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Pulse radiofrequency

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https://www.readbyqxmd.com/read/29773567/balanced-steady-state-free-precession-sequence-ciss-fiesta-3d-driven-equilibrium-radiofrequency-reset-pulse-increases-the-diagnostic-yield-for-spinal-drop-metastases-in-children-with-brain-tumors
#1
K Buch, P Caruso, D Ebb, S Rincon
BACKGROUND AND PURPOSE: Identification of spinal drop metastases is important in the staging and management of pediatric patients with primary brain tumors. Our aim was to assess the diagnostic utility of the balanced steady-state free precession (bSSFP) sequence (CISS/FIESTA/3D driven equilibrium radiofrequency reset pulse) for the detection of spinal drop metastases in pediatric patients with primary intracranial tumors. MATERIALS AND METHODS: This was a retrospective study of 44 pediatric patients with primary intracranial tumors undergoing MR imaging spine evaluation for drop metastases before radiation treatment...
May 17, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29759625/post-extrasystolic-potentiation-as-a-predictor-of-recovery-of-left-ventricular-dysfunction-after-radiofrequency-catheter-ablation
#2
Balaji Krishnan, Ashwini Sankar, Inder Anand, Selcuk Adabag, Jian-Ming Li, Edward O McFalls, David G Benditt, Kalyanam Shivkumar, Venkatakrishna N Tholakanahalli
OBJECTIVES: This study hypothesizes that post-extrasystolic potentiation reflects left ventricle contractile reserve and therefore may predict an improvement of premature ventricular contraction (PVC)-induced cardiomyopathy after PVC ablation. BACKGROUND: Post-extrasystolic potentiation is a physiologic phenomenon of blood pressure accentuation after a PVC beat. METHODS: We performed a retrospective study of patients with a PVC burden of ≥10% PVC/24 h and left ventricular ejection fraction (LVEF) of <50% who underwent successful ablation between January 1, 2009, to June 30, 2015...
November 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29757758/ultrasound-guided-pulsed-radiofrequency-in-the-management-of-thoracic-post-herpetic-neuralgia-a-randomized-double-blinded-controlled-trial
#3
Mohamed Y Makharita, Hanaa M El Bendary, Zainab M Sonbul, Salma El Sayed Ahmed, Mahmoud Abdel Latif
OBJECTIVES: This study was designed to evaluate the efficacy and safety of ultrasound-guided pulsed radiofrequency (PRF) for the intercostal nerves (ICNs) in the management of thoracic post-herpetic neuralgia (PHN). METHODS: After 2 weeks of treatment by pregabalin 150▒mg/12 hours, patients were randomly allocated into 2 groups. The PRF group, after ultrasound-guided localization of the ICN of the affected thoracic dermatome, sensory stimulation of the ICN was tested...
May 11, 2018: Clinical Journal of Pain
https://www.readbyqxmd.com/read/29735858/comparison-of-the-analgesic-effects-of-pulse-radiofrequency-and-cryoablation-in-rabbits-with-mental-nerve-neuropathic-pain
#4
D G Canpolat, E Soylu, F Dogruel, N Kütük, F Ugur
Purpose: After mental nerve injury, several sensory disorders may occur. The alterations in sensation may differ from mild paresthesia to complete anesthesia, or neuropathic pain. Neuropathic pain is a difficult clinical condition to manage. The aim of this study was to compare the analgesic effects of pulsed radiofrequency (PRF) and cryoablation in an experimental mental nerve neuropathic pain model in rabbits. Materials and Methods: Fifteen rabbits were divided into three groups...
May 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29721599/optimization-of-magnetization-prepared-rapid-gradient-echo-mp-rage-sequence-for-neonatal-brain-mri
#5
Lili He, Jinghua Wang, Zhong-Lin Lu, Beth M Kline-Fath, Nehal A Parikh
BACKGROUND: Sequence optimization in neonates might improve detection sensitivity of abnormalities for a variety of conditions. However this has been historically challenging because tissue properties such as the longitudinal relaxation time and proton density differ significantly between neonates and adults. OBJECTIVE: To optimize the magnetization-prepared rapid gradient echo (MP-RAGE) sequence to enhance both signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) efficiencies...
