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radiofrequence prostate

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https://www.readbyqxmd.com/read/28434661/retrospective-review-of-percutaneous-image-guided-ablation-of-oligometastatic-prostate-cancer-a-single-institution-experience
#1
Andrew J Erie, Jonathan M Morris, Brian T Welch, A Nicholas Kurup, Adam J Weisbrod, Thomas D Atwell, Grant D Schmit, Eugene D Kwon, Matthew R Callstrom
PURPOSE: To retrospectively review and report the efficacy and safety of percutaneous image-guided ablation (cryoablation or radiofrequency ablation) in the treatment of oligometastatic prostate cancer. MATERIALS AND METHODS: An institutional registry was retrospectively reviewed and revealed 16 patients with oligometastatic prostate cancer (median age, 67 y; range, 50-86 y) who underwent percutaneous image-guided ablation to treat 18 metastatic sites. A subgroup of 7 patients with 8 metastases were androgen-deprivation therapy (ADT)-naïve and underwent ablation to delay initiation of ADT...
April 20, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28378237/successful-ablation-of-lymph-nodes-using-irreversible-electroporation-ire-in-a-porcine-survival-model
#2
Stefan Fritz, Christof M Sommer, Thomas Longerich, Clemens Kuhn-Neureuther, Boris Radeleff, Jens Werner, Thilo Hackert
BACKGROUND: Irreversible electroporation (IRE), a nonthermal injury ablation technique, has been shown to be effective and safe in various organs, such as in the kidney, liver, prostate, or in pancreas. In contrast to radiofrequency or microwave ablation, IRE is also effective in the neighborhood of major vessels. Many human cancers reveal lymphatic spread. The present study aimed to evaluate technical feasibility and safety of IRE in lymphatic tissue. To our knowledge, this is the first report showing successful IRE of lymph nodes in a standardized porcine survival model...
April 4, 2017: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/28349507/transfer-learning-from-rf-to-b-mode-temporal-enhanced-ultrasound-features-for-prostate-cancer-detection
#3
Shekoofeh Azizi, Parvin Mousavi, Pingkun Yan, Amir Tahmasebi, Jin Tae Kwak, Sheng Xu, Baris Turkbey, Peter Choyke, Peter Pinto, Bradford Wood, Purang Abolmaesumi
PURPOSE: We present a method for prostate cancer (PCa) detection using temporal enhanced ultrasound (TeUS) data obtained either from radiofrequency (RF) ultrasound signals or B-mode images. METHODS: For the first time, we demonstrate that by applying domain adaptation and transfer learning methods, a tissue classification model trained on TeUS RF data (source domain) can be deployed for classification using TeUS B-mode data alone (target domain), where both data are obtained on the same ultrasound scanner...
March 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28324777/a-feasibility-study-of-a-novel-spectral-method-using-radiofrequency-ultrasound-data-for-monitoring-laser-tissue-ablation
#4
Enrico Vannacci, Simona Granchi, Luca Breschi, Elena Biagi
This paper presents preliminary results of a new non-invasive ultrasound monitoring method called TUV (Thermotherapy Ultrasonic View) able to investigate structural tissue modifications caused by minimally invasive percutaneous laser ablation. The method, based on the spectral analysis of the raw ultrasound radiofrequency signal, develops spectral parameters in a multidimensional space and its N dimensions are represented by the central frequencies of the sub bands the signal spectrum is decomposed into. Signal processing has been performed on the data related to 7 laser treatments performed on 4 samples of removed prostatic glands which underwent laser ablation at power of 3W, 4W and 5W and energy of 1800J...
March 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28112824/in-vivo-imaging-of-electrical-properties-of-an-animal-tumor-model-with-an-8-channel-transceiver-array-at-7%C3%A2-t-using-electrical-properties-tomography
#5
Jiaen Liu, Qi Shao, Yicun Wang, Gregor Adriany, John Bischof, Pierre-Francois Van de Moortele, Bin He
PURPOSE: To develop and evaluate a technique for imaging electrical properties ((EPs), conductivity and permittivity) of an animal tumor model in vivo using MRI. METHODS: Electrical properties were reconstructed from the calculated EP gradient, which was derived using two sets of measured transmit B1 magnitude and relative phase maps with the sample and radiofrequency (RF) coil oriented in the positive and negative z-directions, respectively. An eight-channel transceiver microstrip array RF coil fitting the size of the animal was developed for generating and mapping B1 fields to reconstruct EPs...
