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MR Guided

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https://www.readbyqxmd.com/read/28813234/cardiac-mr-strain-a-noninvasive-biomarker-of-fibrofatty-remodeling-of-the-left-atrial-myocardium
#1
Adrian T Huber, Jérôme Lamy, Amer Rahhal, Morgane Evin, Fabrice Atassi, Carine Defrance, Guillaume Lebreton, Karine Clément, Myriam Berthet, Richard Isnard, Pascal Leprince, Philippe Cluzel, Stéphane N Hatem, Nadjia Kachenoura, Alban Redheuil
Purpose To determine whether left atrial (LA) strain quantification with cardiac magnetic resonance (MR) imaging feature tracking is associated with the severity of LA fibrofatty myocardial remodeling at histologic analysis. Materials and Methods This prospective case-control study was approved by the institutional review board. LA strain was evaluated with cardiac MR feature tracking between January 2014 and March 2015 in 13 consecutive patients (mean age, 61 years ± 19; nine male) with mitral regurgitation in the 24 hours before mitral valve surgery and 13 age- and sex-matched healthy control subjects...
August 16, 2017: Radiology
https://www.readbyqxmd.com/read/28812002/image-guided-thermal-ablation-with-mr-based-thermometry
#2
REVIEW
Mingming Zhu, Ziqi Sun, Chin K Ng
Thermal ablation techniques such as radiofrequency, microwave, high intensity focused ultrasound (HIFU) and laser have been used as minimally invasive strategies for the treatment of variety of cancers. MR thermometry methods are readily available for monitoring thermal distribution and deposition in real time, leading to decrease of incidents of normal tissue damage around targeted lesion. HIFU and laser-induced thermal therapy (LITT) are the two widely accepted tumor ablation techniques because of their compatibility with MR systems...
June 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28811038/fast-and-robust-online-adaptive-planning-in-stereotactic-mr-guided-adaptive-radiation-therapy-smart-for-pancreatic-cancer
#3
O Bohoudi, A M E Bruynzeel, S Senan, J P Cuijpers, B J Slotman, F J Lagerwaard, M A Palacios
BACKGROUND AND PURPOSE: To implement a robust and fast stereotactic MR-guided adaptive radiation therapy (SMART) online strategy in locally advanced pancreatic cancer (LAPC). MATERIAL AND METHODS: SMART strategy for plan adaptation was implemented with the MRIdian system (ViewRay Inc.). At each fraction, OAR (re-)contouring is done within a distance of 3cm from the PTV surface. Online plan re-optimization is based on robust prediction of OAR dose and optimization objectives, obtained by building an artificial neural network (ANN)...
August 12, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28803217/accurate-model-based-segmentation-of-gynecologic-brachytherapy-catheter-collections-in-mri-images
#4
Andre Mastmeyer, Guillaume Pernelle, Ruibin Ma, Lauren Barber, Tina Kapur
The gynecological cancer mortality rate, including cervical, ovarian, vaginal and vulvar cancers, is more than 20,000 annually in the US alone. In many countries, including the US, external-beam radiotherapy followed by high dose rate brachytherapy is the standard-of-care. The superior ability of MR to visualize soft tissue has led to an increase in its usage in planning and delivering brachytherapy treatment. A technical challenge associated with the use of MRI imaging for brachytherapy, in contrast to that of CT imaging, is the visualization of catheters that are used to place radiation sources into cancerous tissue...
July 18, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28801025/toward-an-mri-based-nomogram-for-the-prediction-of-transperineal-prostate-biopsy-outcome-a-physician-and-patient-decision-tool
#5
Su-Min Lee, Sidath H Liyanage, Wahyu Wulaningsih, Konrad Wolfe, Thomas Carr, Choudhry Younis, Mieke Van Hemelrijck, Rick Popert, Peter Acher
PURPOSE: To develop and internally validate a nomogram using biparametric magnetic resonance imaging (B-MRI)-derived variables for the prediction of prostate cancer at transperineal sector-guided prostate biopsy (TPSB). SUBJECTS/PATIENTS AND METHODS: Consecutive patients referred to our institution with raised prostate-specific antigen (PSA), abnormal prostate examination, or persistent suspicion of prostate cancer after previous transrectal biopsy between July 2012 and November 2015 were reviewed from a prospective database...
