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Echo intensity

Tsuyoshi Matsuda, Hirohiko Kimura, Hiroyuki Kabasawa, Masayuki Kanamoto
On arterial spin-labeled (ASL) images, areas of bright intravascular signal will appear when the post labeling delay time is shorter than arterial transit time. Vascular suppression (VS) schemes reduce artefactual bright signal by dephasing intravascular labeled spins. However, existing VS methods, such as Motion-Sensitized Driven-Equilibrium (MSDE), decrease the uniformity of the signal intensity distribution and extend the echo time. The purpose of this study is to compare VS using a Delays Alternating with Nutation for Tailored Excitation (DANTE) preparation pulse, with MSDE for ASL imaging on a flow phantom and volunteer data...
February 12, 2018: Magnetic Resonance Imaging
Olivier Chevallier, Nan Zhou, Jian He, Romaric Loffroy, Yì Xiáng J Wáng
Background It has been reported that intravoxel incoherent motion (IVIM) diffusion magnetic resonance imaging (MRI) scan-rescan reproducibility is unsatisfactory. Purpose To study IVIM MRI parameter reproducibility for liver parenchyma after the removal of motion-contaminated and/or poorly fitted image data. Material and Methods Eighteen healthy volunteers had liver scans twice in the same session to assess scan-rescan repeatability, and again in another session after an average interval of 13 days to assess reproducibility...
January 1, 2018: Acta Radiologica
Francesco Cenni, Simon-Henri Schless, Lynn Bar-On, Erwin Aertbeliën, Herman Bruyninckx, Britta Hanssen, Kaat Desloovere
BACKGROUND AND OBJECTIVE: 3D freehand Ultrasonography is a medical imaging technique that can be used to measure muscle and tendon morphological and structural properties, including volume, lengths and echo-intensity. These properties are clinically relevant in neurological disorders such as spastic cerebral palsy to monitor disease progression and evaluate the effect of treatment. This study presents a methodology for extracting these parameters along with a clinical reliability analysis for the data acquisition and processing...
March 2018: Computer Methods and Programs in Biomedicine
Jonathan Daniel Miller, Adam J Sterczala, Michael A Trevino, Trent J Herda
OBJECTIVES: Examine differences between normal weight (NW) and overweight (OW) children aged 8 to 10 years in strength, muscle composition, and motor unit (MU) behavior of the first dorsal interosseous (FDI). METHODS: Ultrasonography determined muscle cross-sectional area (CSA), subcutaneous fat (sFAT), and echo intensity (EI). MU behavior was assessed during isometric muscle actions at 20% and 50% of maximal voluntary contraction (MVC) by analyzing EMG amplitude (EMGRMS) and relationships between mean firing rates (MFR), recruitment thresholds (RT), MU action potential amplitudes (MUAPSIZE) and durations (MUAPTIME)...
February 7, 2018: Journal of Neurophysiology
Masashi Hirooka, Yohei Koizumi, Teruki Miyake, Takao Watanabe, Osamu Yoshida, Yoshio Tokumoto, Atsushi Yukimoto, Yoshiko Nakamura, Yusuke Imai, Masanori Abe, Yoichi Hiasa
A change in hepatic blood flow caused by the hepatic arterial buffer response (HABR) occurs as fatty liver disease progress. The aim of this longitudinal cohort study was to investigate whether fatty liver with the HABR induces metabolic disorders. In 2009 and 2010, 494 (89.5%) participants were enrolled. The median follow-up duration was 5.0 (interquartile range, 3.9-6.0) years. The hazard ratios of fatty liver with the HABR for incident metabolic disorders were assessed by Cox proportional hazard models. A non-fatty liver group (non-FL group, hepatorenal echo intensity ratio <1...
September 2017: Hepatology Communications
Gitte H Koksvik
The article is based on ethnographic observation and semistructured interviews with personnel in three European adult intensive care units. Intensive care is a domain of contemporary biomedicine centered on invasive and intense efforts to save lives in acute, critical conditions. It echoes our culture's values of longevity. Nevertheless, mortality rates are elevated. Many deaths follow from nontreatment decisions. Medicalized dying in technological medical settings are often presented as unnatural, impersonal, and undesirable ways of dying...
January 1, 2018: Omega
Deepak Sharma, Nazanin Farahbakhsh, Seyyed Ahmad Tabatabaii
Central catheters are known as "life lines" in intensive care units and are used frequently in neonatal intensive care unit (NICU) for multiple indications. The central catheters used in NICU includes umbilical venous catheter (UVC), umbilical arterial catheter (UAC) and peripherally inserted central catheter (PICC) lines. The tip of these central lines need to be in correct position as malpositioned central line tips leads to many neonatal complications. Radiograph either abdomen or chest is the most widely used modality for locating the tip of central catheter...
