| Project/Area Number |
10670846
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Radiation science
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MATSUDA Tetsuya Kyoto University, Graduate School of Medicine, Department of Medical Informatics, Associate Professor, 医学研究科, 助教授 (00209561)
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| Co-Investigator(Kenkyū-buntansha) |
KOMORI Masaru Kyoto University, Graduate School of Medicine, Department of Medical Informatics, Lecturer, 医学研究科, 講師 (80186824)
TAKAHASHI Takashi Kyoto University, Graduate School of Medicine, Department of Medical Informatics, Professor, 医学研究科, 教授 (40055992)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | 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 |
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| Research Abstract |
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.
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