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• Technical Article •
Diffusion weighted imaging of head based on GRADE-DWI sequence
LIAO Zhenhong  MING Bing  MA Chun  LIU Gaoyuan  ZHANG Yong 

Cite this article as: Liao ZH, Ming B, Ma C, et al. Diffusion weighted imaging of head based on GRADE-DWI sequence. Chin J Magn Reson Imaging, 2020, 11(6): 433-437. DOI:10.12015/issn.1674-8034.2020.06.007.


[Abstract] Objective: To compare brain image quality between echo-planar imaging diffusion-weighted imaging (EPI-DWI) and gradient and spin echo diffusion-weighted imaging (GRASE-DWI) in magnetic resonance imaging (MRI) examination of head.Materials and Methods: This prospective study enrolled patients with clinical suspicion of cerebral infarction. The scans were performed on a 3.0 T MRI with sequences consisted of T2W-TSE, T1W-TSE, single-shot EPI-DWI and GRASE-DWI. Two blinded neuroradiologists evaluated both EPI-DWI and GRASE-DWI images independently using a 5-point Likert scale. The evaluation included image definition, distortion and magnetic susceptibility artifact. For patients confirmed with cerebral infarction diagnosis, apparent diffusion coefficient (ADC) value, misaligned distance of fusion images of TIWI-TSE and two DWIs, signal-to-noise ratio (SNR), signal intensity ratio (SIR), and contrast-to-noise ratio (CNR) were also obtained for further comparisons. Interobserver agreement was also evaluated.Results: 45 patients were included in this study. Among them, 33 patients were diagnosed with cerebral infarction. The distortions and magnetic susceptibility artifacts of GRASE-DWI were smaller than those of EPI-DWI (P<0.05). There was no significant difference in the image definition between groups (P>0.05), and the interobserver agreement was good (Kappa=0.67, 0.61, 0.69, 0.71). The SNR and CNR of GRASE-DWI were lower than those of EPI-DWI (P<0.05), there was no significant difference in the SIR (P=0.08). ADC values of GRASE-DWI, in both normal brain tissues and infarcted areas, were higher than those of EPI-DWI (P<0.05). Misaligned distance between GRASE-DWI and EPI-DWI showed significant differences (P<0.05).Conclusions: GRASE-DWI could significantly improve DWI image quality by reducing the susceptibility artifacts and distortions.
[Keywords] diffusion-weighted imaging；gradient and spin echo；echo-planar imaging；magnetic resonance imaging；parallel imaging；stroke

LIAO Zhenhong* Department of Radiology, Peoples' Hospital of Deyang City, Deyang 618000, China

MING Bing Department of Radiology, Peoples' Hospital of Deyang City, Deyang 618000, China

MA Chun Department of Radiology, Peoples' Hospital of Deyang City, Deyang 618000, China

LIU Gaoyuan Department of Radiology, Peoples' Hospital of Deyang City, Deyang 618000, China

ZHANG Yong Department of Radiology, Peoples' Hospital of Deyang City, Deyang 618000, China

*Correspondence to: Liao ZH, E-mail: 497176526@qq.com

Conflicts of interest   None.

Received  2019-12-02
Accepted  2020-04-15
DOI: 10.12015/issn.1674-8034.2020.06.007
Cite this article as: Liao ZH, Ming B, Ma C, et al. Diffusion weighted imaging of head based on GRADE-DWI sequence. Chin J Magn Reson Imaging, 2020, 11(6): 433-437. DOI:10.12015/issn.1674-8034.2020.06.007.

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