February 4, 2018: Journal of Maternal-fetal & Neonatal Medicine
Clarissa M Brusco, Anthony J Blazevich, Regis Radaelli, Cintia E Botton, Eduardo L Cadore, Bruno M Baroni, Gabriel S Trajano, Ronei S Pinto
Adaptations to 6 weeks of supervised hamstring stretching training and its potential impact on symptoms of eccentric exercise-induced muscle damage (EIMD) were studied in 10 young, untrained men with limited hamstrings flexibility. Participants performed unilateral flexibility training (experimental leg; EL) on an isokinetic dynamometer while the contralateral limb acted as control (CL). Hip range of motion (ROM), passive, isometric and concentric torques, active optimum angle, and biceps femoris and semitendinosus muscle thickness and ultrasound echo intensity were assessed both before and after the training...
February 3, 2018: Scandinavian Journal of Medicine & Science in Sports
Hongyi Li, Lin Liu, Qinglei Shi, Alto Stemmer, Hong Zeng, Yi Li, Mengchao Zhang
To compare the detection of bladder neoplasms and image quality among the diffusion-weighted imaging (DWI) acquired by the prototype single-shot echo-planar-imaging (ss-EPI) sequence for integrated slice-specific dynamic shimming (iShim), readout segmentation of long variable echo trains (RESOLVE) and conventional ss-EPI sequences.Around 63 patients with 77 bladder lesions were enrolled. The MR protocol included T1WI, T2WI and 3 types of DWI. The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of each DWI for the detection of bladder tumor were computed...
December 2017: Medicine (Baltimore)
Zhe Wu, Berkin Bilgic, Hongjian He, Qiqi Tong, Yi Sun, Yiping Du, Kawin Setsompop, Jianhui Zhong
PURPOSE: This study introduces a highly accelerated whole-brain direct visualization of short transverse relaxation time component (ViSTa) imaging using a wave controlled aliasing in parallel imaging (CAIPI) technique, for acquisition within a clinically acceptable scan time, with the preservation of high image quality and sufficient spatial resolution, and reduced residual point spread function artifacts. METHODS: Double inversion RF pulses were applied to preserve the signal from short T1 components for directly extracting myelin water signal in ViSTa imaging...
February 1, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Joo Yeon Lee, Byeong Seong Kang, Hyun Seok Shim, In Hye Song, Misung Kim, Sang Hoon Lee, Hye Won Chung, Min Hee Lee, Myung Jin Shin
OBJECTIVES: The purpose of this study was to evaluate the imaging features of clear cell hidradenoma on ultrasonography (US), computed tomography (CT), and magnetic resonance imaging (MRI). METHODS: The radiologic and pathologic databases at 2 medical institutions were searched retrospectively from 2004 to 2016 to identify patients with a diagnosis of clear cell hidradenoma. Ultrasonographic, CT, and MRI features were described, and pathologic specimens were reviewed...
February 1, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Maurizio Giacchino, Cristina Caresio, Negar E Gorji, Filippo Molinari, Giuseppe Massazza, Marco Alessandro Minetto
Background: Ultrasonographic abnormalities of the patellar tendon frequently occur in asymptomatic athletes and it is not always clear whether they precede (and may predict) the development of tendinopathy. Objective: This study aimed to investigate by ultrasonography the prevalence of patellar tendon abnormalities in players of "pallapugno" and to establish whether structural tendon abnormalities predict tendinopathy development. Methods: Ultrasound B-mode images of the patellar tendon of both sides were acquired in fourteen throwers...
July 2017: Muscles, Ligaments and Tendons Journal
Yuyao Zhang, Hongjiang Wei, Yawen Sun, Matthew J Cronin, Naying He, Jianrong Xu, Yan Zhou, Chunlei Liu
BACKGROUND: Quantitative susceptibility mapping (QSM) offers a consistent hemorrhage volume measurement independent of imaging parameters. PURPOSE: To investigate the magnetic susceptibility of intracerebral hemorrhage (ICH) as a quantitative measurement for monitoring treatment in hematoma patients. STUDY TYPE: Prospective. POPULATION: Twenty-six patients with acute ICH were recruited and enrolled in treatment including surgery or medication (mannitol) for 1 week...
January 30, 2018: Journal of Magnetic Resonance Imaging: JMRI
Pierre Bour, Valéry Ozenne, Fabrice Marquet, Baudouin Denis de Senneville, Erik Dumont, Bruno Quesson
INTRODUCTION: MRgHIFU treatments of mobile organs require locking the HIFU beam on the targeted tissue to maximize heating efficiency. We propose to use a standalone 3D ultrasound-based motion correction technique using the HIFU transducer in pulse-echo mode. Validation of the method was performed in vitro and in vivo in the liver of pig under MR-Thermometry. METHODS: 3D-motion estimation was implemented using ultrasonic speckle-tracking between consecutive acquisitions...