May 2, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29707093/pulsed-radiofrequency-as-a-minimally-invasive-treatment-option-in-anterior-cutaneous-nerve-entrapment-syndrome-a-retrospective-analysis-of-26-patients
#6
Robbert C Maatman, Monique A H Steegers, Jan-Willem Kallewaard, Marc R M Scheltinga, Rudi M H Roumen
Background: Chronic abdominal pain is occasionally due to entrapped intercostal nerve endings (ACNES, abdominal cutaneous nerve entrapment syndrome). If abdominal wall infiltration using an anesthetic agent is unsuccessful, a neurectomy may be considered. Pulsed radiofrequency (PRF) is a relatively new treatment option for various chronic pain syndromes. Evidence regarding a beneficial effect of this minimally invasive technique in ACNES is lacking. The aim was to assess the effectiveness of PRF treatment in ACNES patients...
June 2018: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/29672916/magic-angle-spinning-nmr-with-metallized-rotors-as-cylindrical-microwave-resonators
#7
Faith J Scott, Erika L Sesti, Eric J Choi, Alexander J Laut, Jagadishwar R Sirigiri, Alexander B Barnes
We introduce a novel design for millimeter wave electromagnetic structures within magic angle spinning (MAS) rotors. In this demonstration, a copper coating is vacuum deposited onto the outside surface of a sapphire rotor at a thickness of 50 nanometers. This thickness is sufficient to reflect 197 GHz microwaves, yet not too thick as to interfere with radiofrequency fields at 300 MHz or prevent sample spinning due to eddy currents. Electromagnetic simulations of an idealized rotor geometry show a microwave quality factor of 148...
April 19, 2018: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/29668635/effect-of-intradiscal-pulsed-radiofrequency-on-refractory-chronic-discogenic-neck-pain-a-case-report
#8
So Young Kwak, Min Cheol Chang
RATIONALE: Despite medication, exercise, and medical intervention, many patients complain of persistent discogenic neck pain. To manage discogenic neck pain, we performed intradiscal pulsed radiofrequency (PRF) stimulation in a patient with chronic discogenic neck pain refractory to oral medication and epidural steroid injection. PATIENT CONCERNS: A 26-year-old man presented with a numeric rating scale (NRS) score of 7 for chronic neck pain. His pain was worse when the neck was held in one position for a prolonged period...
April 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29628832/efficacy-and-safety-of-pulsed-radiofrequency-and-steroid-injection-for-intercostobrachial-neuralgia-in-postmastectomy-pain-syndrome-a-clinical-trial
#9
Beshoy Nabil Fam, Ghada Gamal El-Din El-Sayed, Raafat Mahfouz Reyad, Ikramy Mansour
Background: Breast cancer is a common neoplastic tumor in women, and the postmastectomy pain syndrome has been reported frequently after surgical treatment. The injury of the intercostobrachial nerve is considered the major cause of this type of pain. Purpose: Evaluation of efficacy and safety of pulsed radiofrequency (PRF) and steroid injection on the 2nd and 3rd thoracic (T2 and T3) dorsal root ganglions (DRGs) for intercostobrachial neuralgia (ICBN) postmastectomy...
April 2018: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/29611197/dceus-based-multi-parametric-perfusion-imaging-using-pulse-inversion-bubblet-decorrelation
#10
Diya Wang, Zhe Su, Yu Zhang, Xiaoyan Zhao, Supin Wang, Mingxi Wan
PURPOSE: This study aimed to clarify the influences of composite dynamic contrast-enhanced ultrasound (DCEUS) on multi-parametric perfusion imaging (PPI) and to develop a novel PPI scheme through pulse-inversion Bubblet decorrelation (PIBD) to improve its contrast and detailed discriminability. METHOD: In in vivo perfusion experiments on rabbit kidneys, a pair of phase-inverted 'Bubblets' was constructed. Phase-inverted raw radiofrequency echoes were reconstructed by using the maximum coefficients obtained from Bubblet decorrelation analysis and summed to form DCEUS loops...
