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https://www.readbyqxmd.com/read/28230009/effect-of-heat-sink-on-the-recurrence-of-small-malignant-hepatic-tumors-after-radiofrequency-ablation
#1
Zheng-Yu Lin, Guo-Lin Li, Jin Chen, Zhong-Wu Chen, Yi-Ping Chen, Sun-Zhi Lin
AIMS: The aim of this study was to investigate the effect of heat sink on the recurrence of hepatic malignant tumors <3 cm after percutaneous radiofrequency ablation (RFA). SUBJECTS AND METHODS: This study included 564 hepatic malignant tumors <3 cm in 381 patients. Preoperative images were used to determine whether these tumors were adjacent to vessels, and the diameter of adjacent vessels was measured. RFA was performed computed tomography (CT), magnetic resonance imaging (MRI) and ultrasound (US) guidance, and postoperative imaging follow-up was then conducted...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28228308/systematic-review-of-non-invasive-cardiovascular-imaging-in-the-diagnosis-of-constrictive-pericarditis
#2
Sivakumar Ardhanari, Bharath Yarlagadda, Vishal Parikh, Kevin C Dellsperger, Anand Chockalingam, Sudarshan Balla, Senthil Kumar
BACKGROUND: Diagnosis of constrictive pericarditis (CP) can be challenging. It can be nearly impossible to distinguish CP from other causes of right heart failure. Although various imaging modalities help in the diagnosis, no test is definitive. Several reviews have addressed the role of various imaging techniques in the diagnosis of CP but a systematic review has not yet been published. OBJECTIVE: Our intention was to study the ability of various non-invasive imaging modalities to diagnose CP in patients with surgically confirmed disease and to apply our findings to develop a clinically useful diagnostic algorithm...
January 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28227689/robotic-system-with-multiplex-power-transmission-for-mri-guided-percutaneous-interventions
#3
Yang Wang, Sungmin Kim, Everette C Burdette, Peter Kazanzides, Iulian Iordachita, Yang Wang, Sungmin Kim, Everette C Burdette, Peter Kazanzides, Iulian Iordachita, Sungmin Kim, Peter Kazanzides, Everette C Burdette, Iulian Iordachita, Yang Wang
In minimally invasive prostate percutaneous interventions, Magnetic Resonance Imaging (MRI) compatible robotic assistive systems developed over the years tend to have multiple degrees of freedom (DOF) to accomplish complex surgical tasks. This paper presents a novel design of an MRI-compatible transmission that allows one driving motor to control a multiplexed DOF robot system. The transmission could reduce the number of motors in the system, while maintaining the functionality of the system, by controlling each motion sequentially rather than simultaneously...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227662/towards-synergistic-control-of-hands-on-needle-insertion-with-automated-needle-steering-for-mri-guided-prostate-interventions
#4
Marek Wartenberg, Niravkumar Patel, Gang Li, Gregory S Fischer, Marek Wartenberg, Niravkumar Patel, Gang Li, Gregory S Fischer, Niravkumar Patel, Marek Wartenberg, Gregory S Fischer, Gang Li
A significant hurdle of accurate needle tip placement in percutaneous needle-based prostate interventions is unmodeled needle deflection and tissue deformation during insertion. This paper introduces a robotic platform for developing synergistic, cooperatively controlled needle insertion algorithms decoupled from closed-loop image-guided needle steering. Shared control of the surgical workspace through human-robot synergy creates a balance between the accuracy of robotic autonomy while still providing ultimate control of the procedure to the physician...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227396/supervised-multimodal-fusion-and-its-application-in-searching-joint-neuromarkers-of-working-memory-deficits-in-schizophrenia
#5
Shile Qi, Vince D Calhoun, Theo G M van Erp, Eswar Damaraju, Juan Bustillo, Yuhui Du, Jessica A Turner, Daniel H Mathalon, Judith M Ford, James Voyvodic, Bryon A Mueller, Aysenil Belger, Sarah Mc Ewen, Steven G Potkin, Adrian Preda, F Birn, Tianzi Jiang, Jing Sui, Shile Qi, Vince D Calhoun, Theo G M van Erp, Eswar Damaraju, Juan Bustillo, Yuhui Du, Jessica A Turner, Daniel H Mathalon, Judith M Ford, James Voyvodic, Bryon A Mueller, Aysenil Belger, Sarah McEwen, Steven G Potkin, Adrian Preda, F Birn, Tianzi Jiang, Jing Sui
