626,352 results match your criteria imaging mri


Choledochal cyst theories going pear-shaped? Evolution of choledochal cyst during intrauterine life in a case evaluated using magnetic resonance imaging and postnatal outcomes.

J Obstet Gynaecol Res 2021 Sep 27. Epub 2021 Sep 27.

Department of Fetal Medicine, Clínica de Diagnóstico por Imagem (CDPI), Rio de Janeiro, Brazil.

A choledochal cyst is a rare abdominal malformation and was first reported almost three centuries before. There are few theories describing the evolution of the cyst through the lifespan of affected patients until diagnosis and prompt treatment; however, there is no image documentation of the evolution of the malformation. In this report, we demonstrate the evolution of a type I choledochal cyst in a fetus from the 24th to the 37th week of gestation using magnetic resonance imaging and perinatal outcomes with correlation with pathophysiological mechanisms. Read More

View Article and Full-Text PDF
September 2021

Social Relationship Strength Modulates the Similarity of Brain-to-Brain Representations of Group Members.

Cereb Cortex 2021 Sep 27. Epub 2021 Sep 27.

Department of Psychology, University of Oregon, Eugene, OR 97403, USA.

Within our societies, humans form co-operative groups with diverse levels of relationship quality among individual group members. In establishing relationships with others, we use attitudes and beliefs about group members and the group as a whole to establish relationships with particular members of our social networks. However, we have yet to understand how brain responses to group members facilitate relationship quality between pairs of individuals. Read More

View Article and Full-Text PDF
September 2021

A pediatric case of Bartonella henselae and Epstein Barr virus disease with bone and hepatosplenic involvement.

Bol Med Hosp Infant Mex 2021 ;78(5):467-473

Hospital Francisco Grande Covián, Parres. Asturias, Spain.

Background: Cat scratch disease (CSD) is an infectious disorder caused by Bartonella henselae. The infection usually presents as local lymphadenopathy, fever, and mild constitutional symptoms. Systemic or severe disease is reported in 5-20% of patients with CSD. Read More

View Article and Full-Text PDF
January 2021

Autobiographical Script-Driven Imagery Has No Detectable Effect on Emotion Regulation in Healthy Individuals.

Neuropsychobiology 2021 Sep 27:1-8. Epub 2021 Sep 27.

Department of Psychiatry and Neurosciences, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.

Introduction: Emotion regulation (ER), the ability to actively modulate one's own emotion reactions, likely depends on the individual's current emotional state. Here, we investigated whether negative emotions induced by an interpersonal autobiographic script affect the neuronal processes underlying ER.

Methods: Twenty healthy participants were recruited and underwent functional magnetic resonance imaging (fMRI) during performance of distancing, a specific ER strategy, while viewing emotionally arousing pictures. Read More

View Article and Full-Text PDF
September 2021

Minimizing the need for coil attenuation correction in integrated PET/MRI at 1.5 T using low-density MR-linac receive arrays.

Phys Med Biol 2021 Sep 27. Epub 2021 Sep 27.

Department of Radiotherapy, Universitair Medisch Centrum Utrecht, Utrecht, Utrecht, NETHERLANDS.

The simultaneous use of positron emission tomography (PET) and magnetic resonance imaging (MRI) requires attenuation correction (AC) of photon-attenuating objects, such as MRI receive arrays. However, AC of flexible, on-body arrays is complex and therefore often omitted. This can lead to significant, spatially varying, PET signal losses when conventional MRI receive arrays are used. Read More

View Article and Full-Text PDF
September 2021

Noninvasive assessment of clinically significant portal hypertension using ΔT1 of the liver and spleen and ECV of the spleen on routine Gd-EOB-DTPA liver MRI.

Eur J Radiol 2021 Sep 20;144:109958. Epub 2021 Sep 20.

Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern University Hospital, University of Bern, Switzerland. Electronic address:

Purpose: To analyze the predictive value of ΔT1 of the liver and spleen as well as the extracellular volume fraction (ECV) of the spleen as noninvasive biomarkers for the determination of clinically significant portal hypertension (CSPH) on routine Gd-EOB-DTPA liver MRI.

Method: 195 consecutive patients with known or suspected chronic liver disease from 9/2018 to 7/2019 with Gd-EOB-DTPA liver MRI and abdominal T1 mapping were retrospectively included. Based on the presence of splenomegaly with thrombocytopenia, ascites and portosystemic collaterals, the patients were divided into noCSPH (n = 113), compensated CSPH (cCSPH, ≥1 finding without ascites; n = 55) and decompensated CSPH (dCSPH, ascites ± other findings; n = 27). Read More

View Article and Full-Text PDF
September 2021

Total elbow arthroplasty as a reconstruction option for distal humerus osteosarcoma: A case report.