April 2, 2018: Medical Physics
https://www.readbyqxmd.com/read/29607551/high-peak-and-high-average-radiofrequency-power-transmit-receive-switch-for-thermal-magnetic-resonance
#11
Yiyi Ji, Werner Hoffmann, Michal Pham, Alexander E Dunn, Haopeng Han, Celal Özerdem, Helmar Waiczies, Michael Rohloff, Beate Endemann, Cyrille Boyer, May Lim, Thoralf Niendorf, Lukas Winter
PURPOSE: To study the role of temperature in biological systems, diagnostic contrasts and thermal therapies, RF pulses for MR spin excitation can be deliberately used to apply a thermal stimulus. This application requires dedicated transmit/receive (Tx/Rx) switches that support high peak powers for MRI and high average powers for RF heating. To meet this goal, we propose a high-performance Tx/Rx switch based on positive-intrinsic-negative diodes and quarter-wavelength (λ/4) stubs. METHODS: The λ/4 stubs in the proposed Tx/Rx switch design route the transmitted RF signal directly to the RF coil/antenna without passing through any electronic components (e...
April 1, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29603381/high-resolution-whole-brain-diffusion-mri-at-7t-using-radiofrequency-parallel-transmission
#12
Xiaoping Wu, Edward J Auerbach, An T Vu, Steen Moeller, Christophe Lenglet, Sebastian Schmitter, Pierre-François Van de Moortele, Essa Yacoub, Kâmil Uğurbil
PURPOSE: Investigating the utility of RF parallel transmission (pTx) for Human Connectome Project (HCP)-style whole-brain diffusion MRI (dMRI) data at 7 Tesla (7T). METHODS: Healthy subjects were scanned in pTx and single-transmit (1Tx) modes. Multiband (MB), single-spoke pTx pulses were designed to image sagittal slices. HCP-style dMRI data (i.e., 1.05-mm resolutions, MB2, b-values = 1000/2000 s/mm2 , 286 images and 40-min scan) and data with higher accelerations (MB3 and MB4) were acquired with pTx...
March 30, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29594090/assessing-exposures-to-magnetic-resonance-imaging-s-complex-mixture-of-magnetic-fields-for-in-vivo-in-vitro-and-epidemiologic-studies-of-health-effects-for-staff-and-patients
#13
Jennifer Frankel, Jonna Wilén, Kjell Hansson Mild
A complex mixture of electromagnetic fields is used in magnetic resonance imaging (MRI): static, low-frequency, and radio frequency magnetic fields. Commonly, the static magnetic field ranges from one to three Tesla. The low-frequency field can reach several millitesla and with a time derivative of the order of some Tesla per second. The radiofrequency (RF) field has a magnitude in the microtesla range giving rise to specific absorption rate values of a few Watts per kilogram. Very little attention has been paid to the case where there is a combined exposure to several different fields at the same time...
2018: Frontiers in Public Health
https://www.readbyqxmd.com/read/29574259/dorsal-root-ganglia-pulsed-radiofrequency-treatment-alters-the-spinal-immune-environment
#14
Yawar J Qadri, Ru-Rong Ji
No abstract text is available yet for this article.
March 21, 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29573140/quantitative-analysis-of-image-quality-for-acceptance-and-commissioning-of-an-mri-simulator-with-a-semiautomatic-method
#15
Xinyuan Chen, Jianrong Dai
Magnetic Resonance Imaging (MRI) simulation differs from diagnostic MRI in purpose, technical requirements, and implementation. We propose a semiautomatic method for image acceptance and commissioning for the scanner, the radiofrequency (RF) coils, and pulse sequences for an MRI simulator. The ACR MRI accreditation large phantom was used for image quality analysis with seven parameters. Standard ACR sequences with a split head coil were adopted to examine the scanner's basic performance. The performance of simulation RF coils were measured and compared using the standard sequence with different clinical diagnostic coils...
