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https://www.readbyqxmd.com/read/27906951/changes-in-neuroglial-activity-in-multiple-spinal-segments-after-caudal-epidural-pulsed-radiofrequency-in-a-rat-model-of-lumbar-disc-herniation
#1
Hee Kyung Cho, Jae Hoon Kang, So-Yeon Kim, Mi-Jung Choi, Se Jin Hwang, Yun-Woo Cho, Sang-Ho Ahn
BACKGROUND: Herniated lumbar discs can induce sciatica by mechanical compression and/or chemical irritation. It was recently reported that neuroglial cellular activity after pulsed radiofrequency (PRF) application to a single dorsal root ganglion (DRG) attenuated neuroglial activity at the corresponding spinal dorsal horn. Recently, caudal epidural PRF has been used to manage neuropathic pain, but evidence of molecular changes after the administration of caudal epidural PRF to attenuate neuropathic pain is lacking, and it has not been determined whether caudal epidural PRF affects neuroglial activity at different spinal levels...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27906949/pulsed-compared-to-thermal-radiofrequency-to-the-medial-calcaneal-nerve-for-management-of-chronic-refractory-plantar-fasciitis-a-prospective-comparative-study
#2
Ayman M Osman, Dina H El-Hammady, Mohamed M Kotb
BACKGROUND: Radiofrequency (RF) treatment is a minimally invasive procedure that has been used for more than 3 decades in treating various chronic pain syndromes. Conventional (continuous) RF treatment occasionally results in worsening or even initiating a new type of pain. The use of pulsed radiofrequency (PRF), which has a non- or minimally neurodestructive neuromodulatory effect, serves as an alternative to conventional RF therapy in many medical situations. OBJECTIVES: To evaluate the effect of applying PRF for 6 minutes vs...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27895872/investigation-of-factors-affecting-body-temperature-changes-during-routine-clinical-head-magnetic-resonance-imaging
#3
Myeong Seong Kim
BACKGROUND: Pulsed radiofrequency (RF) magnetic fields, required to produce magnetic resonance imaging (MRI) signals from tissue during the MRI procedure have been shown to heat tissues. OBJECTIVES: To investigate the relationship between body temperature rise and the RF power deposited during routine clinical MRI procedures, and to determine the correlation between this effect and the body's physiological response. PATIENTS AND METHODS: We investigated 69 patients from the Korean national cancer center to identify the main factors that contribute to an increase in body temperature (external factors and the body's response) during a clinical brain MRI...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27893539/comparative-efficacy-of-radiofrequency-and-pulsed-dye-laser-in-the-treatment-of-rosacea
#4
Sue-Jeong Kim, Young Lee, Young-Joon Seo, Jeung-Hoon Lee, Myung Im
BACKGROUND: Laser and light-based therapies have been used successfully in the treatment of rosacea; however, evidence is lacking regarding the efficacy of radiofrequency (RF). OBJECTIVE: This study evaluated the efficacy of RF in the treatment of rosacea compared with pulsed dye laser (PDL). METHODS: Thirty patients with rosacea (erythematotelangiectatic rosacea [ETR], n = 20; papulopustular rosacea [PPR], n = 10) were enrolled in a randomized, controlled, split-face study...
November 23, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27891636/effects-of-pulsed-radiofrequency-neuromodulation-on-the-rat-with-overactive-bladder
#5
En Jen, Tsung-Hsun Hsieh, Tsung-Che Lu, Meng-Chao Chen, Fu-Jung Lee, Chih-Ting Lin, Shih-Ching Chen, Pei-Yi Chu, Chih-Wei Peng, Chii-Wann Lin
AIM: To quantify the effects of pulsed radiofrequency (PRF) electrical stimulations of the pudendal and pelvic nerves on the bladder function of rats with detrusor overactivity. METHODS: All rats were pretreated with a continuous transvesical infusion of 0.5% acetic acid (AA) for inducing detrusor overactivity. Intravesical pressure was recorded using cysometrography (CMG) during the continuous transvesical infusion to examine the effects of PRF electrical stimulation of the pudendal and pelvic nerves individually...
