keyword
MENU ▼
Read by QxMD icon Read
search

Image Reconstruction

keyword
https://www.readbyqxmd.com/read/28742686/bioengineering-a-human-face-graft-the-matrix-of-identity
#1
Jérôme Duisit, Louis Maistriaux, Adriano Taddeo, Giuseppe Orlando, Virginie Joris, Emmanuel Coche, Catherine Behets, Jan Lerut, Chantal Dessy, Giulio Cossu, Esther Vögelin, Robert Rieben, Pierre Gianello, Benoît Lengelé
OBJECTIVE: During the last decade, face allotransplantation has been shown to be a revolutionary reconstructive procedure for severe disfigurements. However, offer to patients remains limited due to lifelong immunosuppression. To move forward in the field, a new pathway in tissue engineering is proposed. BACKGROUND: Our previously reported technique of matrix production of a porcine auricular subunit graft has been translated to a human face model. METHODS: 5 partial and 1 total face grafts were procured from human fresh cadavers...
July 24, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28742153/reconstructing-the-regulatory-circuit-of-cell-fate-determination-in-yeast-mating-response
#2
Bin Shao, Haiyu Yuan, Rongfei Zhang, Xuan Wang, Shuwen Zhang, Qi Ouyang, Nan Hao, Chunxiong Luo
Massive technological advances enabled high-throughput measurements of proteomic changes in biological processes. However, retrieving biological insights from large-scale protein dynamics data remains a challenging task. Here we used the mating differentiation in yeast Saccharomyces cerevisiae as a model and developed integrated experimental and computational approaches to analyze the proteomic dynamics during the process of cell fate determination. When exposed to a high dose of mating pheromone, the yeast cell undergoes growth arrest and forms a shmoo-like morphology; however, at intermediate doses, chemotropic elongated growth is initialized...
July 24, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28742062/a-method-to-incorporate-the-effect-of-beam-quality-on-image-noise-in-a-digitally-reconstructed-radiograph-drr-based-computer-simulation-for-optimisation-of-digital-radiography
#3
Craig S Moore, Tim J Wood, John R Saunderson, Andy W Beavis
The use of computer simulated digital x-radiographs for optimisation purposes has become widespread in recent years. To make these optimisation investigations effective, it is vital simulated radiographs contain accurate anatomical and system noise. Computer algorithms that simulate radiographs based solely on the incident detector x-ray intensity ('dose') have been reported extensively in the literature. However, while it has been established for digital mammography that x-ray beam quality is an important factor when modelling noise in simulated images there are no such studies for diagnostic imaging of the chest, abdomen and pelvis...
July 25, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28742039/reconstructing-interlaced-high-dynamic-range-video-using-joint-learning
#4
Inchang Choi, Seung-Hwan Baek, Min H Kim
For extending the dynamic range of video, it is a common practice to capture multiple frames sequentially with different exposures and combine them to extend the dynamic range of each video frame. However, this approach results in typical ghosting artifacts due to fast and complex motion in nature. As an alternative, video imaging with interlaced exposures has been introduced to extend the dynamic range. However, the interlaced approach has been hindered by jaggy artifacts and sensor noise, leading to concerns over image quality...
July 24, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28742033/the-impact-of-model-based-clutter-suppression-on-cluttered-aberrated-wavefronts
#5
Kazuyuki Dei, Brett Byram
Recent studies reveal that both phase aberration and reverberation play a major role in degrading ultrasound image quality. We previously developed an algorithm for suppressing clutter, but we have not yet tested it in the context of aberrated wavefronts. In this study, we evaluate our previously reported algorithm, called aperture domain model image reconstruction (ADMIRE), in the presence of phase aberration and in the presence of multipath scattering and phase aberration. We use simulations to investigate phase aberration corruption and correction in the presence of reverberation...
