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• Technical Article •
The causes and solutions of Swap artifacts occurring in neck DIXON sequence scanning
ZHU Kai-guo  ZHU Xiao-fei  LIU Jin  ZHANG Wei 

DOI:10.12015/issn.1674-8034.2017.11.009.


[Abstract] Objective: To explore the causes and solutions of Swap artifacts in neck DIXON sequence scanning.Materials and Methods: A retrospective analysis of 947 patients with DIXON sequence scan of the neck, classified the 137 samples with Swap artifacts by region, measured the SNR of image, used average=2, disusing parallel acquisition technique, changing the phase encoding methods to divide 133 Axial samples into 45, 45, 43 three groups, analyzed the results with χ2 test, P<0.05 was considered to have a statisticsdifferences.Results: (1) Swap artifacts mostly occurred in paranasalsinus, mandible, thyroid and skin surface. (2) The probability of occurrence of Swap artifacts with high signal-to-noise ratio (SNR) is lower than that with low SNR. (3) The probability of removal of Swap artifacts were 93.3% (42/45), 91.1% (41/45) and 53.5% (23/43), respectively. The P value of group 1/2 is 0.693, it reveals no statistically significant difference, while the P values of group 1/3 and group 2/3 are less than 0.01, and they all show a significant difference.Conclusions: The probability of occurrence of Swap artifacts is related to the homogeneity of magnetic field and the SNR of the image. The magnetic field homogeneity is high and the probability of artifacts is low. The SNR of images is high and the probability of artifacts is low. In practice, the method of increasing the SNR is superior to the method of improving the homogeneity of the magnetic field.
[Keywords] Quality improvement；Image processing, computer-assisted；Signal-to-noise ratio；Magnetic fields；Magnetic resonance imaging

ZHU Kai-guo Department of Radiology, Tangdu Hospital, the Fourth Military Medical University, Xi'an 710038, China

ZHU Xiao-fei Department of Radiology, Tangdu Hospital, the Fourth Military Medical University, Xi'an 710038, China

LIU Jin Department of Radiology, Tangdu Hospital, the Fourth Military Medical University, Xi'an 710038, China

ZHANG Wei* Department of Nuclear Medicine, Tangdu Hospital, the Fourth Military Medical University, Xi'an 710038, China

*Correspondence to: Zhang W, E-mail: 865884868@qq.com

Conflicts of interest   None.

Received  2017-06-07
Accepted  2017-08-10
DOI: 10.12015/issn.1674-8034.2017.11.009
DOI:10.12015/issn.1674-8034.2017.11.009.

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