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https://www.readbyqxmd.com/read/28419591/application-of-spin-echoes-in-the-regime-of-weak-dephasing-to-t1-mapping-of-the-lung
#1
Jakob Assländer, Steffen J Glaser, Jürgen Hennig
PURPOSE: This work presents an approach to mapping the entire lung's proton density and T1 within a single breath-hold and analyzes the apparent T1 when exciting with a spin echo generating pulse in comparison to a standard gradient echo acquisition. METHODS: An inversion-recovery SNAPSHOT-FLASH sequence with a stack-of-stars k-space readout with a golden angle increment was modified to use a spin echo generating radiofrequency-pulse for excitation. Data of five volunteers were acquired on a 3T scanner and image reconstruction was performed by an iterative algorithm adopted from MR-Fingerprinting...
April 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28403104/effect-of-bipolar-pulsed-radiofrequency-on-refractory-chronic-cervical-radicular-pain-a-report-of-two-cases
#2
Min Cheol Chang
RATIONALE: Despite undergoing transforaminal epidural steroid injection (TFESI), many patients complain of persisting cervical radicular pain. For the management of chronic cervical radicular pain, clinicians are widely applying pulsed radiofrequency (PRF) stimulation to dorsal root ganglions (DRGs). To enhance the effect of PRF stimulation, we conducted bipolar PRF stimulation in 2 patients with chronic cervical radicular pain that was refractory to monopolar PRF and repeated TFESIs...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28396759/interventional-treatment-for-neuropathic-pain-due-to-combined-cervical-radiculopathy-and-carpal-tunnel-syndrome-a-case-report
#3
Simone Vigneri, Gianfranco Sindaco, Matteo Zanella, Elisabetta Sette, Valeria Tugnoli, Gilberto Pari
The coexistence of median and cervical nerve root damage might hide a complex pathophysiology. Here, we describe and discuss the case of a patient suffering from numbness and painful tingling of the hand, whose symptoms were effectively treated with pulsed radiofrequency and epidural administration of bupivacaine and morphine.
April 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28390002/a-tool-for-validating-mri-guided-strategies-a-digital-breathing-ct-mri-phantom-of-the-abdominal-site
#4
Chiara Paganelli, Paul Summers, Chiara Gianoli, Massimo Bellomi, Guido Baroni, Marco Riboldi
Dynamic magnetic resonance imaging (MRI) is emerging as the elected image modality for organ motion quantification and management in image-guided radiotherapy. However, the lack of validation tools is an open issue for image guidance in the abdominal and thoracic organs affected by organ motion due to respiration. We therefore present an abdominal four-dimensional (4D) CT/MRI digital phantom, including the estimation of MR tissue parameters, simulation of dedicated abdominal MR sequences, modeling of radiofrequency coil response and noise, followed by k-space sampling and image reconstruction...
April 8, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28373880/effects-of-multipolar-radiofrequency-and-pulsed-electromagnetic-field-treatment-for-face-and-neck-rejuvenation
#5
Thais Cristina Ferraz de Oliveira, Sheyla de Fatima Soares Rocha, Daniel Gontijo Ramos, Camila Gontijo Ramos, Michelle Vanessa Dos Anjos Carvalho, Mariana Gontijo Ramos
Skin aging is a gradual process that leads to wrinkle formation, laxity, and overall changes in skin appearance. In recent years, the demands to noninvasive treatments for facial rejuvenation increased, along with a variety of technologies and devices, such as radiofrequency. The present study aimed to evaluate the clinical effects of a multipolar radiofrequency and pulsed electromagnetic field treatment for face and neck rejuvenation. Eleven patients with mild to moderate grades of photoaging underwent eight radiofrequency and pulsed electromagnetic field treatment sessions, once a week...
2017: Dermatology Research and Practice
https://www.readbyqxmd.com/read/28367261/long-term-nasal-and-peri-oral-tightening-by-a-single-fractional-noninsulated-microneedle-radiofrequency-treatment
#6
Yohei Tanaka
Background: The skin tightening effects induced by non-insulated microneedle radiofrequency have proved long-lasting. Our previous three-dimensional volumetric assessment showed significant facial tightening for up to six months. However, nasal and peri-oral tightening effects lasted longer. The objective of this study was to investigate the distribution of the long-term volumetric reduction in facial area induced by a single fractional non-insulated microneedle radiofrequency treatment. Methods: Fifteen Asian patients underwent full facial skin tightening using a sharply tapered non-insulated microneedle radiofrequency applicator with a novel fractionated pulse mode...