Int J Surg Case Rep 2021 Sep 8;87:106392. Epub 2021 Sep 8.

Department of Orthopaedic and Traumatology, Faculty of Medicine Universitas Indonesia, Persahabatan General Hospital, Indonesia.

Introduction: Osteosarcoma is the second most common malignant bone tumor. The humerus is the third most common anatomical location for osteosarcoma, however, osteosarcoma around the elbow joint is uncommon. The intricacy of the elbow joint, limited soft tissue coverage, and proximity to nerves and arteries make the surgical resection and reconstruction complicated. Read More

View Article and Full-Text PDF
September 2021

Measurement of the facial nerve thickness and its correlation with freezing phenomenon and hypomimia in Parkinson's disease.

Clin Neurol Neurosurg 2021 Sep 22;210:106960. Epub 2021 Sep 22.

Bozok University Medical School, Yozgat, Turkey. Electronic address:

Objective: Hypomimia is one of the diagnostic features in Parkinson's disease, and freezing blocks may also occur with the degenerative process. We investigated that the thickness of the cranial facial nerve that innervates facial expressions, and the relationship between bradymimia and freezing phenomena in these patients.

Methods: We included 70 patients and healthy participants in this cross-sectional study. Read More

View Article and Full-Text PDF
September 2021

Fatty pancreas is independently associated with subsequent diabetes mellitus development: A 10-year prospective cohort study.

Clin Gastroenterol Hepatol 2021 Sep 24. Epub 2021 Sep 24.

Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Hong Kong SAR, China; Institute of Digestive Disease, The Chinese University of Hong Kong, Hong Kong SAR, China. Electronic address:

Background & Aims: While the association between fatty pancreas and metabolic syndrome has been suggested in retrospective studies, long-term prospective data on the effect of fatty pancreas on various metabolic outcomes is lacking. We aimed to prospectively investigate the association between fatty pancreas and development of major metabolic outcomes.

Methods: 631 subjects from a population study using fat-water magnetic resonance imaging to quantify pancreatic and liver fat content during 2008-2010 were prospectively followed until December 2020 (mean follow-up time: 11. Read More

View Article and Full-Text PDF
September 2021

In-Office Needle Arthroscopy for the Treatment of Anterior Ankle Impingement Yields High Patient Satisfaction with High Rates of Return to Work and Sport.

Arthroscopy 2021 Sep 24. Epub 2021 Sep 24.

NYU Langone Health, Department of Orthopaedic Surgery, New York, NY. Electronic address:

Purpose: The purpose of the current study was to evaluate the clinical outcomes of in-office needle arthroscopy (IONA) for the treatment of anterior ankle impingement in the office setting, and also evaluate patient experience of the IONA procedure.

Methods: A prospectively collected database of 31 patients undergoing IONA for the treatment of anterior ankle impingement between January 2019 and January 2021 was retrospectively reviewed. Inclusion criteria for this study was: patients ≥ 18 years of age, clinical history, physical exam, radiographic imaging, and MRI consistent with anterior ankle impingement for which each patient underwent IONA and had a minimum of 12-month follow-up. Read More

View Article and Full-Text PDF
September 2021

Cardiovascular imaging in pregnancy.

Can J Cardiol 2021 Sep 24. Epub 2021 Sep 24.

Department of Medicine, Division of Cardiology, University of British Columbia, Vancouver.

Cardiovascular disease has become increasingly prevalent in women of child bearing age in the western world. This has led to CVD now being the leading cause of maternal morbidity and mortality. In the modern era optimal cardiology care is dependent upon cardiovascular imaging and this is especially so in the appropriate management of the pregnant woman with CVD. Read More

View Article and Full-Text PDF
September 2021

A Deep Learning Toolbox for Automatic Segmentation of Subcortical Limbic Structures from MRI Images.

Neuroimage 2021 Sep 24:118610. Epub 2021 Sep 24.

Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA; Harvard Medical School, Radiology Department, Boston, MA, USA.

A tool was developed to automatically segment several subcortical limbic structures (nucleus accumbens, basal forebrain, septal nuclei, hypothalamus without mammillary bodies, the mammillary bodies, and fornix) using only a T1-weighted MRI as input. This tool fills an unmet need as there are few, if any, publicly available tools to segment these clinically relevant structures. A U-Net with spatial, intensity, contrast, and noise augmentation was trained using 39 manually labeled MRI data sets. Read More

View Article and Full-Text PDF
September 2021

Deep learning from MRI-derived labels enables automatic brain tissue classification on human brain CT.

