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https://www.readbyqxmd.com/read/28537800/advanced-mri-techniques-for-the-hip-joint-focus-on-the-postoperative-hip
#1
Jennifer L Berkowitz, Hollis G Potter
OBJECTIVE: Imaging the hip joint with optimized MRI protocol parameters provides the radiologist with the ability to reliably diagnose complex hip abnormalities. The institution of appropriate metal artifact reduction techniques and dedicated sequences can enhance visualization of the periprosthetic bone and soft tissues and allow improved detection of the more frequently encountered total hip arthroplasty-related conditions, such as mechanical loosening, polyethylene wear, and adverse local tissue reactions...
May 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28534182/imaging-children-suffering-from-lymphoma-an-evaluation-of-different-18-f-fdg-pet-mri-protocols-compared-to-whole-body-dw-mri
#2
Julian Kirchner, Cornelius Deuschl, Bernd Schweiger, Ken Herrmann, Michael Forsting, Christian Buchbender, Gerald Antoch, Lale Umutlu
OBJECTIVES: The objectives of this study were to evaluate and compare the diagnostic potential of different PET/MRI reading protocols, entailing non-enhanced / contrast-enhanced and diffusion-weighted (18)F-FDG PET/MR imaging and whole-body diffusion-weighted MRI for lesion detection and determination of the tumor stage in pediatric lymphoma patients. METHODS: A total of 28 (18)F-FDG PET/MRI datasets were included for analysis of four different reading protocols: (1) PET/MRI utilizing sole unenhanced T2w and T1w imaging, (2) PET/MRI utilizing additional contrast enhanced sequences, (3) PET/MR imaging utilizing unenhanced, contrast enhanced and DW imaging or (4) WB-DW-MRI...
May 22, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28533670/diagnostic-value-of-gadobenate-dimeglumine-enhanced-hepatocyte-phase-magnetic-resonance-imaging-in-evaluating-hepatic-fibrosis-and-hepatitis
#3
Xiu-Mei Li, Zhu Chen, En-Hua Xiao, Quan-Liang Shang, Cong Ma
AIM: To evaluate the diagnostic value of gadobenate dimeglumine (Gd-BOPTA)-enhanced hepatocyte-phase magnetic resonance imaging (MRI) in evaluating hepatic fibrosis and hepatitis. METHODS: Hepatocyte-phase images of Gd-BOPTA-enhanced MRI were retrospectively evaluated in 76 patients with chronic liver disease. These patients were classified into five groups according to either the histopathological fibrosis stage (S0-S4) or the histopathological hepatitis grade (G0-G4)...
May 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28529876/pathology-of-callosal-damage-in-als-an-ex-vivo-7%C3%A2-t-diffusion-tensor-mri-study
#4
Agustin M Cardenas, Joelle E Sarlls, Justin Y Kwan, Devin Bageac, Zachary S Gala, Laura E Danielian, Abhik Ray-Chaudhury, Hao-Wei Wang, Karla L Miller, Sean Foxley, Saad Jbabdi, Robert C Welsh, Mary Kay Floeter
OBJECTIVES: The goal of this study was to better understand the changes in tissue microstructure that underlie white matter diffusion changes in ALS patients. METHODS: Diffusion tensor imaging was carried out in postmortem brains of 4 ALS patients and two subjects without neurological disease on a 7 T MRI scanner using steady-state free precession sequences. Fractional anisotropy (FA) was measured in the genu, body, and splenium of the corpus callosum in formalin-fixed hemispheres...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28528429/myocardial-edema-in-acute-myocarditis-relationship-of-t2-relaxometry-and-late-enhancement-burden-by-using-dual-contrast-turbo-spin-echo-mri
#5
A Mayr, G Klug, H J Feistritzer, S J Reinstadler, M Reindl, R Esterhammer, G Feuchtner, B Metzler, M F Schocke
To quantify myocardial edema by using a T2 relaxometry approach with a dual-contrast turbo spin-echo (dcTSE) sequence in patients with acute myocarditis regarding focal late gadolinium enhancement (LGE) burden. CMR T2 relaxometry was performed in 39 patients (age 41 ± 19 years; 36% women) with LGE in a typical myocarditis pattern and in ten healthy volunteers (age 46 ± 12; 60% woman). dcTSE sequence (echo time 29 and 75 ms, respectively) was used for T2 mapping, analysis were performed on the basis of region of interest (ROI)...