July 20, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28742016/intraoperative-ultrasonography-of-the-biliary-tract-using-saline-as-a-contrast-agent-a-fast-and-accurate-technique-to-identify-complex-biliary-anatomy
#6
Abhijit Chandra, Vivek Gupta, Rahul Rahul, Manoj Kumar, Ajeet Maurya
BACKGROUND: Intraoperative assessment of biliary tract anatomy is relevant for a number of benign and malignant hepatobiliary diseases. During biliary reconstruction, drainage of all relevant bile ducts is imperative to prevent atrophy of undrained segment, cholangitis and secondary biliary cirrhosis. Intraoperative cholangiography, though widely used for intraoperative imaging of the biliary tract, involves heavy equipment use, radiation risk and has a limited role in the evaluation of isolated segmental bile ducts...
August 1, 2017: Canadian Journal of Surgery. Journal Canadien de Chirurgie
https://www.readbyqxmd.com/read/28741935/super-photostable-phosphole-based-dye-for-multiple-acquisition-stimulated-emission-depletion-imaging
#7
Chenguang Wang, Masayasu Taki, Yoshikatsu Sato, Aiko Fukazawa, Tetsuya Higashiyama, Shigehiro Yamaguchi
As stimulated emission depletion (STED) microscopy can provide structural details of cells with an optical resolution beyond the diffraction limit, it has become an indispensable tool in cell biology. However, the intense STED laser beam usually causes rapid photobleaching of the employed fluorescent dyes, which significantly limits the utility of STED microscopy from a practical perspective. Herein we report a new design of super-photostable dye, PhoxBright 430 (PB430), comprising a fully ring-fused π-conjugated skeleton with an electron-accepting phosphole P-oxide unit...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28741597/motion-compensation-for-cone-beam-ct-using-fourier-consistency-conditions
#8
Martin Berger, Yan Xia, Wolfgang Aichinger, Katrin Mentl, Mathias Unberath, Andre Aichert, Christian Riess, Joachim Hornegger, Rebecca Fahrig, Andreas Konrad Maier
In cone-beam CT, involuntary patient motion and inaccurate or irreproducible scanner motion substantially degrades image quality. To avoid artifacts this motion needs to be estimated and compensated during image reconstruction. In previous work we showed that Fourier Consistency Conditions (FCC) can be used in fan-beam CT to estimate motion in the sinogram domain. This work extends the FCC to 3-D cone-beam CT. We derive an efficient cost function to compensate for 3-D motion using 2-D detector translations...
July 25, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28740918/impact-of-moving-target-on-measurement-accuracy-in-3d-and-4d-pet-imaging-a-phantom-study
#9
Yunfeng Cui, James Bowsher, Jing Cai, Fang-Fang Yin
PURPOSE: The purpose of this study was to evaluate the impact of tumor motion on maximum standardized uptake value (SUVmax) and metabolic tumor volume (MTV) measurements in both 3-dimensional and respiratory-correlated, 4-dimensional positron emission tomography (PET) imaging. We also evaluated the effect of implementing different attenuation correction methods in 4-dimensional PET image reconstruction on SUVmax and MTV. METHODS AND MATERIALS: An anthropomorphic thorax phantom with a spherical ball as a surrogate for a tumor was used...
January 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28740907/functional-imaging-equivalence-and-proof-of-concept-for-image-guided-adaptive-radiotherapy-with-fixed-gantry-and-rotating-couch
#10
Ilana Feain, Chun-Chien Shieh, Paul White, Ricky O'Brien, Sandra Fisher, William Counter, Peter Lazarakis, David Stewart, Simon Downes, Michael Jackson, Siddhartha Baxi, Brendan Whelan, Kuldeep Makhija, Chen-Yu Huang, Michael Barton, Paul Keall
PURPOSE: The purpose of this article is to present the first imaging experiments to demonstrate the functional equivalence between a conventional rotational gantry and a fixed-beam imaging geometry, and the feasibility of an iterative image-reconstruction technique under gravitational deformation. METHODS AND MATERIALS: Experiments were performed using an Elekta Axesse with Agility MLC and XVI, a custom-built rotating phantom stage, a Catphan QA phantom, and a porcine heart...
