公开(公告)号：KR1020080110316A

公开(公告)日：2008-12-18

申请号：KR1020070058917

申请日：2007-06-15

Applicant: 한국과학기술원

Inventor： 박현욱 ,  윤성대

IPC: A61B5/055 ,  G01V3/00

CPC classification number: G01R33/5611 ,  G01R33/4806 ,  G01R33/482 ,  G01R33/5608 ,  G01R33/5619 ,  G01R33/56308

Abstract: A method for imaging high resolution MRI using generalized series parallel imaging technique and recording media thereof and provided to have a high time resolution by being applied in a ultra high magnetic field system. A method for imaging high resolution MRI using generalized series parallel imaging technique obtains a magnetic resonance data by sampling only a frequency lower than Nyquist standards among all frequency bands. A method for sampling to the frequency lower than the Nyquist standards is a sampling method of a SPACE RIP(Sensitivity Profiles From an Array of Coils for Encoding and Reconstruction in Parallel).

Abstract translation: 一种使用广义串联并行成像技术及其记录介质对高分辨率MRI进行成像的方法，并通过应用于超高磁场系统提供高时间分辨率。 使用广义串联并行成像技术对高分辨率MRI进行成像的方法通过在所有频带中仅采样低于奈奎斯特标准的频率来获得磁共振数据。 对于低于奈奎斯特标准的频率进行采样的方法是SPACE RIP（来自用于编码和重构并行的线圈的灵敏度分布）的采样方法。

公开(公告)号：KR100902518B1

公开(公告)日：2009-06-15

申请号：KR1020070058917

申请日：2007-06-15

Applicant: 한국과학기술원

Inventor： 박현욱 ,  윤성대

IPC: A61B5/055 ,  G01V3/00

CPC classification number: G01R33/5611 ,  G01R33/4806 ,  G01R33/482 ,  G01R33/5608 ,  G01R33/5619 ,  G01R33/56308

Abstract: 본 발명은 일반급수 병렬영상법이라는 새로운 자기공명영상법을 이용하여 고해상도 자기공명영상 생성방법 및 그 기록매체에 관한 것이다. 이러한 본 발명에 따른 일반급수 병렬영상법을 이용한 고해상도 자기공명영상 생성방법은 모든 주파수대역 중에서 한정된 저주파대역(Low Frequency)만을 나이퀴스트(Nyquist) 기준보다 낮은 빈도로 샘플링하여 자기공명데이터를 획득한다.
자기공명영상(Magnetic Resonance Imaging, MRI), 기능자기공명영상(functional Magnetic Resonance Imaging, fMRI), 일반급수(Generalized Series, GS), 병렬자기공명(Parallel MRI, pMRI).

公开(公告)号：KR100656156B1

公开(公告)日：2006-12-13

申请号：KR1020050062408

申请日：2005-07-11

Applicant: 한국과학기술원

Inventor： 윤성대 ,  박현욱

IPC: A61B5/055

Abstract: A method for correcting brightness inequality in a phased-array coil image for a parallel magnetic resonance imaging based on a projection profile is provided to obtain an optimum result image by correcting each image with software without investing cost. A method for correcting brightness inequality in a phased-array coil image for a parallel magnetic resonance imaging based on the projection profile includes the steps of: acquiring an initial image by integrating an image signal obtained from each coil based on a projection profile; calculating each initial image and adjusting smoothly the initial image by applying nonlinear curve fitting to the projection profile; acquiring the adjusted image having a brightness distribution map by back-projecting the initial image after the adjusting step; acquiring an equal image having an equal brightness distribution by dividing the initial image of the pre-adjusting step by the adjusted image of the post-adjusting step, and calculating a mean value; combining the each equal image and acquiring the combined image having an equal brightness distribution.

Abstract translation: 提供了一种基于投影轮廓校正用于平行磁共振成像的相控阵列线圈图像中亮度不等的方法，以通过用软件校正每个图像而无需投入成本来获得最佳结果图像。 一种用于基于投影轮廓校正平行磁共振成像的相控阵线圈图像中亮度不等的方法包括以下步骤：通过基于投影轮廓对从每个线圈获得的图像信号进行积分来获取初始图像; 通过对投影轮廓应用非线性曲线拟合来计算每个初始图像并平滑地调整初始图像; 通过在调节步骤之后反投影初始图像来获取具有亮度分布图的调节图像; 通过将预调节步骤的初始图像除以调节后步骤的调节图像来获得具有相等亮度分布的相等图像，并且计算平均值; 组合每个相等的图像并获取具有相等亮度分布的组合图像。

公开(公告)号：KR101030676B1

公开(公告)日：2011-04-22

申请号：KR1020090000255

申请日：2009-01-05

Applicant: 한국과학기술원

Inventor： 박현욱 ,  윤성대

IPC: A61B5/055

CPC classification number: G01R33/5611 ,  G01R33/4806 ,  G01R33/5619 ,  G01R33/56308

Abstract: 높은 시공간 해상도의 기능적 자기 공명 영상을 위한 고차 일반 급수 병렬 영상법 및 샘플링 법이 개시된다. 본 발명에 따르면, 높은 시공간 해상도를 갖는 자기 공명 영상을 얻기 위한 방법으로서, 입력 영상에 대해 k 공간(k-space)에서 샘플링을 수행하는 단계, 상기 샘플링 결과로서 획득된 데이터에 대해 병렬 자기 공명 영상법을 적용하여 제1 재구성 영상을 획득하는 단계, 및 상기 제1 재구성 영상에 대해 고차 일반 급수 영상법(Higher-Order Generalized Series(HGS))을 적용하여 제2 재구성 영상을 획득하는 단계를 포함하며, 상기 샘플링을 수행하는 단계는, 상기 k 공간의 중앙 부분에 대해 한정적으로 샘플링을 수행하되, 나이퀴스트(nyquist) 비율보다 낮은 비율로 데이터를 획득하는 단계를 포함하는 자기 공명 영상법이 제공된다. 본 발명에 의하면, 영상 획득 속도가 빨라질 수 있고, 고해상도 기능 자기 공명 영상이 얻어질 수 있게 된다.
자기 공명 영상, 고차 일반 급수 영상법, 병렬 자기 공명 영상법

