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https://www.readbyqxmd.com/read/28782985/pathologic-findings-of-breast-lesions-detected-on-magnetic-resonance-imaging
#1
Seema B Jabbar, Beverly Lynch, Stephen Seiler, Helena Hwang, Sunati Sahoo
CONTEXT: - Breast magnetic resonance imaging (MRI) is now used routinely for high-risk screening and in the evaluation of the extent of disease in newly diagnosed breast cancer patients. Morphologic characteristics and the kinetic pattern largely determine how suspicious a breast lesion is on MRI. Because of its high sensitivity, MRI identifies a large number of suspicious lesions. However, the low to moderate specificity and the additional cost have raised questions regarding its frequent use...
August 7, 2017: Archives of Pathology & Laboratory Medicine
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
#2
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/28764881/dosimetric-impact-of-intrafraction-changes-in-mr-guided-high-dose-rate-hdr-brachytherapy-for-prostate-cancer
#3
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/28761393/a-combined-intravascular-mri-endoscope-and-intravascular-ultrasound-ivus-transducer-for-high-resolution-image-guided-ablation
#4
Xiaoyang Liu, Nicholas Ellens, Emery Williams, Everette Clif Burdette, Parag Karmarkar, Paul Bottomley
An intravascular MRI (IMRI) loopless antenna is combined for the first time with an intravascular water-cooled ultrasound ablation transducer as a possible tool for providing high-resolution MRI-guided ablations of pathological tissue via intravascular access. High resolution anatomical MRI, and real-time MRI thermometry were used to monitor ablation delivery in phantoms and tissue specimens. Results show that IMRI can guide IVUS-mediated directional ablation with minimal image artifacts. This permits the monitoring of thermal dose and therapy titration while minimizing potential thermal damage to the vessel wall...
April 2017: Proceedings of the International Society for Magnetic Resonance in Medicine ... Scientific Meeting and Exhibition
https://www.readbyqxmd.com/read/28757404/intermediate-dose-volume-parameters-and-the-development-of-late-rectal-toxicity-after-mri-guided-brachytherapy-for-locally-advanced-cervix-cancer
#5
Reem Ujaimi, Michael Milosevic, Anthony Fyles, Akbar Beiki-Ardakani, Marco Carlone, Haiyan Jiang, Patricia Lindsay, Jason Xie, Rachel Gerber, Jennifer Croke, Julia Skliarenko, Wilfred Levin, Kathy Han
PURPOSE: The dose delivered to the most exposed 2 cm(3) [Formula: see text] of the rectum and bladder is predictive of late rectal and bladder toxicity in cervix cancer patients. We investigated the predictive value of intermediate doses to the rectum and bladder for late rectal/bladder toxicity after MRI-guided brachytherapy for patients with locally advanced cervix cancer. METHODS AND MATERIALS: Toxicity was prospectively graded using Common Toxicity Criteria for Adverse Events v4...
July 27, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28754486/what-is-the-yield-of-breast-mri-in-the-assessment-of-palpable-breast-findings
#6
Y Amitai, T S Menes, I Weinstein, A Filyavich, I Yakobson, O Golan
AIM: To examine the contribution of magnetic resonance imaging (MRI) to characterise palpable breast masses after conventional imaging was found to be non-contributory. MATERIALS AND METHODS: The breast MRI database was reviewed for studies performed between January 2010 and December 2015 for the clinical indication of palpable breast finding with negative standard imaging. Medical files were reviewed for demographic data, clinical information, radiology, and pathology reports...
July 25, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28749035/comparison-between-target-mri-in-gantry-and-cognitive-target-transperineal-or-transrectal-guided-prostate-biopsies-for-pirads-3-5-mri-lesions
#7
A J Yaxley, J W Yaxley, I Thangasamy, E Ballard, M Pokorny
OBJECTIVE: To compare the detection rates of prostate cancer in men with PIRADS 3-5 abnormalities on 3T mpMRI using in-bore MRI guided biopsy (MRGB) compared to cognitively directed transperineal biopsy (cTP) and transrectal (cTRUS). METHODS: This is a retrospective single centre study of consecutive men attending the private practice clinic of an experienced urologist performing MRGB and an experienced urologist performing cTP and cTRUS biopsy techniques for PIRADS 3-5 lesions identified on 3T mpMRI...
July 27, 2017: BJU International
https://www.readbyqxmd.com/read/28747452/mri-guided-focused-ultrasound-thalamotomy-in-non-et-tremor-syndromes
#8
Alfonso Fasano, Maheleth Llinas, Renato P Munhoz, Eugen Hlasny, Walter Kucharczyk, Andres M Lozano
OBJECTIVE: To report the 6-month single-blinded results of unilateral thalamotomy with MRI-guided focused ultrasound (MRgFUS) in patients with tremors other than essential tremor. METHODS: Three patients with tremor due to Parkinson disease, 2 with dystonic tremor in the context of cervicobrachial dystonia and writer's cramp, and 1 with dystonia gene-associated tremor underwent MRgFUS targeting the ventro-intermedius nucleus (Vim) of the dominant hemisphere. The primary endpoint was the reduction of lateralized items of the Tremor Rating Scale of contralateral hemibody assessed by a blinded rater...