October 2016: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28740781/direct-to-implant-reconstruction-in-nipple-sparing-mastectomy-patient-selection-by-preoperative-digital-mammogram
#11
Alberto O Rancati, Claudio H Angrigiani, Dennis C Hammond, Maurizio B Nava, Eduardo G Gonzalez, Julio C Dorr, Gustavo F Gercovich, Nicola Rocco, Roman L Rostagno
BACKGROUND: Digital mammography clearly distinguishes gland tissue density from the overlying nonglandular breast tissue coverage, which corresponds to the existing tissue between the skin and the superficial layer of the fascia superficialis surrounding the gland (i.e., dermis and subcutaneous fat). Preoperative digital imaging can determine the thickness of this breast tissue coverage, thus facilitating planning and reducing the rate of necrotic complications after direct to implant (DTI) reconstruction in nipple sparing mastectomy (NSM)...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28740773/botulinum-toxin-a-as-an-adjunct-to-abdominal-wall-reconstruction-for-incisional-hernia
#12
Sinor Soltanizadeh, Frederik Helgstrand, Lars N Jorgensen
BACKGROUND: Repair of large incisional hernias remains a surgical and costly challenge. Temporary paralysis of the lateral abdominal wall muscles with topical administration of botulinum toxin A (BTA) is a new therapeutic concept, which may obviate the need for component separation technique (CST) for repair of large incisional hernias. Current literature on the administration of BTA as adjunct to surgical repair of abdominal incisional hernias was investigated. METHODS: The electronic databases PubMed and Embase were searched for eligible studies...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28740768/fmri-after-phalloplasty-with-nerve-anastomosis-in-a-trans-man-patient
#13
Roberto Doria-Medina, Åsa Carlsson, Emma H Jönsson, Lars Jönsson, Andri Thorarinsson, Mattias Lidén, Gennaro Selvaggi
We report on a case of a trans-man patient, who underwent penile reconstruction with the use of a radial forearm flap, urethroplasty, vaginectomy and scrotoplasty, insertion of testicle implants, and penile erection implants, similar to previously described methods. One of the requirements for an ideal phalloplasty is the preservation of erogenous sensitivity, which is often demanded by the patients for fulfilling their sexual well-being. For the first time known to us, we use a functional magnetic resonance imaging following radial forearm flap phalloplasty with nerve anastomosis to assess the cortical activation after clitoral stimulation...
June 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28740720/analysing-the-reasons-of-failure-of-surgical-mitral-repair-approaches-do-we-need-to-better-think-in-biomechanics
#14
Massimiliano Fraldi, Cristiano Spadaccio, Christos G Mihos, Francesco Nappi
The failure of mitral valve repair procedures revealed in the outcomes of the recent randomized studies is suggesting the necessity for a better understanding of the biomechanical mechanisms underlying the failure of the surgical approaches. Use of biomechanical modelling and finite element analysis (FEA) in cardiovascular research is an important aid in this context. In our group we developed a biomechanical model taking into account all the component of the mitral valve functional unit including the valve leaflets, the annulus, the papillary muscles, the chordae tendinea and the ventricular geometry...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28740565/whole-body-low-dose-computed-tomography-wbldct-in-assessment-of-patients-with-multiple-myeloma-pilot-study-and-standard-imaging-protocol-suggestion
#15
Robert Chrzan, Artur Jurczyszyn, Andrzej Urbanik
BACKGROUND: For decades, the main imaging tool in multiple myeloma (MM) patients was plain radiography. However, computed tomography (CT) has been included in the updated criteria of MM. The main disadvantage of CT is a considerably high radiation dose. Therefore, low-dose CT protocols could be a solution. The aim of the study was to (1) preliminarily analyse the usefulness of Whole-Body Low-Dose CT (WBLDCT) in the evaluation of patients with MM and (2) to make adjustments in the standard CT imaging protocol...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28739452/-over-sirix-a-new-method-for-sizing-aortic-endografts-in-combination-with-the-chimney-grafts-early-experience-with-aortic-arch-disease
#16
Stefano Fazzini, Sonia Ronchey, Matteo Orrico, Ombretta Martinelli, Vittorio Alberti, Barbara Praquin, Nicola Mangialardi
BACKGROUND: large gutters after chimney procedures are one of the main causes of type I endoleak (EL-I). This study aims to evaluate a new tailored planning named "Over-SIRIX", based on Osirix Imaging Software, to choose the correct main graft oversizing in order to minimize EL-I incidence. METHODS: from 2008 to 2015, 34 patients were treated with parallel grafts for aortic arch diseases at our institution. The study included 22 patients with single stent and antegrade flow configuration; they were divided in two groups (PRE and POST "Over-SIRIX")...
