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Open AccessArticle

Evaluation of the Swallow-Tail Sign and Correlations of Neuromelanin Signal with Susceptibility and Relaxations

1
School of Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 110, Taiwan
2
Department of Medical Imaging, Taipei Medical University Hospital, Taipei Medical University, Taipei 110, Taiwan
3
Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan
4
Translational Imaging Research Center, Taipei Medical University Hospital, Taipei 110, Taiwan
5
CT/MR Division, Rotary Trading Co., Ltd., Taipei 115, Taiwan
6
Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University and National Health Research Institutes, Taipei 110, Taiwan
7
Department of Biological Science and Technology, China Medical University, Taichung 406, Taiwan
8
Department of Electrical Engineering, National Taiwan University, Taipei 110, Taiwan
9
International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 110, Taiwan
*
Author to whom correspondence should be addressed.
Co-first authors who contributed equally to this work.
Academic Editor: Brian D. Ross
Tomography 2021, 7(2), 107-119; https://doi.org/10.3390/tomography7020010
Received: 22 March 2021 / Accepted: 22 March 2021 / Published: 27 March 2021
The presence of a swallow-tail sign in the nigrosome-1 with hyperintense signal shown on the susceptibility-weighted imaging (SWI) has been shown to be sensitive in detecting the abnormal iron deposits in this area. A systematic evaluation in healthy subjects is required before this tool can be recommended in a widespread application. We evaluated a simple and practical SWI approach using a multiecho gradient-echo sequence with an improved contrast-to-noise ratio (CNR). We also evaluated the association of the neuromelanin imaging contrast behavior with the susceptibility and relaxation measurements. Twenty-five older and 23 young healthy adults were evaluated. The CNRs of the nigrosome-1 were compared along with method and group. Correlations of the nigrosome-1 neuromelanin signal in the neuromelanin-sensitive imaging with CNRs in the susceptibility, T1 and T2 mappings were examined. Two different coils were used to confirm the reproducibility. Compared with the single-echo, multiecho SWI can improve the CNR of the swallow-tail sign. We found significant correlations between neuromelanin signal and CNRs in the susceptibility and T2 mappings, and T1 value. The older subjects exhibited increased CNRs compared with the young adults. No significant difference was observed in the measurements between 20 and 64 channels. The multiecho technique allows the high-quality nigrosome-1 images in SWI and allows for a joint analysis of T2* and quantitative-susceptibility mapping at high spatial resolution. The correlations of neuromelanin-sensitive imaging with susceptibility and T2 imply that the iron content in the nigrosome-1 may have significant influences on the hyperintensity of neuromelanin in the magnetization transfer-related contrast. View Full-Text
Keywords: susceptibility-weighted imaging; nigrosome-1; swallow-tail sign susceptibility-weighted imaging; nigrosome-1; swallow-tail sign
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MDPI and ACS Style

Lee, T.-W.; Chen, C.-Y.; Chen, K.; Tso, C.-W.; Lin, H.-H.; Lai, Y.-L.L.; Hsu, F.-T.; Chung, H.-W.; Liu, H.-S. Evaluation of the Swallow-Tail Sign and Correlations of Neuromelanin Signal with Susceptibility and Relaxations. Tomography 2021, 7, 107-119. https://doi.org/10.3390/tomography7020010

AMA Style

Lee T-W, Chen C-Y, Chen K, Tso C-W, Lin H-H, Lai Y-LL, Hsu F-T, Chung H-W, Liu H-S. Evaluation of the Swallow-Tail Sign and Correlations of Neuromelanin Signal with Susceptibility and Relaxations. Tomography. 2021; 7(2):107-119. https://doi.org/10.3390/tomography7020010

Chicago/Turabian Style

Lee, Tzu-Wei; Chen, Cheng-Yu; Chen, Kuan; Tso, Chao-Wei; Lin, Hui-Hsien; Lai, Ying-Liang L.; Hsu, Fei-Ting; Chung, Hsiao-Wen; Liu, Hua-Shan. 2021. "Evaluation of the Swallow-Tail Sign and Correlations of Neuromelanin Signal with Susceptibility and Relaxations" Tomography 7, no. 2: 107-119. https://doi.org/10.3390/tomography7020010

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