Neuroimage 2021 Sep 24:118606. Epub 2021 Sep 24.

Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden; Department of Psychiatry and Neurochemistry, Institute of Physiology and Neuroscience, University of Gothenburg, Gothenburg, Sweden; Dementia Research Centre, Institute of Neurology, University College London, London, UK; Department of Clinical Physiology, Sahlgrenska University Hospital, Gothenburg, Sweden. Electronic address:

Automatic methods for feature extraction, volumetry, and morphometric analysis in clinical neuroscience typically operate on images obtained with magnetic resonance (MR) imaging equipment. Although CT scans are less expensive to acquire and more widely available than MR scans, their application is currently limited to the visual assessment of brain integrity and the exclusion of co-pathologies. CT has rarely been used for tissue classification because the contrast between grey matter and white matter was considered insufficient. Read More

View Article and Full-Text PDF
September 2021

Empirical Bayes estimation of pairwise maximum entropy model for nonlinear brain state dynamics.

Neuroimage 2021 Sep 24:118618. Epub 2021 Sep 24.

Center for Systems and Translational Brain Science, Institute of Human Complexity and Systems Science, Yonsei University, Seoul, Republic of Korea; Department of Nuclear Medicine, Psychiatry, Yonsei University College of Medicine, Seoul, Republic of Korea; Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, Republic of Korea; Department of Cognitive Science, Yonsei University, Seoul, Republic of Korea. Electronic address:

The pairwise maximum entropy model (pMEM) has recently gained widespread attention to exploring the nonlinear characteristics of brain state dynamics observed in resting-state functional magnetic resonance imaging (rsfMRI). Despite its unique advantageous features, the practical application of pMEM for individuals is limited as it requires a much larger sample than conventional rsfMRI scans. Thus, this study proposes an empirical Bayes estimation of individual pMEM using the variational expectation-maximization algorithm (VEM-MEM). Read More

View Article and Full-Text PDF
September 2021

Vessel Wall Magnetic Resonance Imaging in Covid-19 associated Cryptogenic Ischemic Stroke.

Eur J Neurol 2021 Sep 27. Epub 2021 Sep 27.

Neurology Unit, Department of Neurological Sciences and Vision, ASST-Spedali Civili, Brescia, Italy.

Background: Acute ischemic stroke (AIS) is a common complication of coronavirus disease 19 (COVID-19) but the underlying biological mechanisms remain unclear. We aimed to describe the prevalence of vessel wall alterations in patients with cryptogenic stroke through vessel wall magnetic resonance imaging (vwMRI).

Methods: All consecutive patients admitted for AIS and COVID-19 to a single NeuroCovid unit from November 10th to December 31st, 2020, were prospectively evaluated and underwent a complete etiologic workup for AIS. Read More

View Article and Full-Text PDF
September 2021

Randomised clinical trial: Semaglutide versus placebo reduced liver steatosis but not liver stiffness in subjects with non-alcoholic fatty liver disease assessed by magnetic resonance imaging.

Aliment Pharmacol Ther 2021 Sep 27. Epub 2021 Sep 27.

Profil, Mainz, Germany.

Background: Glucagon-like peptide-1 receptor agonists may be a treatment option in patients with non-alcoholic fatty liver disease (NAFLD).

Aims: To investigate the effects of semaglutide on liver stiffness and liver fat in subjects with NAFLD using non-invasive magnetic resonance imaging (MRI) methods.

Methods: This randomised, double-blind, placebo-controlled trial enrolled subjects with liver stiffness 2. Read More

View Article and Full-Text PDF
September 2021

Associations of fitness and physical activity with specific abdominal fat depots in children with overweight/obesity.

Scand J Med Sci Sports 2021 Sep 27. Epub 2021 Sep 27.

Institute for Innovation & Sustainable Development in Food Chain (IS-FOOD), Public University of Navarra, Campus de Arrosadía, 31006, Pamplona, Spain.

Objectives: To examine the relationship between physical fitness and physical activity (PA) with specific abdominal fat depots and their potential implications for cardiometabolic risk and insulin resistance (IR) in children with overweight/obesity.

Materials And Methods: A total of 116 children with overweight/obesity (10.7±1. Read More

View Article and Full-Text PDF
September 2021

Quantitative Sound Speed Imaging of Cortical Bone and Soft Tissue: Results from Observational Data Sets.

IEEE Trans Med Imaging 2021 Sep 27;PP. Epub 2021 Sep 27.