January 23, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28046589/tu-h-campus-iep3-04-evaluation-of-changes-in-quantitative-ultrasound-parameters-during-prostate-radiotherapy
#6
M Najafi, A El Kaffas, B Han, D Cooper, S Hancock, D Hristov
PURPOSE: Clarity Autoscan ultrasound monitoring system allows acquisition of raw radiofrequency (RF) ultrasound data prior and during radiotherapy. This enables the computation of 3D Quantitative Ultrasound (QUS) tissue parametric maps from. We aim to evaluate whether QUS parameters undergo changes with radiotherapy and thus potentially be used as early predictors and/or markers of treatment response in prostate cancer patients. METHODS: In-vivo evaluation was performed under IRB protocol to allow data collection in prostate patients treated with VMAT whereby prostate was imaged through the acoustic window of the perineum...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28002239/feasibility-of-multiparametric-magnetic-resonance-imaging-of-the-prostate-at-7-t
#7
Miriam W Lagemaat, Bart W J Philips, Eline K Vos, Mark J van Uden, Jurgen J Fütterer, Sjoerd F Jenniskens, Tom W J Scheenen, Marnix C Maas
OBJECTIVES: The aim of this study was to evaluate the technical feasibility of prostate multiparametric magnetic resonance imaging (mpMRI) at a magnetic field strength of 7 T. MATERIALS AND METHODS: In this prospective institutional review board-approved study, 14 patients with biopsy-proven prostate cancer (mean age, 65.2 years; median prostate-specific antigen [PSA], 6.2 ng/mL), all providing signed informed consent, underwent 7 T mpMRI with an external 8-channel body-array transmit coil and an endorectal receive coil between September 2013 and October 2014...
May 2017: Investigative Radiology
https://www.readbyqxmd.com/read/27993667/convective-radiofrequency-water-vapor-thermal-therapy-with-rez%C3%A5-m-system-durable-two-year-results-of-randomized-controlled-and-prospective-crossover-studies-for-treatment-of-lower-urinary-tract-symptoms-due-to-benign-prostatic-hyperplasia
#8
Claus G Roehrborn, Steven N Gange, Marc C Gittelman, Kenneth A Goldberg, Kalpesh Patel, Neal D Shore, Richard M Levin, Michael Rousseau, J Randolf Beahrs, Jed Kaminetsky, Barrett E Cowan, Christopher H Cantrill, Lance A Mynderse, James C Ulchaker, Thayne R Larson, Christopher M Dixon, Kevin T McVary
PURPOSE: To report two-year outcomes of a multi-center randomized controlled trial plus one-year results of a crossover trial after treatment with convective radiofrequency water vapor thermal energy for lower urinary tract symptoms due to benign prostatic hyperplasia. MATERIALS AND METHODS: 197 men at least 50 years old with International Prostate Symptom Scores 13 or greater, maximum flow rate of 15 ml per second or less and prostate size 30 to 80 cc were randomized 2:1 between thermal therapy with the Rezūm® System and control...
December 16, 2016: Journal of Urology
https://www.readbyqxmd.com/read/27921028/two-year-results-after-convective-radiofrequency-water-vapor-thermal-therapy-of-symptomatic-benign-prostatic-hyperplasia
#9
Christopher M Dixon, Edwin Rijo Cedano, Dalibor Pacik, Vítězslav Vit, Gabriel Varga, Lennart Wagrell, Thayne R Larson, Lance A Mynderse
OBJECTIVE: The objective of this study was to assess the effectiveness and safety of convective radiofrequency (RF) water vapor thermal therapy in men with lower urinary tract symptoms (LUTS) associated with benign prostatic hyperplasia (BPH); a pilot study design with 2-year follow-up evaluations. PATIENTS AND METHODS: Men aged ≥45 years with an International Prostate Symptom Score ≥13, a maximum urinary flow rate (Qmax) ≤15 mL/s, and prostate volume 20-120 cc were enrolled in a prospective, open-label pilot study using convective RF water vapor energy with the Rezūm System...
