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Technical Article
The effect of different compressed sensing factors on analysis of "swallow tail sign" in cerebral SWI
YANG Jing  LIU Yangyingqiu  LIU Na  GAO Bingbing  SONG Qingwei  ZHANG Haonan  MIAO Yanwei 

Cite this article as: Yang J, Liu YYQ, Liu N, et al. The effect of different compressed sensing factors on analysis of "swallow tail sign" in cerebral SWI[J]. Chin J Magn Reson Imaging, 2022, 13(5): 89-93. DOI:10.12015/issn.1674-8034.2022.05.016.


[Abstract] Objective To compare the effect of different acceleration factors (AF) of compressed sensing (CS) susceptibility weighted imaging (SWI) on "swallow tail sign (STS)" in midbrain, and to find the optimal AF.Materials and Methods Prospectively included forty health volunteers underwent MR examinations in a 3.0 T magnetic resonance imaging scanner. The MRI protocol included routine SWI sequence with CS of different AFs (AF=0 and CS2, CS4, CS6, CS8, CS10). Phase images of SWI were obversed and measured. The phase value (PV) was measured. The signal to noise ratio (SNR) and contrast to noise ratio (CNR) were calculated. Recording the number of STS with different AFs. The interobserver reliability of subjective scoring on SN and STS were assessed by the Cohen's Kappa test. The interclass correlation cofficient (ICC) for PV and subjective scoring were employed. The difference in the number of STS was analyzed by Fisher's exact test. The least-significant difference (LSD) of one-way analysis of variance (ANOVA) was used to compare the difference in image quality and PV with different AFs. The P values were corrected by the false discovery rate (FDR) of Benjamini-Hochberg method. The corrected P<0.05 were considered significant.Results The consistency between two observers of subjective rating was excellent (Kappa>0.80). The ICC on PV and subjective rating were excellent (ICC>0.80). When AF≥6, the resolution on STS decreased significantly. The number of STS decreased with the AF increases, in other words, the STS diaplaying rate was gradually decreased, and there was significant difference (P<0.05). The SNR and CNR of bilateral SNs in AF>2 were significant difference (P<0.05). When AF>4, the SNR and CNR of bilateral STSs showd significant difference (P<0.05).Conclusions According to the quantitative data on brain SWI, combine the SNR, CNR, subjective rating and the displaying rate with different AFs, CS4 can be used to obsreve the STS, and the scanning time is reduced by 70.7% (4 min 9 s).
[Keywords] susceptibility weighted imaging;compressed sensing;swallow tail sign;acceleration factor;image quality

YANG Jing   LIU Yangyingqiu   LIU Na   GAO Bingbing   SONG Qingwei   ZHANG Haonan   MIAO Yanwei*  

Department of Radiology, the First Affiliated Hospital of Dalian Medical University, Dalian 116011, China

Miao YW, E-mail: ywmiao716@163.com

Conflicts of interest   None.

Received  2021-10-14
Accepted  2022-04-28
DOI: 10.12015/issn.1674-8034.2022.05.016
Cite this article as: Yang J, Liu YYQ, Liu N, et al. The effect of different compressed sensing factors on analysis of "swallow tail sign" in cerebral SWI[J]. Chin J Magn Reson Imaging, 2022, 13(5): 89-93.DOI:10.12015/issn.1674-8034.2022.05.016

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