This work presents the first quantitative ultrasonic sound speed images of ex vivo limb cross-sections containing both soft tissue and bone using Full Waveform Inversion (FWI) with level set (LS) and travel time regularization. The estimated bulk sound speed of bone and soft tissue are within 10% and 1%, respectively, of ground truth estimates. The sound speed imagery shows muscle, connective tissue and bone features. Read More

View Article and Full-Text PDF
September 2021

Right ventricular myocardial infarction in the era of primary percutaneous coronary intervention.

Bratisl Lek Listy 2021 ;122(10):700-707

Right ventricular involvement (RVMI) is a relatively frequent complication in patients developing ST-elevation acute myocardial infarction. The initial diagnosis is most often established using electrocardiography or echocardiography. The gold standard among imaging techniques is cardiac magnetic resonance, which allows to distinguish between reversible and irreversible myocardial damage. Read More

View Article and Full-Text PDF
January 2021

Neuroimaging of situational urgency and incontinence provoked by personal urgency cues.

Neurourol Urodyn 2021 Sep 27. Epub 2021 Sep 27.

Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

Introduction: Situational triggers for urinary urgency and incontinence (UUI) such as "latchkey incontinence" and running water are often reported clinically, but no current clinical tools exist to directly address symptoms of UUI provoked by environmental stimuli. Previously we have shown that urgency and leakage can be reproduced during urodynamic studies with exposure to personal urgency-related images. Here we investigate the neural signatures associated with such situational triggers to inform potential therapies for reducing reactivity to these personal urgency-related cues among women with situational UUI. Read More

View Article and Full-Text PDF
September 2021

Intravoxel Incoherent Motion Diffusion-Weighted Imaging for Predicting and Monitoring the Response of Anti-Angiogenic Treatment in the Orthotopic Nude Mouse Model of Lung Adenocarcinoma.

J Magn Reson Imaging 2021 Sep 27. Epub 2021 Sep 27.

Department of Radiology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China.

Background: The treatment efficacy of angiogenesis inhibitor could be underestimated at an early stage based on tumor volume changes. Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) can quantitatively assess tumors at the cellular level, but it is unclear whether it can provide useful information for assessing treatment response of anti-angiogenic treatment for lung adenocarcinoma.

Purpose: To determine the use of IVIM-DWI for non-invasive monitoring of the early response to anti-angiogenic treatment in the orthotopic transplantation of lung adenocarcinoma model. Read More

View Article and Full-Text PDF
September 2021

IgG4-related hepatic inflammatory pseudotumor mimicking cholangiolocellular carcinoma.

Clin J Gastroenterol 2021 Sep 27. Epub 2021 Sep 27.

Department of Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama, 359-8513, Japan.

Inflammatory pseudotumor (IPT) is a benign tumor mass composed of chronic infiltration of inflammatory cells and fibrous tissue. IgG4-RD (related disease) in the hepatobiliary system has been widely recognized and includes IgG4-related hepatic IPT. This report describes a patient with IgG4-related hepatic IPT with sclerosing cholangitis. Read More

View Article and Full-Text PDF
September 2021

The Influence of the Head Model Conductor on the Source Localization of Auditory Evoked Potentials.

Brain Topogr 2021 Sep 27. Epub 2021 Sep 27.

Department of Psychology, University of South Carolina, Columbia, USA.

The accuracy of EEG source analysis reconstruction improves when a realistic head volume conductor is modeled. In this study we investigated how the progressively more complex head representations influence the spatial localization of auditory-evoked potentials (AEPs). Fourteen young-adult participants with normal hearing performed the AEP task. Read More

View Article and Full-Text PDF
September 2021

Challenges and opportunities to delivering cardiac imaging training: a national survey by the Italian college of cardiac radiology.

Insights Imaging 2021 Sep 27;12(1):136. Epub 2021 Sep 27.

Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, 20072, Pieve Emanuele, Milan, Italy.

Background: Delivering consistent levels of training in cardiac imaging to radiologist is of pivotal importance because of the increasing clinical indications to coronary computed tomography angiography (CCTA) and cardiac magnetic resonance (CMR). Our study sought to capture the heterogeneity of cardiac imaging training programs and to explore residents' vision on cardiac imaging both in the present and in the future.

Methods: Two web-based surveys were created. Read More

View Article and Full-Text PDF
September 2021

Unilateral agenesis of internal carotid artery with interparaclinoid and contralateral carotid-anterior cerebral artery anastomoses diagnosed by magnetic resonance angiography: a case report.

Surg Radiol Anat 2021 Sep 27. Epub 2021 Sep 27.

Department of Radiology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, 1-8-1 Jigyohama, Chuo-ku, Fukuoka, 810-0065, Japan.