2016: Research and Reports in Urology
https://www.readbyqxmd.com/read/27837451/percutaneous-image-guided-cryoablation-current-applications-and-results-in-the-oncologic-field
#10
REVIEW
Roberto Luigi Cazzato, Julien Garnon, Nitin Ramamurthy, Guillaume Koch, Georgia Tsoumakidou, Jean Caudrelier, Francesco Arrigoni, Luigi Zugaro, Antonio Barile, Carlo Masciocchi, Afshin Gangi
Percutaneous imaging-guided cryoablation (PICA) is a recently developed technique, which applies extreme hypothermia to destroy tumours under close imaging surveillance. It is minimally invasive, safe, repeatable, and does not interrupt or compromise other oncologic therapies. It presents several advantages over more established heat-based thermal ablation techniques (e.g. radiofrequency ablation; RFA) including intrinsic analgesic properties, superior monitoring capability on multi-modal imaging, ability to treat larger tumours, and preservation of tissue collagenous architecture...
December 2016: Medical Oncology
https://www.readbyqxmd.com/read/27770469/toward-imaging-the-body-at-10-5-tesla
#11
M Arcan Ertürk, Xiaoping Wu, Yiğitcan Eryaman, Pierre-François Van de Moortele, Edward J Auerbach, Russell L Lagore, Lance DelaBarre, J Thomas Vaughan, Kâmil Uğurbil, Gregor Adriany, Gregory J Metzger
PURPOSE: To explore the potential of performing body imaging at 10.5 Tesla (T) compared with 7.0T through evaluating the transmit/receive performance of similarly configured dipole antenna arrays. METHODS: Fractionated dipole antenna elements for 10.5T body imaging were designed and evaluated using numerical simulations. Transmit performance of antenna arrays inside the prostate, kidneys and heart were investigated and compared with those at 7.0T using both phase-only radiofrequency (RF) shimming and multi-spoke pulses...
January 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27670618/an-update-on-focal-therapy-for-prostate-cancer
#12
REVIEW
Marlon Perera, Nishanth Krishnananthan, Uri Lindner, Nathan Lawrentschuk
Globally, the increased uptake of serum PSA level screening led to an increase in the number of diagnoses of low-risk and intermediate-risk prostate cancer. Traditionally, these patients have been considered for either active surveillance programmes or radical whole-gland therapies, such as prostatectomy or radiotherapy. Focal therapy is an emerging treatment option that involves the focal ablation of prostate cancer with preservation of surrounding healthy tissue. This approach might result in reduced morbidity when compared with whole-gland therapies...
November 2016: Nature Reviews. Urology
https://www.readbyqxmd.com/read/27595377/new-and-established-technology-in-focal-ablation-of-the-prostate-a-systematic-review
#13
REVIEW
Massimo Valerio, Yannick Cerantola, Scott E Eggener, Herbert Lepor, Thomas J Polascik, Arnauld Villers, Mark Emberton
CONTEXT: Focal therapy of prostate cancer has been proposed as an alternative to whole-gland treatments. OBJECTIVE: To summarize the evidence regarding sources of energy employed in focal therapy. EVIDENCE ACQUISITION: Embase and Medline (PubMed) were searched from 1996 to October 31, 2015 following the Preferred Reporting Items for Systematic Reviews and Meta-analyses statement. Ongoing trials were selected from electronic registries. The stage of assessment of each source of energy was determined using the Idea, Development, Exploration, Assessment, Long-term study recommendations...
January 2017: European Urology
https://www.readbyqxmd.com/read/27573795/evaluation-of-frequency-domain-analysis-of-a-multiwavelength-photoacoustic-signal-for-differentiating-malignant-from-benign-and-normal-prostates-ex-vivo-study-with-human-prostates
#14
Saugata Sinha, Navalgund A Rao, Bhargava K Chinni, Vikram S Dogra
OBJECTIVES: The purpose of this study was to investigate the feasibility of differentiating malignant prostate from benign prostatic hyperplasia (BPH) and normal prostate tissue by performing frequency domain analysis of photoacoustic images acquired at 2 different wavelengths. METHODS: We performed multiwavelength photoacoustic imaging on freshly excised human prostate specimens taken from a total of 30 patients undergoing prostatectomy for biopsy-confirmed prostate cancer...
October 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27504133/development-of-a-magnetic-resonance-imaging-protocol-to-visualize-encapsulated-contrast-agent-markers-in-prostate-brachytherapy-recipients-initial-patient-experience
#15
Tze Yee Lim, Rajat J Kudchadker, Jihong Wang, Tharakeswara Bathala, Janio Szklaruk, Thomas J Pugh, Usama Mahmood, Geoffrey S Ibbott, Steven J Frank
PURPOSE: Computed tomography (CT)-based prostate post-implant dosimetry allows for definitive seed localization but is associated with high interobserver variation in prostate contouring. Currently, magnetic resonance imaging (MRI)-based post-implant dosimetry allows for accurate anatomical delineation but is limited due to inconsistent seed localization. Encapsulated contrast agent markers were previously proposed to overcome the seed localization limitation on MRI images by placing hyperintense markers adjacent to hypointense seeds...
