keyword
MENU ▼
Read by QxMD icon Read
search

Echo intensity

keyword
https://www.readbyqxmd.com/read/28730173/surface-coil-intensity-correction-in-magnetic-resonance-imaging-in-spinal-metastases
#1
Hong Ren, Wei Lin, Xianjun Ding
OBJECTIVE: To evaluate the clinical application of phased-array surface coil intensity correction in magnetic resonance imaging (MRI) in spinal metastases. METHODS: 3 phantoms and 50 patients with a corresponding total number of 80 spinal metastases were included in this study. Fast spin echo T1- and T2- weighted MRI with and without surface coil intensity correction was routinely performed for all phantoms and patients. Phantoms were evaluated by means of variance to mean ratio of signal intensity on both T1- and T2- weighted MRI obtained with and without surface coil intensity correction...
2017: Open Medicine (Warsaw, Poland)
https://www.readbyqxmd.com/read/28716586/comparison-of-three-dimensional-t1-weighted-magnetic-resonance-and-contrast-enhanced-ultrasound-plaque-images-for-severe-stenosis-of-the-cervical-carotid-artery
#2
Yasuyoshi Shimada, Kohki Oikawa, Shunrou Fujiwara, Yasushi Ogasawara, Yuiko Sato, Shinsuke Narumi, Tadayoshi Kato, Kazumasa Oura, Yasuo Terayama, Makoto Sasaki, Kentaro Fujimoto, Jun Yoshida, Kuniaki Ogasawara
BACKGROUND AND PURPOSE: Magnetic resonance (MR) and contrast-enhanced ultrasound assess characteristics and neovascularization, respectively, of the carotid plaque. The purpose of the present study was to clarify how findings of contrast-enhanced ultrasound plaque imaging are related to those of 3-dimensional (3D) fast spin echo (FSE) T1-weighted MR plaque imaging (WI) in severe stenosis (≥70%) of the cervical carotid artery. METHODS: Fifty-three patients underwent 3D FSE T1-WI and contrast-enhanced ultrasound...
July 14, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28699518/nano-sized-ultrasound-contrast-agents-for-cancer-therapy-and-theranostics
#3
Hao Li, Shenglong Gan, Shi-Ting Feng, Guofu Zhou, Zhi Dong, Rongqin Zheng, Zi-Ping Li
Ultrasound contrast agents (UCA) represented by gas-filled microbubble, can provide simultaneous and co-localized enhancement on image contrast to help disease diagnosis by highlighting tissue borders. Nowadays, Some UCAs (e.g. Levovist®, Optison®, Definity®, and Sonovue®) are commercially available, and have been clinically utilized for enhanced ultrasonography in the US, Canada, Europe, Asia and so on. However, their large diameters (1~10 μm) mainly hinder more precise and deeper applications in the imaging of capillary-abundant organs or tissues (e...
July 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28698601/characteristics-of-sonography-in-a-rat-achilles-tendinopathy-model-possible-non-invasive-predictors-of-biomechanics
#4
Su-Ya Lee, Hsiao-Feng Chieh, Chien-Ju Lin, I-Ming Jou, Yung-Nien Sun, Li-Chieh Kuo, Po-Ting Wu, Fong-Chin Su
The purpose of this study was to investigate the dynamic changes of histopathology, biomechanical properties, echo intensity, and ultrasound features in a collagenase-induced tendinopathy model of rat Achilles tendons, and to examine the associations among biomechanical properties, echo intensity, and ultrasound features. Forty-two rats received an ultrasound-guided collagenase injection on their left Achilles tendons, and needle puncture on the right ones as the control. At four, eight, and twelve weeks post-injury, the tendons were examined via measurements of their biomechanical properties, histopathological and ultrasonographic characteristics...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692129/distortion-free-diffusion-mri-using-an-mri-guided-tri-cobalt-60-radiotherapy-system-sequence-verification-and-preliminary-clinical-experience
#5
Yu Gao, Fei Han, Ziwu Zhou, Minsong Cao, Tania Kaprealian, Mitchell Kamrava, Chenyang Wang, John Neylon, Daniel A Low, Yingli Yang, Peng Hu
PURPOSE: Monitoring tumor response during the course of treatment and adaptively modifying treatment plan based on tumor biological feedback may represent a new paradigm for radiotherapy. Diffusion MRI has shown great promises in assessing and predicting tumor response to radiotherapy. However, the conventional diffusion-weighted single-shot echo-planar-imaging (DW-ssEPI) technique suffers from limited resolution, severe distortion and possibly inaccurate ADC at low field strength. The purpose of this work is to develop a reliable, accurate and distortion-free diffusion MRI technique that is practicable for longitudinal tumor response evaluation and adaptive radiotherapy on a 0...
