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https://www.readbyqxmd.com/read/28438666/how-to-choose-the-right-mr-sequence-for-your-research-question-at-7-t-and-above
#1
José P Marques, David G Norris
The choice of a pulse sequence at ultra-high field can be influenced by a number of considerations and constraints that are not always the same as those at lower fields. Foremost amongst these is of course the information required and the time available, but considerations of static main field- and transmit field- inhomogeneities as well as power deposition can also play an important role. In this review we first briefly examine the characteristics of high field MRI, and then describe the performance and constraints relevant to the major imaging readouts, and their implementation with parallel imaging techniques...
April 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28437940/rydberg-atom-based-radio-frequency-electrometry-using-frequency-modulation-spectroscopy-in-room-temperature-vapor-cells
#2
Santosh Kumar, Haoquan Fan, Harald Kübler, Akbar J Jahangiri, James P Shaffer
Rydberg atom-based electrometry enables traceable electric field measurements with high sensitivity over a large frequency range, from gigahertz to terahertz. Such measurements are particularly useful for the calibration of radio frequency and terahertz devices, as well as other applications like near field imaging of electric fields. We utilize frequency modulated spectroscopy with active control of residual amplitude modulation to improve the signal to noise ratio of the optical readout of Rydberg atom-based radio frequency electrometry...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28433852/efficiency-of-low-versus-high-airline-pressure-in-stunning-cattle-with-a-pneumatically-powered-penetrating-captive-bolt-gun
#3
Steffan Edward Octávio Oliveira, Neville George Gregory, Filipe Antonio Dalla Costa, Troy John Gibson, Mateus José Rodrigues Paranhos da Costa
The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160-175psi, N=82) and high (190psi, N=363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated...
April 13, 2017: Meat Science
https://www.readbyqxmd.com/read/28424822/rapid-non-contrast-magnetic-resonance-imaging-for-post-appendectomy-intra-abdominal-abscess-in-children
#4
Megan H Lee, Eric P Eutsler, Elizabeth F Sheybani, Geetika Khanna
BACKGROUND: Acute appendicitis, especially if perforated at presentation, is often complicated by postoperative abscess formation. The detection of a postoperative abscess relies primarily on imaging. This has traditionally been done with contrast-enhanced computed tomography. Non-contrast magnetic resonance imaging (MRI) has the potential to accurately detect intra-abdominal abscesses, especially with the use of diffusion-weighted imaging (DWI). OBJECTIVE: To evaluate our single-center experience with a rapid non-contrast MRI protocol evaluating post-appendectomy abscesses in children with persistent postsurgical symptoms...
April 20, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28403398/systematic-review-of-the-systemic-concentrations-of-local-anaesthetic-after-transversus-abdominis-plane-block-and-rectus-sheath-block
#5
J Rahiri, J Tuhoe, D Svirskis, N J Lightfoot, P B Lirk, A G Hill
Background.: Safe and efficacious modalities of perioperative analgesia are essential for enhanced recovery after surgery. Truncal nerve blocks are one potential adjunct for analgesia of the abdominal wall, and in recent years their popularity has increased. Transversus abdominis plane block (TAPB) and rectus sheath block (RSB) have been shown to reduce morphine consumption and improve pain relief after abdominal surgery. These blocks typically require large volumes of local anaesthetic (LA)...
April 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28394667/differences-between-acoustic-trauma-and-other-types-of-acute-noise-induced-hearing-loss-in-terms-of-treatment-and-hearing-prognosis
#6
Tetsuro Wada, Hajime Sano, Shin-Ya Nishio, Ryosuke Kitoh, Tetsuo Ikezono, Satoshi Iwasaki, Kimitaka Kaga, Atsushi Matsubara, Tatsuo Matsunaga, Takaaki Murata, Yasushi Naito, Mikio Suzuki, Haruo Takahashi, Testuya Tono, Hiroshi Yamashita, Akira Hara, Shin-Ichi Usami
OBJECTIVES: To evaluate the differences between acoustic trauma (AT) and other types of acute noise-induced hearing loss (ANIHL), we performed a literature search and case reviews. METHODS: The literature search based on online databases was completed in September 2016. Articles on ANIHL and steroid treatment for human subjects were reviewed. The source sounds and treatment sequelae of our accumulated cases were also reviewed. Hearing loss caused by gun-shots and explosions was categorized into the AT group, while hearing loss caused by concerts and other noises was categorized into the ANIHL group...
