公开(公告)号：US20140062475A1

公开(公告)日：2014-03-06

申请号：US13603210

申请日：2012-09-04

申请人： Kevin Matthew Koch ,  Eric M. Printz

发明人： Kevin Matthew Koch ,  Eric M. Printz

IPC分类号： G01R33/56 ,  G01R33/341

CPC分类号： G01R33/56563 ,  G01R33/243

摘要： A method includes receiving a forward spatial encoding polarity magnetic resonance (MR) coil image and a reverse spatial encoding polarity MR coil image generated from data obtained with a magnetic field gradient that is reversed with respect to the magnetic field gradient with which the forward spatial encoding polarity MR coil image is acquired. The method also includes performing an iterative shift map calculation algorithm to determine a pixel shift map corresponding to a minimized difference between the forward and reverse spatial encoding polarity MR coil images, converting the pixel shift map into a magnetic field shift map by determining a magnetic field value corresponding to each pixel in the pixel shift map, and providing the magnetic field shift map as an input to a shim calculation process that includes determining a level of at least one shim current.

摘要翻译： 一种方法包括接收正向空间编码极性磁共振（MR）线圈图像和由相对于磁场梯度反转的磁场梯度获得的数据产生的反向空间编码极性MR线圈图像，所述磁场梯度与前向空间编码 获取极性MR线圈图像。 该方法还包括执行迭代移位映射计算算法以确定对应于正向和反向空间编码极性MR线圈图像之间的最小差异的像素移位图，通过确定磁场来将像素移位图转换为磁场移位图 对应于像素移位图中的每个像素的值，以及提供磁场移动图作为包括确定至少一个平均电流的电平的垫片计算处理的输入。

公开(公告)号：US09513359B2

公开(公告)日：2016-12-06

申请号：US13603210

申请日：2012-09-04

申请人： Kevin Matthew Koch ,  Eric M. Printz

发明人： Kevin Matthew Koch ,  Eric M. Printz

IPC分类号： G01R33/565 ,  G01R33/24

CPC分类号： G01R33/56563 ,  G01R33/243

摘要： A method includes receiving a forward spatial encoding polarity magnetic resonance (MR) coil image and a reverse spatial encoding polarity MR coil image generated from data obtained with a magnetic field gradient that is reversed with respect to the magnetic field gradient with which the forward spatial encoding polarity MR coil image is acquired. The method also includes performing an iterative shift map calculation algorithm to determine a pixel shift map corresponding to a minimized difference between the forward and reverse spatial encoding polarity MR coil images, converting the pixel shift map into a magnetic field shift map by determining a magnetic field value corresponding to each pixel in the pixel shift map, and providing the magnetic field shift map as an input to a shim calculation process that includes determining a level of at least one shim current.

摘要翻译： 一种方法包括接收正向空间编码极性磁共振（MR）线圈图像和由相对于磁场梯度反转的磁场梯度获得的数据产生的反向空间编码极性MR线圈图像，所述磁场梯度与前向空间编码 获取极性MR线圈图像。 该方法还包括执行迭代移位映射计算算法以确定对应于正向和反向空间编码极性MR线圈图像之间的最小差异的像素移位图，通过确定磁场来将像素移位图转换为磁场移位图 对应于像素移位图中的每个像素的值，以及提供磁场移动图作为包括确定至少一个平均电流的电平的垫片计算处理的输入。

公开(公告)号：US10064589B2

公开(公告)日：2018-09-04

申请号：US14317556

申请日：2014-06-27

申请人： Kevin Matthew Koch ,  Gaspar Delso

发明人： Kevin Matthew Koch ,  Gaspar Delso

IPC分类号： A61B6/00 ,  A61B5/055 ,  A61B6/03 ,  A61B5/00 ,  G01R33/48

摘要： A method for attenuation correcting a PET image of a target includes locating a radiopaque structure by MRI scan of the target; fitting a model of the radiopaque structure to the MRI scan image; and correcting attenuation of the PET image based on the fitted model.

公开(公告)号：US10061007B2

公开(公告)日：2018-08-28

申请号：US14317728

申请日：2014-06-27

申请人： Dawei Gui ,  Kevin Matthew Koch

发明人： Dawei Gui ,  Kevin Matthew Koch

IPC分类号： G01V3/00 ,  G01R33/565 ,  G01R33/561

CPC分类号： G01R33/56536 ,  G01R33/5617

摘要： A method for acquiring 3D multispectral MRI of a target includes scanning a spectrum of spectral windows with an MRI scanner, wherein each spectral window of the spectrum defines a continuously-differentiable distribution of frequencies around a scan frequency and adjacent scan frequencies are spaced apart by substantially uniform frequency offsets such that adjacent spectral windows substantially uniformly overlap, wherein selected adjacent spectral windows are scanned in consecutive passes, and nearest neighbor spectral windows within each pass are scanned at a maximum temporal spacing within the pass.