July 10, 2017: Medical Physics
https://www.readbyqxmd.com/read/28687915/revised-propeller-for-t2-weighted-imaging-of-the-prostate-at-3-tesla-impact-on-lesion-detection-and-pi-rads-classification
#6
Michael Meier-Schroers, Christian Marx, Frederic Carsten Schmeel, Karsten Wolter, Jürgen Gieseke, Wolfgang Block, Alois Martin Sprinkart, Frank Traeber, Winfried Willinek, Hans Heinz Schild, Guido Matthias Kukuk
PURPOSE: To evaluate revised PROPELLER (RevPROP) for T2-weighted imaging (T2WI) of the prostate as a substitute for turbo spin echo (TSE). MATERIALS AND METHODS: Three-Tesla MR images of 50 patients with 55 cancer-suspicious lesions were prospectively evaluated. Findings were correlated with histopathology after MRI-guided biopsy. T2 RevPROP, T2 TSE, diffusion-weighted imaging, dynamic contrast enhancement, and MR-spectroscopy were acquired. RevPROP was compared to TSE concerning PI-RADS scores, lesion size, lesion signal-intensity, lesion contrast, artefacts, and image quality...
July 7, 2017: European Radiology
https://www.readbyqxmd.com/read/28687301/reproducibility-of-ultrasound-derived-muscle-thickness-and-echo-intensity-for-the-entire-quadriceps-femoris-muscle
#7
R Santos, P A S Armada-da-Silva
INTRODUCTION: Muscle thickness (MT) and muscle echo-intensity (EI) allow the study of skeletal muscle adaptive changes with ultrasound. This study investigates the intra- and inter-session reliability and agreement of MT and EI measurements for each of the four heads of the quadriceps femoris in transverse and longitudinal scans, using two sizes for the region of interest (ROI); EI measurements only. METHODS: Three B-mode images from two views were acquired from each head of quadriceps femoris from twenty participants (10 females) in two sessions, 7 days apart...
August 2017: Radiography
https://www.readbyqxmd.com/read/28678084/magnetic-resonance-lymphography-at-9-4-t-using-a-gadolinium-based-nanoparticle-in-rats-investigations-in-healthy-animals-and-in-a-hindlimb-lymphedema-model
#8
Andreas Müller, Peter Fries, Bijan Jelvani, François Lux, Claudia E Rübe, Stephanie Kremp, Pietro Giovanoli, Arno Buecker, Michael D Menger, Matthias W Laschke, Florian S Frueh
OBJECTIVES: Magnetic resonance lymphography (MRL) in small animals is a promising but challenging tool in preclinical lymphatic research. In this study, we compared the gadolinium (Gd)-based nanoparticle AGuIX with Gd-DOTA for interstitial MRL in healthy rats and in a chronic rat hindlimb lymphedema model. MATERIALS AND METHODS: A comparative study with AGuIX and Gd-DOTA for interstitial MRL was performed in healthy Lewis rats (n = 6). For this purpose, 75 μL of 3 mM AGuIX (containing 30 mM Gd-DOTA side residues) and 75 μL 30 mM Gd-DOTA were injected simultaneously in the right and left hindlimbs...
July 3, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28677254/partial-volume-model-for-brain-mri-scan-using-mp2rage
#9
Quentin Duché, Hervé Saint-Jalmes, Oscar Acosta, Parnesh Raniga, Pierrick Bourgeat, Vincent Doré, Gary F Egan, Olivier Salvado
MP2RAGE is a T1 weighted MRI sequence that estimates a composite image providing much reduction of the receiver bias, has a high intensity dynamic range, and provides an estimate of T1 mapping. It is, therefore, an appealing option for brain morphometry studies. However, previous studies have reported a difference in cortical thickness computed from MP2RAGE compared with widely used Multi-Echo MPRAGE. In this article, we demonstrated that using standard segmentation and partial volume estimation techniques on MP2RAGE introduces systematic errors, and we proposed a new model to estimate partial volume of the cortical gray matter...
July 5, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28676289/differential-characteristics-of-skeletal-muscle-in-community-dwelling-older-adults
#10
Minoru Yamada, Yosuke Kimura, Daisuke Ishiyama, Naohito Nishio, Yuki Abe, Tomohiro Kakehi, Junko Fujimoto, Tomoya Tanaka, Shunsuke Ohji, Yuhei Otobe, Shingo Koyama, Yukiko Okajima, Hidenori Arai
BACKGROUND: Sarcopenia is diagnosed on the basis of skeletal muscle mass and muscle strength/function. However, more simple and accurate measures for muscle mass and muscle strength/function should be explored. OBJECTIVE: The aim of this study was to compare the skeletal muscle characteristics at each stage of sarcopenia (normal, presarcopenia, dynapenia, and sarcopenia) via ultrasonography, multifrequency bioelectrical impedance analysis (BIA), and physical assessment batteries in community-dwelling older adults...