May 20, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28528164/mri-derived-myocardial-strain-measures-in-normal-subjects
#6
Ha Q Vo, Thomas H Marwick, Kazuaki Negishi
OBJECTIVES: The aim of this study was to perform a systematic review and meta-analysis to estimate the normal ranges of magnetic resonance imaging (MRI)-based feature tracking (FT) and to identify sources of variations. Similar analyses were also performed for strain encoding, displacement encoding with stimulated echoes, and myocardial tagging. BACKGROUND: MRI-FT is a novel technique for quantification of myocardial deformation using MRI cine images. However, the reported 95% confidence intervals (CIs) from the 2 largest studies have no overlaps...
May 11, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28527090/stroke-like-attack-first-episode-of-sporadic-hemiplegic-migraine
#7
Enrico Ferrante, Valentina Prone, Marco Longoni, Elio Clemente Agostoni
Hemiplegic migraine (HM) is a rare migraine with aura; it can be familiar or sporadic. A 46-years-old man presented left migraine followed by right hemiparesis with bilateral plantar flexion of cutaneous plantar reflex (CPR). Brain CT and CT-angiography were normal. The next day patient got worse. The EEG showed left fronto-temporal cuspidate delta waves and brain MRI showed a minimal hyperintensity at T2-sequences in the left frontal cortex with a minor representation of the cortical veins at susceptibility weighted imaging sequences...
May 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28526432/quantitative-susceptibility-mapping-using-principles-of-echo-shifting-with-a-train-of-observations-sequence-on-1-5t-mri
#8
Hirohito Kan, Nobuyuki Arai, Harumasa Kasai, Hiroshi Kunitomo, Yasujiro Hirose, Yuta Shibamoto
PURPOSE: To evaluate the accuracy of susceptibility estimated from the principles of echo shifting with a train of observations (PRESTO) sequence using a 1.5T MRI system, we conducted experiments on the human brain using the PRESTO sequence and compared our results with the susceptibility obtained from spoiled gradient-recalled echo (GRE) sequence with flow compensation using quantitative susceptibility mapping (QSM) reconstruction. MATERIALS AND METHODS: Experiments on the human brain were conducted on 12 healthy volunteers (27±4years) using PRESTO and spoiled GRE sequences on a 1...
May 16, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28524829/role-of-diffusion-weighted-and-contrast-enhanced-magnetic-resonance-imaging-in-differentiating-activity-of-ankylosing-spondylitis
#9
Ying-Hua Zhao, Yan-Yan Cao, Qun Zhang, Ying-Jie Mei, Ji-Jie Xiao, Shao-Yong Hu, Wei Li, Shao-Lin Li
BACKGROUND: Previous studies showed that combining apparent diffusion coefficient (ADC) value with the Spondyloarthritis Research Consortium of Canada (SPARCC) index value might provide a reliable evaluation of the activity of ankylosing spondylitis (AS), and that contrast-enhanced (CE) magnetic resonance imaging (MRI) is unnecessary. However, the results were based on confirming only a small random sample. This study aimed to assess the role of CE-MRI in differentiating the disease activity of AS by comparing ADC value with a large sample...
June 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28524792/analysis-and-interrater-reliability-of-pb-c2-using-mri-and-ct-data-from-the-park-reeves-syringomyelia-research-consortium-on-behalf-of-the-pediatric-craniocervical-society
#10
Todd C Hankinson, Gerald F Tuite, Dagmara I Moscoso, Leslie C Robinson, James C Torner, David D Limbrick, Tae Sung Park, Richard C E Anderson
OBJECTIVE The distance to the ventral dura, perpendicular to the basion to C2 line (pB-C2), is commonly employed as a measure describing the anatomy of the craniovertebral junction. However, both the reliability among observers and the clinical utility of this measurement in the context of Chiari malformation Type I (CM-I) have been incompletely determined. METHODS Data were reviewed from the first 600 patients enrolled in the Park-Reeves Syringomyelia Research Consortium with CM-I and syringomyelia. Thirty-one cases were identified in which both CT and MRI studies were available for review...
