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https://www.readbyqxmd.com/read/29793097/quantitative-assessment-of-placental-perfusion-by-three-dimensional-power-doppler-ultrasound-for-twins-with-selective-intrauterine-growth-restriction-in-one-twin
#1
Wei Sun, Jingyi Liu, Ying Zhang, Ailu Cai, Zeyu Yang, Yili Zhao, Yu Wang, Zhe Cao, Qiuju Wei
OBJECTIVE: We quantitatively assessed placental perfusion using three-dimensional (3D) power Doppler ultrasound for twins with selective intrauterine growth restriction (sIUGR) in one twin. STUDY DESIGN: A prospective cross-sectional study was performed for 104 normal monochorionic diamniotic twins and 30 twins with sIUGR. Twins with sIUGR were divided into two groups: in group I (19 twins), both fetuses had continuous forward end-diastolic blood flow in the umbilical artery; in group II (11 twins), the smaller fetus had a loss or a reverse end-diastolic blood flow in the umbilical artery, but the larger fetus had continuous forward end-diastolic blood flow...
May 17, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29791029/development-of-a-3d-ultrasound-guidance-system-for-permanent-breast-seed-implantation
#2
Justin Michael, Daniel Morton, Deidre Batchelar, Michelle Hilts, Juanita Crook, Aaron Fenster
PURPOSE: Permanent breast seed implantation (PBSI) is a promising radiotherapy technique for early-stage breast cancer, completed in a single visit by permanently implanting 103 Pd seeds using needles inserted through a template and guided by 2D ultrasound (US). However, operator dependence has been highlighted as a limitation of this procedure. Consequently, we propose and have developed an intraoperative guidance system using 3D US and an instrumented mechanical arm to provide intraoperative 3D imaging and needle template tracking...
May 23, 2018: Medical Physics
https://www.readbyqxmd.com/read/29785294/development-of-a-precision-multimodal-surgical-navigation-system-for-lung-robotic-segmentectomy
#3
Jean Marc Baste, Valentin Soldea, Samy Lachkar, Philippe Rinieri, Mathieu Sarsam, Benjamin Bottet, Christophe Peillon
Minimally invasive sublobar anatomical resection is becoming more and more popular to manage early lung lesions. Robotic-assisted thoracic surgery (RATS) is unique in comparison with other minimally invasive techniques. Indeed, RATS is able to better integrate multiple streams of information including advanced imaging techniques, in an immersive experience at the level of the robotic console. Our aim was to describe three-dimensional (3D) imaging throughout the surgical procedure from preoperative planning to intraoperative assistance and complementary investigations such as radial endobronchial ultrasound (R-EBUS) and virtual bronchoscopy for pleural dye marking...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29781742/early-prenatal-diagnosis-of-blakes-pouch-cyst-by-2d-3d-ultrasound-with-cristal-and-realistic-vue-application
#4
Gabriele Tonni, Gianpaolo Grisolia, Paolo Zampriolo, Edward Araujo Júnior, Rodrigo Ruano
INTRODUCTION: Blake's pouch cyst (BPC) represents an abnormal development of the posterior membranous area of the fetal brain. MATERIAL AND METHODS: Two- and three-dimensional ultrasound with Cristal and Realistic Vue were used to characterized the early prenatal diagnosis. RESULTS: At 9 weeks and 5 days a ballooning in the posterior fossa and resulting in an enlarged intracranial translucency (IT) was detected by 3D ultrasound using Cristal Vue in "inversion" mode and Cristal plus Realistic Vue...
May 21, 2018: Fetal and Pediatric Pathology
https://www.readbyqxmd.com/read/29778038/hierarchically-three-dimensional-3d-nanotubular-sea-urchin-shaped-iron-oxide-and-its-application-in-heavy-metal-removal-and-solar-induced-photocatalytic-degradation
#5
Soon Chang Lee, Yesul Jeong, Youn Jung Kim, Hyeran Kim, Hyun Uk Lee, Young-Chul Lee, Sang Moon Lee, Hae Jin Kim, Ha-Rim An, Myoung Gyu Ha, Go-Woon Lee, Young-Seak Lee, Gaehang Lee
In this study, hierarchically three-dimensional (3D) nanotubular sea urchin-shaped iron oxide nanostructures (3D-Fe2 O3 ) were synthesized by a facile and rapid ultrasound irradiation method. Additives, templates, inert gas atmosphere, pH regulation, and other complicated procedures were not required. Dense 3D-Fe2 O3 with a relatively large Brunauer-Emmett-Teller (BET) surface area of 129.4 m2 /g was synthesized within 23 min, and the BET surface area was further improved to 282.7 m2 /g by a post heat-treatment process...
