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B R Halls, P S Hsu, S Roy, T R Meyer, J R Gord
Single-shot, two-color, volumetric laser-induced fluorescence was demonstrated for three-dimensional (3D), tomographic imaging of the structural properties of the OH radical and temperature field in a turbulent hydrogen-air flame. Two narrowband laser sources were tuned to the Q1 (5) and Q1 (14) transitions of the (1,0) band in the A2 Σ←X2 Π system and illuminated a volumetric region of the flame. Images from eight unique perspectives collected simultaneously from each of the two transitions were used to reconstruct overlapping OH fields with different Boltzmann fractions and map the 3D temperature distribution with nanosecond precision...
June 15, 2018: Optics Letters
J van Tilborg, A J Gonsalves, E H Esarey, C B Schroeder, W P Leemans
Electrically discharged plasma structures, typically several centimeters in length and sub-millimeter in diameter, have been applied to guide laser pulses in laser plasma accelerators and to focus ion and relativistic electron beams in compact, radially symmetric transport configurations. Knowledge of the on-axis plasma density is critical. Traditional density interferometry has been ineffective for these laser-machined structures, while group velocity delay (GVD) techniques involve combining two laser paths with corresponding alignment complexities and stability sensitivities...
June 15, 2018: Optics Letters
M Alizadeh, M M Poplawski, J Fisher, R J T Gorniak, A Dresner, F B Mohamed, A E Flanders
BACKGROUND AND PURPOSE: The zonally magnified oblique multislice EPI (ZOOM-EPI) diffusion-weighted sequence has been visually shown to provide superior MR diffusion image quality compared with the full-FOV single-shot EPI sequence (non-ZOOM-EPI) in the adult cervical spinal cord. The purpose of this study was to examine the diffusion tensor imaging indices in the normal human cervical spinal cord between ZOOMED and non-ZOOMED DTI acquisitions and determine whether DTI values are comparable between direct and indirect age-matched groups...
June 14, 2018: AJNR. American Journal of Neuroradiology
Jisu Hu, Ming Li, Yakang Dai, Chen Geng, Baotong Tong, Zhiyong Zhou, Xue Liang, Wen Yang, Bing Zhang
BACKGROUND: In diffusion-weighted magnetic resonance imaging (DWI) using single-shot echo planar imaging (ss-EPI), both reduced field-of-view (FOV) excitation and sensitivity encoding (SENSE) alone can increase in-plane resolution to some degree. However, when the two techniques are combined to further increase resolution without pronounced geometric distortion, the resulted images are often corrupted by high level of noise and artifact due to the numerical restriction in SENSE. Hence, this study is aimed to provide a reconstruction method to deal with this problem...
June 15, 2018: Biomedical Engineering Online
Jae Hee Woo, Youn Jin Kim, Kwan Chang Kim, Chi Hyo Kim, Jeeyoung Jun
BACKGROUND: Postoperative ipsilateral shoulder pain occurs in 37% to 68% of patients undergoing a thoracotomy. We examined whether interscalene brachial plexus block using a lower concentration of local anesthetic would reduce the incidence of post-thoracotomy ipsilateral shoulder pain with assessment of pulmonary function in patients who underwent a lung lobectomy. METHODS: Forty-four patients who underwent a lung lobectomy were randomly assigned to either the control or the interscalene block group...
June 2018: Medicine (Baltimore)
Diogo Coutinho, Sara Santos, Bruno Gonçalves, Bruno Travassos, Del P Wong, Wolfgang Schöllhorn, Jaime Sampaio
The aim of this study was to identify the effects of a complementary training program based on differential learning approach in the physical, technical, creative and positioning performance of youth football attackers. Fifteen players were allocated into the control (U15C = 9, age: 13.9±0.5 years; U17C = 6, age: 16.1±0.7 years) and the experimental (U15E = 9, age: 14.2±0.8 years; U17E = 6, age: 15.8±0.5 years) groups. The experimental groups participated in 10-weeks of a complementary training program based on differential learning approach to improve physical literacy and players' tactical behavior...
2018: PloS One
Joseph J Pagano, Kelvin Chow, D Ian Paterson, Yoko Mikami, Anna Schmidt, Andrew Howarth, James White, Matthias G Friedrich, Gavin Y Oudit, Justin Ezekowitz, Jason Dyck, Richard B Thompson
BACKGROUND: Understanding cardiac MR T1 mapping values might require examination of the effects of age, gender, and heart failure risk factors. PURPOSE/HYPOTHESIS: To evaluate the effects of gender, age, and presence of heart failure risk factors on myocardial native T1 and extracellular volume fraction (ECV). STUDY TYPE: Retrospective, cross-sectional, observational study. POPULATION: Secondary analysis of cardiac MR data, separated by gender and health status, based on the presence of at least one heart failure risk factor...
