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https://www.readbyqxmd.com/read/29217244/intraoperative-transesophageal-and-postoperative-transthoracic-echocardiographic-evaluation-of-a-mechanical-heart-valve-prosthesis-implanted-at-aortic-position
#1
Saravana Babu, Rupa Sreedhar, Shrinivas V Gadhinglajkar, Prasanta Kumar Dash, Subin Sukesan, Vivek Pillai, Varghese T Panicker, Lovhale Pravin Shriram, Neelam Aggarwal
OBJECTIVE: The aims of this study were to evaluate the intraoperative transesophageal echocardiographic (iTEE) characteristics and Doppler flow profile of aortic Chitra heart valve prosthesis (CHVP) under stable hemodynamic and loading conditions, and to compare and correlate the iTEE data with the postoperative transthoracic echocardiography (TTE) data obtained at 48 hours (TTE1) and 3 months (TTE2) after the surgery. DESIGN: Prospective, observational study. SETTING: University-level tertiary referral hospital...
September 6, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29211878/normal-reference-values-of-multilayer-longitudinal-strain-according-to-age-decades-in-a-healthy-population-a-single-centre-experience
#2
Gian Marco Alcidi, Roberta Esposito, Vincenzo Evola, Ciro Santoro, Maria Lembo, Regina Sorrentino, Francesco Lo Iudice, Francesco Borgia, Giuseppina Novo, Bruno Trimarco, Patrizio Lancellotti, Maurizio Galderisi
Aims: Recent advancements in echocardiographic technology allow to analyse myocardial strain in multiple layers. Little is known about the impact of age on layer-specific longitudinal strain in healthy subjects. The aim of this study was to analyse the influence of age on multilayer longitudinal strain and establish normal reference values of layer-specific strain according to age decades in a healthy population referring to our echo laboratory using 2D speckle-tracking echocardiography with layer-specific software...
December 2, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29204171/magnetic-resonance-imaging-metal-artifact-reduction-for-eye-plaque-patient-with-dental-braces
#3
H Michael Gach, Stacie L Mackey, Sana Rehman, Mo Kadbi, Jacqueline E Zoberi, Jose Garcia-Ramirez, Perry W Grigsby
Purpose: To determine if metal artifact reduction can minimize magnetic susceptibility artifacts in the orbits for an eye plaque brachytherapy patient with metallic dental braces. Material and methods: A 62-year-old female patient with a choroidal melanoma in the right eye received a 1.5 T magnetic resonance imaging (MRI) simulation for 3D eye plaque brachytherapy planning. The protocol included conventional 3D T1-weighted and 2D T2-weighted MRIs. A vendor-supplied T2-weighted metal artifact reduction sequence was added to the protocol to reduce magnetic susceptibility artifacts from the metallic dental braces...
October 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/29202776/-image-navigated-3-dimensional-late-gadolinium-enhancement-cardiovascular-magnetic-resonance-imaging-feasibility-and-initial-clinical-results
#4
Konstantinos Bratis, Markus Henningsson, Chrysanthos Grigoratos, Matteo Dell'Omodarme, Konstantinos Chasapides, Rene Botnar, Eike Nagel
BACKGROUND: Image-navigated 3-dimensional late gadolinium enhancement (iNAV-3D LGE) is an advanced imaging technique that allows for direct respiratory motion correction of the heart. Its feasibility in a routine clinical setting has not been validated. METHODS: Twenty-three consecutive patients referred for cardiovascular magnetic resonance (CMR) examination including late gadolinium enhancement (LGE) imaging were prospectively enrolled. Image-navigated free-breathing 3-dimensional (3D) T1-weighted gradient-echo LGE and two-dimensional (2D LGE) images were acquired in random order on a 1...
December 4, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29193244/an-efficient-sequence-for-fetal-brain-imaging-at-3t-with-enhanced-t1-contrast-and-motion-robustness
#5
Giulio Ferrazzi, Anthony N Price, Rui Pedro A G Teixeira, Lucilio Cordero-Grande, Jana Hutter, Ana Gomes, Francesco Padormo, Emer Hughes, Torben Schneider, Mary Rutherford, Maria Kuklisova Murgasova, Joseph V Hajnal
PURPOSE: Ultrafast single-shot T2 -weighted images are common practice in fetal MR exams. However, there is limited experience with fetal T1 -weighted acquisitions. This study aims at establishing a robust framework that allows fetal T1 -weighted scans to be routinely acquired in utero at 3T. METHODS: A 2D gradient echo sequence with an adiabatic inversion was optimized to be robust to fetal motion and maternal breathing optimizing grey/white matter contrast at the same time...