April 23, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29774184/a-systematic-review-of-clinical-value-of-three-dimensional-printing-in-renal-disease
#6
Zhonghua Sun, Dongting Liu
The aim of this systematic review is to analyse current literature related to the clinical value of three-dimensional (3D) printed models in renal disease. A literature search of PubMed and Scopus databases was performed to identify studies reporting the clinical application and usefulness of 3D printed models in renal disease. Fifteen studies were found to meet the selection criteria and were included in the analysis. Eight of them provided quantitative assessments with five studies focusing on dimensional accuracy of 3D printed models in replicating renal anatomy and tumour, and on measuring tumour volume between 3D printed models and original source images and surgical specimens, with mean difference less than 10%...
April 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29772066/3d-specific-absorption-rate-estimation-from-high-intensity-focused-ultrasound-sonications-using-the-green-s-function-heat-kernel
#7
Nicholas J Freeman, Henrik Odéen, Dennis L Parker
PURPOSE: Evaluate a numerical inverse Green's function method of deriving specific absorption rates (SARs) from high intensity focused ultrasound (HIFU) sonications given tissue parameters (thermal conductivity, specific heat capacity, and mass density) and 3-D magnetic resonance imaging (MRI) temperature measurements. METHODS: SAR estimates were evaluated using simulations and MR temperature measurements from HIFU sonications. For simulations, a "true" SAR was calculated using the hybrid angular spectrum method for ultrasound simulations...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29764692/combined-high-dose-rate-brachytherapy-and-external-beam-radiotherapy-for-clinically-localised-prostate-cancer
#8
Iosif Strouthos, Georgios Chatzikonstantinou, Nikolaos Zamboglou, Natasa Milickovic, Sokratis Papaioannou, Dimitra Bon, Constantinos Zamboglou, Claus Rödel, Dimos Baltas, Nikolaos Tselis
PURPOSE: To report the clinical outcomes and treatment-related toxicities after combined high-dose-rate (HDR) brachytherapy (BRT) with external beam radiotherapy (EBRT) for patients with clinically localised high-risk prostate cancer. MATERIAL AND METHODS: Between 2008 and 2012, three hundred and three consecutive patients with organ-confined high-risk prostate cancer were treated with definitive radiotherapy consisting of HDR-BRT followed by supplemental EBRT. The transrectal 3D-ultrasound-based HDR-BRT boost consisted of two single-fraction implants of 10...
May 12, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29759948/measuring-relative-positions-and-orientations-of-the-tibia-with-respect-to-the-femur-using-one-channel-3d-tracked-a-mode-ultrasound-tracking-system-a-cadaveric-study
#9
Kenan Niu, Jasper Homminga, Victor Sluiter, André Sprengers, Nico Verdonschot
The purpose of this study is to investigate the technical feasibility of measuring relative positions and orientations of the tibia with respect to the femur in an in-vitro experiment by using a 3D-tracked A-mode ultrasound system and to determine its accuracy of angular and translational measurements. As A-mode ultrasound is capable of detecting bone surface through soft tissue in a non-invasive manner, the combination of a single A-mode ultrasound transducer with an optical motion tracking system provides the possibility for digitizing the 3D locations of bony points at different anatomical regions on the thigh and the shank...
May 11, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29751910/selective-determination-of-caffeine-in-foods-with-3d-graphene-based-ultrasound-assisted-magnetic-solid-phase-extraction
#10
Afshin Rahimi, Mohammad Ali Zanjanchi, Sadjad Bakhtiari, Mohammad Dehsaraei
An efficient method was applied for extraction of caffeine in food samples. Three-dimensional graphene-Fe3 O4 (3D-G-Fe3 O4 ) nanoparticles was successfully synthesized and used as adsorbent in magnetic solid phase extraction (MSPE) step. The properties of synthesized adsorbent were characterized by fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) methods...