May 19, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28523317/mri-as-indicator-of-pulmonary-tuberculosis-activity-from-morphological-to-molecular-level-assessment-a-case-report
#11
Maria Teodora Antuaneta Buzan, Hanelore Herta, Mihaela Maria Coman, Daniela Homorodean, Silviu Andrei Sfrângeu, Carmen Monica Pop
We present the case of an adult patient with active post-primary pulmonary tuberculosis (TB) and discuss specific morphological and textural aspects found at high-field magnetic resonance imaging (MRI) of the lung. The 42-year-old man, heavy smoker, undertook a routine employment medical examination and was admitted to a referral pulmonology and TB center due to the abnormal findings seen on his chest radiography. The patient presented nonspecific symptoms, bilateral bronchial breath at pulmonary auscultation, inflammatory syndrome on the laboratory blood tests and positive sputum smears for acid-fast bacilli, which together with the typical aspect on the chest radiography lead to a diagnosis of post-primary pulmonary TB and administration of specific medication...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28522877/dce-mri-background-parenchymal-enhancement-quantified-from-an-early-versus-delayed-post-contrast-sequence-association-with-breast-cancer-presence
#12
Shandong Wu, Margarita L Zuley, Wendie A Berg, Brenda F Kurland, Rachel C Jankowitz, Jules H Sumkin, David Gur
We investigated automated quantitative measures of background parenchymal enhancement (BPE) derived from an early versus delayed post-contrast sequence in breast dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for association with breast cancer presence in a case-control study. DCE-MRIs were retrospectively analyzed for 51 cancer cases and 51 controls with biopsy-proven benign lesions, matched by age and year-of-MRI. BPE was quantified using fully-automated validated computer algorithms, separately from three sequential DCE-MRI post-contrast-subtracted sequences (SUB1, SUB2, and SUB3)...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522663/the-use-of-noncontrast-quantitative-mri-to-detect-gadolinium-enhancing-multiple-sclerosis-brain-lesions-a-systematic-review-and-meta-analysis
#13
A Gupta, K Al-Dasuqi, F Xia, G Askin, Y Zhao, D Delgado, Y Wang
BACKGROUND: Concerns have arisen about the long-term health effects of repeat gadolinium injections in patients with multiple sclerosis and the incomplete characterization of MS lesion pathophysiology that results from relying on enhancement characteristics alone. PURPOSE: Our aim was to perform a systematic review and meta-analysis analyzing whether noncontrast MR imaging biomarkers can distinguish enhancing and nonenhancing brain MS lesions. DATA SOURCES: Our sources were Ovid MEDLINE, Ovid Embase, and the Cochrane data base from inception to August 2016...
May 18, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28521822/central-nervous-system-manganese-induced-lesions-and-clinical-consequences-in-patients-with-hereditary-hemorrhagic-telangiectasia
#14
M M Serra, C H Besada, A Cabana Cal, A Saenz, C V Stefani, D Bauso, A B Golimstok, J C Bandi, D H Giunta, C M Elizondo
BACKGROUND: Around 47-74% of patients with hereditary hemorrhagic telangiectasia (HHT) have hepatic vascular malformations (HVMs); magnetic resonance images (MRI) of the central nervous system (CNS) might show in T1 sequences a hyper-intensity signal in different areas, mainly in the basal ganglia (BG) as consequence of manganese (Mn) deposits as observed in cirrhotic patients. These patients might suffer from different neuropsychiatric disorders (hepatic encephalopathy). In HHT patients, even in the presence of hepatic shunts, hepatocellular function is usually preserved...
May 18, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28520813/pancreatic-fat-content-by-magnetic-resonance-imaging-in-subjects-with-prediabetes-diabetes-and-controls-from-a-general-population-without-cardiovascular-disease
#15
Sophia D Heber, Holger Hetterich, Roberto Lorbeer, Christian Bayerl, Jürgen Machann, Sigrid Auweter, Corinna Storz, Christopher L Schlett, Konstantin Nikolaou, Maximilian Reiser, Annette Peters, Fabian Bamberg
BACKGROUND/OBJECTIVE: Despite the relevance of pancreatic fat content in the development of metabolic diseases, its association with impaired glucose metabolism, diabetes, and other adipose tissue compartments remains unclear. Thus, we determined differences in pancreatic fat content by magnetic resonance imaging (MRI) between subjects with prediabetes, diabetes, and normal controls in a cohort from the general population. METHODS: Subjects without history of cardiovascular disease with established diabetes or prediabetes as well as normal controls were included and underwent whole-body MRI on a 3T scanner...
