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https://www.readbyqxmd.com/read/27914448/a-fractional-calculus-model-of-anomalous-dispersion-of-acoustic-waves
#1
Andrew W Wharmby
An empirical formula based on viscoelastic analysis techniques that employs concepts from the fractional calculus that was used to model the dielectric behavior of materials exposed to oscillating electromagnetic fields in the radiofrequency, terahertz, and infrared bands. This work adapts and applies the formula to model viscoelastic behavior of materials that show an apparent increase of phase velocity of vibration with an increase in frequency, otherwise known as anomalous dispersion. A fractional order wave equation is derived through the application of the classic elastic-viscoelastic correspondence principle whose analytical solution is used to describe absorption and dispersion of acoustic waves in the viscoelastic material displaying anomalous dispersion in a specific frequency range...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27911950/a-specialized-multi-transmit-head-coil-for-high-resolution-fmri-of-the-human-visual-cortex-at-7t
#2
Shubharthi Sengupta, Alard Roebroeck, Valentin G Kemper, Benedikt A Poser, Jan Zimmermann, Rainer Goebel, Gregor Adriany
PURPOSE: To design, construct and validate radiofrequency (RF) transmit and receive phased array coils for high-resolution visual cortex imaging at 7 Tesla. METHODS: A 4 channel transmit and 16 channel receive array was constructed on a conformal polycarbonate former. Transmit field efficiency and homogeneity were simulated and validated, along with the Specific Absorption Rate, using [Formula: see text] mapping techniques and electromagnetic simulations. Receiver signal-to-noise ratio (SNR), temporal SNR (tSNR) across EPI time series, g-factors for accelerated imaging and noise correlations were evaluated and compared with a commercial 32 channel whole head coil...
2016: PloS One
https://www.readbyqxmd.com/read/27911227/radiofrequency-ablation-of-spinal-osteoid-osteoma-a-prospective-study
#3
Joe Faddoul, Yara Faddoul, Sandra Kobaiter-Maarrawi, Ronald Moussa, Tony Rizk, Georges Nohra, Nabil Okais, Elie Samaha, Joseph Maarrawi
OBJECTIVE Surgery has been considered the standard treatment for spinal osteoid osteomas that are refractory to analgesic agents. Radiofrequency ablation (RFA) is a less invasive technique with established efficiency for the treatment of peripheral osteoid osteomas. The main objectives of this study are to evaluate the safety of RFA based on the results of a previous experimental study in rats conducted in the authors' laboratory and to identify its short- and long-term efficiency in the treatment of spinal osteoid osteomas...
December 2, 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/27911134/split-face-histological-and-biochemical-evaluation-of-tightening-efficacy-using-temperature-and-impedance-controlled-continuous-non-invasive-radiofrequency-energy
#4
Sylvie Boisnic, Marc Divaris, Marie-Christine Branchet, Andrew Anthony Nelson
BACKGROUND: Bi-polar radiofrequency (RF) is capable of heating dermal collagen fibers and inducing skin tightening by collagen remodelling. OBJECTIVE: To substantiate safety and improvement of skin laxity following skin heating with a novel temperature and impedance controlled non-invasive radiofrequency (RF) device by histological and biochemical evaluations. METHODS: A split-face study was performed on 4 subjects that underwent 8 weekly RF sessions on one side of their face, leaving the other side an untreated control and then underwent face-lift procedure...
December 2, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27910259/safety-efficacy-and-usage-compliance-of-home-use-device-utilizing-rf-and-light-energies-for-treating-periorbital-wrinkles
#5
Michael H Gold, Julie Biron, Liora Levi, Whitney Sensing
BACKGROUND: The aging process is often associated with undesirable effects on facial skin such as skin redundancy, reduction of elasticity, and increased wrinkling. Radiofrequency (RF) and light-emitting diodes (LEDs) are widely used, clinically proven technologies for skin rejuvenation. STUDY OBJECTIVE: This study aimed to evaluate the safety, efficacy, and usage compliance of the home-use device, utilizing RF and LED energies, for self-treatment of periorbital wrinkles and improvement of skin appearance...
December 2, 2016: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/27910248/use-of-heart-rate-variability-and-photoplethysmograph-derived-parameters-as-assessment-signals-of-radiofrequency-therapy-efficacy-for-chronic-pain
#6
Jing-Jhao Ye, Chiung-Cheng Chuang, Yu-Ting Tai, Kuan-Ting Lee, Kuo-Sheng Hung
BACKGROUND: Radiofrequency therapy (RFT) generates molecular motion, and produces heat and electromagnetic effects on tissues, which attenuate pain sensation and thereby relieve pain. This study was to observe the altering trend of physiological parameters after RFT for chronic cervical or lumbar pain. METHODS: This study recruited 66 patients with chronic cervical or lumbar pain, and recorded their physiological parameters before and after RFT by using heart rate variability (HRV) and photoplethysmography (PPG) to explore the feasibility of RFT efficacy assessment...
