To date, magnetic resonance (MR) is established as an imaging modality in the diagnosis of chest diseases. Because of its excellent distinction of vessels and soft tissue, MR can be performed as the primary imaging procedure before computed tomography in patients with suspected vascular lesions, mediastinal masses, hilar lesions, and pathological changes of the pleura and the chest wall. In the...

slice misregistration artifacts. As scanner technology improved, short-echo-time 3D gadoliniumenhanced acquisitions (using phase encoding for 2 dimensions) reduced flow artifacts and reduced artifacts from surgical clips, stents, sternal wires, embolization coils, and other ferromagnetic hardware commonly found in congenital heart disease patients. The 3D acquisition can have a single center of...

Proton magnetic resonance imaging (MRI) has recently emerged as a clinical tool to image the lungs. This paper outlines the current technical aspects of MRI pulse sequences, radiofrequency (RF) coils and MRI system requirements needed for imaging the pulmonary parenchyma and vasculature. Lung MRI techniques are presented as a "technical toolkit", from which MR protocols will be composed in the ...

Introduction Gradient coils in MR scanners are assumed to produce linear magnetic field gradients, however high-speed gradients show nonlinear characteristics as a trade-off[1]. This fact creates structural deformations in MR images during reconstruction, as the gradients are assumed to be linear. A correction for these structural deformations has been shown to be imperative in multi-site struc...

Introduction/Purpose An image-based localization of interventional tools or devices inside the magnet requires adequate, MR-visible markers and a powerful image processing tool to automatically detect them. In contrast to active tracking techniques, a substantial amount of time is needed for the acquisition of the marker images alone. In this work, a marker sequence at low spatial resolution wa...

Moving table magnetic resonance imaging (MRI) techniques potentially improve the scan time efficiency of large field-of-view (FOV) MR imaging applications and provide the physician with seamless images of the extended FOV. Particularly peripheral MR angiography (MRA) requires high spatial resolution to resolve small arteries and at the same time has rigid scan time constraints in order to stay ...

The US HL-LHC Accelerator Upgrade Project (AUP) is building Nb 3 Sn quadrupole magnets, called MQXFA, with plans to install 16 of them in the Interaction Regions. Variability coil size must be dealt at assembly level, which requires timely and repeatable measurement each coil. In this paper we w...

Conventionally, magnetic resonance imaging (MRI) is performed by pulsing gradient coils, which invariably leads to strong acoustic noise, patient safety concerns due to induced currents, and costly power/space requirements. This modeling study investigates a new silent, gradient coil-free MR imaging method, in which a radiofrequency (RF) coil and its nonuniform field (B 1 (+)) are mechanically ...

Adaptive reconstruction of phased array MRI. Abstract-An adaptive implementation of the spatial matched filter and its application to the reconstruction of phased array MR imagery is described. Locally relevant array correlation statistics for the NMR signal and noise process are derived directly from the set of complex individual coil images, in the form of sample correlation matrices. Eigen-a...

In this article, the underlying theory of clinical diffusion MR imaging, including diffusion tensor imaging (DTI) and fiber tractography, is reviewed. First, a brief explanation of the basic physics of diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) mapping is provided. This is followed by an overview of the additional information that can be derived from the diffusion...