July 21, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28739298/guidelines-for-humeral-subluxation-cutoff-values-a-comparative-study-between-conventional-reoriented-and-three-dimensional-computed-tomography-scans-of-healthy-shoulders
#17
Matthijs Jacxsens, Michael R Karns, Heath B Henninger, Alex J Drew, Alexander Van Tongel, Lieven De Wilde
BACKGROUND: The humeral subluxation index (HSI) is frequently assessed on computed tomography (CT) scans in conditions of the shoulder characterized by humeral displacement. An arbitrarily set HSI cutoff value of 45% for anterior subluxation and 55% for posterior subluxation has been widely accepted. We studied whether mean values and thresholds of humeral subluxation, in relation to the glenoid and scapula, were influenced by different imaging modalities. METHODS: The HSIs referenced to the scapula (SHSI) and glenoid (GHSI) were compared between conventional CT scans, CT scans reoriented into the corresponding reference plane (ie, scapular plane for the SHSI and glenoid center plane for the GHSI), and 3-dimensional (3D) CT reconstructions of 120 healthy shoulders...
July 21, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28739171/efficacy-of-ultrasound-mammography-and-magnetic-resonance-imaging-in-detecting-breast-implant-rupture-a-retrospective-study-of-175-reconstructive-and-aesthetic-sub-pectoral-breast-augmentation-cases
#18
Alessio Stivala, Kessara Rem, Sara Leuzzi, Vivien Moris, Caroline François, Marc Revol, Sarra Cristofari
To date, the effectiveness of radiological imaging in detecting silicone breast implant rupture is uncertain. The purpose of this study is to retrospectively evaluate the effectiveness of radiological imaging when diagnosing a rupture. In this study, 175 patients with 242 breast implants were included, of which 168 and 74 implants were used for breast reconstruction and aesthetic augmentation, respectively. All patients who underwent revision surgery, between January 2015 and June 2016, following breast augmentation or reconstruction were included, regardless of any pre-operative diagnosis of rupture that had been made...
June 3, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28738005/accuracy-and-repeatability-of-long-bone-replicas-of-small-animals-fabricated-by-use-of-low-end-and-high-end-commercial-three-dimensional-printers
#19
Jamie A Cone, Thomas M Martin, Denis J Marcellin-Little, Ola L A Harrysson, Emily H Griffith
OBJECTIVE To assess the repeatability and accuracy of polymer replicas of small, medium, and large long bones of small animals fabricated by use of 2 low-end and 2 high-end 3-D printers. SAMPLE Polymer replicas of a cat femur, dog radius, and dog tibia were fabricated in triplicate by use of each of four 3-D printing methods. PROCEDURES 3-D renderings of the 3 bones reconstructed from CT images were prepared, and length, width of the proximal aspect, and width of the distal aspect of each CT image were measured in triplicate...
August 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28737675/3d-reconstruction-of-space-objects-from-multi-views-by-a-visible-sensor
#20
Haopeng Zhang, Quanmao Wei, Zhiguo Jiang
In this paper, a novel 3D reconstruction framework is proposed to recover the 3D structural model of a space object from its multi-view images captured by a visible sensor. Given an image sequence, this framework first estimates the relative camera poses and recovers the depths of the surface points by the structure from motion (SFM) method, then the patch-based multi-view stereo (PMVS) algorithm is utilized to generate a dense 3D point cloud. To resolve the wrong matches arising from the symmetric structure and repeated textures of space objects, a new strategy is introduced, in which images are added to SFM in imaging order...
July 22, 2017: Sensors
keyword
keyword
75144
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"