February 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28357404/painvision%C3%A2-apparatus-for-assessment-of-efficacy-of-pulsed-radiofrequency-combined-with-pharmacological-therapy-in-the-treatment-of-postherpetic-neuralgia-and-correlations-with-measurements
#7
RANDOMIZED CONTROLLED TRIAL
Dong Wang, Kai Zhang, ShaoLong Han, LingZhi Yu
Objective. PainVision device was a developed application for the evaluation of pain intensity. The objective was to assess the efficacy and safety of pulsed radiofrequency (PRF) combined with pharmacological therapy in the treatment of postherpetic neuralgia (PHN). We also discussed the correlation of the measurements. Method. Forty patients with PHN were randomized for treatment with PRF combined with pharmacological therapy (PRF group, n = 20) or pharmacological therapy (control group, n = 20) at postoperative 48 hours...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28353611/comparison-of-intra-articular-lumbar-facet-joint-pulsed-radiofrequency-and-intra-articular-lumbar-facet-joint-corticosteroid-injection-for-management-of-lumbar-facet-joint-pain-a-randomized-controlled-trial
#8
RANDOMIZED CONTROLLED TRIAL
Kyung Hee Do, Sang Ho Ahn, Yun Woo Cho, Min Cheol Chang
BACKGROUND: This study aimed to demonstrate the effect of intra-articular (IA) lumbar facet joint (LFJ) pulsed radiofrequency (PRF) for the management of LFJ pain, and to compare the effect of IA LFJ PRF to IA corticosteroid injection (ICI). Pathology in the LFJ is a common source of lower back pain (LBP). It is responsible for chronic LBP in approximately 15% to 45% of patients. It has been reported that PRF stimulation can effectively reduce refractory joint pain. METHODS: Sixty patients with LFJ pain were recruited and randomly assigned to 1 of 2 groups: the IA PRF group and the ICI group...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28339446/pulsed-radiofrequency-ablation-of-pudendal-nerve-for-treatment-of-a-case-of-refractory-pelvic-pain
#9
Vadim Petrov-Kondratov, Avneesh Chhabra, Stephanie Jones
Pudendal neuralgia (PN) is a result of pudendal nerve entrapment or injury, also called "Alcock syndrome." Pain that develops is often chronic, and at times debilitating. If conservative measures fail, invasive treatment modalities can be considered. The goal of this case report is to add to a small body of literature that a pulsed radiofrequency (PRF) ablation can be effectively used to treat PN and to show that high resolution MR neurography imaging can be used to detect pudendal neuropathy. CASE PRESENTATION: We present a case of a 51-year-old woman with 5 years of worsening right groin and vulva pain...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28339440/pulsed-radiofrequency-to-the-dorsal-root-ganglion-in-acute-herpes-zoster-and-postherpetic-neuralgia
#10
Koohyun Kim, Daehyun Jo, EungDon Kim
BACKGROUND: Latent varicella zoster virus reactivates mainly in sensory ganglia such as the dorsal root ganglion (DRG) or trigeminal ganglion. The DRG contains many receptor channels and is an important region for pain signal transduction. Sustained abnormal electrical activity to the spinal cord via the DRG in acute herpes zoster can result in neuropathic conditions such as postherpetic neuralgia (PHN). Although the efficacy of pulsed radiofrequency (PRF) application to the DRG in various pain conditions has been previously reported, the application of PRF to the DRG in patients with herpes zoster has not yet been studied...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28339432/bipolar-versus-unipolar-intraarticular-pulsed-radiofrequency-thermocoagulation-in-chronic-knee-pain-treatment-a-prospective-randomized-trial
#11
Ersel Gulec, Hayri Ozbek, Sinan Pektas, Geylan Isik
BACKGROUND: Chronic knee pain is a major widespread problem causing significant impairment of daily function. Pulsed radiofrequency has been shown to reduce severe chronic joint pain as a non-pharmacological and less invasive treatment method. OBJECTIVE: We aimed to compare the effectiveness of unipolar and bipolar intraarticular pulsed radiofrequency methods in chronic knee pain control. STUDY DESIGN: Prospective, randomized, double-blind study...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28339430/comparative-effectiveness-review-of-cooled-versus-pulsed-radiofrequency-ablation-for-the-treatment-of-knee-osteoarthritis-a-systematic-review
#12
Anita Gupta, Daniel P Huettner, Matthew Dukewich
BACKGROUND: Patients suffering from osteoarthritis of the knee and patients post total knee arthroplasty often develop refractory, disabling chronic knee pain. Radiofrequency ablation, including conventional, pulsed, and cooled, has recently become more accepted as an interventional technique to manage chronic knee pain in patients who have failed conservative treatment or who are not suitable candidates for surgical treatment. OBJECTIVE: This systematic review aimed to analyze published studies on radiofrequency ablation to provide an overview of the current knowledge regarding variations in procedures, nerve targets, adverse events, and temporal extent of clinical benefit...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28336426/sar-simulations-safety
#13
Thomas M Fiedler, Mark E Ladd, Andreas K Bitz
At ultra-high fields, the assessment of radiofrequency (RF) safety presents several new challenges compared to low-field systems. Multi-channel RF transmit coils in combination with parallel transmit techniques produce time-dependent and spatially varying power loss densities in the tissue. Further, in ultra-high-field systems, localized field effects can be more pronounced due to a transition from the quasistationary to the electromagnetic field regime. Consequently, local information on the RF field is required for reliable RF safety assessment as well as for monitoring of RF exposure during MR examinations...
