Frequency stabilization using infinite impulse response filtering for SSFP fMRI at 3T

Ming Long Wu, Pei Hsin Wu, Teng Yi Huang, Yi Yu Shih, Ming Chung Chou, Hua Shan Liu, Hsiao Wen Chung, Cheng Yu Chen

研究成果: 雜誌貢獻文章

16 引文 斯高帕斯(Scopus)

摘要

The steady-state free precession (SSFP) method has been shown to exhibit strong potential for distortion-free functional magnetic resonance imaging (fMRI). One major challenge of SSFP fMRI is that the frequency band corresponding to the highest functional sensitivity is extremely narrow, leading to substantial loss of functional contrast in the presence of magnetic field drifts. In this study we propose a frequency stabilization scheme whereby an RF pulse with small flip angle is applied before each image scan, and the initial phase of the free induction decay (FID) signals is extracted to reflect temporal field drifts. A simple infinite impulse response (IIR) filter is further employed to obtain a low-pass-filtered estimate of the central reference frequency for the upcoming scan. Experimental results suggest that the proposed scheme can stabilize the frequency settings in accordance with field drifts, with oscillation amplitudes of
原文英語
頁(從 - 到)369-379
頁數11
期刊Magnetic Resonance in Medicine
57
發行號2
DOIs
出版狀態已發佈 - 二月 2007
對外發佈Yes

    指紋

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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