November 28, 2016: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/27862799/a-hyperpolarizable-1-h-magnetic-resonance-probe-for-signal-detection-15%C3%A2-minutes-after-spin-polarization-storage
#6
Soumya S Roy, Philip Norcott, Peter J Raynern, Gary G R Green, Simon B Duckett
Nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) are two extremely important techniques with applications ranging from molecular structure determination to human imaging. However, in many cases the applicability of NMR and MRI are limited by inherently poor sensitivity and insufficient nuclear spin lifetime. Here we demonstrate a cost-efficient and fast technique that tackles both issues simultaneously. We use the signal amplification by reversible exchange (SABRE) technique to hyperpolarize the target (1) H nuclei and store this polarization in long-lived singlet (LLS) form after suitable radiofrequency (rf) pulses...
November 15, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27858881/efficacy-and-safety-of-continuous-radiofrequency-thermocoagulation-plus-pulsed-radiofrequency-for-treatment-of-v1-trigeminal-neuralgia-a-prospective-cohort-study
#7
Peng Yao, Tao Hong, Yong-Qiang Zhu, Hong-Xi Li, Zhi-Bin Wang, Yuan-Yuan Ding, Jia-Ming Ma, Shi-Nong Pan
Patients may develop serious eye complications after continuous radiofrequency thermocoagulation (CRF) for V1 (ophthalmic division) trigeminal neuralgia (TN) at a higher temperature. Therefore, the temperature of clinical CRF for V1 TN has long been disputed, but there have few reports been found about how to achieve satisfactory pain relief, reduce the incidence rates of complications, and shorten the recovery time after CRF for V1 TN.To observe whether pulsed radiofrequency (PRF) can lead to increased rate in pain relief, reduced rate of complications, or shortened recovery time after CRF is used to treat V1 idiopathic trigeminal neuralgia (ITN)...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27856800/normal-testes-asymmetry-evaluated-by-apparent-diffusion-coefficient-and-magnetization-transfer-ratio
#8
Athina C Tsili, Alexandra Ntorkou, Dimitrios Giannakis, Nikolaos Sofikitis, Maria I Argyropoulou
BACKGROUND: In humans, the left testis generally hangs lower than the right and the right is larger than the left. Magnetic resonance imaging (MRI) represents an important adjuvant modality in the investigation of testicular diseases. PURPOSE: To assess if normal testes asymmetry is related to apparent diffusion coefficient (ADC) and magnetization transfer ratio (MTR). MATERIAL AND METHODS: The normal testes from 106 men were included. Testicular volume (TV) was calculated by using the ellipsoid formula: length × width × height × 0...
November 17, 2016: Acta Radiologica
https://www.readbyqxmd.com/read/27847719/comparison-of-the-effects-of-ultrasound-guided-interfascial-pulsed-radiofrequency-and-ultrasound-guided-interfascial-injection-on-myofascial-pain-syndrome-of-the-gastrocnemius
#9
So Min Park, Yun Woo Cho, Sang Ho Ahn, Dong Gyu Lee, Hee Kyung Cho, Sung Yup Kim
OBJECTIVE: To investigate the comparative treatment effects of ultrasound-guided pulsed radiofrequency treatment (UG-PRF) in the gastrocnemius interfascial space and ultrasound-guided interfascial injection (UG-INJ) on myofascial pain syndrome. METHODS: Forty consecutive patients with myofascial pain syndrome of the gastrocnemius were enrolled and were allocated to one of the two groups. Twenty patients were treated by UG-PRF delivered to the gastrocnemius interfascial space (UG-PRF group) and the other 20 patients were treated by interfascial injection (UG-INJ group)...
October 2016: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27810802/body-diffusion-weighted-imaging-using-non-cpmg-fast-spin-echo
#10
Eric Gibbons, Patrick Le Roux, Shreyas Vasanawala, John Pauly, Adam Kerr
SS-FSE is a fast technique that does not suffer from off-resonance distortions to the degree that EPI does. Unlike EPI, SS-FSE is ill-suited to diffusion weighted imaging (DWI) due to the Carr-Purcell-Meiboom-Geill (CPMG) condition. Non- CPMG phase cycling does accommodate SS-FSE and DWI but places constraints on reconstruction, which are resolved here through parallel imaging. Additionally, improved echo stability can be achieved by using short duration and highly selective DIVERSE radiofrequency pulses. Here, signal-to-noise ratio (SNR) comparisons between EPI and nCPMG SS-FSE acquisitions and reconstruction techniques give similar values...