Multimodal fusion is an effective approach to better understand brain disease. To date, most current fusion approaches are unsupervised; there is need for a multivariate method that can adopt prior information to guide multimodal fusion. Here we proposed a novel supervised fusion model, called "MCCAR+jICA", which enables both identification of multimodal co-alterations and linking the covarying brain regions with a specific reference signal, e.g., cognitive scores. The proposed method has been validated on both simulated and real human brain data...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227389/a-method-to-project-clinical-outcome-topographies-onto-preoperative-mri-to-guide-direct-dbs-targeting
#6
Mahesh B Shenai, Barton L Guthrie, Mahesh B Shenai, Barton L Guthrie, Barton L Guthrie, Mahesh B Shenai
The use of intraoperative MR and direct DBS targeting, relies on anatomical rather than functional data. Historical clinical outcome databases that have recorded stimulation location and magnitude of effect, can provide a useful adjunct in DBS targeting strategies. We present a method for generating clinical outcome topographies, and merging regions of effect onto a pre-operative MR, for surgical planning. The clinical outcome topographies are consistent with more intuitive strategies used by neurosurgeons...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227232/itk-snap-an-interactive-tool-for-semi-automatic-segmentation-of-multi-modality-biomedical-images
#7
Paul A Yushkevich, Yang Gao, Guido Gerig, Paul A Yushkevich, Yang Gao, Guido Gerig, Yang Gao, Paul A Yushkevich, Guido Gerig
Obtaining quantitative measures from biomedical images often requires segmentation, i.e., finding and outlining the structures of interest. Multi-modality imaging datasets, in which multiple imaging measures are available at each spatial location, are increasingly common, particularly in MRI. In applications where fully automatic segmentation algorithms are unavailable or fail to perform at desired levels of accuracy, semi-automatic segmentation can be a time-saving alternative to manual segmentation, allowing the human expert to guide segmentation, while minimizing the effort expended by the expert on repetitive tasks that can be automated...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226730/rf-induced-energy-for-partially-implanted-catheters-a-computational-study
#8
Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Leonardo M Angelone, Tom Lloyd, Steve Wedan, Francesca Apollonio, Wolfgang Kainz, Micaela Liberti
Magnetic Resonance Imaging (MRI) is a radiological imaging technique widely used in clinical practice. MRI has been proposed to guide the catheters for interventional procedures, such as cardiac ablation. However, there are risks associated with this procedure, such as RF-induced heating of tissue near the catheters. The aim of this study is to develop a quantitative RF-safety method for patients with partially implanted leads at 64 MHz. RF-induced heating is related to the electric field incident along the catheter, which in turns depends on several variables, including the position of the RF feeding sources and the orientation of the polarization, which are however often unknown...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226729/passive-artifact-behavior-prediction-of-interventional-tools-in-high-field-mri-using-a-0-55t-portable-benchtop-mr-scanner
#9
H Abadi, J Krug, A Illanes, M Friebe, H Abadi, J Krug, A Illanes, M Friebe, J Krug, M Friebe, A Illanes, H Abadi
Using magnetic resonance imaging (MRI) for guiding minimally invasive interventions requires surgical devices which on one hand are visible in the MR image but on the other hand do not generate large artifacts, which distort the overall imaging process. Passive markers are one way to visualize devices such as catheters or biopsy needles in MRI. The evaluation of newly developed passive markers usually requires access to high-field MRI scanners (1.5 T and 3 T). This makes the practical evaluation time-consuming and expensive...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225639/cost-effectiveness-comparison-of-imaging-guided-prostate-biopsy-techniques-systematic-transrectal-ultrasound-direct-in-bore-mri-and-image-fusion
#10
Wulphert Venderink, Tim M Govers, Maarten de Rooij, Jurgen J Fütterer, J P Michiel Sedelaar
OBJECTIVE: Three commonly used prostate biopsy approaches are systematic transrectal ultrasound guided, direct in-bore MRI guided, and image fusion guided. The aim of this study was to calculate which strategy is most cost-effective. MATERIALS AND METHODS: A decision tree and Markov model were developed to compare cost-effectiveness. Literature review and expert opinion were used as input. A strategy was deemed cost-effective if the costs of gaining one quality-adjusted life year (incremental cost-effectiveness ratio) did not exceed the willingness-to-pay threshold of €80,000 (≈$85,000 in January 2017)...