January 29, 2018: International Journal of Hyperthermia
Matthew D Zinn, Michael J Wallendorf, Kathleen E Simpson, Ashley D Osborne, James K Kirklin, Charles E Canter
Data are lacking on RSB intensity and outcomes after pediatric heart transplantation. PHTS centers received a survey on RSB practices from 2005 to present. PHTS data were obtained for 2010-2013 and integrated with center-matched survey responses for analysis. Survey response rate was 82.6% (38/46). Centers were classified as low-, moderate-, and high-intensity programs based on RSB frequency (0-more than 8 RSB/y). RSB intensity decreased with increasing time from HT. Age at HT impacted RSB intensity mostly in year 1, with little to no impact in later years...
January 29, 2018: Pediatric Transplantation
Yang Li, Deng Mao, Zhiqiang Li, Michael Schär, Jay J Pillai, James G Pipe, Hanzhang Lu
PURPOSE: Arterial-spin-labeling (ASL) magnetic resonance imaging (MRI) is intrinsically a low signal-to-noise ratio (SNR) technique. This study aims to enhance its sensitivity by quantifying physiological noise attributed to cardiac pulsation and devising an improved sequence, cardiac-triggered ASL, to minimize this noise. METHODS: A total of 16 healthy subjects were studied on a 3 Tesla MRI system. The influence of cardiac pulsation on pseudo-continuous ASL (pCASL) signal was first investigated by performing a regular pCASL sequence while the cardiac phase of the image acquisition was recorded by a pulse oximeter...
January 25, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Akash Shukla, Pratin Bhatt, Deepak Kumar Gupta, Tejas Modi, Jatin Patel, Milind Phadke, Krantikumar Rathod, Megha Meshram, S J Bhatia
BACKGROUND AND AIM: Cirrhotic cardiomyopathy (CCM) is associated with high mortality after transjugular intrahepatic portosystemic shunt (TIPS) and liver transplantation in patients with cirrhosis. There is no data about the prevalence or impact of CCM in Budd-Chiari syndrome (BCS). We assessed the prevalence of CCM in patients with BCS and its impact on outcome after radiological intervention. METHODS: Thirty-three consecutive patients with BCS (15 men) and 33 controls with hepatitis B-related cirrhosis (18 men, matched for Child-Pugh score) were evaluated with baseline electrocardiography (ECG), echocardiography (ECHO) and dobutamine stress ECHO, and ECG (DSE)...
January 24, 2018: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
Héctor Estrada, Xiao Huang, Johannes Rebling, Michael Zwack, Sven Gottschalk, Daniel Razansky
Ultrasound-mediated transcranial images of the brain often suffer from acoustic distortions produced by the skull bone. In high-resolution optoacoustic microscopy, the skull-induced acoustic aberrations are known to impair image resolution and contrast, further skewing the location and intensity of the different absorbing structures. We present a virtual craniotomy deconvolution algorithm based on an ultrasound wave propagation model that corrects for the skull-induced distortions in optically-resolved optoacoustic transcranial microscopy data...
January 23, 2018: Scientific Reports
Hironobu Endo, Kenji Sekiguchi, Hitoshi Shimada, Takehiro Ueda, Hisatomo Kowa, Fumio Kanda, Tatsushi Toda
There is no reliable objective indicator for upper motor neuron dysfunction in amyotrophic lateral sclerosis (ALS). To determine the clinical significance and potential utility of magnetic resonance (MR) signals, we investigated the relationship between clinical symptoms and susceptibility changes in the motor cortex measured using susceptibility-weighted MR imaging taken by readily available 3-T MRI in clinical practice. Twenty-four ALS patients and 14 control subjects underwent 3-T MR T1-weighted imaging and susceptibility-weighted MR imaging with the principles of echo-shifting with a train of observations (PRESTO) sequence...
January 22, 2018: Journal of Neurology
Soon Ho Yoon, Chanhee Lee, Jinil Park, Jin Mo Goo, Jang-Yeon Park
Objective: To preliminarily evaluate technical feasibility of a dual-echo ultrashort echo time (UTE) subtraction MR imaging by using concurrent dephasing and excitation (CODE) sequence for visualization of iron-oxide enhancement in focal inflammatory pulmonary lesions. Materials and Methods: A UTE pulmonary MR imaging before and after the injection of clinically usable superparamagnetic iron-oxide nanoparticles, ferumoxytol, was conducted using CODE sequence with dual echo times of 0...
January 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
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