November 28, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29191613/abnormal-biventricular-performance-in-asymptomatic-adolescents-late-after-repaired-tetralogy-of-fallot-combined-two-dimensional-speckle-tracking-and-three-dimensional-echocardiography-study
#6
Ken-Pen Weng, Yu-Chi Hung, Shih-Hui Huang, Huang-Wei Wu, Kuang-Jen Chien, Chu-Chuan Lin, Hsu-Hsia Peng, Ming-Ting Wu
BACKGROUND: The aim of this prospective study was to assess biventricular performance in asymptomatic adolescents with repaired tetralogy of Fallot (TOF) using 2D speckle tracking and real time 3D echocardiography simultaneously. METHODS: We studied 31 patients with repaired TOF (M/F: 22/9, age: 16.1 ± 6.1 yrs) who had history of cardiac surgery with mean follow-up duration of 12.8 years, and 32 age- and sex-matched normal individuals (M/F: 23/9, age: 16.6 ± 5...
November 27, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29175470/a-comparison-of-readout-segmented-epi-and-interleaved-epi-in-high-resolution-diffusion-weighted-imaging
#7
Yishi Wang, Xiaodong Ma, Zhe Zhang, Erpeng Dai, Ha-Kyu Jeong, Bin Xie, Chun Yuan, Hua Guo
PURPOSE: To provide a comprehensive understanding of multi-shot EPI diffusion imaging methods by comparing Readout segmented EPI (RS-EPI) and interleaved EPI (iEPI). MATERIALS AND METHODS: RS-EPI and iEPI were compared on the same 3T scanner. A 2D navigator was used for both RS-EPI and iEPI for phase correction. Signal to noise ratio (SNR), fractional anisotropy (FA) and distortion level were compared using phantom data. Distortion reduction capability and scan efficiency were compared with different protocols with simulations...
November 23, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29148586/a-dynamic-ultrasound-simulation-of-a-pulsating-three-layered-cca-for-validation-of-2d-wall-motion-and-blood-velocity-estimation-algorithms
#8
Xiao Hu, Yufeng Zhang, Guanghui Cai, Kexin Zhang, Li Deng, Lian Gao, Suya Han, Jianhua Chen
PURPOSE: A dynamic ultrasound simulation model for the common carotid artery (CCA) with three arterial layers for validation of 2D wall motion and blood velocity estimation algorithms is proposed in present study. This model describes layers with not only characteristics of echo distributions conforming to clinical ones, but also varying thicknesses, axial and radial displacements with pulsatile blood pressure during a cardiac cycle. METHODS: The modeling process is as follows: first, a geometrical model according with the clinical structure size of a CCA is built based on the preset layer thicknesses and the diameter of lumen...
November 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/29125850/1-5-versus-3-versus-7-tesla-in-abdominal-mri-a-comparative-study
#9
Anja Laader, Karsten Beiderwellen, Oliver Kraff, Stefan Maderwald, Karsten Wrede, Mark E Ladd, Thomas C Lauenstein, Michael Forsting, Harald H Quick, Kai Nassenstein, Lale Umutlu
OBJECTIVES: The aim of this study was to investigate and compare the feasibility as well as potential impact of altered magnetic field properties on image quality and potential artifacts of 1.5 Tesla, 3 Tesla and 7 Tesla non-enhanced abdominal MRI. MATERIALS AND METHODS: Magnetic Resonance (MR) imaging of the upper abdomen was performed in 10 healthy volunteers on a 1.5 Tesla, a 3 Tesla and a 7 Tesla MR system. The study protocol comprised a (1) T1-weighted fat-saturated spoiled gradient-echo sequence (2D FLASH), (2) T1-weighted fat-saturated volumetric interpolated breath hold examination sequence (3D VIBE), (3) T1-weighted 2D in and opposed phase sequence, (4) True fast imaging with steady-state precession sequence (TrueFISP) and (5) T2-weighted turbo spin-echo (TSE) sequence...
2017: PloS One
https://www.readbyqxmd.com/read/29123458/comparison-of-mri-sequences-in-ideal-fiducial-maker-based-radiotherapy-for-prostate-cancer
#10
Osamu Tanaka, Hisao Komeda, Mitsuyoshi Hattori, Shigeki Hirose, Eiichi Yama, Masayuki Matsuo
Aim: Prostate contouring using CT alone is difficult. To overcome the uncertainty, CT/MRI registration using a fiducial marker is generally performed. However, visualization of the marker itself can be difficult with MRI. This study aimed to determine the optimal MRI pulse sequence for defining the marker as well as the prostate outline among five sequences. Materials and methods: A total of 21 consecutive patients with prostate cancer were enrolled. Two gold fiducial markers were placed before CT/MRI examination...
