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High intensity focused ultrasound

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https://www.readbyqxmd.com/read/28430035/noninvasive-neuromodulation-and-thalamic-mapping-with-low-intensity-focused-ultrasound
#1
Robert F Dallapiazza, Kelsie F Timbie, Stephen Holmberg, Jeremy Gatesman, M Beatriz Lopes, Richard J Price, G Wilson Miller, W Jeffrey Elias
OBJECTIVE Ultrasound can be precisely focused through the intact human skull to target deep regions of the brain for stereotactic ablations. Acoustic energy at much lower intensities is capable of both exciting and inhibiting neural tissues without causing tissue heating or damage. The objective of this study was to demonstrate the effects of low-intensity focused ultrasound (LIFU) for neuromodulation and selective mapping in the thalamus of a large-brain animal. METHODS Ten Yorkshire swine ( Sus scrofa domesticus) were used in this study...
April 21, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28421665/evaluation-of-hifu-ablation-for-uterine-fibroids-an-ideal-prospective-exploration-study
#2
Jinyun Chen, Youping Li, Zhibiao Wang, Peter McCulloch, Liang Hu, Wenzhi Chen, Guanjian Liu, Jing Li, Jinghe Lang
OBJECTIVE: To evaluate the clinical outcomes of High intensity focused ultrasound (HIFU) and surgery in treating uterine fibroids, and prepare for a definitive randomised trial. DESIGN: Prospective multicentre patient choice cohort study (IDEAL Exploratory study) of HIFU, myomectomy or hysterectomy for treating symptomatic uterine fibroids. SETTING: 20 Chinese hospitals. POPULATION OR SAMPLE: 2411 Chinese women with symptomatic fibroids...
April 19, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28419814/high-intensity-focused-ultrasound-for-treatment-of-symptomatic-benign-thyroid-nodules-a-prospective-study
#3
Brian Hung-Hin Lang, Yu-Cho Woo, Carlos K H Wong
Purpose To evaluate first-year efficacy and changes in pressure symptoms and health-related quality of life (HRQOL) after ultrasonographically (US) guided high-intensity focused ultrasound (HIFU) ablation of symptomatic benign thyroid nodules. Materials and Methods After ethics approval and informed consent were obtained, a prospective trial was conducted. Patients with a symptomatic benign thyroid nodule were given a choice of HIFU treatment or active surveillance. Clinical and US examinations, pressure symptom scores (visual analog scale), and HRQOL questionnaires (short form-12 survey) were evaluated at baseline and at 3, 6, and 12 months...
April 18, 2017: Radiology
https://www.readbyqxmd.com/read/28413682/multi-focal-hifu-reduces-cavitation-in-mild-hyperthermia
#4
Vandiver Chaplin, Charles F Caskey
BACKGROUND: Mild-hyperthermia therapy (40-45 °C) with high-intensity focused ultrasound (HIFU) is a technique being considered in a number of different treatments such as thermally activated drug delivery, immune-stimulation, and as a chemotherapy adjuvant. Mechanical damage and loss of cell viability associated with HIFU-induced acoustic cavitation may pose a risk during these treatments or may hinder their success. Here we present a method that achieves mild heating and reduces cavitation by using a multi-focused HIFU beam...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28412225/enhancing-tissue-permeability-with-mri-guided-preclinical-focused-ultrasound-system-in-rabbit-muscle-from-normal-tissue-to-vx2-tumor
#5
Yao Sun, Xiaobing Xiong, Darpan Pandya, Youngkyoo Jung, Akiva Mintz, Satoru Hayasaka, Thaddeus J Wadas, King C P Li
High Intensity Focused Ultrasound (HIFU) is an emerging noninvasive, nonionizing physical energy based modality to ablate solid tumors with high power, or increase local permeability in tissues/tumors in pulsed mode with relatively low power. Compared with traditional ablative HIFU, nondestructive pulsed HIFU (pHIFU) is present in the majority of novel applications recently developed for enhancing the delivery of drugs and genes. Previous studies have demonstrated the capability of pHIFU to change tissue local permeability for enhanced drug delivery in both mouse tumors and mouse muscle...
