Exploration of different echo times in short repetition time T2-fluid attenuated inversion recovery sequences and their effects on brain gray and white matter contrast
10.3969/j.issn.1002-1671.2025.02.003
- VernacularTitle:不同回波时间在短重复时间的T2-液体衰减反转恢复序列中对脑灰白质对比度的影响
- Author:
Xiao PENG
1
;
Nian ZHAO
1
;
Peng MIN
1
;
Jiajia XU
1
Author Information
1. 国药东风总医院影像科,湖北 十堰 442000
- Publication Type:Journal Article
- Keywords:
T2-fluid attenuated inversion recovery;
echo time;
brain gray and white matter;
contrast;
signal-to-noise ratio
- From:
Journal of Practical Radiology
2025;41(2):190-193
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the use of T2-fluid attenuated inversion recovery(FLAIR)sequences with a shorter TR to significantly reduce examination time without compromising diagnostic accuracy and image quality,and to obtain satisfactory brain gray and white matter contrast images via adjusting the TE.Methods A total of 60 patients underwent brain MR were selected,and each patient was scanned using two different T2-FLAIR sequences.The scan parameters for sequence A group were TR 9 000 ms,inversion time(TI)2 500 ms,and TE 120 ms.For sequence B group,the scan parameters were TR 6 000 ms,TI 2 000 ms,and TE 120-200 ms(with 20 ms intervals),respectively,and all images data were labeled as B1 to B5.A double-blind method was used to observe the images from both groups,with a 5-point rating scale.The signal-to-noise ratio(SNR),contrast-to-noise ratio(CNR)of brain gray and white matter,and the contrast of brain gray and white matter were measured,respectively.SPSS 26.0 statistical software was used for subjective and objective evaluations of the images from both groups.Results For subjective evaluation,there were statistically significant differences in image quality with TE ranged from 120 to 200 ms in B group(H=41.4,P＜0.05).In pairwise comparisons,images from B3 group(TE 160 ms)showed no statistically significant difference compared to A group in subjective evaluations by two physicians(P＞0.05).For objective evaluation,A group exhibited significantly higher SNR compared to B group.Among the images in B group with TE ranged from 120 to 200 ms,SNR decreased gradually with increased TE,while CNR and contrast increased progressively(P＜0.05).Specifically,there were no statistically significant differences between B3 and A groups in terms of CNR and contrast(P＞0.05).Conclusion T2-FLAIR sequences with a shorter TR can significantly reduce examination time.By adjusting the TE,satisfactory brain gray and white matter contrast images can be obtained.When TE is 160 ms,the contrast of brain gray and white matter is optimal,and the SNR of the images meets the requirements for clinical diagnosis.