April 10, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28385346/timing-of-surgical-antimicrobial-prophylaxis-a-phase-3-randomised-controlled-trial
#7
Walter P Weber, Edin Mujagic, Marcel Zwahlen, Marcel Bundi, Henry Hoffmann, Savas D Soysal, Marko Kraljević, Tarik Delko, Marco von Strauss, Lukas Iselin, Richard X Sousa Da Silva, Jasmin Zeindler, Rachel Rosenthal, Heidi Misteli, Christoph Kindler, Peter Müller, Ramon Saccilotto, Andrea Kopp Lugli, Mark Kaufmann, Lorenz Gürke, Daniel Oertli, Evelin Bucheli-Laffer, Julia Landin, Andreas F Widmer, Christoph A Fux, Walter R Marti
BACKGROUND: Based on observational studies, administration of surgical antimicrobial prophylaxis (SAP) for the prevention of surgical site infection (SSI) is recommended within 60 min before incision. However, the precise optimum timing is unknown. This trial compared early versus late administration of SAP before surgery. METHODS: In this phase 3 randomised controlled superiority trial, we included general surgery adult inpatients (age ≥18 years) at two Swiss hospitals in Basel and Aarau...
April 3, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28385029/improvements-in-access-and-care-through-the-affordable-care-act
#8
Julie A Schmittdiel, Jennifer C Barrow, Deanne Wiley, Lin Ma, Danny Sam, Christopher V Chau, Susan M Shetterly
OBJECTIVES: To examine the impact of enrolling in a healthcare plan through the Affordable Care Act (ACA) healthcare exchanges on self-reported access to care. STUDY DESIGN: Cohort study using self-reported data of patients newly enrolled in Kaiser Permanente California and Kaiser Permanente Colorado through the ACA healthcare exchanges for coverage beginning January 1, 2014. METHODS: Baseline and follow-up surveys conducted via mail and telephone, with response rates of 45% and 51%, respectively...
March 1, 2017: American Journal of Managed Care
https://www.readbyqxmd.com/read/28376261/theoretical-investigation-of-the-noise-performance-of-active-pixel-imaging-arrays-based-on-polycrystalline-silicon-thin-film-transistors
#9
Martin Koniczek, Larry E Antonuk, Youcef El-Mohri, Albert K Liang, Qihua Zhao
PURPOSE: Active matrix flat-panel imagers, which typically incorporate a pixelated array with one a-Si:H thin-film transistor (TFT) per pixel, have become ubiquitous by virtue of many advantages, including large monolithic construction, radiation tolerance and high DQE. However, at low exposures such as those encountered in fluoroscopy, digital breast tomosynthesis and breast computed tomography, DQE is degraded due to the modest average signal generated per interacting x-ray relative to electronic additive noise levels of ~1000 e, or greater...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28372420/filamentary-probe-on-the-compass-tokamak
#10
K Kovarik, I Duran, J Stockel, J Seidl, J Adamek, M Spolaore, N Vianello, P Hacek, M Hron, R Panek
This paper describes a new filamentary probe recently introduced on the COMPASS tokamak. It allows the measurement of electrostatic and magnetic properties of the filaments and their changes in dependence on distance from the separatrix in the region between a divertor and midplane. The probe head is mounted on a manipulator moving the probe radially on a shot-to-shot basis. This configuration is suitable for the long term statistical measurement of the plasma filaments and the measurement of their evolution during their propagation from the separatrix to the wall...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28368971/efficacy-and-safety-of-buprenorphine-in-peripheral-nerve-blocks-a-meta-analysis-of-randomised-controlled-trials
#11
Alexander Schnabel, Sylvia U Reichl, Peter K Zahn, Esther M Pogatzki-Zahn, Christine H Meyer-Frießem
BACKGROUND: The duration of analgesia provided by nerve blocks is limited if local anaesthetics are administered alone. Therefore, a variety of additives to local anaesthetics have been investigated to prolong postoperative analgesia following single-shot nerve blocks. OBJECTIVE(S): The aims of the current meta-analysis were to assess the efficacy and safety of the addition of perineural buprenorphine to local anaesthetic compared with local anaesthetic alone, or combined with systemic administration of buprenorphine, or other perineural opioids for peripheral nerve blocks...
