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Compressed sensing

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https://www.readbyqxmd.com/read/28550650/single-breath-hold-3-d-cine-imaging-of-the-left-ventricle-using-cartesian-sampling
#1
Jens Wetzl, Michaela Schmidt, François Pontana, Benjamin Longère, Felix Lugauer, Andreas Maier, Joachim Hornegger, Christoph Forman
OBJECTIVES: Our objectives were to evaluate a single-breath-hold approach for Cartesian 3-D CINE imaging of the left ventricle with a nearly isotropic resolution of [Formula: see text] and a breath-hold duration of [Formula: see text]19 s against a standard stack of 2-D CINE slices acquired in multiple breath-holds. Validation is performed with data sets from ten healthy volunteers. MATERIALS AND METHODS: A Cartesian sampling pattern based on the spiral phyllotaxis and a compressed sensing reconstruction method are proposed to allow 3-D CINE imaging with high acceleration factors...
May 26, 2017: Magma
https://www.readbyqxmd.com/read/28547006/on-homotopy-continuation-for-speech-restoration
#2
Darian M Onchis, Pedro Real
In this paper, a homotopy-based method is employed for the recovery of speech recordings from missing or corrupted samples taken in a noisy environment. The model for the acquisition device is a compressed sensing scenario using Gabor frames. To recover an approximation of the speech file, we used the basis pursuit denoising method with the homotopy continuation algorithm. We tested the proposed method with various speech recordings.
June 2, 2016: Comput Topol Image Context (2016)
https://www.readbyqxmd.com/read/28546862/block-sparsity-based-joint-compressed-sensing-recovery-of-multi-channel-ecg-signals
#3
Anurag Singh, Samarendra Dandapat
In recent years, compressed sensing (CS) has emerged as an effective alternative to conventional wavelet based data compression techniques. This is due to its simple and energy-efficient data reduction procedure, which makes it suitable for resource-constrained wireless body area network (WBAN)-enabled electrocardiogram (ECG) telemonitoring applications. Both spatial and temporal correlations exist simultaneously in multi-channel ECG (MECG) signals. Exploitation of both types of correlations is very important in CS-based ECG telemonitoring systems for better performance...
April 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28545406/deterministic-compressive-sampling-for-high-quality-image-reconstruction-of-ultrasound-tomography
#4
Tran Quang Huy, Huynh Huu Tue, Ton That Long, Tran Duc-Tan
BACKGROUND: A well-known diagnostic imaging modality, termed ultrasound tomography, was quickly developed for the detection of very small tumors whose sizes are smaller than the wavelength of the incident pressure wave without ionizing radiation, compared to the current gold-standard X-ray mammography. Based on inverse scattering technique, ultrasound tomography uses some material properties such as sound contrast or attenuation to detect small targets. The Distorted Born Iterative Method (DBIM) based on first-order Born approximation is an efficient diffraction tomography approach...
May 25, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28543069/real-time-dynamic-mr-image-reconstruction-using-compressed-sensing-and-principal-component-analysis-cs-pca-demonstration-in-lung-tumor-tracking
#5
Bryson Dietz, Eugene Yip, Jihyun Yun, B Gino Fallone, Keith Wachowicz
PURPOSE: This work presents a real-time dynamic image reconstruction technique, that combines compressed sensing and principal component analysis (CS-PCA), to achieve real-time adaptive radiotherapy with the use of a linac-magnetic resonance imaging system. METHODS: Six retrospective fully sampled dynamic data sets of patients diagnosed with non-small cell lung cancer were used to investigate the CS-PCA algorithm. Using a database of fully sampled k-space, principal components (PC's) were calculated to aid in the reconstruction of undersampled images...
May 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28541899/motion-compensated-compression-of-dynamic-voxelized-point-clouds
#6
Ricardo L De Queiroz, Philip A Chou
Dynamic point clouds are a potential new frontier in visual communication systems. A few articles have addressed the compression of point clouds, but very few references exist on exploring temporal redundancies. This paper presents a novel motion-compensated approach to encoding dynamic voxelized point clouds at low bit rates. A simple coder breaks the voxelized point cloud at each frame into blocks of voxels. Each block is either encoded in intra-frame mode or is replaced by a motion-compensated version of a block in the previous frame...
