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3D Echo

Shreyas Harita, Gabriela Ioachim, Jocelyn Powers, Patrick W Stroman
Resting-state functional magnetic resonance imaging (rs-fMRI) has been used to investigate networks within the cortex and has also provided some insight into the networks present in the brainstem (BS) and spinal cord (SC). The purpose of this study was to investigate resting-state blood oxygenation-level dependent (BOLD) fluctuations in the BS/SC and to identify resting-state networks (RSNs) across these regions. Resting-state BOLD fMRI data were obtained from the entire BS and cervical SC in 16 healthy participants, at 3 T, with T2 -weighted single-shot fast spin-echo imaging...
February 15, 2019: Neuroscience
Kyunghyun Sung
BACKGROUND: An estimation of an intravascular dispersion parameter was previously proposed to improve the overall accuracy and precision of the model parameters, but the high computation complexity can limit its practical usability in prostate dynamic contrast-enhanced MRI (DCE-MRI). PURPOSE: To compare and evaluate the model fitting uncertainty and error in the model parameter estimation using different DCE-MRI analysis models and to evaluate the ability of the intravascular dispersion parameter to delineate between noncancerous and cancerous prostate tissue in the transition and peripheral zones...
February 17, 2019: Journal of Magnetic Resonance Imaging: JMRI
Sudesh Kumar, Suresh Kumar, Mukesh Surya, Anjali Mahajan, Sanjiv Sharma
Aims: The aim of this study is to compare postcontrast three-dimensional (3D) T1-Sampling perfection with application-optimized contrasts by using different flip angle evolutions, 3D fluid-attenuated inversion recovery (FLAIR), and 3D T1-magnetization prepared rapid gradient echo (MPRAGE) sequences in patients of meningitis. Settings and Design: A hospital-based cross-sectional study done in the Department of Radiodiagnosis, IGMC Shimla for a period of 1 year from June 1, 2016, to May 30, 2017...
January 2019: Journal of Neurosciences in Rural Practice
Lachlan Bird, Arkiev D'Souza, Iain Ball, Caroline Rae, Robert D Herbert, Bart Bolsterlee
Muscle performance is closely related to the structure and function of tendons and aponeuroses, the sheet-like, intramuscular parts of tendons. The architecture of aponeuroses has been difficult to study with magnetic resonance imaging (MRI) because these thin, collagen-rich connective tissues have very short transverse relaxation (T2) times and therefore provide a weak signal with conventional MRI sequences. Here, we validated measurements of aponeurosis dimensions from two MRI sequences commonly used in muscle-tendon research (mDixon and T1-weighted images), and an ultrashort echo time (UTE) sequence designed for imaging tissues with short T2 times...
February 11, 2019: Scandinavian Journal of Medicine & Science in Sports
Enrico Calogero, Iacopo Fabiani, Nicola Riccardo Pugliese, Veronica Santini, Lorenzo Ghiadoni, Rossella Di Stefano, Fabio Galetta, Ferdinando Sartucci, Giuseppe Penno, Raffaella Berchiolli, Mauro Ferrari, Dania Cioni, Vinicio Napoli, Raffaele De Caterina, Vitantonio Di Bello, Davide Caramella
The introduction of three-dimensional echography (3D echo) in vascular field is not recent, but it still remains a seldom-used technique because of the costs of ultrasound probe and the need of dedicated laboratories. Therefore, despite significant prognostic implications, the high diagnostic accuracy in plaque definition, and the relative ease of use, 3D echo in vascular field is a niche technique. The purpose of this review is mainly clinical and intends to demonstrate the potential strength of a 3D approach, including technical aspects, in order to present to clinicians and imagers the appealing aspects of a noninvasive and radiation-free methodology with relevant diagnostic and prognostic correlates in the assessment of carotid atherosclerosis...
October 2018: Journal of Cardiovascular Echography
Jean Delacoste, Helene Feliciano, Jérôme Yerly, Vincent Dunet, Catherine Beigelman-Aubry, Giulia Ginami, Ruud B van Heeswijk, Davide Piccini, Matthias Stuber, Alain Sauty
PURPOSE: Ultra-short echo time MRI is a promising alternative to chest CT for cystic fibrosis patients. Black-blood imaging in particular could help discern small-sized anomalies, such as mucoid plugging, which may otherwise be confused with neighboring blood vessels, particularly when contrast agent is not used. We, therefore, implemented and tested an ultra-short echo time sequence with black-blood preparation. Additionally, this sequence may also be used to generate bright-blood angiograms...