March 31, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28366139/-attitudes-of-adult-asthma-patients-towards-influenza-vaccination
#12
COMPARATIVE STUDY
Zeynep Çelebi Sözener, Mehmet Mısırlıgil, Pamir Çerçi, Ömür Aydın, Reşat Kendirlinan, Betül Sin, Zeynep Mısırlıgil
Introduction: It is known that viral infections trigger exacerbations in asthma patients.There are conflicting reports on whether influenza vaccine is preventive or not. In this study, we aimed to evaluate asthmatic patient's attitude towards influenza vaccine and to determine which factors affect this attitude. Materials and Methods: A questionnaire involving data about demographic information, co-morbidities, frequency of viral upper respiratory tract infections, subject's influenza vaccination status and attitude towards vaccination had been filled for our outpatient clinic asthma patients and also for healthy controls...
December 2016: Tüberküloz Ve Toraks
https://www.readbyqxmd.com/read/28364665/doppler-limited-high-resolution-spectrum-and-vpt2-assisted-assignment-of-the-c-h-stretch-of-ch2br2
#13
Ibrahim Sadiek, Gernot Friedrichs
The Doppler limited non-saturated rotationally resolved infrared spectra of the symmetric and asymmetric CH-stretch bands of CH2Br2 have been measured. A continuous wave cavity ringdown setup with a widely tunable Mid-IR-OPO laser light source yielded a single-shot minimum absorption of 4.9×10(-8)cm(-1). In contrast to the heavily congested ν1 band, the ν6 band showed partially resolved rotational features that may serve as suitable absorption targets in future environmental detection schemes for CH2Br2...
March 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28362762/phase-noise-analysis-of-swept-source-optical-coherence-tomography-systems
#14
Yuye Ling, Yu Gan, Xinwen Yao, Christine P Hendon
We propose a new model to characterize the phase noise in swept-source optical coherence tomography (SS-OCT). The new model explicitly incorporates scanning variability, timing jitter, and sample location in addition to intensity noise (shot noise). The model was analyzed and validated by using both Monte Carlo methods and experiments. We suggest that the proposed model can be used as a guideline for future SS-OCT experimental designs.
April 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28355263/the-effect-of-a-sequential-structure-of-practice-for-the-training-of-perceptual-cognitive-skills-in-tennis
#15
David P Broadbent, Paul R Ford, Dominic A O'Hara, A Mark Williams, Joe Causer
OBJECTIVE: Anticipation of opponent actions, through the use of advanced (i.e., pre-event) kinematic information, can be trained using video-based temporal occlusion. Typically, this involves isolated opponent skills/shots presented as trials in a random order. However, two different areas of research concerning representative task design and contextual (non-kinematic) information, suggest this structure of practice restricts expert performance. The aim of this study was to examine the effect of a sequential structure of practice during video-based training of anticipatory behavior in tennis, as well as the transfer of these skills to the performance environment...
2017: PloS One
https://www.readbyqxmd.com/read/28332854/the-intravoxel-incoherent-motion-mri-of-lateral-pterygoid-muscle-a-quantitative-analysis-in-patients-with-temporomandibular-joint-disorders
#16
Supak Ngamsom, Shin Nakamura, Junichiro Sakamoto, Shinya Kotaki, Akemi Tetsumura, Tohru Kurabayashi
OBJECTIVES: To quantitatively evaluate diffusion and perfusion status of lateral pterygoid muscle (LPM) in patients with temporomandibular joint disorder (TMD) by intravoxel incoherent motion (IVIM) imaging and to correlate with findings on temporomandibular joints (TMJs) by conventional MRI. METHODS: 42 patients with TMD underwent MRI. To assess IVIM parameters, diffusion-weighted imaging was obtained by spin-echo-based single-shot echoplanar imaging. Regions of interest were created on all diffusion-weighted images of the superior belly of the lateral pterygoid (SLP) and inferior belly of the lateral pterygoid (ILP) at b-values 0-500 s mm(-2)...