November 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29121397/virtual-phantom-magnetic-resonance-imaging-vip-mri-on-a-clinical-mri-platform
#11
Hervé Saint-Jalmes, Alejandro Bordelois, Giulio Gambarota
PURPOSE: To implement Virtual Phantom Magnetic Resonance Imaging (ViP MRI), a technique that allows for generating reference signals in MR images using radiofrequency (RF) signals, on a clinical MR system and to test newly designed virtual phantoms. METHODS: MRI experiments were conducted on a 1.5 T MRI scanner. Electromagnetic modelling of the ViP system was done using the Principle of Reciprocity. The ViP RF signals were generated using a compact waveform generator (dimensions of 26cm x 18cm x 16cm), connected to a home-built 25mm-diameter RF coil...
November 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/29121086/improved-segmented-modified-look-locker-inversion-recovery-t1-mapping-sequence-in-mice
#12
Maryam Nezafat, Isabel T Ramos, Markus Henningsson, Andrea Protti, Tamer Basha, René M Botnar
OBJECT: To develop and evaluate a 2D modified Look-Locker (MOLLI) for high-resolution T1 mapping in mice using a 3T MRI scanner. MATERIALS AND METHODS: To allow high-resolution T1 mapping in mice at high heart rates a multi-shot ECG-triggered 2D MOLLI sequence was developed. In the proposed T1 mapping sequence the optimal number of sampling points and pause cardiac cycles following an initial adiabatic inversion pulse was investigated in a phantom. Seven native control and eight mice, 3 days post myocardial infarction (MI) after administration of gadolinium were scanned...
2017: PloS One
https://www.readbyqxmd.com/read/29112534/il1%C3%AE-inhibition-contributes-to-the-anti-nociceptive-effects-of-voluntary-exercise-on-ischemia-reperfusion-induced-hypersensitivity
#13
Jessica L Ross, Luis F Queme, Jordan E Lamb, Kathryn J Green, Zachary K Ford, Michael P Jankowski
Issues of peripheral circulation have been increasingly suggested as an underlying cause of musculoskeletal pain in many conditions, including sickle cell anemia and peripheral vascular disease. We have previously shown in our model of transient ischemia and reperfusion injury (I/R) of the forelimb that individual group III and IV muscle afferents display altered chemosensitivity and mechanical thresholds 1 d following injury. Functional alterations corresponded to increased evoked and spontaneous pain-related behaviors and decreased muscle strength and voluntary activity-all actions that echo clinical symptoms of ischemic myalgia...
October 30, 2017: Pain
https://www.readbyqxmd.com/read/29072062/morpho-functional-cardiovascular-adaptation-in-hypertensive-patients-two-dimensional-speckle-tracking-echocardiographic-study
#14
Ines P Monte, Chiara DI Benedetto, Filippo A Atanasio, Valentina Losi, Salvatore Licciardi, Corrado Tamburino
BACKGROUND: Twenty-four-hour Blood Pressure (BP) variability is an important predictor of organ damage and cardiovascular events. Although epidemiological data are widely based on evaluation of office (Clinic) BP, 24-hour Ambulatory BP monitoring (ABPM) accurately assess the severity of hypertension to predict cardiovascular events in hypertensive patients, because it more accurately reflects BP load on heart and blood vessels. Conventional transthoracic echocardiography (TTE), such as M-mode and two-dimensional (2D), and more advanced techniques, such as tissue Doppler imaging (TDI) and speckle tracking echocardiography (STE), are used to identify pathological changes of the hypertensive heart disease...
October 25, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/29058039/agreement-between-manual-relaxometry-and-semi-automated-scanner-based-multi-echo-dixon-technique-for-measuring-liver-t2-in-a-pediatric-and-young-adult-population
#15
Suraj D Serai, Ethan A Smith, Andrew T Trout, Jonathan R Dillman
BACKGROUND: Commercially available 3D multi-echo Dixon (mDixon) sequences provide parametric maps of liver T2*, obviating manual curve fitting that is often required with conventional gradient recalled echo (GRE)-based multi-echo relaxometry, potentially simplifying clinical work flow. OBJECTIVE: The purpose of our study was to compare T2* values generated by a 3D mDixon sequence to values generated by GRE-based T2* relaxometry with manual curve fitting in a pediatric and young adult population...