February 8, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Elisabeth Klupp, Barbara Cervantes, Sarah Schlaeger, Stephanie Inhuber, Florian Kreuzpointer, Ansgar Schwirtz, Alexander Rohrmeier, Michael Dieckmeyer, Dennis M Hedderich, Maximilian N Diefenbach, Friedemann Freitag, Ernst J Rummeny, Claus Zimmer, Jan S Kirschke, Dimitrios C Karampinos, Thomas Baum
BACKGROUND: The paraspinal muscles play an important role in the onset and progression of lower back pain. It would be of clinical interest to identify imaging biomarkers of the paraspinal musculature that are related to muscle function and strength. Diffusion tensor imaging (DTI) enables the microstructural examination of muscle tissue and its pathological changes. PURPOSE: To investigate associations of DTI parameters of the lumbar paraspinal muscles with isometric strength measurements in healthy volunteers...
February 5, 2019: Journal of Magnetic Resonance Imaging: JMRI
Roland Krug, Gabrielle B Joseph, Misung Han, Aaron Fields, Justin Cheung, Maya Mundada, Jeannie Bailey, Alice Rochette, Alexander Ballatori, Charles E McCulloch, Zachary McCormick, Conor O'Neill, Thomas M Link, Jeffrey Lotz
BACKGROUND: There is an interplay between the intervertebral disc (IVD) and the adjacent bone marrow that may play a role in the development of IVD degeneration and might influence chronic lower back pain (CLBP). PURPOSE: To apply novel quantitative MRI techniques to assess the relationship between vertebral bone marrow fat (BMF) and biochemical changes in the adjacent IVD. STUDY TYPE: Prospective. SUBJECTS: Forty-six subjects (26 female and 20 male) with a mean age of 47...
January 30, 2019: Journal of Magnetic Resonance Imaging: JMRI
Arthur Coste, Fawzi Boumezbeur, Alexandre Vignaud, Guillaume Madelin, Kathrin Reetz, Denis Le Bihan, Cécile Rabrait-Lerman, Sandro Romanzetti
PURPOSE: The state-of-the-art method to quantify sodium concentrations in vivo consists in a fully relaxed 3D spin-density (SD) weighted acquisition. Nevertheless, most sodium MRI clinical studies use short-TR SD acquisitions to reduce acquisition durations. We present a clinically viable implementation of the Variable Flip Angle (VFA) method for robust and clinically viable quantification of total sodium concentration (TSC) and longitudinal relaxation rates in vivo in human brain at 3 T...
January 26, 2019: Magnetic Resonance Imaging
Chengcheng Zhu, Joseph R Leach, Bing Tian, Lizhen Cao, Zhaoying Wen, Yan Wang, Xinke Liu, Qi Liu, Jianping Lu, David Saloner, Michael D Hope
BACKGROUND: Intraluminal thrombus (ILT) signal intensity on MRI has been studied as a potential marker of abdominal aortic aneurysm (AAA) progression. PURPOSE: 1) To characterize the relationship between ILT signal intensity and AAA diameter; 2) to evaluate ILT change over time; and 3) to assess the relationship between ILT features and AAA growth. STUDY TYPE: Prospective. SUBJECTS: Eighty AAA patients were imaged, and a subset (n = 41) were followed with repeated MRI for 16 ± 9 months...
January 29, 2019: Journal of Magnetic Resonance Imaging: JMRI
Azadeh Sharafi, Rahman Baboli, Gregory Chang, Ravinder R Regatte
BACKGROUND: In addition to the articular cartilage, osteoarthritis (OA) affects several other tissues such as tendons, ligaments, and subchondral bone. T1ρ relaxation study of these short T2 tissues may provide a more comprehensive evaluation of OA. PURPOSE: To develop a 3D spin-lattice relaxation in the rotating frame (T1ρ ) prepared zero echo time (ZTE)-based pointwise encoding time reduction with radial acquisition (3D-T1ρ -PETRA) sequence for relaxation mapping of semisolid short-T2 tissues on a clinical 3 T scanner...
January 28, 2019: Journal of Magnetic Resonance Imaging: JMRI
Sunil Koundal, Xiaodan Liu, Simon Sanggaard, Kristian Mortensen, Joanna Wardlaw, Maiken Nedergaard, Helene Benveniste, Hedok Lee
Cerebral small vessel disease(s) (SVD) result from pathological changes of the small blood vessels in the brain and is common in older people. The diagnostic features by which SVD manifests in brain includes white matter hyperintensities, lacunes, dilated perivascular spaces, microbleeds, and atrophy. In the present study, we use in vivo MRI to characterize brain morphometry and longitudinal relaxation time (T1) of spontaneously hypertensive rats (SHR) to study the contribution of chronic hypertension to SVD relevant pathology...
January 25, 2019: Neuroscience
Mara Gavazzoni, Alberto Pozzoli, Carlos A Mestres, Francesco Maisano
No abstract text is available yet for this article.