July 1, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28674916/-2-h-13-c-correlation-solid-state-nmr-for-investigating-dynamics-and-water-accessibilities-of-proteins-and-carbohydrates
#11
Martin D Gelenter, Tuo Wang, Shu-Yu Liao, Hugh O'Neill, Mei Hong
Site-specific determination of molecular motion and water accessibility by indirect detection of (2)H NMR spectra has advantages over dipolar-coupling based techniques due to the large quadrupolar couplings and the ensuing high angular resolution. Recently, a Rotor Echo Short Pulse IRrAdiaTION mediated cross polarization ((RESPIRATION)CP) technique was developed, which allowed efficient transfer of (2)H magnetization to (13)C at moderate (2)H radiofrequency field strengths available on most commercial MAS probes...
July 3, 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28672985/comparison-of-diagnostic-values-of-ultrasound-micro-flow-imaging-and-contrast-enhanced-ultrasound-for-neovascularization-in-carotid-plaques
#12
Hongxue Zhang, Jianwen Du, Hong Wang, Haili Wang, Jianhui Jiang, Jingjie Zhao, Huan Lu
The aim of the present study was to compare the diagnostic values of ultrasound micro-flow imaging (SMI) and contrast-enhanced ultrasound (CEUS) for neovascularization in carotid plaques, and to investigate their capacities for predicting the risks of cerebral stroke. A total of 39 patients (64 carotid plaques) with severe carotid artery stenosis undergoing carotid endarterectomy were selected between February 2015 and February 2016, and SMI and CEUS were used to detect neovascularization in plaques. According to the CEUS dynamic graph of plaques, the enhanced intensity visual scales and contrast parameters were obtained...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28670779/quantitative-ultrasound-assessment-of-myofascial-pain-syndrome-affecting-the-trapezius-a-reliability-study
#13
Dinesh Kumbhare, Saurabh Shaw, Liza Grosman-Rimon, Michael D Noseworthy
OBJECTIVES: Myofascial pain syndrome is one of the most common causes of chronic pain and is highlighted by the presence of myofascial trigger points. The current practice of diagnosing myofascial pain syndrome among clinicians involves manual detection of myofascial trigger points, which can be inconsistent. However, the detection process can be strengthened with the assistance of ultrasound (US). Therefore, this study aimed to characterize the upper trapezius by using quantitative techniques in healthy asymptomatic individuals with neck pain...
July 3, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28670165/efficacy-of-maximum-intensity-projection-of-contrast-enhanced-3d-turbo-spin-echo-imaging-with-improved-motion-sensitized-driven-equilibrium-preparation-in-the-detection-of-brain-metastases
#14
Yun Jung Bae, Byung Se Choi, Kyung Mi Lee, Yeon Hong Yoon, Leonard Sunwoo, Cheolkyu Jung, Jae Hyoung Kim
OBJECTIVE: To evaluate the diagnostic benefits of 5-mm maximum intensity projection of improved motion-sensitized driven-equilibrium prepared contrast-enhanced 3D T1-weighted turbo-spin echo imaging (MIP iMSDE-TSE) in the detection of brain metastases. The imaging technique was compared with 1-mm images of iMSDE-TSE (non-MIP iMSDE-TSE), 1-mm contrast-enhanced 3D T1-weighted gradient-echo imaging (non-MIP 3D-GRE), and 5-mm MIP 3D-GRE. MATERIALS AND METHODS: From October 2014 to July 2015, 30 patients with 460 enhancing brain metastases (size > 3 mm, n = 150; size ≤ 3 mm, n = 310) were scanned with non-MIP iMSDE-TSE and non-MIP 3D-GRE...
July 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28667252/nanoscale-rheology-at-solid-complex-fluid-interfaces
#15
Sebastian Jaksch, Olaf Holderer, Manuchar Gvaramia, Michael Ohl, Michael Monkenbusch, Henrich Frielinghaus
Here we present an approach to measure dynamic membrane properties of phospholipid membranes close to an interface. As an example we show results of the membrane dynamics of a phospholipid membrane multilayer-stack on a solid substrate (silicon). On this sample we were able to measure local interaction and friction parameters using Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES), where an evanescent neutron wave probes the fluctuations close to a rigid interface. With this method it is possible to access length scales in the nano to micrometer region as well as energies in the μeV range...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28666972/non-destructive-nir-spectral-imaging-assessment-of-bone-water-comparison-to-mri-measurements
#16
Chamith S Rajapakse, Mugdha V Padalkar, Hee Jin Yang, Mikayel Ispiryan, Nancy Pleshko
Bone fracture risk increases with age, disease states, and with use of certain therapeutics, such as acid-suppressive drugs, steroids and high-dose bisphosphonates. Historically, investigations into factors that underlie bone fracture risk have focused on evaluation of bone mineral density (BMD). However, numerous studies have pointed to factors other than BMD that contribute to fragility, including changes in bone collagen and water. The goal of this study is to investigate the feasibility of using near infrared spectral imaging (NIRSI) to determine the spatial distribution and relative amount of water and organic components in whole cross-sections of bone, and to compare those results to those obtained using magnetic resonance imaging (MRI) methods...
