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1. 发明授权

KR101703833B1 공명 주파수 편차를 결정하기 위한 방법 및 자기 공명 시스템 有权
标题翻译：方法和磁共振系统确定谐振频偏
公开(公告)号：KR101703833B1
公开(公告)日：2017-02-07
申请号：KR1020140038719
申请日：2014-04-01
申请人： 지멘스 악티엔게젤샤프트
发明人： 바흐쉬미트,테레사 , 니트카,마티아스
IPC分类号： A61B5/055 , G01R33/58 , G01R33/36 , G01R33/565 , G01R33/483
CPC分类号： G01R33/5659 , G01R33/56536
摘要： 공명주파수편차를결정하기위한방법및 자기공명시스템본 발명은자기공명시스템(5)에의해검사대상(0) 내의볼륨세그먼트의슬라이스의여기가주어질때 공명주파수편차를결정하기위한제1 방법에관한것이다. 방법은이에의해다음단계들을포함한다: ㆍ한 방향(R)을따라슬라이스선택기울기(44)를스위칭하는단계. ㆍ슬라이스를여기시키기위해 RF 여기펄스(41)를조사하는단계. ㆍ방향(R)을따라판독기울기(46)를스위칭하는단계. ㆍ판독기울기(46)가스위칭되는동안 MR 데이터를판독하는단계. ㆍ MR 데이터를사용하여재구성된 MR 이미지내의이미지포인트들의위치를알아내는단계― 이미지포인트들은미리결정된임계치보다더 큰신호강도를나타내고, 이단계는이미지포인트들중 슬라이스와의사이에방향(R)에대응하는최대분리(52; 53)를가지는하나의이미지포인트를결정하기위해수행됨―. ㆍ슬라이스선택기울기(44)의진폭, 판독기울기(46)의진폭및 최대분리(52; 53)에따라공명주파수편차를결정하는단계. 슬라이스선택기울기(44) 및판독기울기(46)는반대극성을가진다.
摘要翻译：在第一种方法和磁共振设备中，为了确定在检查对象内的体积片段的激发，确定共振频率偏差，通过沿着一个方向激活切片选择梯度，照射RF激发脉冲以激发切片中的核自旋，沿着切片选择梯度的方向激活读出梯度，并且在读出梯度被激活时读出MR数据。识别使用MR数据重建的MR图像内的图像点，其表现出大于预定阈值的信号强度，以便确定在该图像点和图像点之间的方向上具有最大间隔的图像点之一片。谐振频率偏差根据切片选择梯度的幅度，读出梯度的幅度和最大间隔来确定。切片选择梯度和读数梯度具有相反的极性。

2. 发明公开

KR1020140120839A 공명 주파수 편차를 결정하기 위한 방법 및 자기 공명 시스템 有权
标题翻译：方法和磁共振系统确定谐振频偏
公开(公告)号：KR1020140120839A
公开(公告)日：2014-10-14
申请号：KR1020140038719
申请日：2014-04-01
申请人： 지멘스 악티엔게젤샤프트
发明人： 바흐쉬미트,테레사 , 니트카,마티아스
IPC分类号： A61B5/055 , G01R33/58 , G01R33/36 , G01R33/565 , G01R33/483
CPC分类号： G01R33/5659 , G01R33/56536 , A61B5/055 , G01R33/3621 , G01R33/4835 , G01R33/583
摘要： Disclosed are a method and a magnetic resonance system for determining a resonance frequency deviation. The present invention relates to a first method of determining the resonance frequency deviation when a slice of a volume segment of a subject (0) is excited by a magnetic resonance system (5). The first method is as follows: a slice selection slope (44) is switched along one direction (R_1); a slice is irradiated by a radio frequency (RF) excitation pulse (41) to be excited; a reading slope (46) is switched along the direction (R_1); magnetic resonance (MR) data is read while the reading slope (46) is switched; positions of image points in an MR image, which is reconstructed by using the MR data, are obtained, wherein the image points bear signal strengths greater than a predetermined threshold value, and this step is performed to determine one image point having a maximum separation (52; 53) corresponding to the direction (R_1) between the slices, among the image points; and, the resonance frequency deviation is determined according to an amplitude of the slice selection slope (44), an amplitude of the reading slope (46), and the maximum separation (52; 53). The slice selection slope (44) and the reading slope (46) have opposite polarities.
摘要翻译：公开了一种用于确定谐振频率偏差的方法和磁共振系统。本发明涉及当由磁共振系统（5）激发受试者（0）的体积段的切片时确定共振频率偏差的第一方法。第一种方法如下：切片选择斜率（44）沿着一个方向（R_1）切换; 通过射频（RF）激励脉冲（41）照射切片以被激发; 读取斜面（46）沿方向（R_1）切换; 在读取斜率（46）被切换的同时读取磁共振（MR）数据; 获得通过使用MR数据重建的MR图像中的图像点的位置，其中图像点承受大于预定阈值的信号强度，并且执行该步骤以确定具有最大间隔的一个图像点（ 52; 53）对应于图像点之间的切片之间的方向（R_1）; 并且根据切片选择斜率（44）的振幅，读取斜率（46）的振幅和最大间隔（52; 53）来确定共振频率偏差。切片选择斜率（44）和读取斜率（46）具有相反的极性。

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