October 23, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29045589/standardization-of-adult-transthoracic-echocardiography-reporting-in-agreement-with-recent-chamber-quantification-diastolic-function-and-heart-valve-disease-recommendations-an-expert-consensus-document-of-the-european-association-of-cardiovascular-imaging
#16
Maurizio Galderisi, Bernard Cosyns, Thor Edvardsen, Nuno Cardim, Victoria Delgado, Giovanni Di Salvo, Erwan Donal, Leyla Elif Sade, Laura Ernande, Madalina Garbi, Julia Grapsa, Andreas Hagendorff, Otto Kamp, Julien Magne, Ciro Santoro, Alexandros Stefanidis, Patrizio Lancellotti, Bogdan Popescu, Gilbert Habib
Aims: This European Association Cardiovascular Imaging (EACVI) Expert Consensus document aims at defining the main quantitative information on cardiac structure and function that needs to be included in standard echocardiographic report following recent ASE/EACVI chamber quantification, diastolic function, and heart valve disease recommendations. The document focuses on general reporting and specific pathological conditions such as heart failure, coronary artery and valvular heart disease, cardiomyopathies, and systemic diseases...
December 1, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29036973/-predictive-value-of-cardiac-magnetic-resonance-derived-parameters-on-the-improvement-of-left-ventricular-function-in-patients-with-acute-viral-myocarditis
#17
H C Ouyang, F C Ouyang, L L Mai, Y Y Chen, Y Z Hu, H X Chen, W S Li
Objective: To evaluate the predictive value of cardiac magnetic resonance (CMR)-derived parameters on the improvement of left ventricular function in patients with acute viral myocarditis. Methods: Forty patients, who referred for acute viral myocarditis in our hospital from September 2011 to September 2015, were prospectively enrolled in this study.All patients were examined by CMR during hospitalization for acute viral myocarditis (baseline) and after 12 months.The CMR sequences include: two dimension steady state free precession, 2D SSFP; triple inversion recovery, triple IR; early gadolinium enhancement; phase sensitive inversion recovery turbo field echo, PSIR TFE...
September 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29030995/magnetic-resonance-elastography-is-as-accurate-as-liver-biopsy-for-liver-fibrosis-staging
#18
Hiroyuki Morisaka, Utaroh Motosugi, Shintaro Ichikawa, Tadao Nakazawa, Tetsuo Kondo, Satoshi Funayama, Masanori Matsuda, Tomoaki Ichikawa, Hiroshi Onishi
BACKGROUND: Liver MR elastography (MRE) is available for the noninvasive assessment of liver fibrosis; however, no previous studies have compared the diagnostic ability of MRE with that of liver biopsy. PURPOSE: To compare the diagnostic accuracy of liver fibrosis staging between MRE-based methods and liver biopsy using the resected liver specimens as the reference standard. STUDY TYPE: A retrospective study at a single institution. POPULATION: In all, 200 patients who underwent preoperative MRE and subsequent surgical liver resection were included in this study...
October 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29029832/tumour-auto-contouring-on-2d-cine-mri-for-locally-advanced-lung-cancer-a-comparative-study
#19
Martin F Fast, Björn Eiben, Martin J Menten, Andreas Wetscherek, David J Hawkes, Jamie R McClelland, Uwe Oelfke
BACKGROUND AND PURPOSE: Radiotherapy guidance based on magnetic resonance imaging (MRI) is currently becoming a clinical reality. Fast 2d cine MRI sequences are expected to increase the precision of radiation delivery by facilitating tumour delineation during treatment. This study compares four auto-contouring algorithms for the task of delineating the primary tumour in six locally advanced (LA) lung cancer patients. MATERIAL AND METHODS: Twenty-two cine MRI sequences were acquired using either a balanced steady-state free precession or a spoiled gradient echo imaging technique...
October 10, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29025406/impact-of-empagliflozin-on-subclinical-left-ventricular-dysfunctions-and-on-the-mechanisms-involved-in-myocardial-disease-progression-in-type-2-diabetes-rationale-and-design-of-the-empa-heart-trial
#20
Andrea Natali, Lorenzo Nesti, Iacopo Fabiani, Enrico Calogero, Vitantonio Di Bello
BACKGROUND: Asymptomatic left ventricular (LV) dysfunction is highly prevalent in type 2 diabetes patients. Unlike the other hypoglycemic drugs, SGLT2 inhibitors have shown potential benefits for reducing cardiovascular death and risk factors, aside from lowering plasma glucose levels. With this study we aim at determining whether the treatment with empagliflozin is associated with an improvement in LV functions in diabetic patients with asymptomatic LV dysfunction against Sitagliptin, which is presumably neutral on myocardial function...
October 12, 2017: Cardiovascular Diabetology
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