April 12, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28410986/predictors-of-biochemical-recurrence-after-primary-focal-cryosurgery-hemiablation-for-localized-prostate-cancer-a-multi-institutional-analytic-comparison-of-phoenix-and-stuttgart-criteria
#6
Michael Kongnyuy, Michael J Lipsky, Shahidul Islam, Dennis J Robins, Shaun Hager, Daniel M Halpern, Kaitlin E Kosinski, Jeffrey T Schiff, Anthony T Corcoran, Sven Wenske, Aaron E Katz
BACKGROUND: The Phoenix definition (PD) and Stuttgart definition (SD) designed to determine biochemical recurrence (BCR) in patients with postradiotherapy and high-intensity focused ultrasound organ-confined prostate cancer are being applied to follow patients after cryosurgery. We sought to identify predictors of BCR using the PD and SD criteria in patients who underwent primary focal cryosurgery (PFC). MATERIALS AND METHODS: We performed a retrospective review of patients who underwent PFC (hemiablation) at 2 referral centers from 2000 to 2014...
April 11, 2017: Urologic Oncology
https://www.readbyqxmd.com/read/28410101/medical-instrument-detection-in-3-dimensional-ultrasound-data-volumes
#7
Arash Pourtaherian, Harm Scholten, Lieneke Kusters, Svitlana Zinger, Nenad Mihajlovic, Alexander Kolen, Fei Zou, Gary Ng, Hendrikus Korsten, Peter de With
Ultrasound-guided medical interventions are broadly applied in diagnostics and therapy, e.g. regional anesthesia or ablation. A guided intervention using 2D ultrasound is challenging due to the poor instrument visibility, limited field of view and the multi-fold coordination of the medical instrument and ultrasound plane. Recent 3D ultrasound transducers can improve the quality of the image-guided intervention if an automated detection of the needle is used. In this paper, we present a novel method for detecting medical instruments in 3D ultrasound data that is solely based on image processing techniques and validated on various ex-vivo and in-vivo datasets...
April 7, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28402267/contrast-enhanced-ultrasound-evaluation-of-pancreatic-cancer-xenografts-in-nude-mice-after-irradiation-with-sub-threshold-focused-ultrasound-for-tumor-ablation
#8
Yi Hui Gao, Lei Wu, Rui Wang, Qian Guo, Yi Ni Chen, Bing Hu, Li Xin Jiang
We evaluated the efficacy of contrast-enhanced ultrasound for assessing tumors after irradiation with sub-threshold focused ultrasound (FUS) ablation in pancreatic cancer xenografts in nude mice. Thirty tumor-bearing nude mice were divided into three groups: Group A received sham irradiation, Group B received a moderate-acoustic energy dose (sub-threshold), and Group C received a high-acoustic energy dose. In Group B, B-mode ultrasound (US), color Doppler US, and dynamic contrast-enhanced ultrasound (DCE-US) studies were conducted before and after irradiation...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28385253/prostate-cancer-state-of-the-art-imaging-and-focal-treatment
#9
REVIEW
D A Woodrum, A Kawashima, K R Gorny, L A Mynderse
In 2016, it is estimated 180,890 men are newly diagnosed with prostate cancer and 3,306,760 men live with prostate cancer in the United States. The introduction of multiparametric (mp) magnetic resonance imaging (MRI) of the prostate, standardised interpretation guidelines such as Prostate Imaging Reporting and Data System (PI-RADS version 2), and MRI-based targeted biopsy has improved detection of clinically significant prostate cancer. Accurate risk stratification (Gleason grade/score and tumour stage) using imaging and image-guided targeted biopsy has become critical for the management of patients with prostate cancer...
April 3, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28384646/enhanced-thermal-effect-using-magnetic-nano-particles-during-high-intensity-focused-ultrasound
#10
Surendra Balaji Devarakonda, Matthew R Myers, Dushyanth Giridhar, Seyed Ahmad Reza Dibaji, Rupak Kumar Banerjee
Collateral damage and long sonication times occurring during high-intensity focused ultrasound (HIFU) ablation procedures limit clinical advancement. In this reserarch, we investigated whether the use of magnetic nano-particles (mNPs) can reduce the power required to ablate tissue or, for the same power, reduce the duration of the procedure. Tissue-mimicking phantoms containing embedded thermocouples and physiologically acceptable concentrations (0%, 0.0047%, and 0.047%) of mNPs were sonicated at acoustic powers of 5...