August 8, 2017: Urologic Oncology
https://www.readbyqxmd.com/read/28799842/midterm-safety-and-efficacy-of-irreversible-electroporation-of-malignant-liver-tumors-located-close-to-major-portal-or-hepatic-veins
#6
Martina Distelmaier, Alexandra Barabasch, Philipp Heil, Nils A Kraemer, Peter Isfort, Sebastian Keil, Christiane K Kuhl, Philipp Bruners
Purpose To investigate the efficacy and safety of irreversible electroporation (IRE) in the treatment of hepatic tumors not suitable for thermal ablation (radiofrequency ablation [RFA] or microwave ablation). Materials and Methods This was an institutional review board-approved prospective study in 29 patients (15 men, 14 women; mean age, 63 years ± 12 [standard deviation]) with 43 primary (n = 8) or secondary (n = 35) malignant liver tumors who underwent computed tomography (CT)-guided IRE. All target tumors were located immediately adjacent to major hepatic veins, portal veins, or both; thus, they were not considered suitable for RFA or microwave ablation...
August 11, 2017: Radiology
https://www.readbyqxmd.com/read/28799840/standardized-method-for-the-measurement-of-grabb-s-line-and-clival-canal-angle
#7
Jonathan E Martin, Markus Bookland, Douglas Moote, Catherine Cebulla
OBJECTIVE Grabb's line-the perpendicular distance from the basion-C2 line (pB-C2)-is a widely used radiographic measurement with significant clinical implications in patients with a complex Chiari malformation. Rigorous demonstration of the reproducibility of this measurement has not previously been reported. The authors report a standardized measurement technique with excellent inter- and intrarater reliability on T1-weighted sagittal MRI. METHODS The authors developed a standardized measurement technique that included specifications of midline slice selection, landmark and reference line definitions, and measurement technique on T1-weighted sagittal images...
August 11, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28795419/simultaneous-mr-thermometry-and-acoustic-radiation-force-imaging-using-interleaved-acquisition
#8
Joshua T de Bever, Henrik Odéen, Lorne W Hofstetter, Dennis L Parker
PURPOSE: A novel and practical method for simultaneously performing MR acoustic radiation force imaging (ARFI) and proton resonance frequency (PRF)-shift thermometry has been developed and tested. This could be an important tool for evaluating the success of MR-guided focused ultrasound procedures for which MR-thermometry measures temperature and thermal dose and MR-ARFI detects changes in tissue mechanical properties. METHODS: MR imaging was performed using a gradient recalled echo segmented echo-planar imaging pulse sequence with bipolar motion encoding gradients (MEG)...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28781881/early-health-technology-assessment-of-magnetic-resonance-guided-high-intensity-focused-ultrasound-ablation-for-the-treatment-of-early-stage-breast-cancer
#9
Floortje M Knuttel, Sèvrin E M Huijsse, Talitha L Feenstra, Chrit T W Moonen, Maurice A A J van den Bosch, Erik Buskens, Marcel J W Greuter, Geertruida H de Bock
BACKGROUND: Magnetic resonance-guided high intensity focused ultrasound (MR-HIFU) ablation is in development for minimally invasive treatment of breast cancer. Cost-effectiveness has not been assessed yet. An early health technology assessment was performed to estimate costs of MR-HIFU ablation, compared to breast conserving treatment (BCT). METHODS: An MR-HIFU treatment model using the dedicated MR-HIFU breast system (Sonalleve, Philips Healthcare) was developed...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28780044/from-interventionist-imaging-to-intraoperative-guidance-new-perspectives-by-combining-advanced-tools-and-navigation-with-radio-guided-surgery
#10
S Vidal-Sicart, R Valdés Olmos, O E Nieweg, R Faccini, M R Grootendorst, H J Wester, N Navab, B Vojnovic, H van der Poel, S Martínez-Román, J Klode, F Wawroschek, F W B van Leeuwen
The integration of medical imaging technologies into diagnostic and therapeutic approaches can provide a preoperative insight into both anatomical (e.g. using computed tomography (CT), magnetic resonance (MR) imaging, or ultrasound (US)), as well as functional aspects (e.g. using single photon emission computed tomography (SPECT), positron emission tomography (PET), lymphoscintigraphy, or optical imaging). Moreover, some imaging modalities are also used in an interventional setting (e.g. CT, US, gamma or optical imaging) where they provide the surgeon with real-time information during the procedure...