December 2, 2016: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/27910083/radiofrequency-catheter-ablation-of-accessory-pathways-in-patients-with-ebstein-s-anomaly-at-8-years-of-follow-up
#7
Michał Orczykowski, Paweł Derejko, Robert Bodalski, Piotr Urbanek, Joanna Zakrzewska-Koperska, Radosław Sierpiński, Katarzyna Kalin, Andrzej Hasiec, Grzegorz Warmiński, Maria Miszczak-Knecht, Katarzyna Bieganowska, Rafał Baranowski, Maria Bilińska, Elżbieta Biernacka, Piotr Hoffman, Łukasz Szumowski
BACKGROUND: Data regarding long-term follow-up of radiofrequency catheter ablation (RFCA) of accessory pathways (APs) in patients with Ebstein's anomaly (EA) are limited. The procedures are challenging due to multiple or wide APs. METHODS: Analysis was performed on clinical and periprocedural data of patients with EA referred to the centre in order to perform catheter ablation of accessory pathway (AP). The group consisted of 22 patients (female 40.9%, mean age 33...
December 2, 2016: Cardiology Journal
https://www.readbyqxmd.com/read/27909522/safety-and-necessity-of-thermal-esophageal-probes-during-radiofrequency-ablation-for-the-treatment-of-atrial-fibrillation
#8
Antonio Fasano, Prof Emeritus, Luca Anfuso Md, Stefano Bozzi Md, Claudio Pandozi Prof
BACKGROUND: Radiofrequency ablation is extensively used to achieve pulmonary veins isolation for the cure of atrial fibrillation. Luminal esophageal temperature can be monitored by means of suitable probes to prevent the onset of lesions. OBJECTIVE: To compute the thermal field generated by the ablation, to investigate the interaction between the electromagnetic field and the probe sensors, and to provide a safe interpretation of the temperature detected by the probe, supported by clinical data...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909510/interactive-in-vitro-training-in-physics-of-radiofrequency-ablation-for-physicians-and-medical-engineering-students
#9
REVIEW
Haber T, Kleister G, Selman B, Härtig J, Melichercik J, Ismer B
Radiofrequency (RF) ablation requires a complex set of devices as well as profound electrophysiological experience and substantial knowledge of physical science basics. To establish RF ablation in-vitro teaching-system, six workstations were equipped with computer-controlled RF ablation generators. Universal connection boxes allow ablation-essays with catheters of different make and model. Special wetlabs were developed combining a basin containing isotonic saline solution with a thermostat and a pump to simulate blood flow...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909480/a-case-of-wide-complex-tachycardia-in-a-patient-with-a-biventricular-assist-device
#10
Abrams Mark P, Whang William, Iyer Vivek, Garan Hasan, Biviano Angelo
This case report highlights the variety of wide complex tachycardias, and the need for their prompt management, in the growing population of patients with circulatory support devices. We present a case that demonstrates how a wide complex supraventricular tachycardia in a patient with a biventricular assist device can be safely and effectively targeted for treatment using percutaneous radiofrequency catheter ablation, allowing for clinical improvement, weaning of RVAD treatment, and discharge home with LVAD alone...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909471/contact-force-and-atrial-fibrillation-ablation
#11
REVIEW
Ullah W, Schilling Rj, Wong T
Catheters able to measure the force and vector of contact between the catheter tip and myocardium are now available. Pre-clinical work has established that the degree of contact between the radiofrequency ablation catheter and myocardium correlates with the size of the delivered lesion. Excess contact is associated with steam pops and perforation. Catheter contact varies within the left atrium secondary to factors including respiration, location, atrial rhythm and the trans-septal catheter delivery technology used...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27908546/effects-of-branched-chain-amino-acid-supplementation-after-radiofrequency-ablation-for-hepatocellular-carcinoma-a-randomized-trial
#12
Shunsuke Nojiri, Kei Fujiwara, Noboru Shinkai, Etsuko Iio, Takashi Joh
OBJECTIVE: Maintenance of liver function is important for better outcomes after radiofrequency ablation (RFA) for hepatocellular carcinoma (HCC). The aim of this study was to examine the effects of oral branched-chain amino acid (BCAA) supplementation on liver function, intrahepatic recurrence rate, and incidence of complications after RFA for HCC. METHODS: Patients with cirrhosis who underwent RFA were enrolled between August 2009 and April 2012, randomized to oral supplementation with Aminoleban EN (BCAA group) or diet alone (control group), and followed to determine changes in serum parameters and health status...
