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• Technical Article •
Value of frequency offset in image quality optimization of fast spin echo T1WI SPIR fat suppression sequence for pediatric thoracic spine MRI
LÜ Yanqiu  WANG Wei  GAO Shuaiyi  HU Di  ZHENG Dandan  PENG Yun 

LÜ Y Q, WANG W, GAO S Y, et al. Value of frequency offset in image quality optimization of fast spin echo T1WI SPIR fat suppression sequence for pediatric thoracic spine MRI[J]. Chin J Magn Reson Imaging, 2023, 14(8): 108-112, 117. DOI:10.12015/issn.1674-8034.2023.08.017.


[Abstract] Objective To optimize frequency offset of T1WI spectral pre-saturation with inversion recovery (SPIR) fat suppression sequence and improve the image quality of T1WI SPIR fat suppression sequence for thoracic spine.Materials and Methods Retrospective subjective and objective image quality evaluation for 9 T1WI SPIR fat suppression sequences with different frequency offsets (40, 60, 80, 100, 120, 127, 140, 160, 180 Hz) were performed in 36 children with thoracic spine MRI. Two senior radiologists used a 4-point scale to score subjective image quality of the 9 T1WI SPIR sequences, including the homogeneity of vertebral and back fat suppression, and overall image quality. The signal to noise ratio (SNR) of the vertebra, cerebrospinal fluid, intervertebral disc, and spinal cord, and the contrast to noise ratio (CNR) among the them were calculated. Kruskal-Wallis non-parametric test was used to evaluate subjective image quality scores, and one-way analysis of variance was used to evaluate SNR and CNR, LSD used for pairwise comparison among groups.Results (1) There were significant differences in the homogeneity of the vertebral fat suppression (F=168.49, P＜0.001), homogeneity of the back fat suppression (F=96.10, P＜0.001) and overall image quality (F=27.11, P＜0.001) among 9 T1WI SPIR sequences with different frequency offsets. The 4 sequences, with the frequency offsets of 40, 60, 80 and 100 Hz, showed best homogeneity of the vertebral, and there were no significant differences. The 5 sequences, with frequency offsets of the 100, 120, 127, 140 and 160 Hz, showed best homogeneity of the back fat suppression, and there were no significant differences. The 2 sequences, with the frequency offsets of 80 and 100 Hz, showed best overall image quality, and there were no significant differences. (2) There were significant differences in the SNR of vertebra (F=2.83, P＜0.05) and CNR between vetebra and cerebrospinal fluid (F=2.67, P＜0.05) among 6 T1WI SPIR sequences with different frequency offsets. The 3 sequences, with the frequency offset of 40, 60, 80 Hz, had no significant differences in the SNR of vertebra and CNR between vetebra and cerebrospinal fluid, and T1WI SPIR sequence with frequency offset of 40 Hz had higher the SNR of vertebra and CNR between vertebra and cerebrospinal fluid than that of T1WI SPIR sequences with frequency offsets of 100, 120, 127 Hz. There were no significant difference in the SNR and CNR of the remaining studied tissues for the 6 sequences.Conclusions When the frequency offsets were 80 and 100 Hz, the overall image quality of T1WI SPIR sequence of thoracic spine could be improved.
[Keywords] thoracic spine disease；fat suppression；image quality；children；fast spin echo；magnetic resonance imaging

LÜ Yanqiu1   WANG Wei1   GAO Shuaiyi1   HU Di1   ZHENG Dandan2   PENG Yun1*  

1 Department of Radiology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China

2 Department of Clinical & Technical Support, Philips Healthcare, Beijing 100600, China

Corresponding author: Peng Y, E-mail: ppengyun@yahoo.com

Conflicts of interest   None.

Received  2023-03-27
Accepted  2023-07-21
DOI: 10.12015/issn.1674-8034.2023.08.017
LÜ Y Q, WANG W, GAO S Y, et al. Value of frequency offset in image quality optimization of fast spin echo T1WI SPIR fat suppression sequence for pediatric thoracic spine MRI[J]. Chin J Magn Reson Imaging, 2023, 14(8): 108-112, 117. DOI:10.12015/issn.1674-8034.2023.08.017.

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