June 13, 2018: Journal of Magnetic Resonance Imaging: JMRI
Haresh T Suppiah, Low Chee Yong, Gabriel Choong, Michael Chia
PURPOSE: The purpose of the research was to investigate the sport-specific performance effect of a brief afternoon nap on high-level Asian adolescent student-athletes that were habitually short sleepers. METHODS: In the studies, participants were randomly assigned to a nap or non-nap (reading) condition. In the first study, 12 male shooters (13.8 ± 1.0 yrs) performed a shooting assessment (20 competition shots) with heart rate variability monitored during the assessment...
June 12, 2018: International Journal of Sports Physiology and Performance
Heng Ma, Yue Zhang, Jingjing Chen, Jun Yang
RATIONALE AND OBJECTIVES: Sliding-window conjugate-gradient highly constrained back-projection reconstruction (SW-CG-HYPR) allows whole left ventricular coverage, improved temporal and spatial resolution, and signal-to-noise ratio compared to the conventional 3-slice saturation recovery turbo-fast low-angle shot (SR-Turbo-FLASH) sequence. We prospectively compared the diagnostic value of whole leftventricular coverage myocardial perfusion magnetic resonance imaging (MRI) and conventional 3-slice technique in patients with suspected coronary artery disease (CAD)...
June 7, 2018: Academic Radiology
Victoria P Niederhauser, Lisa C Lindley, Brittany Farabollini
OBJECTIVE: The purpose of this study was to explore if parental barriers to childhood immunizations change over time. DESIGN AND SAMPLE: Using secondary data, a pretest post-test design was employed to measure changes in parental barriers to childhood immunizations in the first 7 months of life. Thirty-nine parent/infant dyads were included in this study. MEASURES: The Searching for Hardship and Obstacles to Shots (SHOTS) Survey was completed by a parent when their infant was between one and 28 days old (prior to their first immunizations) and again when the child was 6-7 months of age...
June 7, 2018: Public Health Nursing
Mounir Landolsi, Lazhar Labiadh, Fayçal Zarrouk, Khaled Maaref, Slaheddine Ghannouchi, Zouhair Tabka, Patrick Lacouture
The aims of this study were to (1) propose a method for evaluating shot-putters mechanical power, (2) investigate the relationship between mechanical work of hand action force (WHAF ), peak power output (PPO) of different limbs and shot-put performance and (3) show which of these two parameters (WHAF , PPO) were the most appropriate to characterize the explosive abilities of the shot-putter. Twelve junior right-handed shot-putters, practised glide technique shot-put throwers (personal best = 13.57  ±  1...
June 5, 2018: European Journal of Sport Science
Matthias R Benz, Georg Bongartz, Johannes M Froehlich, David Winkel, Daniel T Boll, Tobias Heye
PURPOSE: The aim was to investigate the variation of the arterial input function (AIF) within and between various DCE MRI sequences. MATERIAL AND METHODS: A dynamic flow-phantom and steady signal reference were scanned on a 3T MRI using fast low angle shot (FLASH) 2d, FLASH3d (parallel imaging factor (P) = P0, P2, P4), volumetric interpolated breath-hold examination (VIBE) (P = P0, P3, P2 × 2, P2 × 3, P3 × 2), golden-angle radial sparse parallel imaging (GRASP), and time-resolved imaging with stochastic trajectories (TWIST)...
July 2018: European Journal of Radiology
Caineng Wu, Wuhua Ma, Qingyun Cen, Qingxiang Cai, Jiyong Wang, Ying Cao
BACKGROUND: Postoperative supraventricular arrhythmias are common in patients after thoracoscopic lobectomy. Inadequate pain control has long been recognised as a significant risk factor for arrhythmias. The performance of ultrasound-guided (USG) thoracic paravertebral block (PVB) is increasing as an ideal technique for postoperative analgesia. OBJECTIVE: We conducted this study to evaluate whether a single-shot USG thoracic PVB would result in fewer postoperative supraventricular tachycardias (SVT) than intercostal nerve blocks (ICNBs) after thoracoscopic pulmonary resection...