February 22, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28225581/effect-of-sonication-duration-and-power-on-ablation-depth-during-mr-guided-focused-ultrasound-of-bone
#11
Matthew D Bucknor, Eugene Ozhinsky, Rutwik Shah, Roland Krug, Viola Rieke
PURPOSE: To evaluate the effect of differences in sonication duration and power on the size of postcontrast ablation zone following magnetic resonance-guided focused ultrasound (MRgFUS) of bone in a swine femoral bone model. MATERIALS AND METHODS: Experimental procedures received approval from the Institutional Committee on Animal Research. MRgFUS was used to create two thermal lesions in the left femur of six pigs. Each target was subjected to six sonications. 400J of energy was used for each sonication...
February 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28225568/liver-histology-and-diffusion-weighted-mri-in-children-with-nonalcoholic-fatty-liver-disease-a-magnet-study
#12
Paul Manning, Paul Murphy, Kang Wang, Jonathan Hooker, Tanya Wolfson, Michael S Middleton, Kimberly P Newton, Cynthia Behling, Hannah I Awai, Janis Durelle, Melissa N Paiz, Jorge E Angeles, Diana De La Pena, J Allen McCutchan, Jeffrey B Schwimmer, Claude B Sirlin
PURPOSE: To determine potential associations between histologic features of pediatric nonalcoholic fatty liver disease (NAFLD) and estimated quantitative magnetic resonance diffusion-weighted imaging (DWI) parameters. MATERIALS AND METHODS: This prospective, cross-sectional study was performed as part of the Magnetic Resonance Assessment Guiding NAFLD Evaluation and Treatment (MAGNET) ancillary study to the Nonalcoholic Steatohepatitis Clinical Research Network (NASH CRN)...
February 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28221151/-techniques-for-percutaneous-access-during-percutaneous-nephrolithotomy
#13
Daniel Pérez-Fentes
The creation of the access is one of the main steps in percutaneous nephrolithotomy, the most complicated for many urologists and the one that limited most the universalization of the technique. From a purely technical point of view, it includes puncture of the excretory tract and dilatation of the percutaneous tract to end with the introduction of an Amplatz type working sheath. The objective of the puncture is to try to access the excretory system through the renal papilla, minimizing the risk of bleeding...
January 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28220802/the-prostate-cancer-prevention-trial-risk-calculator-2-0-performs-equally-for-standard-biopsy-and-mri-us-fusion-guided-biopsy
#14
M Maruf, M Fascelli, A K George, M M Siddiqui, M Kongnyuy, J M DiBianco, A Muthigi, S Valayil, A Sidana, T P Frye, A Kilchevsky, P L Choyke, B Turkbey, B J Wood, P A Pinto
BACKGROUND: The Prostate Cancer Prevention Trial Risk Calculator 2.0 (PCPTRC) is a widely used risk-based calculator used to assess a man's risk of prostate cancer (PCa) before biopsy. This risk calculator was created from data of a patient cohort undergoing a 6-core sextant biopsy, and subsequently validated in men undergoing 12-core systematic biopsy (SBx). The accuracy of the PCPTRC has not been studied in patients undergoing magnetic resonance imaging/ultrasound (MRI/US) fusion-guided biopsy (FBx)...
February 21, 2017: Prostate Cancer and Prostatic Diseases
https://www.readbyqxmd.com/read/28220524/language-fmri-and-direct-cortical-stimulation-in-epilepsy-preoperative-planning
#15
Alison Austermuehle, John Cocjin, Reynolds Richard, Shubhi Agrawal, Leigh Sepeta, William D Gaillard, Kareem Zaghloul, Sara Inati, William H Theodore
OBJECTIVE: Presurgical language assessment can help minimize damage to eloquent cortex during resective epilepsy surgery. Two methods for presurgical language mapping are functional MRI (fMRI) and direct cortical stimulation (DCS) of implanted subdural electrodes. We compared fMRI results to DCS to help optimize non-invasive language localization and assess its validity. METHODS: We studied 19 patients referred for presurgical evaluation of drug-resistant epilepsy...