July 26, 2017: Neurology
https://www.readbyqxmd.com/read/28747132/prostate-cancer-in-bore-magnetic-resonance-guided-biopsies-at-active-surveillance-inclusion-improve-selection-of-patients-for-active-treatment
#9
Maria Carlsen Elkjær, Morten Heebøll Andersen, Søren Høyer, Bodil Ginnerup Pedersen, Michael Borre
Background Active surveillance (AS) of low-risk prostate cancer (PCa) is an accepted alternative to active treatment. However, the conventional diagnostic trans-rectal ultrasound guided biopsies (TRUS-bx) underestimate PCa aggressiveness in almost half of the cases, when compared with the surgical specimen. Purpose To investigate if additional multi-parametric magnetic resonance imaging (mpMRI) of the prostate and MRI-guided in-bore biopsies (MRGB) at AS inclusion would improve selection of patients for active treatment...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28740928/magnetic-resonance-imaging-guided-reirradiation-of-recurrent-and-second-primary-head-and-neck-cancer
#10
Allen M Chen, Minsong Cao, Sophia Hsu, James Lamb, Argin Mikaeilian, Yingli Yang, Nzhde Agazaryan, Daniel A Low, Michael L Steinberg
PURPOSE: To report a single-institutional experience using magnetic resonance imaging (MRI) guided radiation therapy for the reirradiation of recurrent and second cancers of the head and neck. METHODS AND MATERIALS: Between October 2014 and August 2016, 13 consecutive patients with recurrent or new primary cancers of the head and neck that occurred in a previously irradiated field were prospectively enrolled in an institutional registry trial to investigate the feasibility and efficacy of MRI guided radiation therapy using a 0...
April 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28739764/mr-guided-percutaneous-biopsy-of-focal-hepatic-dome-lesions-with-free-hand-combined-with-mr-fluoroscopy-using-1-0-t-open-high-field-scanner
#11
Ligang Wang, Ming Liu, Liming Liu, Yanbo Zheng, Yujun Xu, Xiangmeng He, Peipei Li, Chengli Li
AIM: To prospectively estimate the safety, feasibility and accuracy of 1.0T open-magnetic resonance (MR)-guided percutaneous biopsy in free-hand of focal lesions located in the hepatic dome. MATERIALS AND METHODS: All percutaneous MR-guided biopsies of the lesions were performed at the Shandong Medical Imaging Research Institute. Thirty-six patients with focal liver lesions located in the hepatic dome measuring 6-36 mm in the maximum diameter were included in this study...
August 2017: Anticancer Research
https://www.readbyqxmd.com/read/28736746/malakoplakia-of-the-prostate-as-a-mimicker-of-prostate-cancer-on-prostate-health-index-and-magnetic-resonance-imaging-fusion-prostate-biopsy-a-case-report
#12
Nathaniel H Heah, Teck Wei Tan, Yung Khan Tan
Background: Isolated malakoplakia of the prostate is a rare inflammatory condition that has been clinically mistaken for prostatic malignancies. The development of Prostate Imaging Reporting and Data System (PI-RADS) classifications, and Prostate Health Index (PHI) has led to more accurate diagnosis of clinically significant disease and stratification of patients that may be at risk of prostate cancer. Case Presentation: We present a case of a 75-year-old male who was on follow-up with our hospital for elevated prostate specific antigen (PSA)...
2017: Journal of Endourology Case Reports
https://www.readbyqxmd.com/read/28735018/safety-and-feasibility-of-direct-mri-guided-transperineal-prostate-biopsy-using-a-novel-mri-safe-robotic-device
#13
Mark W Ball, Ashley E Ross, Kamyar Ghabili, Chunwoo Kim, Changhan Jun, Doru Petrisor, Li Pan, Jonathan I Epstein, Katarzyna J Macura, Dan S Stoianovici, Mohamad E Allaf
OBJECTIVE: To evaluate safety and feasibility in a first in human trial of direct MRI-guided prostate biopsy using a novel robotic device. METHODS: MrBot is an MRI-safe robotic device constructed entirely of nonconductive, nonmetallic, and nonmagnetic materials, developed by our group. A safety and feasibility clinical trial was designed to assess the safety and feasibility of direct MRI-guided biopsy with MrBot and determine its targeting accuracy. Men with elevated PSA, prior negative prostate biopsy and cancer suspicious region (CSR) on MRI were enrolled in the study...
July 19, 2017: Urology
https://www.readbyqxmd.com/read/28733357/a-role-for-the-left-angular-gyrus-in-episodic-simulation-and-memory
#14
Preston P Thakral, Kevin P Madore, Daniel L Schacter
Functional magnetic resonance imaging (fMRI) studies indicate that episodic simulation (i.e., imagining specific future experiences) and episodic memory (i.e., remembering specific past experiences) are associated with enhanced activity in a common set of neural regions, referred to as the core network. This network comprises the hippocampus, medial prefrontal cortex, and left angular gyrus, among other regions. Because fMRI data are correlational, it is unknown whether activity increases in core network regions are critical for episodic simulation and episodic memory...