October 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29743525/design-characterization-and-in-vivo-performance-of-synthetic-2-mm-diameter-vessel-grafts-made-of-pva-gelatin-blends
#11
M Atlan, T Simon-Yarza, J M Ino, V Hunsinger, L Corté, P Ou, R Aid-Launais, M Chaouat, D Letourneur
Since the development of the first vascular grafts, fabrication of vessel replacements with diameters smaller than 6 mm remains a challenge. The present work aimed to develop PVA (poly (vinyl alcohol))-gelatin hybrids as tubes suitable for replacement of very small vessels and to evaluate their performance using a rat abdominal aorta interposition model. PVA-gelatin hybrid tubes with internal and external diameters of 1.4 mm and 1.8 mm, respectively, composed of 4 different gelatin ratios were prepared using a one-step strategy with both chemical and physical crosslinking...
May 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29740603/stretchable-ultrasonic-transducer-arrays-for-three-dimensional-imaging-on-complex-surfaces
#12
Hongjie Hu, Xuan Zhu, Chonghe Wang, Lin Zhang, Xiaoshi Li, Seunghyun Lee, Zhenlong Huang, Ruimin Chen, Zeyu Chen, Chunfeng Wang, Yue Gu, Yimu Chen, Yusheng Lei, Tianjiao Zhang, NamHeon Kim, Yuxuan Guo, Yue Teng, Wenbo Zhou, Yang Li, Akihiro Nomoto, Simone Sternini, Qifa Zhou, Matt Pharr, Francesco Lanza di Scalea, Sheng Xu
Ultrasonic imaging has been implemented as a powerful tool for noninvasive subsurface inspections of both structural and biological media. Current ultrasound probes are rigid and bulky and cannot readily image through nonplanar three-dimensional (3D) surfaces. However, imaging through these complicated surfaces is vital because stress concentrations at geometrical discontinuities render these surfaces highly prone to defects. This study reports a stretchable ultrasound probe that can conform to and detect nonplanar complex surfaces...
March 2018: Science Advances
https://www.readbyqxmd.com/read/29739513/ultrasound-assisted-preparation-of-a-nanostructured-zinc-ii-amine-pillar-metal-organic-framework-as-a-potential-sorbent-for-2-4-dichlorophenol-adsorption-from-aqueous-solution
#13
Reza Abazari, Ghazal Salehi, Ali Reza Mahjoub
Using a green and simple route with ultrasound illumination under atmospheric pressure and at room temperature, the nanosized preparation of a Zn(II) metal-organic framework, [Zn(ATA)(BPD)]∞ (ATA = 2-aminoterephthalic acid), BPD = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene), having nano-plate shape and 3D channel framework, was considered and the product was named as compound 1. The X-ray diffraction (XRD), scanning electron microscopy (SEM), IR spectroscopy, Brunauer-Emmett-Teller (BET), and thermogravimetric analysis (TGA) were used for characterization of the synthesized micro/nano-structures...
September 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29716277/effects-of-the-container-on-structure-function-with-impedance-map-analysis-of-dense-scattering-media
#14
Adam C Luchies, Michael L Oelze
Quantitative ultrasound (QUS) can be used to estimate acoustic properties of tissue microstructure. In one approach to QUS, the backscatter coefficient (BSC) is utilized to quantify and classify tissue state. From the BSC, parametric models can be constructed to relate the frequency-dependent BSC to geometrical properties of the underlying tissue. However, most of these parametric models are based on analytic expressions (e.g., Gaussian function) and not on actual tissue morphology. Impedance map analysis has been proposed to help identify sources of ultrasonic scattering in tissues and to develop improved models of scattering...
April 2018: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29715691/vp-nets-efficient-automatic-localization-of-key-brain-structures-in-3d-fetal-neurosonography
#15
Ruobing Huang, Weidi Xie, J Alison Noble
Three-dimensional (3D) fetal neurosonography is used clinically to detect cerebral abnormalities and to assess growth in the developing brain. However, manual identification of key brain structures in 3D ultrasound images requires expertise to perform and even then is tedious. Inspired by how sonographers view and interact with volumes during real-time clinical scanning, we propose an efficient automatic method to simultaneously localize multiple brain structures in 3D fetal neurosonography. The proposed View-based Projection Networks (VP-Nets), uses three view-based Convolutional Neural Networks (CNNs), to simplify 3D localizations by directly predicting 2D projections of the key structures onto three anatomical views...