February 21, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28220262/imaging-pancreatic-cysts-with-ct-and-mri
#16
REVIEW
R Brooke Jeffrey
CT and MRI are the imaging modalities of choice to guide the clinical management of incidentally discovered pancreatic cysts. Most of these lesions are mucinous cysts with varying degrees of malignant potential. This article reviews the CT and MRI findings that help differentiate a potentially aggressive lesion that requires EUS or surgery from a lesion of low malignant potential that is appropriate for imaging surveillance. The imaging-based societal guidelines for these cysts are reviewed.
February 20, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28217389/management-of-parturients-in-active-labor-with-arnold-chiari-malformation-tonsillar-herniation-and-syringomyelia
#17
Ramsis F Ghaly, Tatiana Tverdohleb, Kenneth D Candido, Nebojsa Nick Knezevic
BACKGROUND: Arnold-Chiari malformation Type 1 (ACM-1) in parturients is a topic of ongoing discussion between obstetricians and anesthesiologists. The primary unanswered question remains; How should the anesthesia provider proceed with labor analgesia and anesthesia for cesarean section when confronted with an advanced, asymptomatic, or minimally symptomatic case of ACM-1 during labor? CASE DESCRIPTION: A 24-year-old, ASA II, G1P0 full-term parturient presented to Labor and Delivery for vaginal delivery...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28217237/-caught-by-the-eye-of-sound-epigastric-swelling-due-to-xiphisternal-tuberculosis
#18
Shabnam Bhandari Grover, Sumit Arora, Amit Kumar, Hemal Grover, Amit Katyan, Deepthi Mohan Nair
BACKGROUND: Common causes of an epigastric mass include hepatomegaly, pancreatic pseudocyst and epigastric hernia, less common causes being carcinoma of the stomach or pancreas, whereas diseases of the sternum presenting as an epigastric swelling is extremely uncommon. We report a case of tubercular infection of the sternum located in the xiphoid process resulting in its presentation as an epigastric swelling. CASE REPORT: A 30-year-old immunocompetent woman with complaints of an epigastric swelling and undocumented pyrexia for four months was referred for sonographic evaluation with a clinical suspicion of an incompletely treated liver abscess...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28216939/prostatic-intraepithelial-neoplasia-like-ductal-prostatic-adenocarcinoma-a-case-suitable-for-active-surveillance
#19
Soroush Rais-Bahrami, Melissa R Dillard, Grace G Zhu, Jennifer B Gordetsky
In contrast to typical prostatic ductal adenocarcinoma, prostatic intraepithelial neoplasia (PIN)-like ductal adenocarcinoma is a rare variant of prostate cancer with low-grade clinical behavior. We report a case of a 66-year-old African-American male with an elevated serum prostate-specific antigen who underwent multiparametric prostate magnetic resonance imaging (MRI) and MRI/ultrasound fusion-guided biopsies. Pathology demonstrated low-volume Gleason score 3 + 3 = 6 (Grade Group 1), acinar adenocarcinoma involving one core and PIN-like ductal adenocarcinoma on a separate core...
January 2017: Urology Annals
https://www.readbyqxmd.com/read/28215513/combined-hepatectomy-and-hepatic-pedicle-lymphadenectomy-in-colorectal-liver-metastases-is-justified
#20
Russell Hodgson, Harsheet Sethi, Andrew H Ling, Peter Lodge
BACKGROUND: The aim of this study was to describe the outcome of patients with colorectal liver metastases (CRLM) and radiological or clinical evidence of metastatic hepatic lymph node involvement who underwent combined hepatectomy and hepatic pedicle lymphadenectomy. METHODS: Retrospective analysis of a prospectively maintained audit of 2082 patients undergoing liver resection for CRLM between 1994 and 2014. Age, type of resection, CT/MRI/PET detection, location, disease recurrence and survival were analysed...
February 15, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
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