公开(公告)号：US20170261581A1

公开(公告)日：2017-09-14

申请号：US15065042

申请日：2016-03-09

Applicant: Siemens Healthcare GmbH ,  NorthShore University HealthSystem

Inventor： Shivraman Giri ,  Robert R. Edelman ,  Ioannis Koktzoglou

IPC: G01R33/483 ,  G01R33/567 ,  G01R33/48 ,  A61B5/055 ,  A61B5/00

CPC classification number: A61B5/748 ,  A61B5/0013 ,  A61B5/055 ,  A61B5/7203 ,  A61B5/742 ,  A61B2576/00 ,  G01R33/3875 ,  G01R33/4824 ,  G01R33/4826 ,  G01R33/4838 ,  G01R33/5602 ,  G01R33/5607

Abstract: Embodiments relate to a method and system to improve fat suppression and reduce motion and off-resonance artifacts in magnetic resonance imaging (MRI) by using a background-suppressed, reduced field-of-view (FOV) radial imaging. The reduction of such artifacts provides improved diagnostic image quality, higher throughput of MRI scans for the imaging center, and increased patient comfort. By using a small FOV radial acquisition that only encompasses the structures of interest, structures that cause motion artifacts, such as the anterior abdominal wall, bowel loops, or blood vessels with pulsatile flow, are excluded from the image. According to an embodiment, combining a small FOV radial acquisition with one or more background-suppression techniques minimizes the impact of artifacts caused by anatomy outside of the FOV.

公开(公告)号：US20170119259A1

公开(公告)日：2017-05-04

申请号：US14927655

申请日：2015-10-30

Applicant: Siemens Medical Solutions USA, Inc. ,  NorthShore University HealthSystem Research Institute

Inventor： Shivraman Giri ,  Robert R. Edelman

IPC: A61B5/026 ,  A61B5/00 ,  G01R33/563 ,  G01R33/54 ,  G01R33/385 ,  G01R33/36

Abstract: A method for dual-contrast unenhanced magnetic resonance angiography includes iteratively acquiring flow-dependent slices and flow-independent slices in a region. Each iteration of the acquisition process comprises identifying a flow-dependent slice location within the region and identifying a flow-independent slice location upstream from the flow-dependent slice location according to blood flow in the region. Each iteration further includes applying a first radio frequency (RF) saturation pulse to the region such that MR signals from veins in the region are substantially suppressed, and applying a second RF saturation pulse to the flow-dependent slice location such that MR signals from background muscle and arterial blood in the region are substantially suppressed. A flow independent slice is acquired at the flow-independent slice location after the second RF saturation pulse is applied and before unsaturated arterial blood has maximally flowed into the region. After acquiring the flow-independent slice, a flow-dependent slice is acquired.

公开(公告)号：US09314164B2

公开(公告)日：2016-04-19

申请号：US13839234

申请日：2013-03-15

Applicant: NORTHSHORE UNIVERSITY HEALTHSYSTEM ,  NORTHWESTERN UNIVERSITY

Inventor： Vadim Backman ,  Hemant Roy ,  Young L. Kim ,  Michael Siegel ,  Vladimir Turzhitsky

IPC: A61B5/00 ,  A61B5/0205 ,  A61B5/026 ,  A61B5/145 ,  A61B5/1455 ,  A61B5/1459

CPC classification number: A61B5/0205 ,  A61B5/0075 ,  A61B5/0084 ,  A61B5/0091 ,  A61B5/0261 ,  A61B5/14535 ,  A61B5/14546 ,  A61B5/14551 ,  A61B5/1459 ,  A61B5/4255 ,  A61B2562/0233

Abstract: The present invention, in one aspect, relates to a method for distinguishing between possible adenomatous and hyperplastic polyps using what is referred to as “Early Increase in microvascular Blood Supply” (EIBS) that exists in tissues that are close to, but are not themselves, the abnormal tissue.

Abstract translation: 本发明的一方面涉及使用所谓的“微血管供血的早期增加”（EIBS）区分可能的腺瘤性和增生性息肉的方法，该方法存在于接近但不是本身的组织中 ，异常组织。

公开(公告)号：US20160073910A1

公开(公告)日：2016-03-17

申请号：US14852678

申请日：2015-09-14

Applicant: Northshore University Healthsystem

Inventor： Robert R. Edelman

IPC: A61B5/026 ,  G01R33/34 ,  G01R33/561 ,  G01R33/385 ,  G01R33/36

CPC classification number: A61B5/0263 ,  A61B2576/00 ,  G01R33/4835 ,  G01R33/5635

Abstract: A system and method is provided for magnetic resonance angiography (MRA) that includes performing a labeling pulse to a labeling region having a first portion of a vascular system of a subject. The labeling pulse includes at least one excitation pulse and a slab-selective magnetic field gradient to saturate spins flowing from the labeling region and into an imaging region. The process also includes observing a delay period and performing an imaging pulse sequence to collect a label imaging data set from one or more views through the imaging region using an excitation pulse. The preceding is repeated with a TR selected to ensure that the spins flowing within the imaging region are kept substantially saturated during a majority of repetitions. The process also includes acquiring a non-labeling imaging data set without saturating spins and reconstructing an image using the labeling imaging data set and the non-labeling imaging data.

Abstract translation: 提供了用于磁共振血管造影（MRA）的系统和方法，其包括对具有受试者血管系统的第一部分的标记区域进行标记脉冲。 标记脉冲包括至少一个激励脉冲和平板选择磁场梯度，以饱和从标记区域流入成像区域的自旋。 该过程还包括观察延迟周期并执行成像脉冲序列以通过使用激励脉冲的成像区域从一个或多个视图收集标签成像数据集。 重复上述操作，选择TR以确保在大多数重复期间在成像区域内流动的自旋保持基本饱和。 该过程还包括获取非标记成像数据集而不使饱和旋转和使用标记成像数据集和非标记成像数据重建图像。

公开(公告)号：US20160025829A1

公开(公告)日：2016-01-28

申请号：US14788266

申请日：2015-06-30

Applicant: Northshore University HealthSystem

Inventor： Ioannis Koktzoglou ,  Shivraman Giri ,  Robert R. Edelman

IPC: G01R33/48 ,  G01R33/36 ,  G01R33/567 ,  G01R33/565

CPC classification number: G01R33/4824 ,  G01R33/56518

Abstract: Systems and methods for designing a data acquisition scheme to be used in magnetic resonance imaging (“MRI”) are provided. In particular, the systems and methods include designing efficient, or otherwise optimized, azimuthal equidistant projections for radially sampling k-space. This sampling pattern resulting from this data acquisition scheme minimizes image artifacts, including those attributable to eddy currents. The data acquisition scheme can be computed rapidly and automatically and, thus, is fit for routine use in clinical MRI systems.

Abstract translation: 提供了用于设计用于磁共振成像（“MRI”）的数据采集方案的系统和方法。 特别地，系统和方法包括设计用于径向采样k空间的有效或其他优化的方位等距离投影。 由该数据采集方案产生的采样图案使图像伪影最小化，包括归因于涡流的图像伪影。 数据采集​​方案可以快速，自动地进行计算，从而适合临床MRI系统的常规使用。