April 23, 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29708204/through-the-hololens%C3%A2-looking-glass-augmented-reality-for-extremity-reconstruction-surgery-using-3d-vascular-models-with-perforating-vessels
#16
Philip Pratt, Matthew Ives, Graham Lawton, Jonathan Simmons, Nasko Radev, Liana Spyropoulou, Dimitri Amiras
Precision and planning are key to reconstructive surgery. Augmented reality (AR) can bring the information within preoperative computed tomography angiography (CTA) imaging to life, allowing the surgeon to 'see through' the patient's skin and appreciate the underlying anatomy without making a single incision. This work has demonstrated that AR can assist the accurate identification, dissection and execution of vascular pedunculated flaps during reconstructive surgery. Separate volumes of osseous, vascular, skin, soft tissue structures and relevant vascular perforators were delineated from preoperative CTA scans to generate three-dimensional images using two complementary segmentation software packages...
2018: European radiology experimental
https://www.readbyqxmd.com/read/29705327/numerical-modelling-of-acoustic-pressure-fields-to-optimize-the-ultrasonic-cleaning-technique-for-cylinders
#17
Habiba Lais, Premesh S Lowe, Tat-Hean Gan, Luiz C Wrobel
Fouling build up is a well-known problem in the offshore industry. Accumulation of fouling occurs in different structures, e.g. offshore pipes, ship hulls, floating production platforms. The type of fouling that accumulates is dependent on environmental conditions surrounding the structure itself. Current methods deployed for fouling removal span across hydraulic, chemical and manual, all sharing the common disadvantage of necessitating halting production for the cleaning process to commence. Conventionally, ultrasound is used in ultrasonic baths to clean a submerged component by the generation and implosion of cavitation bubbles on the fouled surface; this method is particularly used in Reverse Osmosis applications...
July 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29701618/evaluating-the-therapeutic-success-of-keloids-treated-with-cryotherapy-and-intralesional-corticosteroids-using-noninvasive-objective-measures
#18
Hannah Schwaiger, Markus Reinholz, Julian Poetschke, Thomas Ruzicka, Gerd Gauglitz
BACKGROUND: Intralesional corticosteroid injections combined with cryotherapy are considered a first-line therapy for keloids. However, objective evaluation on its efficacy is widely missing. OBJECTIVE: In this study, the authors evaluated the therapeutic benefits of cryotherapy directly followed by intralesional crystalline triamcinolone acetonide injections using ultrasound and a 3D topographic imaging device. MATERIALS AND METHODS: Fifteen patients with keloids were treated with cryotherapy and intralesional injections of triamcinolone acetonide for a total of 4 times at intervals of 4 weeks...
May 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29693610/the-application-of-an-ultrasound-tomography-algorithm-in-a-novel-ring-3d-ultrasound-imaging-system
#19
Chang Liu, Chenyang Xue, Binzhen Zhang, Guojun Zhang, Changde He
Currently, breast cancer is one of the most common cancers in women all over the world. A novel 3D breast ultrasound imaging ring system using the linear array transducer is proposed to decrease costs, reduce processing difficulties, and improve patient comfort as compared to modern day breast screening systems. The 1 × 128 Piezoelectric Micromachined Ultrasonic Transducer (PMUT) linear array is placed 90 degrees cross-vertically. The transducer surrounds the mammary gland, which allows for non-contact detection...
April 25, 2018: Sensors
https://www.readbyqxmd.com/read/29691766/characterization-of-the-hemodynamic-wall-shear-stresses-in-human-umbilical-vessels-from-normal-and-intrauterine-growth-restricted-pregnancies
#20
Shier Nee Saw, Yu Wei Poh, Dawn Chia, Arijit Biswas, Citra Nurfarah Zaini Mattar, Choon Hwai Yap
Significant reductions in blood flow and umbilical diameters were reported in pregnancies affected by intrauterine growth restriction (IUGR) from placental insufficiency. However, it is not known if IUGR umbilical blood vessels experience different hemodynamic wall shear stresses (WSS) compared to normal umbilical vessels. As WSS is known to influence vasoactivity and vascular growth and remodeling, which can regulate flow rates, it is important to study this parameter. In this study, we aim to characterize umbilical vascular WSS environment in normal and IUGR pregnancies, and evaluate correlation between WSS and vascular diameter, and gestational age...
April 24, 2018: Biomechanics and Modeling in Mechanobiology
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