August 3, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28777164/mr-imaging-of-mediastinal-masses
#11
Brett W Carter, Sonia L Betancourt, Marcelo F Benveniste
The mediastinum contains vital vascular and nonvascular structures and organs, and a wide variety of abnormalities may arise from this region of the thorax. Although mediastinal masses may be initially detected on chest radiography, cross-sectional imaging plays an important role in the identification and evaluation of mediastinal lesions, enabling the formulation of focused differential diagnoses and ultimately guiding management. Computed tomography (CT) is considered the imaging modality of choice for evaluating most mediastinal masses; however, the role of magnetic resonance (MR) imaging continues to expand, as it is superior to CT in differentiating between cystic and solid masses, identifying cystic and solid components within complex lesions, and distinguishing thymic hyperplasia and normal thymus from thymic epithelial neoplasms and other neoplasms...
August 2017: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/28774449/imaging-of-juvenile-idiopathic-arthritis
#12
REVIEW
Dimitriou Christos, Boitsios Grammatina, Phu-Quoc Lê, Laurence Goffin, Badot Valérie, Paolo Simoni
Juvenile idiopathic arthritis is an umbrella term covering several distinct categories that share common features. The European League Against Rheumatism and the Pediatric Rheumatology European Society have published a consensus article with recommendations to guide radiologists and clinicians in choosing the best imaging technique for each particular clinical setting. A reproducible, accurate, validated, and long-established scoring system to use in everyday practice for monitoring and predicting long-term response to therapy is still to be developed on MR imaging for each joint...
September 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28771144/effect-of-intra-fraction-motion-on-the-accumulated-dose-for-free-breathing-mr-guided-stereotactic-body-radiation-therapy-of-renal-cell-carcinoma
#13
Bjorn Stemkens, Markus Glitzner, Charis Kontaxis, Baudouin Denis de Senneville, Fieke M Prins, Sjoerd P M Crijns, Linda G W Kerkmeijer, Jan J W Lagendijk, Cornelis A T Van den Berg, Rob H N Tijssen
Stereotactic body radiation therapy (SBRT) has shown great promise in increasing local control rates for renal-cell carcinoma (RCC). Characterized by steep dose gradients and high fraction doses, these hypo-fractionated treatments are, however, prone to dosimetric errors as a result of variations in intra-fraction respiratory-induced motion, such as drifts and amplitude alterations. This may lead to significant variations in the deposited dose. This study aims to develop a method for calculating the accumulated dose for MRI-guided SBRT of RCC in the presence of intra-fraction respiratory variations and determine the effect of such variations on the deposited dose...
August 3, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28770920/injectable-thermosensitive-magnetic-nanoemulsion-hydrogel-for-multimodal-imaging-guided-accurate-thermoablative-cancer-therapy
#14
Haoan Wu, Lina Song, Ling Chen, Yixin Huang, Yang Wu, Fengchao Zang, Yanli An, Hanbai Lyu, Ming Ma, Jun Chen, Ning Gu, Yu Zhang
Ferrofluid-based magnetic hyperthermia of cancers has gained significant attention in recent years due to its excellent efficacy, few deleterious side effects and unlimited tissue penetration capacity. However, the high tumor osmotic pressure causes injection leakage and thus position imprecision because of the fluidity of the ferrofluid and the absence of multimodal imaging guidance, which create tremendous challenges for clinical application. Here, a body temperature-induced gelation strategy is constructed for accurate localized magnetic tumor regression based on the unique behaviors of a magnetic nanoemulsion hydrogel (MNH) within tumors...