October 27, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27802611/breakdown-of-linear-response-theory-under-low-power-excitation-in-nmr-i-the-case-of-long-lived-signals-in-inhomogeneously-broadened-spin-systems
#11
Zhaoyuan Gong, Jamie D Walls
In this work, we examine the application of linear response theory to the problem of low-power excitation in inhomogeneously broadened spin systems when the strength of the radiofrequency (RF) pulse, νRF, is smaller than the inhomogeneous linewidth. Even for small overall excitations [Θ = 2πνRFTp ≪ 1 where Tp is the RF pulse length], linear response theory is shown to break down for spins with resonance frequencies that are on the order of νRF, which is due to the fact that the RF interaction cannot be treated as a small perturbation in this case...
October 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27797109/high-efficiency-radiofrequency-power-amplifier-module-for-parallel-transmit-arrays-at-3-tesla
#12
Michael Twieg, Mark A Griswold
PURPOSE: The purpose of this study is to develop an in-bore radiofrequency (RF) power amplifier (RFPA) module with high power efficiency and density for use in parallel transmit (pTX) arrays at 3 Tesla. METHODS: The modules use a combination of current mode class D, class S, and class E amplifiers based on enhancement-mode gallium nitride-on-silicon field-effect transistors. Together the amplifiers implement envelope elimination and restoration to achieve amplitude modulation with high efficiency over a wide operating range...
October 31, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27782599/note-a-dual-chip-stroboscopic-pulsed-radar-for-probing-passive-sensors
#13
F Minary, D Rabus, G Martin, J-M Friedt
Stroboscopy provides an energy and computationally efficient means of sampling radiofrequency and microwave signals assumed to be reproducible under external excitation. While well known for impulse mode RADAR receivers, we here investigate its use for interrogating surface acoustic wave (SAW) transducers acting as passive cooperative targets. Amongst the originality of the implementation is the need to keep phase coherence between successive pulse generations which last up to tens of the radiofrequency periods to optimally transfer energy to the transducer...
September 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27779779/direct-sar-mapping-by-thermoacoustic-imaging-a-feasibility-study
#14
Simone A Winkler, Paul A Picot, Michael M Thornton, Brian K Rutt
PURPOSE: To develop a new method capable of directly measuring specific absorption rate (SAR) deposited in tissue using the thermoacoustic signal induced by short radiofrequency (RF) pulse excitation. THEORY: A detailed model based on the thermoacoustic wave generation and propagation is presented. METHODS: We propose a new concept for direct measurement of SAR, to be used as a safety assessment/monitoring tool for MRI. The concept involves the use of short bursts of RF energy and the measurement of the resulting thermoacoustic excitation pattern by an array of ultrasound transducers, followed by image reconstruction to yield the 3D SAR distribution...
October 25, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27774653/in-vivo-demonstration-of-whole-brain-multislice-multispoke-parallel-transmit-radiofrequency-pulse-design-in-the-small-and-large-flip-angle-regimes-at-7-tesla
#15
Vincent Gras, Alexandre Vignaud, Alexis Amadon, Franck Mauconduit, Denis Le Bihan, Nicolas Boulant
PURPOSE: A multispoke specific absorption rate (SAR) -aware pulse design approach for homogeneous multiple-slice small and large flip angle (FA) excitations with parallel transmission is proposed. The approach aims at optimizing in a slice-specific manner the spokes locations and radiofrequency pulses. METHODS: The problem is posed as a set of slice-specific magnitude-least-squares problems, linked together by hardware and SAR constraints, and solved jointly using an active-set algorithm...
