Compared with 1.5T, 3T imaging has the inherent advantage of providing a higher signal-to-noise ratio (SNR) and higher resolution or faster scans, although there are trade-offs among these as well as certain limitations. 3T MR has a high specific absorption rate (four times that of 1.5T), decreased B1 homogeneity, longer T1 relaxation time, and increased susceptibility artifact. Despite these p...

Introduction DCE-MRI has been widely used at 1.5T in a variety of organs and tissues. The aim of this study was to assess the feasibility of DCE-MRI in the liver at 3T, taking into account the challenges of 3T systems, and performed in such a way as to allow a dual-input pharmacokinetic analysis, separating the perfusion contributions from the hepatic artery and portal vein. To our knowledge, t...

BACKGROUND AND PURPOSE Our aim was to compare 3D TOF-MRA sequences at 3T and 1.5T in the follow-up of coiled aneurysms. The follow-up of coiled intracranial aneurysms is mandatory to depict potential recanalization. 3D-TOF MRA is an appropriate tool for this purpose. MATERIALS AND METHODS DSA and 3D TOF-MRA at 1.5T and 3T were performed in a prospective series of 126 aneurysms in 96 patients ...

Introduction: The MAVRIC and SEMAC techniques enable low susceptibility-artifact imaging near metal implants using conventional spin-echo techniques [1,2]. Previous demonstrations of these techniques have been performed at 1.5T. Extending the techniques to 3T is easily feasible from a susceptibility artifact mitigation standpoint. This is due to the fact that both techniques restrict off-resona...

Digitally controlled oscillator (DCO) form the core of all digital phase locked loop (ADPLL).Nowadays portable batteries play a vital role in communication systems, hence low power circuits with reduced hardware are important. These criterions are satisfied by the proposed architecture. Different DCO designs with 3T NAND and 3T NOR gates as inverters proposed along with the result of 3T XOR and...

OBJECTIVE Histologic examination of multiple sclerosis (MS) brain lesions reveals heterogeneity including the presence or absence of a central blood vessel. Recent work has shown that T2* weighted magnetic resonance imaging at 7T allows the identification of small parenchymal veins within MS lesions. The aims of this study were (1) to compare whether a comparable sequence at 3T was also capable...

While the BOLD (Blood Oxygenation Level Dependent) contrast mechanism has demonstrated excellent sensitivity to neuronal activation, its specificity with regards to differentiating vascular and parenchymal responses has been an area of ongoing concern. By inducing a global increase in Cerebral Blood Flow (CBF), we examined the effect of magnetic field strength and echo-time (TE) on the gradient...

Methods Twenty-four patients and three controls (21 men, 6 women, mean age 33.4 years, age range 19-54) were recruited and scanned on 3T or 7T GE Excite scanners. Five TBI patients scanned at 3T received a repeat scan 1 to 12 months after the first scan, for a total of 23 scans at 3T and 9 scans at 7T. Sixteen of the patients had mild TBI (Glasgow Coma Scale (GCS) 13-15), three moderate TBI (GC...

designed in [2] for unobstructed Glu and Gln detection with chosen (TE, TM) regions in white boxes for phantom experiments. Fig. 2. In vitro STEAM spectra of Glu and Gln acquired at (72ms, 06 ms) and (84 ms, 58 ms) at 3T and multiplied with a filter to render them representative of typical in vivo line widths. Fig. 3. In vivo STEAM spectra acquired from a voxel including the ACC of a healthy vo...

Background Myocardial T2* relaxometry at 1.5T provides reliable non-invasive assessment of cardiac iron burden and is commonly used for the diagnosis and monitoring of patients at risk. 3T CMR offers some advantages over 1.5T but iron assessment has not been routinely performed at 3T due to technical concerns regarding artefacts and rapid signal loss, as well as a lack of tissue calibration. In...