keyword
MENU ▼
Read by QxMD icon Read
search

Pulse radiofrequency

keyword
https://www.readbyqxmd.com/read/28942118/carpal-tunnel-syndrome-effectiveness-of-physical-therapy-and-electrophysical-modalities-an-updated-systematic-review-of-randomized-controlled-trials
#1
REVIEW
Bionka M A Huisstede, Peter Hoogvliet, Thierry P C Franke, Manon S Randsdorp, Bart W Koes
OBJECTIVE: To review scientific literature studying the effectiveness of physical therapy and electrophysical modalities for carpal tunnel syndrome (CTS). DATA SOURCES: The Cochrane Library, PubMed, EMBASE, CINAHL, and PEDro. STUDY SELECTION: Two reviewers independently applied the inclusion criteria to select potential eligible studies. DATA EXTRACTION: Two reviewers independently extracted the data and assessed the methodological quality using the Cochrane Risk of Bias Tool...
September 20, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28940355/whole-brain-inhomogeneous-magnetization-transfer-ihmt-imaging-sensitivity-enhancement-within-a-steady-state-gradient-echo-sequence
#2
Samira Mchinda, Gopal Varma, Valentin H Prevost, Arnaud Le Troter, Stanislas Rapacchi, Maxime Guye, Jean Pelletier, Jean-Philippe Ranjeva, David C Alsop, Guillaume Duhamel, Olivier M Girard
PURPOSE: To implement, characterize, and optimize an interleaved inhomogeneous magnetization transfer (ihMT) gradient echo sequence allowing for whole-brain imaging within a clinically compatible scan time. THEORY AND METHODS: A general framework for ihMT modelling was developed based on the Provotorov theory of radiofrequency saturation, which accounts for the dipolar order underpinning the ihMT effect. Experimental studies and numerical simulations were performed to characterize and optimize the ihMT-gradient echo dependency with sequence timings, saturation power, and offset frequency...
September 23, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28934800/comparison-of-intraarticular-pulsed-radiofrequency-and-intraarticular-corticosteroid-injection-for-management-of-cervical-facet-joint-pain
#3
Ji Woon Lim, Yun-Woo Cho, Dong Gyu Lee, Min Cheol Chang
BACKGROUND: Disorders of the facet joints are some of the most common sources of chronic spinal pain. Facet joint pain is responsible for approximately 50% of patients with chronic neck pain. Pulsed radiofrequency (PRF) stimulation, after placing needle electrodes into the joint space, has been recently reported for the management of joint pain. OBJECTIVE: The aim of this study was to evaluate the effect of intraarticular (IA) PRF for the management of cervical facet joint (CFJ) pain...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28934792/effects-of-pulsed-versus-conventional-versus-combined-radiofrequency-for-the-treatment-of-trigeminal-neuralgia-a-prospective-study
#4
Abdelraheem Elawamy, Esam Eldein Mohamed Abdalla, Ghaydaa A Shehata
BACKGROUND: During radiofrequency bursts of energy are applied to nervous tissue. The clinical advantages of this treatment remain unclear. OBJECTIVES: We compared the effectiveness and pain relief for idiopathic trigeminal neuralgia (TN) after continuous radiofrequency (CRF), pulsed radiofrequency (PRF), and combined continuous and pulsed radiofrequency (CCPRF) treatment of the Gasserian ganglion (GG). STUDY DESIGN: We conducted a randomized prospective study...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28922117/magnetic-resonance-mediated-radiofrequency-ablation
#5
Yik-Kiong Hue, Alexander R Guimaraes, Ouri Cohen, Erez Nevo, Abraham Roth, Jerome L Ackerman, Jerome L Ackerman
OBJECTIVE: To introduce magnetic resonance mediated radiofrequency ablation (MR-RFA), in which the MRI scanner uniquely serves both diagnostic and therapeutic roles. In MR-RFA scanner-induced RF heating is channeled to the ablation site via a Larmor frequency RF pickup device and needle system, and controlled via the pulse sequence. METHODS: MR-RFA was evaluated with simulation of electric and magnetic fields to predict the increase in local specific-absorption-rate (SAR)...