August 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28770356/radial-mri-with-variable-echo-times-reducing-the-orientation-dependency-of-susceptibility-artifacts-of-an-mr-safe-guidewire
#15
Katharina E Schleicher, Michael Bock, Klaus Düring, Stefan Kroboth, Axel J Krafft
OBJECTIVES: Guidewires are indispensable tools for intravascular MR-guided interventions. Recently, an MR-safe guidewire made from a glass-fiber/epoxy compound material with embedded iron particles was developed. The size of the induced susceptibility artifact, and thus the guidewire's visibility, depends on its orientation against B 0. We present a radial acquisition scheme with variable echo times that aims to reduce the artifact's orientation dependency. MATERIALS AND METHODS: The radial acquisition scheme uses sine-squared modulated echo times depending on the physical direction of the spoke to balance the susceptibility artifact of the guidewire...
August 2, 2017: Magma
https://www.readbyqxmd.com/read/28769128/mr-guided-focused-ultrasound-in-fibroid-treatment-results-of-the-3rd-radiological-gynecological-expert-meeting
#16
Matthias David, Matthias Matzko
No abstract text is available yet for this article.
June 2017: Geburtshilfe und Frauenheilkunde
https://www.readbyqxmd.com/read/28764881/dosimetric-impact-of-intrafraction-changes-in-mr-guided-high-dose-rate-hdr-brachytherapy-for-prostate-cancer
#17
Alexandra Rink, Jette Borg, Anna Simeonov, Gerald O'Leary, Joelle Helou, Cynthia Ménard, Peter Chung, David A Jaffray, Alejandro Berlin
PURPOSE: To assess changes in implant and treatment volumes through the course of a prostate high-dose-rate brachytherapy procedure and their impact on plan quality metrics. METHODS AND MATERIALS: Sixteen MRI-guided high-dose-rate procedures included a post-treatment MR (ptMR) immediately after treatment delivery (135 min between MR scans). Target and organs at risk (OARs) were contoured, and catheters were reconstructed. The delivered treatment plan was applied to the ptMR image set...
July 29, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28757402/brachytherapy-patient-safety-events-in-an-academic-radiation-medicine%C3%A2-program
#18
Shira Felder, Lyndon Morley, Elizabeth Ng, Kitty Chan, Heather Ballantyne, Anne Di Tomasso, Jette Borg, Jean-Pierre Bissonnette, Stephen Breen, John Waldron, Alexandra Rink, Michael Milosevic
PURPOSE: To describe the incidence and type of brachytherapy patient safety events over 10 years in an academic brachytherapy program. METHODS AND MATERIALS: Brachytherapy patient safety events reported between January 2007 and August 2016 were retrieved from the incident reporting system and reclassified using the recently developed National System for Incident Reporting in Radiation Treatment taxonomy. A multi-incident analysis was conducted to identify common themes and key learning points...
July 27, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28757357/erectile-dysfunction-following-pelvic-fracture-urethral-injury
#19
REVIEW
Niels V Johnsen, Melissa R Kaufman, Roger R Dmochowski, Douglas F Milam
INTRODUCTION: Although pelvic fracture urethral injuries (PFUIs) are rare, approximately half these patients will report erectile dysfunction (ED) after their injuries. The anatomic relations of the cavernosal nerves and arteries to the bones of the pelvis and the urethra put these structures at significant risk at the time of PFUI. This review examines the epidemiology, evaluation, and management of ED in this patient population. AIM: To evaluate the epidemiology, pathophysiology, diagnosis, and management of patients with ED after PFUI...
July 27, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28749167/diagnostic-value-of-semiquantitative-and-quantitative-analysis-of-functional-parameters-in-multiparametric-mri-of-the-prostate
#20
Elke Hauth, Daniela Halbritter, Horst Jaeger, Horst Hohmuth, Meinrad Beer
OBJECTIVES: To determine the diagnostic value of semiquantitative and quantitative parameters of three functional techniques in multiparametric (mp)-MRI of the prostate. METHODS: Mp-MRI was performed in 110 patients with suspicion of prostate cancer (PCA) before TRUS-guided core biopsy. Peak-enhancement, initial and post-initial enhancement, iAUGC (initial area under gadolinium curve), Ktrans (forward rate constant), Kep (efflux rate constant), Ve (extracellular volume), ADC (apparent diffusion coefficient), and MR spectroscopy ratio were obtained for malignant and benign lesions...
July 27, 2017: British Journal of Radiology
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