Thirty-five of the 49 patients also underwent fluoroscopy-guided 3T MR arthrography of the wrist joint using a gadolinium/saline contrast mix. Arthroscopy found TFCC tears in 22 patients, scapholunate tears in 18, and lunatotriquetral tears in 11. Nineteen TFCC tears, 16 scapholunate tears, and nine lunatotriquetral tears were seen on 3T MRI. There were no false-positive readings on MRI compare...

Methods Patients with DCM (n = 15, age 58 ± 2 years), stable on medical therapy, were studied before and after 8 weeks of training for 20 minutes, 5 times per week on a home exercise bike. Cardiac volumes and function were measured using MR at 3T during rest and leg exercise. High energy phosphate metabolism was measured as the ratio of phosphocreatine to ATP (PCr/ATP) by Phosphorus magnetic re...

Background Myocardial BOLD MRI is a non-contrast approach for examining myocardial perfusion. Although recent developments have shown promising technical advancements, current myocardial BOLD MR methods are still limited by: (a) poor spatial coverage; (b) imaging confounders; and (c) imaging artifacts, particularly at 3T. To address these limitations, we developed a heart-rate independent, free...

This paper presents a novel walking hybrid-kinematics robot that can be reconfigured to have three, five, and six degrees of freedom (DOFs) for adsorption machining large structures. A symmetric 3PRPR or 3PRRR parallel mechanism with three translational (3T) DOFs is used perform three-axis tasks. Three attachment pads connected passive spherical joints are attach the surface structure. Two rota...

We examine the electrical and thermal characteristics of a photovoltaic module with three-terminal cell interconnection when partially shading solar by experimentally verified modeling. For multi junction tandem cells two- (2T), three- (3T), four-terminal (4T) architecture is conceivable. The 3T featuring combination parallel series combines advantageous 2T 4T without their drawbacks. build (PV...

(1) Compute the Laplace transform of f (t) = t e 3t from its definition. Solution. The definition of the Laplace transform gives L[f ](s) = lim T →∞ T 0 e −st t e 3t dt = lim T →∞ T 0 t e (3−s)t dt. This limit diverges to +∞ for s ≤ 3 because in that case T 0 t e (3−s)t dt ≥ T 0 t dt = T 2 2 , which clearly diverges to +∞ as T → ∞. For s > 3 an integration by parts shows that T 0 t e (3−s)t dt ...

Background Quantification of myocardial iron overload is critical for the management of patients with hemochromatosis. T2* relaxation time or its inverse R2*, are currently the noninvasive gold standard at 1.5T, as they strongly correlate with myocardial iron concentration, and are obtained using a fast single breath-hold ECG-gated multi-echo GRE sequence. However, due to high sensitivity to B0...

Background and objective The Modified Look-Locker Inversion-Recovery (MOLLI) sequence (Messroghli, et al, JMRI, 2007) was optimized for myocardial T1 mapping on 1.5T. However, little data exists on T1 mapping at 3T. The standard MOLLI sequence uses three inversion-recovery blocks to acquire 11 images over 17 heartbeats (HB). The long breath hold could limit its clinical application in patients ...

This article illustrates changes in the underlying physics concepts related to increasing the main magnetic field from 1.5T to 3T. The effects of these changes on tissue constants and practical hardware limitations is discussed as they affect scan time, quality, and contrast. Changes in susceptibility artifacts, chemical shift artifacts, and dielectric effects as a result of the increased field...