September 18, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28913838/simultaneous-acquisition-of-perfusion-image-and-dynamic-mr-angiography-using-time-encoded-pseudo-continuous-asl
#6
Yuriko Suzuki, Michael Helle, Peter Koken, Marc Van Cauteren, Matthias J P van Osch
PURPOSE: Both dynamic magnetic resonance angiography (4D-MRA) and perfusion imaging can be acquired by using arterial spin labeling (ASL). While 4D-MRA highlights large vessel pathology, such as stenosis or collateral blood flow patterns, perfusion imaging provides information on the microvascular status. Therefore, a complete picture of the cerebral hemodynamic condition could be obtained by combining the two techniques. Here, we propose a novel technique for simultaneous acquisition of 4D-MRA and perfusion imaging using time-encoded pseudo-continuous arterial spin labeling...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28905516/simple-method-for-rf-pulse-measurement-using-gradient-reversal
#7
Vanessa L Landes, Krishna S Nayak
PURPOSE: To develop and evaluate a simple method for measuring the envelope of small-tip radiofrequency (RF) excitation waveforms in MRI, without extra hardware or synchronization. THEORY AND METHODS: Gradient reversal approach to evaluate RF (GRATER) involves RF excitation with a constant gradient and reversal of that gradient during signal reception to acquire the time-reversed version of an RF envelope. An outer-volume suppression prepulse is used optionally to preselect a uniform volume...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28905414/high-spatio-temporal-resolution-in-functional-mri-with-3d-echo-planar-imaging-using-cylindrical-excitation-and-a-caipirinha-undersampling-pattern
#8
Wietske van der Zwaag, Olivier Reynaud, Mayur Narsude, Daniel Gallichan, José P Marques
PURPOSE: The combination of 3D echo planar imaging (3D-EPI) with a 2D-CAIPIRINHA undersampling scheme provides high flexibility in the optimization for spatial or temporal resolution. This flexibility can be increased further with the addition of a cylindrical excitation pulse, which exclusively excites the brain regions of interest. Here, 3D-EPI was combined with a 2D radiofrequency pulse to reduce the brain area from which signal is generated, and hence, allowing either reduction of the field of view or reduction of parallel imaging noise amplification...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28902105/clinical-effectiveness-of-intra-articular-pulsed-radiofrequency-compared-to-intra-articular-corticosteroid-injection-for-management-of-atlanto-occipital-joint-pain-a-prospective-randomized-controlled-pilot-study
#9
So Min Shin, Sang Gyu Kwak, Dong Gyu Lee, Min Cheol Chang
STUDY DESIGN: A prospective randomized controlled pilot study OBJECTIVE.: We aimed to assess the effectiveness of pulsed radiofrequency (PRF) stimulation on the atlanto-occipital (AO) joint in patients with chronic joint pain. Additionally, we compared the effects of AO intra-articular (IA) PRF and AO IA corticosteroid. SUMMARY OF BACKGROUND DATA: IA injection of corticosteroids into the AO joint is widely used for the management of head and upper cervical pain, and its effectiveness has been shown in previous studies...
September 8, 2017: Spine
https://www.readbyqxmd.com/read/28875710/arterial-wall-characteristics-in-patients-with-peripheral-arterial-disease-preliminary-data-obtained-at-different-arterial-sites-by-radiofrequency-based-wall-tracking-system
#10
Fiore Valerio, Pedri Stefano, Kozakova Michaela, Signorelli Salvatore Santo
The common carotid artery (CCA) and the common femoral artery (CFA) have different characteristics. We compared CCA and CFA intima-media thickness (IMT), diameter and stiffness in 50 healthy controls, 50 patients with cardiovascular risk factors (CV-RFs), and 50 patients with peripheral artery diseases (PADs) using radiofrequency-based ultrasound (Rf-US). Common femoral artery-IMT was significantly and similarly increased in patients with both CV-RF and PAD, whereas CCA-IMT was significantly greater only in patients with PAD...