January 23, 2019: European Heart Journal
Neville D Gai, John A Butman
BACKGROUND: Arterial spin labeling with 3D acquisition requires determining a single postlabeling delay (PLD) value. PLD affects the signal-to-noise ratio (SNR) per unit time as well as quantitative cerebral blood flow (CBF) values due to its bearing on the presence of a vascular signal. PURPOSE: To search for an optimal PLD for pseudocontinuous arterial spin labeling (pCASL) using patient-specific carotid artery blood velocity measurements. STUDY TYPE: Prospective...
January 25, 2019: Journal of Magnetic Resonance Imaging: JMRI
Chris J Cadman, Lyndsay Fraser, Claire McArthur
History A 1-year-old boy was referred for cochlear implant assessment after he received a diagnosis of bilateral profound sensorineural hearing loss at neonatal hearing screening shortly after birth. The child was born at term via uneventful delivery, and there was no history of familial hearing loss or maternal illness. Tympanic membranes were normal, and hearing loss was confirmed with auditory brainstem testing, which showed no response from either ear. Hearing aids were provided from 3 months of age, but no behavioral responses were noted when these were worn...
February 2019: Radiology
Nian Wang, Anthony J Mirando, Gary Cofer, Yi Qi, Matthew J Hilton, G Allan Johnson
PURPOSE: To evaluate whole knee joint tractography, including articular cartilage, ligaments, meniscus, and growth plate using diffusion tensor imaging (DTI) at microscopic resolution. METHODS: Three rat knee joints were scanned using a modified 3D diffusion-weighted spin echo pulse sequence with 90- and 45-μm isotropic spatial resolution at 9.4T. The b values varied from 250 to 1250 s/mm2 with 4 times undersampling in phase directions. Fractional anisotropy (FA) and mean diffusivity (MD) were compared at different spatial resolution and b values...
January 22, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Houchun H Hu, Thomas Benkert, Mark Smith, Jeremy Y Jones, Aaron S McAllister, Jerome A Rusin, Ramkumar Krishnamurthy, Kai Tobias Block
PURPOSE: MRI methods that have reduced sensitivity to motion are attractive in pediatric applications. In spine imaging, physiologic motion such as respiration and cerebrospinal fluid pulsation can hamper diagnostic image quality. We compare a 3D T1-weighted non-Cartesian radial acquisition with a conventional Cartesian 2D turbo-spin-echo (TSE) acquisition in axial post-contrast spine imaging at 3T. METHODS: Thirty-two patients (mean age 12.2 ± 5.3 years) scheduled for routine clinical spine exams with contrast were enrolled...
January 21, 2019: Neuroradiology
Nico Sollmann, Nina Mathonia, Dominik Weidlich, Michaela Bonfert, Sebastian A Schroeder, Katharina A Badura, Tabea Renner, Florian Trepte-Freisleder, Carl Ganter, Sandro M Krieg, Claus Zimmer, Ernst J Rummeny, Dimitrios C Karampinos, Thomas Baum, Mirjam N Landgraf, Florian Heinen
BACKGROUND: Research in migraine points towards central-peripheral complexity with a widespread pattern of structures involved. Migraine-associated neck and shoulder muscle pain has clinically been conceptualized as myofascial trigger points (mTrPs). However, concepts remain controversial, and the identification of mTrPs is mostly restricted to manual palpation in clinical routine. This study investigates a more objective, quantitative assessment of mTrPs by means of magnetic resonance imaging (MRI) with T2 mapping...
January 18, 2019: Journal of Headache and Pain
Edzo M E Klawer, Petra J van Houdt, Frank F J Simonis, Cornelis A T van den Berg, Floris J Pos, Stijn W T P J Heijmink, Sofie Isebaert, Karin Haustermans, Uulke A van der Heide
PURPOSE: The arterial input function (AIF) is a major source of uncertainty in tracer kinetic (TK) analysis of dynamic contrast-enhanced (DCE)-MRI data. The aim of this study was to investigate the repeatability of AIFs extracted from the complex signal and of the resulting TK parameters in prostate cancer patients. METHODS: Twenty-two patients with biopsy-proven prostate cancer underwent a 3T MRI exam twice. DCE-MRI data were acquired with a 3D spoiled gradient echo sequence...
January 17, 2019: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
S M Robbins, F Abram, M Boily, J-P Pelletier, J Martel-Pelletier
OBJECTIVE: To compare cartilage thickness between patients with non-traumatic and post-traumatic knee osteoarthritis (OA) and healthy controls and to determine if disease severity and alignment impact these differences. DESIGN: Participants with non-traumatic (n = 22) and post-traumatic (n = 19) knee OA, and healthy controls (n = 22) were recruited for this cross-sectional study. Participants underwent 3T magnetic resonance imaging (T1-weighted, 3D sagittal gradient echo sequence) and cartilage thickness was determined in four regions: medial and lateral condyle, and medial and lateral plateau...
January 14, 2019: Osteoarthritis and Cartilage
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