2017: PloS One
https://www.readbyqxmd.com/read/28384210/thermal-characteristics-of-non-biological-vessel-phantoms-for-treatment-of-varicose-veins-using-high-intensity-focused-ultrasound
#11
Mi-Sun Kim, Ju-Young Kim, Si-Cheol Noh, Heung-Ho Choi
The ultrasonic treatment of varicose veins uses high-intensity focused ultrasound, in which a blood vessel is contracted by converting acoustic energy into thermal energy. In this study, we propose a phantom of varicose veins that can be applied for the efficient evaluation of ultrasonic treatment in varicose veins. The proposed phantom consisted of glycerol base tissue equivalent material, vessel mimic tube, and blood mimic substances. The vessel mimic tube was placed inner glycerol phantom and it was filled with blood mimic substances...
2017: PloS One
https://www.readbyqxmd.com/read/28373906/a-meta-analysis-of-palliative-treatment-of-pancreatic-cancer-with-high-intensity-focused-ultrasound
#12
Susan Dababou, Cristina Marrocchio, Jarrett Rosenberg, Rachelle Bitton, Kim Butts Pauly, Alessandro Napoli, Joo Ha Hwang, Pejman Ghanouni
BACKGROUND: Pancreatic adenocarcinoma is currently the fourth-leading cause of cancer-related death. Up to 60-90% of patients with advanced disease suffer cancer-related pain, severely impacting their quality of life. Current management involves primarily pharmacotherapy with opioid narcotics and celiac plexus neurolysis; unfortunately, both approaches offer transient relief and cause undesired side-effects. High intensity focused ultrasound (HIFU) is a non-invasive thermal ablation technique that has been used to treat pancreatic cancer...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28373480/salvage-robotic-assisted-laparoscopic-radical-prostatectomy-experience-with-14-cases
#13
Yen-Chuan Ou, Sheng-Chun Hung, Li-Hua Hwang, Chun-Kuang Yang, Siu-Wan Hung, Min-Che Tung
AIM: To report the outcomes of salvage robot-assisted radical prostatectomy (S-RaRP). PATIENTS AND METHODS: Fourteen patients underwent S-RaRP. The mean initial prostatic-specific antigen level was 14.3 ng/ml and mean Gleason score was 6.93. Initial definitive treatment was external irradiation in 11 cases, cyberknife in two, and high-intensity focused ultrasound in one. Time from definitive treatment to S-RaRP was a mean of 36.5 months. RESULTS: The mean console time was 134...
April 2017: Anticancer Research
https://www.readbyqxmd.com/read/28372398/a-multimodal-instrument-for-real-time-in-situ-study-of-ultrasound-and-cavitation-mediated-drug-delivery
#14
Shuning Bian, Anjali Seth, Dan Daly, Robert Carlisle, Eleanor Stride
The development of a multimodal instrument capable of real-time in situ measurements of cavitation activity and effect in tissue mimicking phantoms during ultrasound and cavitation mediated drug delivery experiments is described here. The instrument features an acoustic arm that can expose phantoms to high-intensity focused-ultrasound while measuring cavitation activity and an optical arm that monitors cavitation effect using confocal microscopy. This combination of modalities allows real-time in situ characterisation of drug delivery in tissue and tissue mimicking phantoms during ultrasound and cavitation mediated drug delivery experiments...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28372123/numerical-study-of-a-confocal-ultrasonic-setup-for-cavitation-creation
#15
Maxime Lafond, Fabrice Prieur, Françoise Chavrier, Jean-Louis Mestas, Cyril Lafon
Acoustic cavitation has found a wide range of applications in the last few decades. For potential applications involving cavitation, the acoustic characteristics of a confocal ultrasonic setup are studied: two high-intensity focused ultrasound transducers are mounted so that their focal points overlap. A mathematical simulator is developed that takes into account nonlinear propagation, absorption, and diffraction. Each one of these physical effects is solved in the frequency domain for successive planes. Comparing the confocal setup with equivalent single transducer setups, it is shown that, with the confocal configuration, nonlinear distortion of the waveform is reduced, resulting in a greater peak rarefactional pressure and a lower peak positive pressure...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28355119/high-intensity-focused-ultrasound-for-the-treatment-of-prostate-cancer-a-review
#16
Christian G Chaussy, Stefan Thüroff
Over the past 25 years, the average life expectancy for men has increased almost 4 years, and the age of prostate cancer detection has decreased an average of 10 years with diagnosis increasingly made at early-stage disease where curative therapy is possible. These changing trends in the age and extent of malignancy at diagnosis have revealed limitations in conventional curative therapies for prostate cancer, including a significant risk of aggressive cancer recurrence, and the risk of long-term genitourinary morbidity and its detrimental impact on patient's quality of life (QOL)...