January 1, 2017: Angiology
https://www.readbyqxmd.com/read/28862362/controlling-the-object-phase-for-g-factor-reduction-in-phase-constrained-parallel-mri-using-spatially-selective-rf-pulses
#11
Adam O Kettinger, Stephan A R Kannengiesser, Felix A Breuer, Zoltan Vidnyanszky, Martin Blaimer
PURPOSE: Parallel imaging generally entails a reduction in the signal-to-noise ratio of the final image. Phase-constrained methods aim to improve reconstruction quality by using symmetry properties of k-space. Noise amplification in phase-constrained reconstruction depends heavily on the object background phase. The purpose of this work is to present a new approach of using tailored radiofrequency pulses to optimize the object phase distribution in order to maximize the benefit of phase-constrained reconstruction, and to minimize the noise amplification...
September 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28857466/fractional-ablative-and-nonablative-radiofrequency-for-skin-resurfacing-and-rejuvenation-of-thai-patients
#12
Wilai Thanasarnaksorn, Vorapot Siramangkhalanon, Diane Irvine Duncan, Inna Belenky
BACKGROUND: Fractional radiofrequency (RF) technology is often the preferable skin resurfacing treatment, especially among Asian patients. Second generation fractional RF technology has exclusive capability to produce separate biological responses (ablation, coagulation, or a combination of both) with 3 distinguished penetration depth programs. AIMS: The aim of this study was to evaluate the efficacy and safety of a fractional RF handpiece such as this, on the Thai population...
August 31, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28833407/fully-phase-encoded-mri-near-metallic-implants-using-ultrashort-echo-times-and-broadband-excitation
#13
Curtis N Wiens, Nathan S Artz, Hyungseok Jang, Alan B McMillan, Kevin M Koch, Scott B Reeder
PURPOSE: To develop a fully phase-encoded MRI method for distortion-free imaging near metallic implants, in clinically feasible acquisition times. THEORY AND METHODS: An accelerated 3D fully phase-encoded acquisition with broadband excitation and ultrashort echo times is presented, which uses a broadband radiofrequency pulse to excite the entire off-resonance induced by the metallic implant. Furthermore, fully phase-encoded imaging is used to prevent distortions caused by frequency encoding, and to obtain ultrashort echo times for rapidly decaying signal...
August 21, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28827823/comparison-of-efficacy-of-continuous-epidural-block-and-pulsed-radiofrequency-to-the-dorsal-root-ganglion-for-management-of-pain-persisting-beyond-the-acute-phase-of-herpes-zoster
#14
Eung Don Kim, Young In Lee, Hue Jung Park
BACKGROUND: There is little evidence regarding the effectiveness of intervention methods in the treatment of zoster-related pain (ZAP) after the acute phase of zoster. Generally, if ZAP remains after more than 180 days from its onset, the likelihood of pain reduction is very low; this condition is considered as a "well established" post-herpetic neuralgia (PHN). Although the clinical efficacy of intrathecal steroid injection and spinal cord stimulation (SCS) for ZAP management has been reported, these interventions are not widely used due to inherent disadvantages...
2017: PloS One
https://www.readbyqxmd.com/read/28819609/combined-fluoroscopic-and-arthroscopic-detection-and-removal-of-a-foreign-body-lost-during-elective-shoulder-arthroscopy-a-case-report
#15
Uli Schmiddem, N Hawi, E M Suero, R Meller
INTRODUCTION: We report a case of a lost metal platelet from a radiofrequency ablation probe (VAPR VUE Radiofrequency System, Cool Pulse 90, DePuy, Synthes, Switzerland) in the shoulder joint during elective arthroscopic cuff repair. To the best of our knowledge, this kind of an incident during elective arthroscopy has not been described in the literature so far. In addition, we present an algorithm on how to deal with such an incident. CASE REPORT: A 69-year-old woman underwent an arthroscopic subacromial decompression and rotator cuff repair for a torn supraspinatus tendon...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28811965/adjuvant-immunotherapy-with-autologous-dendritic-cells-for-hepatocellular-carcinoma-randomized-phase-ii-study
#16