March 24, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29565952/the-effect-of-bipolar-pulsed-radiofrequency-treatment-on-chronic-lumbosacral-radicular-pain-refractory-to-monopolar-pulsed-radiofrequency-treatment
#16
Dong Gyu Lee, Yun Woo Cho, Sang Ho Ahn, Min Cheol Chang
BACKGROUND: Patients with lumbosacral radicular pain may complain of persisting pain after monopolar pulsed radiofrequency (PRF) treatment. OBJECTIVE: We evaluated the effect of bipolar PRF stimulation of the dorsal root ganglion (DRG) in patients with chronic lumbosacral radicular pain who were unresponsive to both monopolar PRF stimulation of the DRG and transforaminal epidural steroid injection (TFESI). STUDY DESIGN: This is a prospective observational study...
March 2018: Pain Physician
https://www.readbyqxmd.com/read/29565950/pulsed-radiofrequency-treatment-for-chronic-post-surgical-orchialgia-a-double-blind-sham-controlled-randomized-trial-three-month-results
#17
Diab Fuad Hetta, Ali Mohammed Mahran, Emad Eldien Kamal
BACKGROUND: Chronic post-surgical pain in the groin region represents a challenge for the managing physician and is a burden on the quality of life of the patient. None of the existing interventions or medical treatment is satisfactory. OBJECTIVES: We aim to evaluate the analgesic efficacy of pulsed radiofrequency (PRF) applied to the ilioinguinal nerve and the genital branch of the genitofemoral nerve for patients suffering from chronic post-surgical orchialgia...
March 2018: Pain Physician
https://www.readbyqxmd.com/read/29565949/evaluation-of-the-effect-of-duration-on-the-efficacy-of-pulsed-radiofrequency-in-an-animal-model-of-neuropathic-pain
#18
Eiad A Ramzy, Khaled I Khalil, Eman M Nour, Mohammed F Hamed, Mohamed A Taha
BACKGROUND: Pulsed radiofrequency (PRF) is increasingly used in clinical practice, especially in neuropathic pain disorders. Although PRF is not new to clinical use, there are significant gaps in knowledge regarding its effectiveness. OBJECTIVES: The current study was conducted to evaluate the effect of duration of application of PRF on its analgesic efficacy in improvement of neuropathic pain. STUDY DESIGN: A randomized experimental trial...
March 2018: Pain Physician
https://www.readbyqxmd.com/read/29562396/-the-efficacy-of-ultrasound-guided-spinal-nerve-posterior-ramus-pulsed-radiofrequency-treatment-for-aged-lower-back-post-herpetic-neuralgia
#19
Z B Pi, J K Zhang, Y Peng, Y Jin, H Lin
Objective: To evaluate the efficacy of ultrasound-guided spinal nerve posterior ramus pulsed radiofrequency treatment of lower back post-herpetic neuralgia. Methods: One hundred and twenty-eight cases of lower back or anterior abdominal wall acute post-herpetic neuralgia patients were enrolled. They were randomly divided into two groups. Group A: oral treatment only with gabapentin+ celecoxib+ amitriptyline. Group B: while taking these drugs, patients were treated with radiofrequency pulses using a portable ultrasound device and the paravertebral puncture technique...
March 13, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29559877/pulsed-radiofrequency-ablation-for-treating-sural-neuralgia
#20
Alaa Abd-Elsayed, Markus Jackson, Elizabeth Plovanich
Background: Sural neuralgia is persistent pain in the distribution of the sural nerve that provides sensation to the lateral posterior corner of the leg, lateral foot, and fifth toe. Sural neuralgia is a rare condition but can be challenging to treat and can cause significant limitation. We present 2 cases of sural neuralgia resistant to conservative management that were effectively treated by pulsed radiofrequency ablation. Case Reports: A 65-year-old female developed sural neuralgia after a foot surgery and failed conservative management...
2018: Ochsner Journal
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