March 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28330349/coherent-manipulation-of-non-thermal-spin-order-in-optical-nuclear-polarization-experiments
#14
Gerd Buntkowsky, Konstantin L Ivanov, Herbert Zimmermann, Hans-Martin Vieth
Time resolved measurements of Optical Nuclear Polarization (ONP) have been performed on hyperpolarized triplet states in molecular crystals created by light excitation. Transfer of the initial electron polarization to nuclear spins has been studied in the presence of radiofrequency excitation; the experiments have been performed with different pulse sequences using different doped molecular systems. The experimental results clearly demonstrate the dominant role of coherent mechanisms of spin order transfer, which manifest themselves in well pronounced oscillations...
March 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28314207/a-pulse-sequence-for-singlet-to-heteronuclear-magnetization-transfer-s2hm
#15
Gabriele Stevanato, James Eills, Christian Bengs, Giuseppe Pileio
We have recently demonstrated, in the context of para-hydrogen induced polarization (PHIP), the conversion of hyperpolarized proton singlet order into heteronuclear magnetisation can be efficiently achieved via a new sequence named S2hM (Singlet to heteronuclear Magnetisation). In this paper we give a detailed theoretical description, supported by an experimental illustration, of S2hM. Theory and experiments on thermally polarized samples demonstrate the proposed method is robust to frequency offset mismatches and radiofrequency field inhomogeneities...
March 6, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28302606/trochlear-groove-and-trochlear-cistern-useful-anatomic-landmarks-for-identifying-the-tentorial-segment-of-cranial-nerve-iv-on-mri
#16
P M Bunch, H R Kelly, D A Zander, H D Curtin
BACKGROUND AND PURPOSE: The trochlear groove and trochlear cistern are anatomic landmarks closely associated with the tentorial segment of cranial nerve IV. The purposes of this study were to describe the MR imaging appearances of the trochlear groove and trochlear cistern and to test our hypothesis that knowledge of these anatomic landmarks facilitates identification of cranial nerve IV in routine clinical practice. MATERIALS AND METHODS: For this retrospective study, consecutive MR imaging examinations of the sinuses performed in 25 patients (50 sides) at our institution were reviewed...
March 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28298111/-1-h-2-h-cross-polarization-nmr-in-fast-spinning-solids-by-adiabatic-sweeps
#17
Sungsool Wi, Robert Schurko, Lucio Frydman
Cross-polarization (CP) experiments employing frequency-swept radiofrequency (rf) pulses have been successfully used in static spin systems for obtaining broadband signal enhancements. These experiments have been recently extended to heteronuclear I, S = spin-1/2 nuclides under magic-angle spinning (MAS), by applying adiabatic inversion pulses along the S (low-γ) channel while simultaneously applying a conventional spin-locking pulse on the I-channel ((1)H). This study explores an extension of this adiabatic frequency sweep concept to quadrupolar nuclei, focusing on CP from (1)H (I = 1/2) to (2)H spins (S = 1) undergoing fast MAS (νr = 60 kHz)...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28285487/load-carriage-related-paresthesias-part-2-meralgia-paresthetica
#18
Joseph J Knapik, Katy Reynolds, Robin Orr, Rodney Pope
This is the second of a two-part series addressing symptoms, evaluation, and treatment of load carriage- related paresthesias. Part 1 addressed rucksack palsy and digitalgia paresthetica; here, meralgia paresthetica (MP) is discussed. MP is a mononeuropathy involving the lateral femoral cutaneous nerve (LFCN). MP has been reported in load carriage situations where the LFCN was compressed by rucksack hipbelts, pistol belts, parachute harnesses, and body armor. In the US military, the rate of MP is 6.2 cases/10,000 personyears...
2017: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/28285143/adiabatic-sweep-cross-polarization-magic-angle-spinning-nmr-of-half-integer-quadrupolar-spins
#19
Sungsool Wi, Chul Kim, Robert Schurko, Lucio Frydman
The use of frequency-swept radiofrequency (rf) pulses for enhancing signals in the magic-angle spinning (MAS) spectra of half-integer quadrupolar nuclides was explored. The broadband adiabatic inversion cross-polarization magic-angle spinning (BRAIN-CPMAS) method, involving an adiabatic inversion pulse on the S-channel and a simultaneous rectangular spin-lock pulse on the I-channel ((1)H), was applied to I(1/2)→S(3/2) systems. Optimal BRAIN-CPMAS matching conditions were found to involve low rf pulse strengths for both the I- and S-spin channels...
March 2, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28274357/laser-and-light-based-treatments-of-acne-and-acne-scarring
#20
Macrene Alexiades
The treatment of acne and acne scarring with lasers and light-based and energy-based technologies has become an integral component of our therapeutic arsenal. Lasers including infrared wavelengths and pulsed dye lasers; light devices including blue light, red light, and broadband light; and photodynamic therapy with aminolevulinic acid and methylaminolevulinic acid have been shown to be effective in the treatment of acne vulgaris. The optimal outcomes are achieved with photodynamic therapy combined with medical therapy...
March 2017: Clinics in Dermatology
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