May 29, 2018: European Journal of Anaesthesiology
Caroline P Reinel, Stefan Schuster
Archerfish dislodge aerial prey with water jets and use their predictive C-starts to secure it. Their C-starts turn the fish to the later point of impact and set the speed so that the fish would arrive just in time. The starts are adjusted on the basis of information on speed, direction, timing and horizontal start position of prey movement - sampled during less than 100 ms after prey starts falling. Presently it is unclear, if one essential parameter, the initial height of prey can also be determined during this brief sampling time...
May 24, 2018: Journal of Experimental Biology
Canfeng Li, Hongwei Xu, Bin Shen, Jing Yang, Zongke Zhou, Pengde Kang, Fuxing Pei
Objective: To compare the analgesia effect and clinical rehabilitation between continuous adductor canal block (ACB) and single shot ACB in total knee arthroplasty (TKA).. Methods: Between October 2016 and February 2017, 60 patients with severe knee osteoarthritis undergoing primary unilateral TKA were prospectively recruited in the study. All the patients were randomly allocated into 2 groups and received ultrasound-guided continuous ACB (group A, n =30) or single shot ACB (group B, n =30), respectively...
September 1, 2017: Chinese Journal of Reparative and Reconstructive Surgery
H Xia, P Picart, S Montresor, R Guo, J C Li, O Yusuf Solieman, J-C Durand, M Fages
OBJECTIVES: CAD/CAM ceramic occlusal veneers are increasingly used as therapeutic options. However, little is known about their mechanical behavior under stress, as the response of the prepared tooth that supports it. The aim of this article is to use for the first time 3D color holography to evaluate the behavior of a molar occlusal veneer under stress and the response of the prepared tooth. METHODS: The occlusal surface of a lower molar is prepared to receive a specific monolithic ceramic reconstruction manufactured with a chairside CAD/CAM system...
May 21, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
L C Adams, B Ralla, G Engel, G Diederichs, B Hamm, J Busch, F Fuller, M R Makowski
AIM: To test the potential of unenhanced cardiac- and respiratory-motion-corrected three-dimensional steady-state free precession (3D-SSFP) magnetic resonance imaging (MRI) for the assessment of inferior vena cava (IVC) thrombus in patients with clear-cell renal cell carcinoma (cRCC), compared to standard contrast-enhanced (CE)-MRI and CE-computed tomography (CT). MATERIALS AND METHODS: Eighteen patients with cRCC and IVC thrombus, who received CE-MRI and 3D-SSFP at 1...
May 17, 2018: Clinical Radiology
Ryo Ogawa, Tomoyuki Kido, Masashi Nakamura, Teruhito Kido, Teruhito Mochizuki, Takashi Sugiyama
PURPOSE: We evaluated the associations between gestational age (GA) and lung-to-liver signal intensity ratio (LLSIR) and fetal lung volume (FLV) using magnetic resonance imaging (MRI). Moreover, we evaluated the reproducibility of these measurements. MATERIALS AND METHODS: LLSIR and FLV were measured using single-shot fast spin-echo MRI in 88 consecutive fetuses. The Spearman test was used to assess the relationships between (1) LLSIR and GA, and (2) FLV and GA in 81 fetuses without lung abnormalities...
May 16, 2018: Japanese Journal of Radiology
Ahmed M Elshal, Ahmed M Atwa, Ahmed R El-Nahas, Mohamed A El-Ghar, Asaad Gaber, Essam Elsawy, Abdelwahab Hashem, Yasser Farag, Hashim Farg, Ali Elsorougy, Mohamed Fouda, Hossam Nabeeh, Ahmed Mosbah
PURPOSE: To compare the efficacy of three chemoprophylaxis approaches in prevention of post-transrectal biopsy infectious complications (TBICs). METHODS: Patients were randomly assigned to receive ciprofloxacin 3 days 500 mg B.I.D 3 days starting the night prior to biopsy (standard prophylaxis), augmented prophylaxis using ciprofloxacin and single preprocedure shot of 160 mg gentamicin IM (augmented prophylaxis) and rectal swab culture-based prophylaxis (targeted prophylaxis)...
May 7, 2018: World Journal of Urology
Bhavuk Garg, Manish Gupta, Menaka Singh, Dinesh Kalyanasundaram
BACKGROUND CONTEXT: Spinal deformities are very challenging to treat and have a great risk of neurological complications due to hardware placement during corrective surgery. Various techniques have been introduced to ensure safe and accurate placement of pedicle screws. Patient-specific screw guides with pre-drawn and pre-validated trajectory seems to be an attractive option. PURPOSE: We have focused on developing 3D printing technique for complex spinal deformities in India...
May 3, 2018: Spine Journal: Official Journal of the North American Spine Society
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