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https://www.readbyqxmd.com/read/27933282/myocardial-perfusion-scintigraphy-dosimetry-optimal-use-of-spect-and-spect-ct-technologies-in-stress-first-imaging-protocol
#1
REVIEW
M Lecchi, S Malaspina, C Scabbio, V Gaudieri, A Del Sole
PURPOSE: Over the past decade, nuclear medicine experts have been seeking to minimize patient exposure to radiation in myocardial perfusion scintigraphy (MPS). This review describes the latest technological innovations in MPS, particularly with regard to dose reduction. METHODS: We searched in PubMed for original clinical papers in English, published after 2008, using the following research criteria: (dose) and ((reduction) or (reducing)) and ((myocardial) or (cardiac) or (heart)) and ((nuclear medicine) or (nuclear imaging) or (radionuclide) or (scintigraphy) or (SPET) or (SPECT))...
2016: Clinical and Translational Imaging: Reviews in Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/27933095/direct-derivation-of-maize-plant-and-crop-height-from-low-cost-time-of-flight-camera-measurements
#2
Martin Hämmerle, Bernhard Höfle
BACKGROUND: In agriculture, information about the spatial distribution of crop height is valuable for applications such as biomass and yield estimation, or increasing field work efficiency in terms of fertilizing, applying pesticides, irrigation, etc. Established methods for capturing crop height often comprise restrictions in terms of cost and time efficiency, flexibility, and temporal and spatial resolution of measurements. Furthermore, crop height is mostly derived from a measurement of the bare terrain prior to plant growth and measurements of the crop surface when plants are growing, resulting in the need of multiple field campaigns...
2016: Plant Methods
https://www.readbyqxmd.com/read/27932525/the-pharyngoesophageal-segment-after-total-laryngectomy
#3
Beatriz Arenaz Búa, Rolf Olsson, Ulla Westin, Roland Rydell
OBJECTIVE: The aim of the present study was to characterize the pharyngoesophageal segment in laryngectomees who rated themselves as functional tracheoesophageal speakers. METHODS: Voice perceptual assessment, high-resolution videomanometry of swallowing and phonation, and high-speed camera recording during phonation provided information about the anatomy and function of the pharyngoesophageal segment. RESULTS: Fourteen patients were included in the study...
December 7, 2016: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/27932150/real-time-intraoperative-fluorescent-lymphography-a-new-technique-for-lymphatic-sparing-surgery
#4
G Ietto, F Amico, G Soldini, C Chiappa, M Franchin, D Iovino, A Romanzi, G Saredi, E Cassinotti, L Boni, M Tozzi, G Carcano
BACKGROUND: Many surgical procedures can produce persistent lymphorrhea, lymphoceles, and lymphedema after lymph node and lymph vessel damage. Appropriate visualization of the lymphatic system is challenging. Indocyanine green (ICG) is a well-known nontoxic dye for lymphatic flow evaluation. ICG fluorescence-guided lymphography has emerged as a promising technique for intraoperative lymphatic mapping. OBJECTIVE: Our goal was to develop a high spatial resolution, real-time intraoperative imaging technique to avoid or recognize early deep lymphatic vessel damage...
November 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27930663/livephantom-retrieving-virtual-world-light-data-to-real-environments
#5
Hoshang Kolivand, Mark Billinghurst, Mohd Shahrizal Sunar
To achieve realistic Augmented Reality (AR), shadows play an important role in creating a 3D impression of a scene. Casting virtual shadows on real and virtual objects is one of the topics of research being conducted in this area. In this paper, we propose a new method for creating complex AR indoor scenes using real time depth detection to exert virtual shadows on virtual and real environments. A Kinect camera was used to produce a depth map for the physical scene mixing into a single real-time transparent tacit surface...
2016: PloS One
https://www.readbyqxmd.com/read/27929730/detection-of-glaucoma-using-image-processing-techniques-a-critique
#6
B Naveen Kumar, R P Chauhan, Nidhi Dahiya
OBJECTIVE: The primary objective of this article is to present a summary of different types of image processing methods employed for the detection of glaucoma, a serious eye disease. INTRODUCTION: Glaucoma affects the optic nerve in which retinal ganglion cells become dead, and this leads to loss of vision. The principal cause is the increase in intraocular pressure, which occurs in open-angle and angle-closure glaucoma, the two major types affecting the optic nerve...
December 8, 2016: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/27929459/perturbations-of-circulating-mirnas-in-irritable-bowel-syndrome-detected-using-a-multiplexed-high-throughput-gene-expression-platform
#7
Nicolaas H Fourie, Ralph M Peace, Sarah K Abey, LeeAnne B Sherwin, John W Wiley, Wendy A Henderson
The gene expression platform assay allows for robust and highly reproducible quantification of the expression of up to 800 transcripts (mRNA or miRNAs) in a single reaction. The miRNA assay counts transcripts by directly imaging and digitally counting miRNA molecules that are labeled with color-coded fluorescent barcoded probe sets (a reporter probe and a capture probe). Barcodes are hybridized directly to mature miRNAs that have been elongated by ligating a unique oligonucleotide tag (miRtag) to the 3' end...