May 24, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#7
Tae-Ho Kim, Chang-Seok Lee, Sangwon Kim, Jaehyun Hur, Sangmin Lee, Keun Wook Shin, Young-Zoon Yoon, Moon Kee Choi, Jiwoong Yang, Dae-Hyeong Kim, Taeghwan Hyeon, Seongjun Park, Sungwoo Hwang
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28534816/roi-based-on-board-compression-for-hyperspectral-remote-sensing-images-on-gpu
#8
Rossella Giordano, Pietro Guccione
In recent years, hyperspectral sensors for Earth remote sensing have become very popular. Such systems are able to provide the user with images having both spectral and spatial information. The current hyperspectral spaceborne sensors are able to capture large areas with increased spatial and spectral resolution. For this reason, the volume of acquired data needs to be reduced on board in order to avoid a low orbital duty cycle due to limited storage space. Recently, literature has focused the attention on efficient ways for on-board data compression...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28528319/quantitative-dla-based-compressed-sensing-for-t1-weighted-acquisitions
#9
Pavel Svehla, Khieu-Van Nguyen, Jing-Rebecca Li, Luisa Ciobanu
High resolution Manganese Enhanced Magnetic Resonance Imaging (MEMRI), which uses manganese as a T1 contrast agent, has great potential for functional imaging of live neuronal tissue at single neuron scale. However, reaching high resolutions often requires long acquisition times which can lead to reduced image quality due to sample deterioration and hardware instability. Compressed Sensing (CS) techniques offer the opportunity to significantly reduce the imaging time. The purpose of this work is to test the feasibility of CS acquisitions based on Diffusion Limited Aggregation (DLA) sampling patterns for high resolution quantitative T1-weighted imaging...
May 9, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28523180/primary-atypical-carcinoid-tumor-of-the-mediastinum-a-very-rare-finding
#10
Luigi Ventura, Letizia Gnetti, Enrico Maria Silini, Guido Rindi, Paolo Carbognani, Michele Rusca, Luca Ampollini
Primary neuroendocrine tumors (NETs) of the mediastinum are very rare. Prognosis is usually poor despite treatment options. We present the case of a primary atypical carcinoid tumor of the mediastinum successfully treated by multimodal approach. A 50-year-old man presented for asthenia, dyspnea, and substernal sense of weight for two weeks. A chest-CT scan revealed a tumor mass of 107×55×95 mm(3) localized in the anterosuperior mediastinum compressing both brachiocephalic veins, the superior vena cava, the pericardium, and lungs...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28515392/assessment-of-left-ventricular-function-and-mass-on-free-breathing-compressed-sensing-real-time-cine-imaging
#11
Tomoyuki Kido, Teruhito Kido, Masashi Nakamura, Kouki Watanabe, Michaela Schmidt, Christoph Forman, Teruhito Mochizuki
BACKGROUND: Compressed sensing (CS) cine magnetic resonance imaging (MRI) has the advantage of being inherently insensitive to respiratory motion. This study compared the accuracy of free-breathing (FB) CS and breath-hold (BH) standard cine MRI for left ventricular (LV) volume assessment.Methods and Results:Sixty-three patients underwent cine MRI with both techniques. Both types of images were acquired in stacks of 8 short-axis slices (temporal/spatial resolution, 41 ms/1.7×1.7×6 mm(3)) and compared for ejection fraction, end-diastolic and systolic volumes, stroke volume, and LV mass...
May 18, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28513587/experimental-quantum-compressed-sensing-for-a-seven-qubit-system
#12
C A Riofrío, D Gross, S T Flammia, T Monz, D Nigg, R Blatt, J Eisert
Well-controlled quantum devices with their increasing system size face a new roadblock hindering further development of quantum technologies. The effort of quantum tomography-the reconstruction of states and processes of a quantum device-scales unfavourably: state-of-the-art systems can no longer be characterized. Quantum compressed sensing mitigates this problem by reconstructing states from incomplete data. Here we present an experimental implementation of compressed tomography of a seven-qubit system-a topological colour code prepared in a trapped ion architecture...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28508110/joint-non-uniform-sampling-of-all-incremented-time-delays-for-quicker-acquisition-in-protein-relaxation-studies
#13
Mateusz Urbańczyk, Michał Nowakowski, Wiktor Koźmiński, Krzysztof Kazimierczuk
NMR relaxometry plays crucial role in studies of protein dynamics. The measurement of longitudinal and transverse relaxation rates of [Formula: see text]N is the main source of information on backbone motions. However, even the most basic approach exploiting a series of [Formula: see text]N HSQC spectra can require several hours of measurement time. Standard non-uniform sampling (NUS), i.e. random under-sampling of indirect time domain, typically cannot reduce this by more than 2-4[Formula: see text] due to relatively low "compressibility" of these spectra...
May 15, 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28505085/sparsity-adaptive-matching-pursuit-detection-algorithm-based-on-compressed-sensing-for-radar-signals
#14
Yanbo Wei, Zhizhong Lu, Gannan Yuan, Zhao Fang, Yu Huang
In this paper, the application of the emerging compressed sensing (CS) theory and the geometric characteristics of the targets in radar images are investigated. Currently, the signal detection algorithms based on the CS theory require knowing the prior knowledge of the sparsity of target signals. However, in practice, it is often impossible to know the sparsity in advance. To solve this problem, a novel sparsity adaptive matching pursuit (SAMP) detection algorithm is proposed. This algorithm executes the detection task by updating the support set and gradually increasing the sparsity to approximate the original signal...
