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• Original Article •
Combination of CBF and SWI for the changes of the vision areas with directional visual fatigue
WU Lifang  TANG Yilin  LUO Jinchuan  OUYANG Lin 

Cite this article as: Wu LF, Tang YL, Luo JC, et al. Combination of CBF and SWI for the changes of the vision areas with directional visual fatigue. Chin J Magn Reson Imaging, 2020, 11(7): 563-567. DOI:10.12015/issn.1674-8034.2020.07.017.


[Abstract] Objective: Functional magnetic resonance imaging (fMRI) was applied to investigated the changes of the brain vision functional areas (the occipital lobe) of different vision states (directional vision, rest with closed eyes and free vision states).Materials and Methods: Selected twenty-one healthy volunteers in this experiment. All subjects underwent experimental training and test, and the data of test phase were used as the final evaluation indexes. The experiment test was conducted by three stages in order, directional vision, rest with closed eyes and free vision states. In the stage of directional vision, the visual fatigue time (VFT) of the subject was obtained, and which was taken as the beginning time of MRI test of the subject in the three visual states. Cerebral blood flow (CBF) and susceptibility weighted imaging (SWI) were combined to assess the changes of blood flow and oxygen saturation of the visual cortex in three visual states. Univariate ANOVA analysis was used to analyze the differences between the observed values of three groups.Results: After training, VFT was extended (35±15) s in training phase and (50±6) s in test phase (P=0.07). Taken the state of rest with closed eyes as the baseline, the free vision had an marked increased CBF of the visual cortex (P=0.05), but directional vision presented a significant decrease of CBF (P<0.001). SWI phase value characteristically displayed an orderly increasing trend in three vision states of rest with closed eyes, free vision and directional vision. Directional vision presented a marked rise of averaged SWI phase value than free vision (P=0.03) and than rest with closed eyes (P=0.02).Conclusions: Quick decline of blood flow and oxygen saturation of the brain vision functional areas in directional visual state might be the physiological basis for its prone to fatigue.
[Keywords] vision fatigue；brain vision functional areas；functional magnetic resonance imaging；cerebral blood flow；susceptibility weighted imaging

WU Lifang The 909th Hospital of PLA, Southeast affiliated hospital of xiamen university, Institute of medical imaging, Medical college of xiamen university, Zhangzhou 363000, China

TANG Yilin The 909th Hospital of PLA, Southeast affiliated hospital of xiamen university, Institute of medical imaging, Medical college of xiamen university, Zhangzhou 363000, China

LUO Jinchuan The 909th Hospital of PLA, Southeast affiliated hospital of xiamen university, Institute of medical imaging, Medical college of xiamen university, Zhangzhou 363000, China

OUYANG Lin* The 909th Hospital of PLA, Southeast affiliated hospital of xiamen university, Institute of medical imaging, Medical college of xiamen university, Zhangzhou 363000, China

*Correspondence to: Ouyang L, E-mail: ddcqzg@126.com

Conflicts of interest   None.

ACKNOWLEDGMENTS  Natural Science Foundation of Fujian Province No. 2015J05119 China Postdoctoral Science Foundation No. 2015T81135 Military Medical and Health Research Fund No. 2013ZX20
Received  2019-12-07
Accepted  2020-05-20
DOI: 10.12015/issn.1674-8034.2020.07.017
Cite this article as: Wu LF, Tang YL, Luo JC, et al. Combination of CBF and SWI for the changes of the vision areas with directional visual fatigue. Chin J Magn Reson Imaging, 2020, 11(7): 563-567. DOI:10.12015/issn.1674-8034.2020.07.017.

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