April 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28350139/upregulation-of-mir-137-reverses-sorafenib-resistance-and-cancer-initiating-cell-phenotypes-by-degrading-ant2-in-hepatocellular-carcinoma
#17
Ai-Qing Lu, Bin Lv, Fei Qiu, Xiao-Yun Wang, Xiao-Hua Cao
Hepatocellular carcinoma (HCC) is one of the most common malignancies worldwide. More than 80% of patients with HCC are not good candidates for curative surgical resection due to advanced liver cirrhosis caused by underlying chronic hepatitis virus (B or C) infection. Sorafenib, an oral multikinase inhibitor, is the only approved agent for the treatment of advanced HCC. Although, sorafenib currently sets the new standard for advanced HCC treatment, tumor response rates are usually quite low. An understanding of the underlying mechanisms for sorafenib resistance is critical...
April 2017: Oncology Reports
https://www.readbyqxmd.com/read/28342558/high-intensity-focused-ultrasound-as-first-line-treatment-in-patients-with-chronic-angle-closure-glaucoma-at-risk-for-malignant-glaucoma
#18
M Graber, Z Khoueir, A Beauchet, N Benhatchi, S Hammoud, Y Lachkar
PURPOSE: Evaluation of high intensity focused ultrasound (HIFU) transscleral cyclocoagulation as an alternative to trabeculectomy in the treatment of refractory chronic angle closure glaucoma (CACG). METHODS: This prospective one armed single center pilot study was conducted on patients with medically uncontrolled CACG who underwent high intensity focused ultrasound (HIFU) cyclocoagulation as first line surgical treatment, using the Eye-OP1 HIFU device (Eyetechcare-Rillieux-la-Pape, France) driven by ultrasound biomicroscopic (UBM) ciliary body localization...
April 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28338392/the-effects-of-low-intensity-therapeutic-ultrasound-litus-on-measurable-outcomes-a-critically-appraised-topic
#19
Sarah Daniels, Gabriela Santiago, Jennifer Cuchna, Bonnie Van Lunen
Therapeutic Ultrasound (US) is a popular modality among healthcare professionals and is used to treat a variety of musculoskeletal conditions.(1) Throughout the past 70 years of clinical use,(2) ultrasound has been shown to be an effective way to decrease pain,(2,3) increase tissue temperature,(4) and decrease tissue stiffness of trigger points,(5) amidst other benefits. Treatment parameters with US are typically high-intensity and occur over a short period of time (minutes). The US machine is large and stationary, forcing patients to be non-mobile for the duration of their treatment...
March 24, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28333640/integrated-hifu-drive-system-on-a-chip-for-cmut-based-catheter-ablation-system
#20
Omid Farhanieh, Ali Sahafi, Rupak Bardhan Roy, Arif Sanli Ergun, Ayhan Bozkurt
Conventional High Intensity Focused Ultrasound (HIFU) is a therapeutic modality which is extracorporeally administered. In applications where a relatively small HIFU lesion is required, an intravascular HIFU probe can be deployed to the ablation site. In this paper, we demonstrate the design and implementation a fully integrated HIFU drive system on a chip to be placed on a 6 Fr catheter probe. An 8-element capacitive micromachined ultrasound transducer (CMUT) ring array of 2 mm diameter has been used as the ultrasound source...
March 20, 2017: IEEE Transactions on Biomedical Circuits and Systems
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