Purpose: Unilateral agenesis of the internal carotid artery (ICA) is a rare anatomical variant. We identified a case of unilateral ICA agenesis with interparaclinoid and contralateral carotid-ACA anastomoses.

Methods: A 65-year-old female with a long history of depressive episodes underwent MR imaging including MR angiography at National Hospital Organization Kyushu Medical Center. Read More

View Article and Full-Text PDF
September 2021

Quantitative Analysis of Eyeball Rotation During Lateral Gaze in Intermittent Exotropia: A Magnetic Resonance Imaging Study.

Transl Vis Sci Technol 2021 Sep;10(11):20

Department of Ophthalmology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea.

Purpose: To evaluate the eyeball rotation during lateral gaze in patients with intermittent exotropia (IXT) using three-dimensional magnetic resonance imaging (MRI).

Methods: In this prospective observational study, patients with IXT (n = 29) underwent orbital MRI during central, right, and left gazes. Fixation targets were placed at a 40° angle for lateral gaze. Read More

View Article and Full-Text PDF
September 2021

Standardized Data Acquisition for Neuromelanin-sensitive Magnetic Resonance Imaging of the Substantia Nigra.

J Vis Exp 2021 Sep 8(175). Epub 2021 Sep 8.

New York State Psychiatric Institute; Department of Psychiatry, Columbia University;

The dopaminergic system plays a crucial role in healthy cognition (e.g., reward learning and uncertainty) and neuropsychiatric disorders (e. Read More

View Article and Full-Text PDF
September 2021

Impact of novel deep learning image reconstruction algorithm on diagnosis of contrast-enhanced liver computed tomography imaging: Comparing to adaptive statistical iterative reconstruction algorithm.

J Xray Sci Technol 2021 Sep 18. Epub 2021 Sep 18.

Department of Radiology, the Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong Province, China.

Objective: To assess clinical application of applying deep learning image reconstruction (DLIR) algorithm to contrast-enhanced portal venous phase liver computed tomography (CT) for improving image quality and lesions detection rate compared with using adaptive statistical iterative reconstruction (ASIR-V) algorithm under routine dose.

Methods: The raw data from 42 consecutive patients who underwent contrast-enhanced portal venous phase liver CT were reconstructed using three strength levels of DLIRs (low [DL-L]; medium [DL-M]; high [DL-H]) and two levels of ASIR-V (30%[AV-30]; 70%[AV-70]). Objective image parameters, including noise, signal-to-noise (SNR), and the contrast-to-noise ratio (CNR) relative to muscle, as well as subjective parameters, including noise, artifact, hepatic vein-clarity, index lesion-clarity, and overall scores were compared pairwise. Read More

View Article and Full-Text PDF
September 2021

Kodama-XUUB: an informative classification for alveolar echinococcosis hepatic lesions on magnetic resonance imaging.

Parasite 2021 27;28:66. Epub 2021 Sep 27.

University Bourgogne Franche-Comté (UFC) and Besançon University Hospital, WHO Collaborating Centre on Prevention and Treatment of Human Echinococcosis/National French Reference Centre for Echinococcosis, UMR 6249 CNRS-UFC Chrono-environment, 25030 Besançon, France - Nanomedicine Laboratory, INSERM EA 4662, University of Franche-Comté, 25000 Besançon, France.

Objective: To propose a modification of the Kodama classification to classify type III lesions of alveolar echinococcosis (AE) that do not have microcysts.

Materials And Methods: 200 magnetic resonance imaging (MRI) images of AE liver lesions from four endemic regions of the world were classified according to Kodama, distinguishing within type III those with microcysts from those without. Each center included 50 MRIs of patients with unoperated AA liver lesions. Read More

View Article and Full-Text PDF
September 2021

Novel Reversible-Binding PET Ligands for Imaging Monoacylglycerol Lipase Based on the Piperazinyl Azetidine Scaffold.

J Med Chem 2021 Sep 27. Epub 2021 Sep 27.

The Skaggs Institute for Chemical Biology and Department of Chemical Physiology, The Scripps Research Institute, SR107 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Monoacylglycerol lipase (MAGL) is a 33 kDa serine protease primarily responsible for hydrolyzing 2-arachidonoylglycerol into the proinflammatory eicosanoid precursor arachidonic acid in the central nervous system. Inhibition of MAGL constitutes an attractive therapeutic concept for treating psychiatric disorders and neurodegenerative diseases. Herein, we present the design and synthesis of multiple reversible MAGL inhibitor candidates based on a piperazinyl azetidine scaffold. Read More

View Article and Full-Text PDF
September 2021