January 2017: Nutrition
https://www.readbyqxmd.com/read/27908167/computer-aided-prognosis-for-cell-death-categorization-and-prediction-in-vivo-using-quantitative-ultrasound-and-machine-learning-techniques
#13
M J Gangeh, A Hashim, A Giles, L Sannachi, G J Czarnota
PURPOSE: At present, a one-size-fits-all approach is typically used for cancer therapy in patients. This is mainly because there is no current imaging-based clinical standard for the early assessment and monitoring of cancer treatment response. Here, the authors have developed, for the first time, a complete computer-aided-prognosis (CAP) system based on multiparametric quantitative ultrasound (QUS) spectroscopy methods in association with texture descriptors and advanced machine learning techniques...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907904/a-new-cryoenergy-for-ventricular-tachycardia-ablation-a-proof-of-concept-study
#14
Benjamin Berte, Frédéric Sacher, Jean-Yves Wielandts, Saagar Mahida, Xavier Pillois, Rukshen Weerasooriya, Olivier Bernus, Pierre Jaïs
INTRODUCTION: Lack of transmural lesion formation during radiofrequency (RF) ablation for ventricular tachycardia (VT) is an important determinant of arrhythmia recurrence. The aim of this proof-of-concept study was to evaluate safety and efficacy of a new and more powerful cryoablation system for ventricular ablation. METHODS AND RESULTS: Five healthy female sheep (59 ± 6 kg) underwent a surgical sternotomy for epicardial and endocardial access [endocardial access via right atrial appendage and left ventricular (LV) apex]...
October 25, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
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
#15
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
#16
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/27906939/a-new-radiofrequency-ablation-procedure-to-treat-sacroiliac-joint-pain
#17
Jianguo Cheng, See Loong Chen, Nicole Zimmerman, Jarrod E Dalton, Garret LaSalle, Richard Rosenquist
BACKGROUND: Low back pain may arise from disorders of the sacroiliac joint in up to 30% of patients. Radiofrequency ablation (RFA) of the nerves innervating the sacroiliac joint has been shown to be a safe and efficacious strategy. OBJECTIVES: We aimed to develop a new RFA technique to relieve low back pain secondary to sacroiliac joint disorders. STUDY DESIGN: Methodology development with validation through prospective observational non-randomized trial (PONRT)...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27905145/the-public-multi-coil-information-pumcin-policy
#18
Christoph Juchem, Robin A de Graaf
PURPOSE: Multi-coil (MC) magnetic field modeling has emerged as a viable alternative to conventional field generation based on spherical harmonic shapes, and an active MC community is forming. Although all MC applications share the same modeling concept, the specific MC designs can largely differ as a result of disparities in region of interest (eg, human versus rodent), intended MR application (eg, B0 shimming versus spatial encoding), or other experimental constraints (eg, available bore space or integration with radiofrequency technology)...
December 1, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27905049/radiofrequency-ablation-vs-microwave-ablation-for-patients-with-benign-thyroid-nodules-a-propensity-score-matching-study
#19
Wen-Wen Yue, Shu-Rong Wang, Feng Lu, Li-Ping Sun, Le-Hang Guo, Yong-Lin Zhang, Xiao-Long Li, Hui-Xiong Xu
PURPOSE: To compare the efficacy and the safety of radiofrequency ablation and microwave ablation for treatment of benign thyroid nodules using a propensity score matching study design. METHODS: Two hundred and sixty patients with benign thyroid nodules were studied retrospectively, including 102 patients treated with radiofrequency ablation and 158 treated with microwave ablation. To reduce confounding bias due to retrospective assignment, propensity score matching was performed to balance the preablation data of the two groups...
November 30, 2016: Endocrine
https://www.readbyqxmd.com/read/27904861/a-recent-advance-in-image-guided-locoregional-therapy-for-hepatocellular-carcinoma
#20
REVIEW
Yaoping Shi, Bo Zhai
BACKGROUND: Hepatocellular carcinoma (HCC) is the fifth most common cancer worldwide and the third most common cause of cancer-related deaths. Hepatic resection and liver transplantation are considered to be the preferred treatment for HCC. However, as novel therapeutic options such as image-guided locoregional therapies have emerged and been refined, the manner in which HCC is treated has changed dramatically compared with what it was considered just 2 decades earlier. SUMMARY: This study reviews the current results of various image-guided locoregional therapies for treating HCC, especially focusing on thermal ablative and transarterial techniques...
October 2016: Gastrointestinal Tumors
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