October 23, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27774641/high-resolution-gradient-recalled-echo-imaging-at-9-4t-using-16-channel-parallel-transmit-simultaneous-multislice-spokes-excitations-with-slice-by-slice-flip-angle-homogenization
#16
Desmond H Y Tse, Christopher J Wiggins, Benedikt A Poser
PURPOSE: In order to fully benefit from the improved signal-to-noise and contrast-to-noise ratios at 9.4T, the challenges of B1+ inhomogeneity and the long acquisition time of high-resolution 2D gradient-recalled echo (GRE) imaging were addressed. THEORY AND METHODS: Flip angle homogenized excitations were achieved by parallel transmission (pTx) of 3-spoke pulses, designed by magnitude least-squares optimization in a slice-by-slice fashion; the acquisition time reduction was achieved by simultaneous multislice (SMS) pulses...
October 23, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27770469/toward-imaging-the-body-at-10-5-tesla
#17
M Arcan Ertürk, Xiaoping Wu, Yiğitcan Eryaman, Pierre-François Van de Moortele, Edward J Auerbach, Russell L Lagore, Lance DelaBarre, J Thomas Vaughan, Kâmil Uğurbil, Gregor Adriany, Gregory J Metzger
PURPOSE: To explore the potential of performing body imaging at 10.5 Tesla (T) compared with 7.0T through evaluating the transmit/receive performance of similarly configured dipole antenna arrays. METHODS: Fractionated dipole antenna elements for 10.5T body imaging were designed and evaluated using numerical simulations. Transmit performance of antenna arrays inside the prostate, kidneys and heart were investigated and compared with those at 7.0T using both phase-only radiofrequency (RF) shimming and multi-spoke pulses...
October 21, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27770458/spectrally-selective-three-dimensional-dynamic-balanced-steady-state-free-precession-for-hyperpolarized-c-13-metabolic-imaging-with-spectrally-selective-radiofrequency-pulses
#18
Hong Shang, Subramaniam Sukumar, Cornelius von Morze, Robert A Bok, Irene Marco-Rius, Adam Kerr, Galen D Reed, Eugene Milshteyn, Michael A Ohliger, John Kurhanewicz, Peder E Z Larson, John M Pauly, Daniel B Vigneron
PURPOSE: Balanced steady-state free precession (bSSFP) sequences can provide superior signal-to-noise ratio efficiency for hyperpolarized (HP) carbon-13 ((13) C) magnetic resonance imaging by efficiently utilizing the nonrecoverable magnetization, but managing their spectral response is challenging in the context of metabolic imaging. A new spectrally selective bSSFP sequence was developed for fast imaging of multiple HP (13) C metabolites with high spatiotemporal resolution. THEORY AND METHODS: This novel approach for bSSFP spectral selectivity incorporates optimized short-duration spectrally selective radiofrequency pulses within a bSSFP pulse train and a carefully chosen repetition time to avoid banding artifacts...
October 21, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27770221/one-year-follow-up-results-of-intradiscal-diode-laser-radiofrequency-and-pulsed-radiofrequency-therapies-a-retrospective-study
#19
Korgün Ökmen, Burcu Metin Ökmen
This study aims to investigate the efficacy of three different percutaneous intradiscal therapies in patients with chronic low back pain (CLBP) due to lumbar disc herniation (LDH). Medical files of a total of 120 patients who received percutaneous intradiscal therapy were retrospectively analyzed. All patients were divided into three groups: group L: diode laser (n = 40), group R: radiofrequency (RF) (n = 40), and group P: pulsed radiofrequency (PRF) (n = 40). The visual analogue scale (VAS) and Oswestry Disability Index (ODI) scores were calculated at 1, 3, 6, and 12 months for all patients...
October 21, 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27746559/a-comparative-study-of-continuous-versus-pulsed-radiofrequency-discectomy-for-management-of-low-backache-prospective-randomized-double-blind-study
#20
Bhagya Ranjan Jena, Anil Paswan, Yashpal Singh, Sandeep Loha, Anil Prasad Singh, Virendra Rastogi
BACKGROUND: Radiofrequency (RF) is a minimally invasive target-selective technique that has been used with success for many years in the treatment of different pathologies, such as low back pain, trigeminal neuralgia, and others. AIM: The aim of this study is to compare different mode of RF - continuous RF (CRF) versus pulsed RF (PRF) along with steroid in the management of low back pain of discogenic origin. SETTING AND DESIGN: Prospective, randomized, double-blind trial...
September 2016: Anesthesia, Essays and Researches
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