Investig Magn Reson Imaging.  2019 Dec;23(4):341-350. 10.13104/imri.2019.23.4.341.

Parameters Affecting India Ink Artifacts on Opposed-Phase MR Images

Affiliations
  • 1Department of Radiology, Dong-A University Medical Center, Busan, Korea. hdhdoc@dau.ac.kr

Abstract

PURPOSE
To determine the MR parameters affecting India ink artifacts on opposed-phase chemical shift magnetic resonance (MR) imaging.
MATERIALS AND METHODS
The use of a female Sprague-Dawley rat was approved by our Institutional Animal Care and Use Committee. Using an iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) images, which is a modified Dixon method, axial opposed-phase images of the abdominal cavity were obtained with different MR parameters: series 1, different repetition times (TRs; 400, 2000, and 4000 ms); series 2, different echo times (TEs; 10, 50, and 100 ms); series 3, different field of views (FOVs; 6, 8, 16, and 24 cm); series 4, different echo train lengths (ETLs; 2, 4, and 8); series 5, different bandwidths (25, 50, and 85); and series 6, different slice thicknesses (1, 2, 4, 8, and 16 mm). Artifacts on opposed images obtained with different parameters were compared subjectively by two radiologists. For objective analysis, the thickness of the artifact was measured. Spearman's correlation between altered MR parameters and thicknesses of India ink artifact was obtained via objective analysis.
RESULTS
India ink artifact was increasingly apparent using shorter TE, larger FOV and ETL, and thicker slices upon subjective analysis. The objective analysis revealed a strong negative correlation between the thickness of the artifact and TE (r = -0.870, P < 0.01); however, strong positive correlations were found between FOV (r = 0.854, P < 0.01) and slice thickness (r = 0.971, P < 0.01).
CONCLUSION
India ink artifact was thicker with shorter TE, larger FOV, and larger slice thickness.

Keyword

India ink artifact; Dixon; Chemical shift

MeSH Terms

Abdominal Cavity
Animals
Artifacts*
Female
Humans
India*
Ink*
Methods
Rats
Rats, Sprague-Dawley
Water
Water
Full Text Links
  • IMRI
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error