公开(公告)号：KR100726739B1

公开(公告)日：2007-06-11

申请号：KR1020060004514

申请日：2006-01-16

Applicant: 한국과학기술원

Inventor： 윤성대 ,  박현욱

IPC: A61B5/055

Abstract: A method and an apparatus for acquiring a parallel magnetic resonance image using a radial k-space path, and a computer readable record medium for executing the same are provided to reduce a motion artifact shown in a DTI image by re-constituting an image through size information without phase information of data. A method for acquiring a parallel magnetic resonance image using a radial k-space path includes the steps of: acquiring magnetic resonance data according to a radial path in a k-space; setting a rotation relation of the radial path and a Cartersian path; and acquiring a magnetic resonance image from the magnetic resonance data by the rotation relation. The magnetic resonance data includes X projection data according to a predetermined angle. The projection data includes data acquired repeatedly for A predetermined angles. The projection data includes data acquired by C-different channels for the predetermined angle. The X, A, C are integers.

Abstract translation: 提供了一种使用径向k空间路径来获取平行磁共振图像的方法和设备，以及用于执行该方法的计算机可读记录介质，以通过重构尺寸的图像来减少DTI图像中所示的运动伪影 没有数据相位信息的信息。 一种使用径向k空间路径获取平行磁共振图像的方法包括以下步骤：根据k空间中的径向路径采集磁共振数据; 设定径向路径和卡特尔斯路径的旋转关系; 以及通过旋转关系从磁共振数据获取磁共振图像。 磁共振数据包括根据预定角度的X投影数据。 投影数据包括对于预定角度重复获取的数据。 投影数据包括针对预定角度通过C不同信道获取的数据。 X，A，C是整数。

公开(公告)号：KR1020100081005A

公开(公告)日：2010-07-14

申请号：KR1020090000255

申请日：2009-01-05

Applicant: 한국과학기술원

Inventor： 박현욱 ,  윤성대

IPC: A61B5/055

CPC classification number: G01R33/5611 ,  G01R33/4806 ,  G01R33/5619 ,  G01R33/56308

Abstract: PURPOSE: A higher order generalized series parallel imaging method and a sampling method are provided to reduce an image obtaining time by combining a parallel magnetic resonance imaging method and a higher order generalized imaging method. CONSTITUTION: An input image is sampled in a k-space. A first re-composition image is obtained by applying a parallel magnetic resonance imaging method to the data obtained by the sampling. A second re-composition image is obtained by applying a higher order generalized imaging method to the first re-composition image. The parallel magnetic resonance imaging method is a SPACE RIP(Sensitivity Profiles From Array of Coils for Encoding and Reconstruction in Parallel), SENCE, and PILS or GRAPPA.

Abstract translation: 目的：提供一种更高阶的广义串联并行成像方法和采样方法，通过组合并行磁共振成像方法和较高阶广义成像方法来减少图像获取时间。 构成：输入图像在k空间中采样。 通过将并行磁共振成像方法应用于通过采样获得的数据来获得第一重新组合图像。 通过对第一重新组合图像应用较高阶广义成像方法获得第二重组图像。 并行磁共振成像方法是SPACE RIP（来自并行编码和重建的线圈阵列的灵敏度分布），SENCE和PILS或GRAPPA。

公开(公告)号：KR100636012B1

公开(公告)日：2006-10-20

申请号：KR1020050062416

申请日：2005-07-11

Applicant: 한국과학기술원

Inventor： 윤성대 ,  박현욱

IPC: A61B5/055

Abstract: A method of reducing a ghost artifact in an EPI by using sensitivity encoding and a computer readable record medium with a program for executing the method are provided to remove an aliasing signal by using the sensitivity encoding. An initial image is obtained by using a multiple channel coil of an EPI(Echo Planar Image), in which an odd image and an even image are alternatively obtained from left and right parts of a path obtaining a signal of a frequency region. Only even image is collected from the initial image, and then is Fourier-transformed to obtain an even intermediate image. Only odd image is collected from the initial image, and then is Fourier-transformed to obtain an odd intermediate image. The even intermediate image and the odd intermediate image are sensitivity-encoded to obtain an even image and an odd image. A final image is generated by taking an average of the even image and odd image.

Abstract translation: 提供了一种通过使用灵敏度编码来减少EPI中的重影伪影的方法以及具有用于执行该方法的程序的计算机可读记录介质，以通过使用灵敏度编码去除混叠信号。 通过使用EPI（回波平面图像）的多通道线圈来获得初始图像，其中从获得频率区域的信号的路径的左侧和右侧部分交替地获得奇数图像和偶数图像。 仅从初始图像收集偶数图像，然后进行傅里叶变换以获得均匀的中间图像。 仅从初始图像收集奇数图像，然后进行傅里叶变换以获得奇数中间图像。 偶数中间图像和奇数中间图像被灵敏度编码以获得偶数图像和奇数图像。 通过取平均图像和奇数图像的平均值来生成最终图像。