2017: PloS One
https://www.readbyqxmd.com/read/28520778/texture-analysis-using-proton-density-and-t2-relaxation-in-patients-with-histological-usual-interstitial-pneumonia-uip-or-nonspecific-interstitial-pneumonia-nsip
#16
Maria T A Buzan, Andreas Wetscherek, Claus Peter Heussel, Michael Kreuter, Felix J Herth, Arne Warth, Hans-Ulrich Kauczor, Carmen Monica Pop, Julien Dinkel
OBJECTIVES: The purpose of our study was to assess proton density (PD) and T2 relaxation time of usual interstitial pneumonia (UIP) and nonspecific interstitial pneumonia (NSIP) and to evaluate their utility in differentiating the two patterns. Furthermore, we aim to investigate whether these two parameters could help differentiate active-inflammatory and stable-fibrotic lesions in NSIP. METHODS: 32 patients (mean age: 69 years; M:F, 1:1) with pathologically proven disease (UIP:NSIP, 1:1), underwent thoracic thin-section multislice CT scan and 1...
2017: PloS One
https://www.readbyqxmd.com/read/28516809/real-time-mri-guided-percutaneous-sclerotherapy-treatment-of-venous-low-flow-malformations-in-the-head-and-neck
#17
Sasan Partovi, Ziang Lu, Lorenna Vidal, Dean A Nakamoto, Ji Buethe, Michael Coffey, Indravadan J Patel
Purpose This manuscript describes the technique of real-time MRI-guided sclerotherapy for low-flow venous malformations in the head and neck based on our institutional experience. Materials and methods Ethanolamine oleate is used as the sclerosant and is mixed with gadolinium for visualization during the procedure. The five procedural steps include: (I) an initial tri-plane T2-weighted sequence to visualize the lesion; (II) a T1 FSE or trueFISP sequence to assess needle placement and advancement within the lesion; (III) a tri-plane T1 FLASH sequence to monitor sclerosant injection; (IV) a T1 FSE or VIBE sequence to assess sclerosant coverage of the malformation before needle removal; (V) a post-procedural tri-plane T1 fat-saturated sequence to confirm sclerosant coverage of the lesion...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28516050/towards-mri-temperature-mapping-in-real-time-the-proton-resonance-frequency-method-with-undersampled-radial-mri-and-nonlinear-inverse-reconstruction
#18
Zhongshuai Zhang, Thomas Michaelis, Jens Frahm
BACKGROUND: Optimal control of minimally invasive interventions by hyperthermia requires dynamic temperature mapping at high temporal resolution. METHODS: Based on the temperature-dependent shift of the proton resonance frequency (PRF), this work developed a method for real-time MRI thermometry which relies on highly undersampled radial FLASH MRI sequences with iterative image reconstruction by regularized nonlinear inversion (NLINV). As a first step, the method was validated with use of a temperature phantom and ex vivo organs (swine kidney) subjected to heating by warm water or a pulsed laser source...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516047/prospective-cardiac-motion-self-gating
#19
Fei Han, Stanislas Rapacchi, Peng Hu
BACKGROUND: To develop a prospective cardiac motion self-gating method that provides robust and accurate cardiac triggers in real time. METHODS: The proposed self-gating method consists of an "imaging mode" that acquires the k-space segments and a "self-gating mode" that captures the cardiac motion by repeatedly sampling the k-space centerline. A training based principal component analysis algorithm is utilized to process the self-gating data where the projection onto the first principal component was used as the self-gating signal...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28516043/quantification-of-regional-deformation-of-the-lungs-by-non-rigid-registration-of-three-dimensional-contrast-enhanced-magnetic-resonance-imaging
#20
Jiaxin Shao, Peng Hu
BACKGROUND: Assessment of lung function is vital for the diagnosis of a variety of pathological conditions. Research has been proposed to study pulmonary mechanics and kinematics using two-dimensional (2D) magnetic resonance imaging (MRI). This allows estimation of regional lung tissue mechanics but is limited to 2D information. An approach based on three-dimensional (3D) contrast-enhanced MR angiogram of pulmonary blood vessels and a non-rigid image registration technique is proposed for quantification of lung regional deformations, which can potentially be used for assessment of pulmonary parenchymal mechanics and regional ventilation for disease diagnosis without ionizing radiation...
April 2017: Quantitative Imaging in Medicine and Surgery
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