uses transformations in space - iterative back-projection. There was constructed a stand for obtaining thermograms. It contains a thermal imaging camera VarioCAM Head placed on precision guiding devices (rotation stage and linear stage). The real-time controller - cRIO 9022 with software written in LabVIEW 2009 is used for control of turntable motors and a linear displacement system. There are given the results obtained with use of the presented method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fotokonwersja barwników wykazujących powinowactwo do DNA i jej zastosowanie w mikroskopii wysokorozdzielczej
Photoconversion of DNA-binding dyes and its application in super-resolution microscopy
Autorzy:: Żurek-Biesiada, Dominika
Współwytwórcy:: Dobrucki, Jerzy
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Książka

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Skocz do pozycji: 10.

Tytuł:: Tackling tumour cell heterogeneity at the super-resolution level in human colorectal cancer tissue
Autorzy:: Gelléri, Márton
Kröger, Ole
Cremer, Christoph
Neumann, Jan
Allgayer, Heike
Sadlo, Filip
Berniak, Krzysztof
Contreras-Gerenas, María F.
Marx, Alexander
Wagenknecht, Hans-Achim
Lang, Fabian
Opis:: Simple Summary Tumour cell heterogeneity is the most fundamental problem in cancer diagnosis and therapy. Micro-diagnostic technologies able to differentiate the heterogeneous molecular, especially metastatic, potential of single cells or cell clones already within early primary tumours of carcinoma patients would be of utmost importance. Single molecule localisation microscopy (SMLM) has recently allowed the imaging of subcellular features at the nanoscale. However, the technology has mostly been limited to cultured cell lines only. We introduce a first-in-field approach for quantitative SMLM-analysis of chromatin nanostructure in individual cells in resected, routine-pathology colorectal carcinoma patient tissue sections, illustrating, as a first example, changes in nuclear chromatin nanostructure and microRNA intracellular distribution within carcinoma cells as opposed to normal cells, chromatin accessibility and microRNAs having been shown to be critical in gene regulation and metastasis. We believe this technology to have an enormous potential for future differential diagnosis between individual cells in the tissue context. Tumour cell heterogeneity, and its early individual diagnosis, is one of the most fundamental problems in cancer diagnosis and therapy. Single molecule localisation microscopy (SMLM) resolves subcellular features but has been limited to cultured cell lines only. Since nuclear chromatin architecture and microRNAs are critical in metastasis, we introduce a first-in-field approach for quantitative SMLM-analysis of chromatin nanostructure in individual cells in resected, routine-pathology colorectal carcinoma (CRC) patient tissue sections. Chromatin density profiles proved to differ for cells in normal and carcinoma colorectal tissues. In tumour sections, nuclear size and chromatin compaction percentages were significantly different in carcinoma versus normal epithelial and other cells of colorectal tissue. SMLM analysis in nuclei from normal colorectal tissue revealed abrupt changes in chromatin density profiles at the nanoscale, features not detected by conventional widefield microscopy. SMLM for microRNAs relevant for metastasis was achieved in colorectal cancer tissue at the nuclear level. Super-resolution microscopy with quantitative image evaluation algorithms provide powerful tools to analyse chromatin nanostructure and microRNAs of individual cells from normal and tumour tissue at the nanoscale. Our new perspectives improve the differential diagnosis of normal and (metastatically relevant) tumour cells at the single-cell level within the heterogeneity of primary tumours of patients.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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