November 30, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27929424/a-height-estimation-approach-for-terrain-following-flights-from-monocular-vision
#8
Igor S G Campos, Erickson R Nascimento, Gustavo M Freitas, Luiz Chaimowicz
In this paper, we present a monocular vision-based height estimation algorithm for terrain following flights. The impressive growth of Unmanned Aerial Vehicle (UAV) usage, notably in mapping applications, will soon require the creation of new technologies to enable these systems to better perceive their surroundings. Specifically, we chose to tackle the terrain following problem, as it is still unresolved for consumer available systems. Virtually every mapping aircraft carries a camera; therefore, we chose to exploit this in order to use presently available hardware to extract the height information toward performing terrain following flights...
December 6, 2016: Sensors
https://www.readbyqxmd.com/read/27929181/smartphone-based-hand-held-quantitative-phase-microscope-using-the-transport-of-intensity-equation-method
#9
Xin Meng, Huachuan Huang, Keding Yan, Xiaolin Tian, Wei Yu, Haoyang Cui, Yan Kong, Liang Xue, Cheng Liu, Shouyu Wang
In order to realize high contrast imaging with portable devices for potential mobile healthcare, we demonstrate a hand-held smartphone based quantitative phase microscope using the transport of intensity equation method. With a cost-effective illumination source and compact microscope system, multi-focal images of samples can be captured by the smartphone's camera via manual focusing. Phase retrieval is performed using a self-developed Android application, which calculates sample phases from multi-plane intensities via solving the Poisson equation...
December 8, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27926829/caught-on-camera-intermediates-of-ribosome-recycling
#10
Clarence Ling, Dmitri N Ermolenko
Following termination of protein synthesis, bacterial ribosomes are split into subunits by the joint action of elongation factor G and ribosome recycling factor in the process called ribosome recycling. In this issue of Structure, Fu et al. (2016) describe visualization of transient intermediates of ribosome recycling using time-resolved cryogenic electron microscopy.
December 6, 2016: Structure
https://www.readbyqxmd.com/read/27925585/using-contact-forces-and-robot-arm-accelerations-to-automatically-rate-surgeon-skill-at-peg-transfer
#11
Jeremy Brown, Conor O'Brien, Sarah Leung, Kristoffel Dumon, David Lee, Katherine Kuchenbecker
OBJECTIVE: Most trainees begin learning robotic minimally invasive surgery by performing inanimate practice tasks with clinical robots such as the Intuitive Surgical da Vinci. Expert surgeons are commonly asked to evaluate these performances using standardized five-point rating scales, but doing such ratings is time consuming, tedious, and somewhat subjective. This article presents an automatic skill evaluation system that analyzes only the contact force with the task materials, the broad-bandwidth accelerations of the robotic instruments and camera, and the task completion time...
December 2, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27925233/quantification-and-analysis-of-leaflet-flutter-on-biological-prosthetic-cardiac-valves
#12
Artur H de F Avelar, Jean A Canestri, Camila Bim, Maíra G M Silva, Rudolf Huebner, Marcos Pinotti
The use of porcine or bovine pericardium biological cardiac valves has as its main disadvantage a relatively short lifespan, with failures due to calcification and fatigue. Increasing these valves' durability constitutes a great challenge. An understudied phenomenon is the effect of flutter, an oscillation of the leaflets that can cause regurgitation and accelerate calcification and fatigue. As a starting point to study how to reduce or prevent these oscillations, a method was developed to quantify the flutter frequencies occurring at the point of the valve's full opening...
December 7, 2016: Artificial Organs
https://www.readbyqxmd.com/read/27924930/new-principle-for-measuring-arterial-blood-oxygenation-enabling-motion-robust-remote-monitoring
#13
Mark van Gastel, Sander Stuijk, Gerard de Haan
Finger-oximeters are ubiquitously used for patient monitoring in hospitals worldwide. Recently, remote measurement of arterial blood oxygenation (SpO2) with a camera has been demonstrated. Both contact and remote measurements, however, require the subject to remain static for accurate SpO2 values. This is due to the use of the common ratio-of-ratios measurement principle that measures the relative pulsatility at different wavelengths. Since the amplitudes are small, they are easily corrupted by motion-induced variations...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924389/which-causes-more-ergonomic-stress-laparoscopic-or-open-surgery
#14
Robert Wang, Zhe Liang, Ahmed M Zihni, Shuddhadeb Ray, Michael M Awad
BACKGROUND: There is increasing awareness of potential ergonomic challenges experienced by the laparoscopic surgeon. The purpose of this study is to quantify and compare the ergonomic stress experienced by a surgeon while performing open versus laparoscopic portions of a procedure. We hypothesize that a surgeon will experience greater ergonomic stress when performing laparoscopic surgery. METHODS: We designed a study to measure upper-body muscle activation during the laparoscopic and open portions of sigmoid colectomies in a single surgeon...
