Analysis of Flow and Motion Effects in Burst Imaging

突发成像中的流动和运动效应分析

• 批准号: 10670846
• 负责人: MATSUDA Tetsuya
• 金额: $ 2.37万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10670846/
• 关键词: MRI(Magnetic Resonance Imaging); Ultrafast MR Imaging; Burst Imaging; Motion Artifact; Phase Correction; Burst Imaging; MRI; 超高速撮影法; 血流; 運動

Burst imaging can obtain a magnetic resonance (MR) image within 100 msec. In spite of its ultrafast feature, burst imaging is very sensitive to motion of the object to be imaged. The motion in the readout direction produces significant artifacts in the obtained image. To investigate the motion effects in burst imaging, we have analyzed the experimental MR signal obtained from a moving phantom with constant velocity and have performed a computer simulation of MR signal produced by burst imaging sequence.The analysis of the experimental data and the computer simulation on burst imaging signal demonstrated that the phase of the MR signal was affected by the motion but its change was not even for each signal. Such motion effect was originated from the characteristic use of excitation pulses in burst imaging. The computer simulation further suggested the change of the phase can be corrected by a simple post-processing method.Being based on such data assessment, we have proposed a motion correction method for burst imaging and the method was applied to experimental data of motion phantom with various range of velocity. The method have successfully correct the phase of the signal and the corrected image have removed the motion induced image artifact of burst imaging.

突发成像可以在 100 毫秒内获得磁共振 (MR) 图像。尽管具有超快的特性，突发成像对被成像物体的运动非常敏感。读出方向上的运动在所获得的图像中产生明显的伪影。为了研究突发成像中的运动效应，我们分析了从匀速运动体模获得的实验MR信号，并对突发成像序列产生的MR信号进行了计算机模拟。实验数据分析和计算机模拟突发成像信号表明，MR 信号的相位受到运动的影响，但每个信号的变化并不均匀。这种运动效应源于突发成像中激励脉冲的特性使用。计算机模拟进一步表明相位的变化可以通过简单的后处理方法进行校正。基于这样的数据评估，我们提出了一种突发成像的运动校正方法，并将该方法应用于运动模型的实验数据各种速度范围。该方法成功地校正了信号的相位，校正后的图像消除了突发成像的运动引起的图像伪影。

项目成果

M,Motooka: "Single Breath-Hold Left Ventricular Volume Measurement by 0.3-Sec Turbo Fast Low-Angle Shot MR Imaging"Am J Roentgenol. 172. 1645-1649 (1999)

M，Motooka：“通过 0.3 秒涡轮快速低角度拍摄 MR 成像进行单次屏气左心室容积测量”Am J Roentgenol。

E.Tadamura et al.: "Assessment of Regional and Global Left Ventricular Function by Reinjection T1-201 and Rest Tc-99m Sestamibi Ecg-Gated Spect : Comperison with Three Dimensional Magnetic Resonance Imaging." J Am Coll Cardiol. (in press).

E.Tadamura 等人：“通过回注 T1-201 和休息 Tc-99m Sestamibi 心电图门控频谱来评估区域和整体左心室功能：与三维磁共振成像的比较。”

M.Motooka: "Single Breath-Hold Left Ventricular Volume Measurement by 0.3-Sec Turbo Fast Low-Angle Shot MR Imaging"Am J Roentgenol. 172. 1645-1649 (1999)

M.Motooka：“通过 0.3 秒涡轮快速低角度拍摄 MR 成像进行单次屏气左心室容积测量”Am J Roentgenol。

M.Motooka et al.: "Single Breath-Hold Left Ventricular Volume Measurement by 0.3-Sec Turbo Fast Low-Angle Shot MR Imaging." Am J Roentgenol. (in press).

M.Motooka 等人：“通过 0.3 秒涡轮快速低角度拍摄 MR 成像进行单次屏气左心室容积测量。”

松田 哲也: "循環器領域におけるEPIと他の高速撮影法の現状." 日本磁気共鳴医学会雑誌. 18巻7号. 391-399 (1998)

Tetsuya Matsuda：“EPI 和其他高速成像方法在心血管领域的现状。”日本医学磁共振学会杂志，第 18 卷，第 7 期，391-399（1998 年）