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https://www.readbyqxmd.com/read/27882240/t2-based-temperature-monitoring-in-bone-marrow-for-mr-guided-focused-ultrasound
#1
Eugene Ozhinsky, Misung Han, Matthew Bucknor, Roland Krug, Viola Rieke
BACKGROUND: Current clinical protocols for MR-guided focused ultrasound (MRgFUS) treatment of osseous lesions, including painful bone metastases and osteoid osteomas, rely on measurement of the temperature change in adjacent muscle to estimate the temperature of the bone. The goal of this study was to determine if T2-based thermometry could be used to monitor the temperature change in bone marrow during focused ultrasound ablation of bone lesions. METHODS: We investigated the dependence of T2 on temperature in ex vivo bovine yellow bone marrow at 3T and studied the influence of acquisition parameters on the T2 measurements...
2016: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/27790950/magnetic-resonance-texture-parameters-are-associated-with-ablation-efficiency-in-mr-guided-high-intensity-focussed-ultrasound-treatment-of-uterine-fibroids
#2
Arnaud Hocquelet, Baudouin Denis de Senneville, Nora Frulio, Cécile Salut, Mounir Bouzgarrou, Panteleimon Papadopoulos, Hervé Trillaud
OBJECTIVES: The objective of this study is to assess the association between texture parameter analysis derived from T2-weighted images and efficiency of magnetic resonance-guided focussed ultrasound (MRgFUS) ablation for the treatment of uterine fibroids. MATERIALS AND METHODS: Fifty-five women treated by MRgFUS were included in this retrospective analysis. Texture parameters were calculated using three 2D regions of interest placed on three consecutive slices on the same sagittal 3D T2-weighted images obtained at the beginning of MRgFUS ablation...
October 28, 2016: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/27784190/acoustic-characterization-of-thiel-liver-for-magnetic-resonance-guided-focused-ultrasound-treatment
#3
Ioannis Karakitsios, Joyce Joy, Senay Mihcin, Andreas Melzer
BACKGROUND: The purpose of this work was to measure the essential acoustic parameters, i.e. acoustic impedance, reflection coefficient, attenuation coefficient, of Thiel embalmed human and animal liver. The Thiel embalmed tissue can be a promising, pre-clinical model to study liver treatment with Magnetic Resonance-guided Focused Ultrasound (MRgFUS). MATERIAL AND METHODS: Using a single-element transducer and the contact pulse-echo method, the acoustic parameters, i...
October 27, 2016: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/27751409/a-retrospective-study-of-magnetic-resonance-guided-focused-ultrasound-ablation-for-uterine-myoma-in-taiwan
#4
Sheng-Ling Tung, Ting-Ywan Chou, Hung-Shi Tseng, Chi-Ming Lee
OBJECTIVE: To report our experiences with 40 patients who were treated with magnetic resonance-guided focused ultrasound surgery (MRgFUS) for uterine fibroids and their 6-month follow-up status. MATERIALS AND METHODS: A total of 40 patients with uterine fibroids underwent MRgFUS from January 2009 to November 2011. The Uterine Fibroid Symptoms and Quality of Life Questionnaire was used to determine the patients' Symptom Severity Scores (SSS) prior to and 6 months after treatment...
October 2016: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27699844/specialized-volumetric-thermometry-for-improved-guidance-of-mrgfus-in-brain
#5
Michael Marx, Pejman Ghanouni, Kim Butts Pauly
PURPOSE: MR thermometry is critical for safe and effective transcranial focused ultrasound. The current single-slice MR thermometry sequence cannot achieve all desired treatment monitoring requirements. We propose an approach in which the imaging requirements of different aspects of treatment monitoring are met by optimizing multiple sequences. METHODS: Imaging requirements were determined for three stages of MR-guided focused ultrasound brain treatment: 1) focal spot localization, 2) focal spot monitoring, and 3) background monitoring...