March 23, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28330373/readout-segmented-echo-planar-diffusion-weighted-imaging-in-the-assessment-of-orbital-tumors-comparison-with-conventional-single-shot-echo-planar-imaging-in-image-quality-and-diagnostic-performance
#17
Xiaoquan Xu, Yanjun Wang, Hao Hu, Guoyi Su, Hu Liu, Haibin Shi, Feiyun Wu
Background Readout-segmented echo-planar imaging (RS-EPI) could improve the imaging quality of diffusion-weighted imaging (DWI) in various organs. However, whether it could improve the imaging quality and diagnostic performance for the patients with orbital tumors is still unknown. Purpose To compare the image quality and diagnostic performance of RS-EPI DWI with that of conventional single-shot EPI (SS-EPI) DWI in patients with orbital tumors. Material and Methods SS-EPI and RS-EPI DW images of 32 patients with pathologically diagnosed orbital tumors were retrospectively analyzed...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28321915/acceleration-of-asl-based-time-resolved-mr-angiography-by-acquisition-of-control-and-labeled-images-in-the-same-shot-actress
#18
Yuriko Suzuki, Noriyuki Fujima, Tetsuo Ogino, James Alastair Meakin, Akira Suwa, Hiroyuki Sugimori, Marc Van Cauteren, Matthias J P van Osch
PURPOSE: Noncontrast 4D-MR-angiography (MRA) using arterial spin labeling (ASL) is beneficial because high spatial and temporal resolution can be achieved. However, ASL requires acquisition of labeled and control images for each phase. The purpose of this study is to present a new accelerated 4D-MRA approach that requires only a single control acquisition, achieving similar image quality in approximately half the scan time. METHODS: In a multi-phase Look-Locker sequence, the first phase was used as the control image and the labeling pulse was applied before the second phase...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321908/reduced-field-of-view-single-shot-spiral-perfusion-imaging
#19
Yang Yang, Li Zhao, Xiao Chen, Peter W Shaw, Jorge A Gonzalez, Frederick H Epstein, Craig H Meyer, Christopher M Kramer, Michael Salerno
PURPOSE: To develop a single-shot spiral perfusion pulse sequence with outer-volume suppression (OVS) to achieve whole-heart coverage with a short temporal footprint of 10 ms per slice location. METHODS: A highly accelerated single-shot variable density spiral pulse sequence with an integrated OVS module for reduced field of view (rFOV) perfusion imaging with 2 mm spatial resolution was developed and evaluated in simulations, phantom experiments and in clinical patients with (n = 8) or without (n = 8) OVS...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28303489/in-vivo-dce-mri-for-the-discrimination-between-glioblastoma-and-radiation-necrosis-in-rats
#20
Julie Bolcaen, Benedicte Descamps, Marjan Acou, Karel Deblaere, Caroline Van den Broecke, Tom Boterberg, Christian Vanhove, Ingeborg Goethals
PURPOSE: In this study, the potential of semiquantitative and quantitative analysis of dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) was investigated to differentiate glioblastoma (GB) from radiation necrosis (RN) in rats. PROCEDURES: F98 GB growth was seen on MRI 8-23 days post-inoculation (n = 15). RN lesions developed 6-8 months post-irradiation (n = 10). DCE-MRI was acquired using a fast low-angle shot (FLASH) sequence. Regions of interest (ROIs) encompassed peripheral contrast enhancement in GB (n = 15) and RN (n = 10) as well as central necrosis within these lesions (GB (n = 4), RN (n = 3))...
March 16, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
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