June 28, 2017: Bone
https://www.readbyqxmd.com/read/28666879/correction-of-metal-induced-susceptibility-artifacts-for-functional-mri-during-deep-brain-stimulation
#17
Myung-Ho In, Shinho Cho, Yunhong Shu, Hoon-Ki Min, Matt A Bernstein, Oliver Speck, Kendall H Lee, Hang Joon Jo
Functional magnetic resonance imaging (fMRI) is an emerging tool for investigating brain activation associated with, or modulated by, deep brain stimulation (DBS). However, DBS-fMRI generally suffers from severe susceptibility to artifacts in regions near the metallic stimulation electrodes, as well as near tissue/air boundaries of the brain. These result in strong intensity and geometric distortions along the phase-encoding (PE) (i.e., blipped) direction in gradient-echo echo-planar imaging (GE-EPI). Distortion presents a major challenge to conducting reliable data analysis and in interpreting the findings...
June 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/28663640/sonographic-evaluation-of-internal-jugular-vein-diameter-and-cross-sectional-area-measurements-in-correlation-with-left-ventricular-end-diastolic-area-as-a-tool-for-perioperative-assessment-of-volume-status-in-pediatric-patients-undergoing-cardiac-surgery
#18
Wafaa Mohamed Elsadek, Amal Hanfy Abo Elaela, Heba Mohamed Nassar, Mohamed Maher Kamel, Ahmed Abdelaziz Mohamed, Hassan Mohamed Ali
AIM: The aim of this study is to compare the ultrasound estimation of the cross-sectional area (CSA) and diameter of internal jugular vein (IJV) with left ventricular end diastolic area (LVEDA) for the assessment of intravascular volume in pediatric patients during cardiac surgery. PATIENTS AND METHODS: The CSA and diameter of the left IJV were defined, using ultrasound machine, and compared with LVEDA, estimated by transesophageal echo, in four times intervals (immediately after induction [T1], before the start of cardiopulmonary bypass [CPB] [T2], immediately after weaning of CPB [T3], and at the end of surgery before transfer to the Intensive Care Unit [T4]) as a tool for intravascular volume assessment in 16 pediatric patients undergoing cardiac surgery...
April 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28661067/medial-prefrontal-cortex-deficits-correlate-with-unrefreshing-sleep-in-patients-with-chronic-fatigue-syndrome
#19
Zack Y Shan, Richard Kwiatek, Richard Burnet, Peter Del Fante, Donald R Staines, Sonya M Marshall-Gradisnik, Leighton R Barnden
Unrefreshing sleep is a hallmark of chronic fatigue syndrome/myalgic encephalomyelitis (CFS). This study examined brain structure variations associated with sleep quality in patients with CFS. 38 patients with CFS (34.8 ± 10.1 years old) and 14 normal controls (NCs) (34.7 ± 8.4 years old) were recruited. All subjects completed the Hospital Anxiety and Depression Scale, Pittsburgh Sleep Quality Index (PSQI), and Chalder Fatigue Scale (CFQ) questionnaires. Brain MRI measures included global and regional grey and white matter volumes, magnetization transfer T1 weighted (MT-T1w) intensities, and T1 weighted (T1w) and T2 weighted spin echo signal intensities...
June 29, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28653477/radiomic-analysis-of-soft-tissues-sarcomas-can-distinguish-intermediate-from-high-grade-lesions
#20
Valentina D A Corino, Eros Montin, Antonella Messina, Paolo G Casali, Alessandro Gronchi, Alfonso Marchianò, Luca T Mainardi
PURPOSE: To assess the feasibility of grading soft tissue sarcomas (STSs) using MRI features (radiomics). MATERIALS AND METHODS: MRI (echo planar SE, 1.5T) from 19 patients with STSs and a known histological grading, were retrospectively analyzed. The apparent diffusion coefficient (ADC) maps, obtained by diffusion-weighted imaging acquisitions, were analyzed through 65 radiomic features, intensity-based (first order statistics, FOS) and texture (gray level co-occurrence matrix, GLCM; and gray level run length matrix, GLRLM) features...
June 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
keyword
keyword
9521
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"