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Synthetic phase-sensitive inversion-recovery vessel for assessing extramural venous invasion in patients with rectal cancer: imaging quality and added value to T2-wighted imaging

  • Magnetic Resonance
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European Radiology Aims and scope Submit manuscript

Abstract

Objectives

To evaluate the imaging quality of a synthetic phase-sensitive inversion recovery (SyPSIR) vessel and to add value to T2-weighted imaging (T2WI) for extramural venous invasion (EMVI) detection in patients with rectal cancer.

Methods

Participants in this retrospective study underwent preoperative synthetic MRI between October 2020 and April 2022. SyPSIR image reconstruction was performed with a single inversion time of 10 ms. A junior and a senior radiologist evaluated the imaging quality, including overall imaging quality scores, motion artifact scores, and relative image signal intensity contrast between the tumor and peritumoral vessels (SItumor-vessel), of both T2WI and SyPSIR vessels. Differences in imaging quality between the two methods were assessed using the Wilcoxon signed-rank test and two-sample t-test. EMVI scores were recorded for T2WI and T2WI+SyPSIR vessel. The area under the receiver operating characteristic curve (AUC) was calculated to evaluate the diagnostic performance.

Results

A total of 106 patients (35 EMVI+ and 71 EMVI−) were evaluated. There were no statistically significant differences in the overall image quality scores, motion artifacts, or SItumor-vessel (p = 0.08–0.93) between the T2WI and SyPSIR vessels. On combining T2WI and SyPSIR vessels, the AUC for pathological EMVI+ diagnoses increased from 0.65 to 0.88 for the junior radiologist and from 0.86 to 0.96 for the senior radiologist. Furthermore, the sensitivity of the analyses by junior and senior radiologists increased from 0.40 to 0.77 and 0.49 to 0.86, respectively.

Conclusion

A SyPSIR vessel can provide additional information to improve the diagnostic efficiency of pathological EMVI in rectal cancer, which may be beneficial for individualized clinical treatment.

Key Points

SyPSIR vessel and T2WI had similar imaging quality.

EMVI evaluation in SyPSIR vessel has a high inter-observer agreement.

The SyPSIR vessel has the potential to improve the diagnostic efficiency of EMVI detection in rectal cancer.

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Abbreviations

ADC:

Apparent diffusion coefficient

AUC:

The area of the receiver operating curve

EMVI:

Extramural venous invasion

EMVI-:

Negative EMVI

EMVI+:

Positive EMVI

ICC:

Intraclass correlation coefficient

MAGiC:

Magnetic resonance imaging compilation

pEMVI:

Pathological EMVI

PSIR:

Phase-sensitive inversion recovery

SI:

Signal intensity

SyPSIR:

synthetic phase sensitivity inversion recovery

SyT2WI:

Synthetic T2WI

T2WI:

T2-weighted imaging

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Acknowledgments

We thank Ke-wei Wang for helping with the statistical analysis of the data in this paper. We thank Zi Wang, Xin-yi Zhou, and Bo-jian Fei for their contributions to patient treatment data collection. All authors had access to the study data, and reviewed and approved the final manuscript.

Funding

This study was funded by the Wuxi Science and Technology Development Fund (Grant No. Y20212019).

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Correspondence to Rongping Guan or Shudong Hu.

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Guarantor

The scientific guarantor of this publication is Shu-dong Hu, M.D., Ph.D.

Conflict of interest

The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

Ke-wei Wang kindly provided statistical advice for this manuscript.

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Written informed consent was waived by the Institutional Review Board.

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Institutional Review Board approval was obtained.

Methodology

• retrospective

• diagnostic study

• performed at one institution

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Ge, Y., Jia, Y., Li, Y. et al. Synthetic phase-sensitive inversion-recovery vessel for assessing extramural venous invasion in patients with rectal cancer: imaging quality and added value to T2-wighted imaging. Eur Radiol 33, 4148–4157 (2023). https://doi.org/10.1007/s00330-022-09344-8

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  • DOI: https://doi.org/10.1007/s00330-022-09344-8

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