Jeong-Hoon Lee, Won Young Tak, Yoon Lee, Min-Kyu Heo, Jae-Sung Song, Hak-Yeop Kim, Soo Young Park, Si Hyun Bae, Joon Hyeok Lee, Jeong Heo, Ki-Hwan Kim, Yong-Soo Bae, Yoon Jun Kim
Our previous phase I/IIA study showed that autologous dendritic cells (DCs) pulsed with tumor-associated antigens are well tolerated in patients with hepatocellular carcinoma (HCC). In this randomized, multicenter, open-label, phase II trial, we investigated the efficacy and safety of this DC-based adjuvant immunotherapy with 156 patients, who treated for HCC with no evidence of residual tumor after standard treatment modalities. Patients were randomly assigned to immunotherapy (n = 77; injection of 3 × 10(7) DC cells, six times over 14 weeks) or control (n = 79; no treatment)...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28807449/non-invasive-intra-cardiac-pressure-measurements-using-subharmonic-aided-pressure-estimation-proof-of-concept-in-humans
#17
Jaydev K Dave, Sushmita V Kulkarni, Purva P Pangaonkar, Maria Stanczak, Maureen E McDonald, Ira S Cohen, Praveen Mehrotra, Michael P Savage, Paul Walinsky, Nicholas J Ruggiero, David L Fischman, David Ogilby, Carolyn VanWhy, Matthew Lombardi, Flemming Forsberg
This study evaluated the feasibility of employing non-invasive intra-cardiac pressure estimation using subharmonic signals from ultrasound contrast agents in humans. This institutional review board-approved proof-of-concept study included 15 consenting patients scheduled for left and right heart catheterization. During the catheterization procedure, Definity was infused intra-venously at 4-10 mL/min. Ultrasound scanning was performed with a Sonix RP using pulse inversion, three incident acoustic output levels and 2...
November 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28806322/reduced-field-of-view-diffusion-weighted-magnetic-resonance-imaging-of-the-prostate-at-3-tesla-comparison-with-standard-echo-planar-imaging-technique-for-image-quality-and-tumor-assessment
#18
Tsutomu Tamada, Justin M Ream, Ankur M Doshi, Samir S Taneja, Andrew B Rosenkrantz
OBJECTIVE: The purpose of this study was to compare image quality and tumor assessment at prostate magnetic resonance imaging (MRI) between reduced field-of-view diffusion-weighted imaging (rFOV-DWI) and standard DWI (st-DWI). METHODS: A total of 49 patients undergoing prostate MRI and MRI/ultrasound fusion-targeted biopsy were included. Examinations included st-DWI (field of view [FOV], 200 × 200 mm) and rFOV-DWI (FOV, 140 × 64 mm) using a 2-dimensional (2D) spatially-selective radiofrequency pulse and parallel transmission...
August 12, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28802550/mr-coagulation-a-novel-minimally-invasive-approach-to-aneurysm-repair
#19
Ouri Cohen, Ming Zhao, Erez Nevo, Jerome L Ackerman
PURPOSE: To demonstrate a proof of concept of magnetic resonance (MR) coagulation, in which MR imaging scanner-induced radiofrequency (RF) heating at the end of an intracatheter long wire heats and coagulates a protein solution to effect a vascular repair by embolization. MATERIALS AND METHODS: MR coagulation was simulated by finite-element modeling of electromagnetic fields and specific absorption rate (SAR) in a phantom. A glass phantom consisting of a spherical cavity joined to the side of a tube was incorporated into a flow system to simulate an aneurysm and flowing blood with velocities of 0-1...
August 9, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28799210/whole-brain-arteriography-and-venography-using-improved-velocity-selective-saturation-pulse-trains
#20
Wenbo Li, Feng Xu, Michael Schär, Jing Liu, Taehoon Shin, Yansong Zhao, Peter C M van Zijl, Bruce A Wasserman, Ye Qiao, Qin Qin
PURPOSE: To develop velocity-selective (VS) MR angiography (MRA) protocols for arteriography and venography with whole-brain coverage. METHODS: Tissue suppression using velocity-selective saturation (VSS) pulse trains is sensitive to radiofrequency field (B1 +) inhomogeneity. To reduce its sensitivity, we replaced the low-flip-angle hard pulses in the VSS pulse train with optimal composite (OCP) pulses. Additionally, new pulse sequences for arteriography and venography were developed by placing spatially selective inversion pulses with a delay to null signals from either venous or arterial blood...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
keyword
keyword
50451
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"