July 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28725589/multi-parametric-magnetic-resonance-imaging-as-a-management-decision-tool
#15
REVIEW
David C Johnson, Robert E Reiter
The ability to image the prostate accurately and better characterize cancerous lesions makes multiparametric magnetic resonance imaging (mpMRI) an invaluable tool to improve management of localized prostate cancer (PCa). Improved risk stratification is warranted given the evidence of significant overtreatment of indolent PCa. mpMRI can more accurately rule out clinically significant PCa in men deciding between surveillance and definitive treatment to reduce overtreatment. mpMRI improves detection of clinically significant PCa, which helps minimize sampling error, a major limitation of the traditional diagnostic paradigm...
June 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28725582/co-registration-of-mri-and-ultrasound-accuracy-of-targeting-based-on-radiology-pathology-correlation
#16
REVIEW
Win Shun Lai, Jessica G Zarzour, Jennifer B Gordetsky, Soroush Rais-Bahrami
We reviewed the role of multiparametric magnetic resonance imaging (MP-MRI) and methods of MRI guided biopsy including in-bore, cognitive fusion, and software-based fusion. MP-MRI has been developed, optimized, and studied as a means of improving prostate cancer detection beyond the standard evaluation that utilizes digital rectal examinations and serum prostate specific antigen (PSA). MP-MRI has been proven to be an excellent diagnostic imaging modality that improves prostate cancer detection and risk stratification by guiding biopsy samples...
June 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28725581/direct-magnetic-resonance-imaging-guided-biopsy-of-the-prostate-lessons-learned-in-establishing-a-regional-referral-center
#17
REVIEW
Benjamin Addicott, Bryan R Foster, Chenara Johnson, Alice Fung, Christopher L Amling, Fergus V Coakley
MRI-targeted biopsy of the prostate appears to have the potential to reduce the high rates of underdiagnosis and overdiagnosis associated with the current diagnostic standard of transrectal ultrasound guided systematic biopsy. Direct or "in bore" MRI-guided biopsy is one of the three methods for MRI-targeted core needle sampling of suspicious, generally Pi-RADS 4 or 5, foci within the prostate, and our early experience suggests the approach demonstrates substantial utility and promise in the care of patients with prostate cancer...
June 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28725578/transperineal-vs-transrectal-biopsy-in-mri-targeting
#18
REVIEW
Jeremy Grummet, Lana Pepdjonovic, Sean Huang, Elliot Anderson, Boris Hadaschik
Prostate biopsy is typically performed via either the transrectal or transperineal approach. MRI-targeted biopsy, whether using any of the three options of cognitive fusion, MRI-ultrasound fusion software, or in-bore MRI-guided biopsy, can also be performed via either transrectal or transperineal approaches. As an extension of traditional random prostate biopsy, the transrectal approach is far more commonly used for MRI-targeted biopsy due to its convenience. However, in the context of today's increasing multi-drug resistance of rectal flora, the transperineal approach is being used more often due to its lack of septic complications...
June 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28719087/mri-guided-stereotactic-neurosurgical-procedures-in-a-diagnostic-mri-suite-background-and-safe-practice-recommendations
#19
Paul S Larson, Jon T Willie, Sudhakar Vadivelu, Hooman Azmi-Ghadimi, Amy Nichols, Loretta Litz Fauerbach, Helen Boehm Johnson, Denise Graham
The development of navigation technology facilitating MRI-guided stereotactic neurosurgery has enabled neurosurgeons to perform a variety of procedures ranging from deep brain stimulation to laser ablation entirely within an intraoperative or diagnostic MRI suite while having real-time visualization of brain anatomy. Prior to this technology, some of these procedures required multisite workflow patterns that presented significant risk to the patient during transport. For those facilities with access to this technology, safe practice guidelines exist only for procedures performed within an intraoperative MRI...
July 2017: Journal of Healthcare Risk Management: the Journal of the American Society for Healthcare Risk Management
https://www.readbyqxmd.com/read/28714565/mri-compatible-breast-rib-phantom-for-evaluating-ultrasonic-thermal-exposures
#20
Georgios Menikou, Marinos Yiannakou, Christos Yiallouras, Cleanthis Ioannides, Christakis Damianou
INTRODUCTION: The target of this study was the development of a magnetic resonance imaging (MRI) compatible breast phantom for focused ultrasound which includes plastic (ABS) ribs. The objective of the current study was the evaluation of a focused ultrasound procedure using the proposed phantom that eliminates rib heating. MATERIAL AND METHODS: The proposed phantom was evaluated using two different focused ultrasound exposures. The surrounding breast tissue was mimicked using an agar-silica-evaporation milk gel (2% w/v - 2% w/v - 40% v/v)...
July 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
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