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• Technical Article •
The value of SEMAC-VAT imaging in the post-operative imaging of spine reconstruction surgery with 3D-printed vertebral body
ZHAO Qiang  SUN Xingwen  ZHANG Lihua  YE Kai  HAN Songbo  OUYANG Hanqiang  YUAN Huishu 

Cite this article as: ZHAO Q, SUN X W, ZHANG L H, et al. The value of SEMAC-VAT imaging in the post-operative imaging of spine reconstruction surgery with 3D-printed vertebral body[J]. Chin J Magn Reson Imaging, 2023, 14(1): 130-135. DOI:10.12015/issn.1674-8034.2023.01.023.


[Abstract] Objective To explore the value of slice-encoding metal artifact corrections-view-angle tilting (SEMAC-VAT) sequences in the post-operative imaging of spine reconstruction surgery with a 3D-printed vertebral body (VB).Materials and Methods Seventeen patients with 3D-printed VB underwent spinal MRI with T2 turbo-spin-echo (TSE) and T2-weighted SEMAC-VAT sequences. The evaluation was performed by two musculoskeletal radiologists by assessing the artifact size, the signal-to-noise ratio (SNR), and the visibility of the critical anatomical structures close to metal implants. Paired t tests, independent t tests, and Wilcoxon signed-rank tests were used for comparisons, and Kappa values were used for interobserver agreement.Results SEMAC-VAT images demonstrated significantly reduced longitudinal [(4.8±6.3) mm vs. (15.4±14.5) mm, P＜0.01] and anterior-posterior [(3.1±7.5) mm vs. (9.0±9.1) mm, P＜0.01] diameters of the artifacts and improved visibility of the periprosthetic anatomical structures compared with conventional TSE images. The visibility of the spinal canal is comparable between TSE and SEMAC-VAT images. SNRs of the periprosthetic anatomical structures in SEMAC-VAT images are significantly lower than in TSE images.Conclusions SEMAC-VAT imaging could reduce the size of the metal artifact and improve the visibility of most periprosthetic anatomical structures in patients after spine reconstruction surgery using a 3D-printed VB. SEMAC-VAT imaging may thus improve the diagnostic efficacy of post-operative imaging of spine reconstruction surgery with a 3D-printed VB.
[Keywords] malignancy tumor of spine；vertebrectomy；artificial vertebral body；artifact；magnetic resonance imaging

ZHAO Qiang1   SUN Xingwen1   ZHANG Lihua1   YE Kai1   HAN Songbo1   OUYANG Hanqiang2   YUAN Huishu1*  

1 Department of Radiology, Peking University Third Hospital, Beijing 100191, China

2 Department of Orthopaedics, Peking University Third Hospital, Beijing 100191, China

Corresponding author: Yuan HS, E-mail: huishuy@bjmu.edu.cn

Conflicts of interest   None.

Received  2022-03-08
Accepted  2022-11-29
DOI: 10.12015/issn.1674-8034.2023.01.023
Cite this article as: ZHAO Q, SUN X W, ZHANG L H, et al. The value of SEMAC-VAT imaging in the post-operative imaging of spine reconstruction surgery with 3D-printed vertebral body[J]. Chin J Magn Reson Imaging, 2023, 14(1): 130-135. DOI:10.12015/issn.1674-8034.2023.01.023.

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