June 2016: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/27370146/effect-of-pulse-sequence-parameter-selection-on-signal-strength-in-positive-contrast-mri-markers-for-mri-based-prostate-postimplant-assessment
#16
Tze Yee Lim, Rajat J Kudchadker, Jihong Wang, R Jason Stafford, Christopher MacLellan, Arvind Rao, Geoffrey S Ibbott, Steven J Frank
PURPOSE: For postimplant dosimetric assessment, computed tomography (CT) is commonly used to identify prostate brachytherapy seeds, at the expense of accurate anatomical contouring. Magnetic resonance imaging (MRI) is superior to CT for anatomical delineation, but identification of the negative-contrast seeds is challenging. Positive-contrast MRI markers were proposed to replace spacers to assist seed localization on MRI images. Visualization of these markers under varying scan parameters was investigated...
July 2016: Medical Physics
https://www.readbyqxmd.com/read/26962198/clinical-applications-of-stereotactic-radiation-therapy-for-oligometastatic-cancer-patients-a-disease-oriented-approach
#17
Umberto Ricardi, Serena Badellino, Andrea Riccardo Filippi
Oligometastases from solid tumors are currently recognized as a distinct clinical entity, corresponding to an intermediate state between local and widespread disease. It has been suggested that local ablative therapies (including surgery, radiofrequency ablation and radiation therapy) play an important role in this setting, in combination or not with systemic therapies, particularly in delaying disease progression and hopefully in increasing the median survival time. Stereotactic body radiation therapy (SBRT) rapidly emerged in recent years as one of the most effective and less toxic local treatment modalities for lung, liver, adrenal, brain and bone metastases...
March 8, 2016: Journal of Radiation Research
https://www.readbyqxmd.com/read/26893857/evaluation-of-in-vivo-efficacy-of-radiofrequency-ablation-with-d-sorbitol-in-animal-liver
#18
Asahiro Morishita, Teppei Sakamoto, Hideki Kobara, Tomoko Tadokoro, Kyoko Ohura, Koji Fujita, Joji Tani, Hisaaki Miyoshi, Hirohito Yoneyama, Takashi Himoto, Tsutomu Masaki
Percutaneous radiofrequency ablation (RFA) enables cauterization of liver cancer in a limited number of sessions without major complications. In contrast to the efficacy of this technique, the size of coagulation necrosis is limited due to increased impedance. D-sorbitol has been used as an irrigating fluid during transurethral resection of the prostate, since it is considered to be a dielectric fluid. In order to determine whether D-sorbitol enhances the effect of RFA, RFA was performed by slowly injecting 3% D-sorbitol near the tip of the RFA needle...
February 2016: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/26887533/a-16-channel-combined-loop-dipole-transceiver-array-for-7-tesla-body-mri
#19
M Arcan Ertürk, Alexander J E Raaijmakers, Gregor Adriany, Kâmil Uğurbil, Gregory J Metzger
PURPOSE: To develop a 16-channel transceive body imaging array at 7.0 T with improved transmit, receive, and specific absorption rate (SAR) performance by combining both loop and dipole elements and using their respective and complementary near and far field characteristics. METHODS: A 16-channel radiofrequency (RF) coil array consisting of eight loop-dipole blocks (16LD) was designed and constructed. Transmit and receive performance was quantitatively investigated in phantom and human model simulations, and experiments on five healthy volunteers inside the prostate...
February 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/26719802/non-invasive-magnetic-resonance-guided-high-intensity-focused-ultrasound-ablation-of-a-vascular-malformation-in-the-lower-extremity-a-case-report
#20
Johanna M M van Breugel, Robbert J Nijenhuis, Mario G Ries, Raechel J Toorop, Evert-Jan P A Vonken, Joost W Wijlemans, Maurice A A J van den Bosch
INTRODUCTION: Therapy of choice for symptomatic vascular malformations consists of surgery, sclerotherapy, or embolization. However, these techniques are invasive with possible complications and require hospitalization. We present a novel non-invasive technique, i.e., magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) ablation, for the treatment of a vascular malformation in a patient. This technique applies high-intensity sound waves transcutaneously to the body and is fully non-invasive...
2015: Journal of Therapeutic Ultrasound
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