October 4, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27679142/intraoperative-monitoring-and-evaluation-of-mri-in-women-of-reproductive-age-after-previously-performed-uterine-artery-embolization-uae-and-mrgfus-ablation-of-fibroids
#6
I E Porotikova, L V Adamyan, T Y Gavrilova, E A Kulabukhova
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/27662675/pre-clinical-mri-guided-focused-ultrasound-a-review-of-systems-and-current-practices
#7
Nicholas Ellens, Ari Partanen
Effective pre-clinical research is a vital component in the development of MRI-guided focused ultrasound (MRgFUS) and its translation to clinic. In this review we seek to outline the challenges at hand for effective pre-clinical research, survey different solutions, and underline best practices. Furthermore, we summarize efforts to build and characterize dedicated pre-clinical MRgFUS equipment, including lab prototypes and available commercial products. Finally, we discuss constraints and considerations specific to using clinical MRgFUS equipment in preclinical research...
September 13, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27617244/clinical-consideration-of-treatment-to-ablate-uterine-fibroids-with-magnetic-resonance-imaging-guided-high-intensity-focused-ultrasound-mrgfus-sonalleve
#8
Jae-Hyeok Jeong, Gil Pyo Hong, Yu-Ri Kim, Jae-Eun Ha, Kyu-Sup Lee
OBJECTIVES: Magnetic resonance imaging (MRI)-guided high intensity focused ultrasound surgery (MRgFUS) is a newly emerging non-invasive technique for the treatment of uterine fibroids. The purpose of this study is to review the clinical impact of MRgFUS. METHODS: This study examined 157 patients. The high intensity focused ultrasound (HIFU) utilized in this study was Philips Achieva 1.5 Tesla MR (Philips Healthcare, Best, the Netherlands) and Sonalleve HIFU system...
August 2016: Journal of Menopausal Medicine
https://www.readbyqxmd.com/read/27597889/open-source-small-animal-magnetic-resonance-guided-focused-ultrasound-system
#9
Megan E Poorman, Vandiver L Chaplin, Ken Wilkens, Mary D Dockery, Todd D Giorgio, William A Grissom, Charles F Caskey
BACKGROUND: MR-guided focused ultrasound or high-intensity focused ultrasound (MRgFUS/MRgHIFU) is a non-invasive therapeutic modality with many potential applications in areas such as cancer therapy, drug delivery, and blood-brain barrier opening. However, the large financial costs involved in developing preclinical MRgFUS systems represent a barrier to research groups interested in developing new techniques and applications. We aim to mitigate these challenges by detailing a validated, open-source preclinical MRgFUS system capable of delivering thermal and mechanical FUS in a quantifiable and repeatable manner under real-time MRI guidance...
2016: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/27587029/design-and-validation-of-an-mr-conditional-robot-for-transcranial-focused-ultrasound-surgery-in-infants
#10
Karl D Price, Vivian W Sin, Charles Mougenot, Samuel Pichardo, Thomas Looi, Adam C Waspe, James M Drake
PURPOSE: Current treatment of intraventricular hemorrhage (IVH) involves cerebral shunt placement or an invasive brain surgery. Magnetic resonance-guided focused ultrasound (MRgFUS) applied to the brains of pediatric patients presents an opportunity to treat IVH in a noninvasive manner, termed "incision-less surgery." Current clinical and research focused ultrasound systems lack the capability to perform neonatal transcranial surgeries due to either range of motion or dexterity requirements...
September 2016: Medical Physics
https://www.readbyqxmd.com/read/27586131/first-experience-of-real-time-elastography-with-transvaginal-approach-in-assessing-response-to-mrgfus-treatment-of-uterine-fibroids
#11
Chiara Marigliano, Giovanna Panzironi, Luisa Molisso, Alessandra Pizzuto, Federica Ciolina, Alessandro Napoli, Paolo Ricci
PURPOSE: Definition of the role of real-time elastography (RTE) in the evaluation of response to treatment of uterine fibroids using MRgFUS in symptomatic patients. MATERIALS AND METHODS: 28 women with 34 symptomatic fibroids, selected for MRgFUS, were enrolled. The patients were preliminarily studied with MRI and suprapubic and transvaginal ultrasound examination including RTE; the follow-up was performed immediately after treatment, at 3 months and 12 months with the same technique...