May 13, 2017: Sensors
https://www.readbyqxmd.com/read/28503635/efficient-convergent-sense-mri-reconstruction-for-nonperiodic-boundary-conditions-via-tridiagonal-solvers
#15
Mai Le, Jeffrey A Fessler
Undersampling is an effective method for reducing scan acquisition time for MRI. Strategies for accelerated MRI such as parallel MRI and Compressed Sensing MRI present challenging image reconstruction problems with non-differentiable cost functions and computationally demanding operations. Variable splitting (VS) can simplify implementation of difficult image reconstruction problems, such as the combination of parallel MRI and Compressed Sensing, CS-SENSE-MRI. Combined with augmented Lagrangian (AL) and alternating minimization strategies, variable splitting can yield iterative minimization algorithms with simpler auxiliary variable updates...
March 2017: IEEE Transactions on Computational Imaging
https://www.readbyqxmd.com/read/28497620/accelerated-whole-heart-mr-angiography-using-a-variable-density-poisson-disc-undersampling-pattern-and-compressed-sensing-reconstruction
#16
Mehdi H Moghari, Martin Uecker, Sébastien Roujol, Majid Sabbagh, Tal Geva, Andrew J Powell
PURPOSE: To accelerate whole-heart three-dimension MR angiography (MRA) by using a variable-density Poisson-disc undersampling pattern and a compressed sensing (CS) reconstruction algorithm, and compare the results with sensitivity encoding (SENSE). METHODS: For whole-heart MRA, a prospective variable-density Poisson-disc k-space undersampling pattern was developed in which 1-2% of central part of k-space was fully sampled, and sampling in the remainder decreased exponentially toward the periphery...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28497486/5d-whole-heart-sparse-mri
#17
Li Feng, Simone Coppo, Davide Piccini, Jerome Yerly, Ruth P Lim, Pier Giorgio Masci, Matthias Stuber, Daniel K Sodickson, Ricardo Otazo
PURPOSE: A 5D whole-heart sparse imaging framework is proposed for simultaneous assessment of myocardial function and high-resolution cardiac and respiratory motion-resolved whole-heart anatomy in a single continuous noncontrast MR scan. METHODS: A non-electrocardiograph (ECG)-triggered 3D golden-angle radial balanced steady-state free precession sequence was used for data acquisition. The acquired 3D k-space data were sorted into a 5D dataset containing separated cardiac and respiratory dimensions using a self-extracted respiratory motion signal and a recorded ECG signal...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28494963/design-and-properties-of-genetically-encoded-probes-for-sensing-macromolecular-crowding
#18
Boqun Liu, Christoffer Åberg, Floris J van Eerden, Siewert J Marrink, Bert Poolman, Arnold J Boersma
Cells are highly crowded with proteins and polynucleotides. Any reaction that depends on the available volume can be affected by macromolecular crowding, but the effects of crowding in cells are complex and difficult to track. Here, we present a set of Förster resonance energy transfer (FRET)-based crowding-sensitive probes and investigate the role of the linker design. We investigate the sensors in vitro and in vivo and by molecular dynamics simulations. We find that in vitro all the probes can be compressed by crowding, with a magnitude that increases with the probe size, the crowder concentration, and the crowder size...
May 9, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28492418/clinical-feasibility-of-free-breathing-dynamic-t1-weighted-imaging-with-gadoxetic-acid-enhanced-liver-magnetic-resonance-imaging-using-a-combination-of-variable-density-sampling-and-compressed-sensing
#19
Jeong Hee Yoon, Mi Hye Yu, Won Chang, Jin-Young Park, Marcel Dominik Nickel, Yohan Son, Berthold Kiefer, Jeong Min Lee
OBJECTIVES: The purpose of the study was to investigate the clinical feasibility of free-breathing dynamic T1-weighted imaging (T1WI) using Cartesian sampling, compressed sensing, and iterative reconstruction in gadoxetic acid-enhanced liver magnetic resonance imaging (MRI). MATERIALS AND METHODS: This retrospective study was approved by our institutional review board, and the requirement for informed consent was waived. A total of 51 patients at high risk of breath-holding failure underwent dynamic T1WI in a free-breathing manner using volumetric interpolated breath-hold (BH) examination with compressed sensing reconstruction (CS-VIBE) and hard gating...
May 11, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28489549/secure-and-energy-efficient-data-transmission-system-based-on-chaotic-compressive-sensing-in-body-to-body-networks
#20
Haipeng Peng, Ye Tian, Jurgen Kurths, Lixiang Li, Yixian Yang, Daoshun Wang
Applications of wireless body area networks (WBANs) are extended from remote health care to military, sports, disaster relief, etc. With the network scale expanding, nodes increasing, and links complicated, a WBAN evolves to a body-to-body network. Along with the development, energy saving and data security problems are highlighted. In this paper, chaotic compressive sensing (CCS) is proposed to solve these two crucial problems, simultaneously. Compared with the traditional compressive sensing, CCS can save vast storage space by only storing the matrix generation parameters...
June 2017: IEEE Transactions on Biomedical Circuits and Systems
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