December 6, 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/27923706/validation-of-an-arthroscopic-training-device
#15
Samy Bouaicha, Thorsten Jentzsch, Fabrice Scheurer, Stefan Rahm
PURPOSE: To investigate the usefulness and conduct validation of a simulated arthroscopy training device to train basic arthroscopy skills. METHODS: Forty-six participants including 12 novices, 12 intermediates, and 22 experts completed a questionnaire regarding demographics, previous arthroscopic experience, training potential, and statements about the device. Furthermore, participants performed a single task on the arthroscopic training device using the 0° camera and a probe...
December 3, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27923700/continuous-monitoring-of-api-content-api-distribution-and-crushing-strength-after-tableting-via-near-infrared-chemical-imaging
#16
P R Wahl, I Pucher, O Scheibelhofer, M Kerschhaggl, S Sacher, J G Khinast
Near-infrared chemical imaging (NIR-CI) with high-speed cameras based on the push-broom acquisition principle is a rapidly-evolving and can be used for a variety of purposes, from classification (and sorting) of products to mapping spatial distribution of materials. The present study examined if NIR-CI is suitable for tablet manufacturing. To that end, the tablets were introduced into the CI system via a flat belt conveyor. A formulation, which consisted of 4wt.% to 6wt.% caffeine, 5wt.% crospovidone as a disintegrant, 88wt...
December 3, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27922836/a-novel-method-for-full-locomotion-compensation-of-an-untethered-walking-insect
#17
Shunsuke Shigaki, Shunpei Fukushima, Daisuke Kurabayashi, Takeshi Sakurai, Ryohei Kanzaki
In this study, we developed a novel unfixed-type experimental system that we call a '3-DOF servosphere.' This system comprises one sphere and three omniwheels that support the sphere. The measurement method is very simple. An experimental animal is placed on top of the sphere. The position and heading angle of the animal are observed by using a high-speed camera installed above the sphere. Because the system can rotate the sphere with three degrees of freedom (DOFs) independently, the position and heading angle at the origin can be maintained without fixing the body...
December 6, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27922550/a-novel-abcc6-haplotype-is-associated-with-azathioprine-drug-response-in-myasthenia-gravis
#18
Lara Colleoni, Barbara Galbardi, Claudia Barzago, Silvia Bonanno, Sara Franzi, Rita Frangiamore, Giorgia Camera, Maria Foti, Donatella Biancolini, Eleonora Canioni, Lorenzo Maggi, Carlo Antozzi, Renato Mantegazza, Pia Bernasconi, Dimos Kapetis
OBJECTIVE: We investigated the association of single nucleotide polymorphisms (SNPs) in drug-metabolizing enzymes and transporters (DMETs) with the response to azathioprine (AZA) in patients affected by myasthenia gravis (MG) to determine possible genotype-phenotype correlations. PATIENTS AND METHODS: Genomic DNA from 180 AZA-treated MG patients was screened through the Affymetrix DMET platform, which characterizes 1931 SNPs in 225 genes. The significant SNPs, identified to be involved in AZA response, were subsequently validated by allelic discrimination and direct sequencing...
December 2, 2016: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/27922541/effects-of-the-5-ht1a-receptor-agonists-buspirone-and-8-oh-dpat-on-pupil-size-in-common-marmosets
#19
Manato Kotani, Naoko Urushino, Itaru Natsutani, Yuji Ogi, Kazuhito Ikeda
As pupil size is affected by psychotropic drugs in all mammals, it has been used as a well-established clinical indicator for the preclinical and clinical development of novel drugs. It has been reported that activation of the serotonin (5-HT)1A receptor differently affects pupil response in rodents (mydriasis) and humans (miosis). Thus, it is important to establish a quantitative system for measuring pupil size using other species, such as nonhuman primates. Common marmosets have recently attracted a great deal of attention as suitable experimental animals in the psychoneurological field because of handling ease compared with other nonhuman primates and the requirement for small amounts of test drugs...
December 2, 2016: Behavioural Pharmacology
https://www.readbyqxmd.com/read/27921121/a%C3%A2-4d-ultrasound-real-time-tracking-system-for-external-beam-radiotherapy-of-upper-abdominal-lesions-under-breath-hold
#20
Dwi Seno Kuncoro Sihono, Lena Vogel, Christel Weiß, Johannes Thölking, Frederik Wenz, Frank Lohr, Judit Boda-Heggemann, Hansjörg Wertz
BACKGROUND AND PURPOSE: To evaluate a novel four-dimensional (4D) ultrasound (US) tracking system for external beam radiotherapy of upper abdominal lesions under computer-controlled deep-inspiration breath-hold (DIBH). MATERIALS AND METHODS: The tracking accuracy of the research 4D US system was evaluated using two motion phantoms programmed with sinusoidal and breathing patterns to simulate free breathing and DIBH. Clinical performance was evaluated with five healthy volunteers...
December 5, 2016: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
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