September 1, 2016: La Radiologia Medica
https://www.readbyqxmd.com/read/27567615/magnetic-resonance-guided-focused-ultrasound-for-the-treatment-of-painful-bone-metastases-role-of-apparent-diffusion-coefficient-adc-and-dynamic-contrast-enhanced-dce-mri-in-the-assessment-of-clinical-outcome
#12
Michele Anzidei, Alessandro Napoli, Beatrice Sacconi, Fabrizio Boni, Vincenzo Noce, Michele Di Martino, Luca Saba, Carlo Catalano
PURPOSE: To assess the correlation between functional MRI, including ADC values obtained from DWI and DCE, and clinical outcome in patients with bone metastases treated with MRgFUS. METHODS AND MATERIALS: Twenty-three patients with symptomatic bone metastases underwent MRgFUS treatment (ExAblate 2100 system InSightec) for pain palliation. All patients underwent clinical and imaging follow-up examinations at 1, 3 and 6 months after treatment. Visual Analog Scale (VAS) score was used to evaluate treatment efficacy in terms of pain palliation while ADC maps obtained by DWI sequences, and DCE data were used for quantitative assessment of treatment response at imaging...
August 27, 2016: La Radiologia Medica
https://www.readbyqxmd.com/read/27448456/feasibility-of-an-electromagnetic-compatibility-method-for-mrgfus-using-a-wire-mesh-screen
#13
Hao Wu, Guofeng Shen, Yazhu Chen
This study evaluated an electromagnetic compatibility method for high-intensity focused ultrasound (HIFU) and magnetic resonance (MR) imaging in an MR-guided focused ultrasound surgery using a conductive wire mesh screen. This screen has a good ultrasound transmission and shielding effectiveness. A hybrid acoustic simulation method was developed to analyze the effects of mesh parameters and the HIFU working frequency on the acoustic field. Experiments were performed to measure both acoustic pressure profile and radiated electromagnetic noise...
December 2016: Ultrasonics
https://www.readbyqxmd.com/read/27443328/mri-guided-focused-ultrasound-ablation-of-lumbar-medial-branch-nerve-feasibility-and-safety-study-in-a-swine-model
#14
Elena A Kaye, Sebastien Monette, Govindarajan Srimathveeravalli, Majid Maybody, Stephen B Solomon, Amitabh Gulati
PURPOSE: About 10-40% of chronic low back pain cases involve facet joints, which are commonly treated with lumbar medial branch (MB) radiofrequency neurotomy. Magnetic resonance imaging-guided focused ultrasound (MRgFUS), a non-invasive, non-ionising ablation modality used to treat tumours, neuropathic pain and painful bone metastasis can also be used to disrupt nerve conduction. This work's purpose was to study the feasibility and safety of direct MRgFUS ablation of the lumbar MB nerve in acute and subacute swine models...
November 2016: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/27418429/focal-point-determination-in-magnetic-resonance-guided-focused-ultrasound-using-tracking-coils
#15
Bryant T Svedin, Michael J Beck, J Rock Hadley, Robb Merrill, Joshua T de Bever, Bradley D Bolster, Allison Payne, Dennis L Parker
PURPOSE: To develop a method for rapid prediction of the geometric focus location in MR coordinates of a focused ultrasound (US) transducer with arbitrary position and orientation without sonicating. METHODS: Three small tracker coil circuits were designed, constructed, attached to the transducer housing of a breast-specific MR-guided focused US (MRgFUS) system with 5 degrees of freedom, and connected to receiver channel inputs of an MRI scanner. A one-dimensional sequence applied in three orthogonal directions determined the position of each tracker, which was then corrected for gradient nonlinearity...
July 15, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27399411/132%C3%A2-a-randomized-sham-controlled-trial-of-transcranial-magnetic-resonance-guided-focused-ultrasound-thalamotomy-trial-for-the-treatment-of-tremor-dominant-idiopathic-parkinson-disease
#16
Aaron E Bond, Robert Dallapiazza, Diane Huss, Amy L Warren, Scott Sperling, Ryder Gwinn, Binit B Shah, W Jeffrey Elias
INTRODUCTION: Traditional stereotactic radiofrequency thalamotomy has been used with success in medication-refractory tremor-dominant Parkinson disease (PD). Recently, transcranial magnetic resonance-guided focused ultrasound (MRgFUS) has been used to successfully perform thalamotomy for essential tremor. We designed a double-blinded, randomized controlled trial to investigate the effectiveness of MRgFUS thalamotomy in tremor-dominant PD. METHODS: Patients with medication-refractory, tremor-dominant PD were enrolled in the 2-center study and randomly assigned 1:2 to receive either a sham procedure or treatment...
August 2016: Neurosurgery
https://www.readbyqxmd.com/read/27385508/sensitivity-of-tissue-properties-derived-from-mrgfus-temperature-data-to-input-errors-and-data-inclusion-criteria-ex-vivo-study-in-porcine-muscle
#17
Y C Shi, D L Parker, C R Dillon
This study evaluates the sensitivity of two magnetic resonance-guided focused ultrasound (MRgFUS) thermal property estimation methods to errors in required inputs and different data inclusion criteria. Using ex vivo pork muscle MRgFUS data, sensitivities to required inputs are determined by introducing errors to ultrasound beam locations (r error  =  -2 to 2 mm) and time vectors (t error  =  -2.2 to 2.2 s). In addition, the sensitivity to user-defined data inclusion criteria is evaluated by choosing different spatial (r fit  =  1-10 mm) and temporal (t fit  =  8...
August 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27261569/mri-compatible-bone-phantom-for-evaluating-ultrasonic-thermal-exposures
#18
Georgios Menikou, Marinos Yiannakou, Christos Yiallouras, Cleanthis Ioannides, Christakis Damianou
OBJECTIVE: The goal of the proposed study was the development of a magnetic resonance imaging (MRI) compatible bone phantom suitable for evaluating focused ultrasound protocols. MATERIALS AND METHODS: High resolution CT images were used to segment femur bone. The segmented model was manufactured with (Acrylonitrile Butadiene Styrene) ABS plastic using a 3-D printer. The surrounding skeletal muscle tissue was mimicked using an agar-silica-evaporated milk gel (2% w/v-2% w/v-40% v/v)...
September 2016: Ultrasonics
https://www.readbyqxmd.com/read/27213043/establishing-a-clinical-service-for-the-treatment-of-osteoid-osteoma-using-magnetic-resonance-guided-focused-ultrasound-overview-and-guidelines
#19
REVIEW
Michael J Temple, Adam C Waspe, Joao G Amaral, Alessandro Napoli, Suzanne LeBlang, Pejman Ghanouni, Matthew D Bucknor, Fiona Campbell, James M Drake
Recent studies have demonstrated the effectiveness of magnetic resonance-guided focused ultrasound (MRgFUS) in the treatment of osteoid osteoma (OO), a painful, benign bone tumor. As MRgFUS is a noninvasive and radiation-free treatment, it stands to replace the current standard of care, percutaneous radiofrequency, or laser thermal ablation. Within an institution, creation of a clinical OO MRgFUS treatment program would not only provide cutting edge medical treatment at the current time but would also establish the foundation for an MRgFUS clinical service to introduce treatments currently under development into clinical practice in the future...
2016: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/27197743/treatment-of-focal-benign-lesions-of-the-bone-mrgfus-and-rfa
#20
Carlo Masciocchi, Francesco Arrigoni, Alice La Marra, Silvia Mariani, Luigi Zugaro, Antonio Barile
The objective of this study was to evaluate the role of MR-guided focused ultrasound surgery and radiofrequency ablation in the management of bone and soft-tissue lesions. Musculoskeletal interventional radiology represents an interesting option for the treatment of benign bone and soft-tissue lesions to avoid the invasiveness of surgery and related risks. The imaging techniques now available, besides representing an optimal guide, allow control of the temperature reached in the region of interest, avoiding or minimizing damage to the sensitive structures surrounding the lesion...
October 2016: British Journal of Radiology
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