Abstract
Objectives
To assess the feasibility of low-dose contrast-enhanced four-dimensional (4D) time-resolved angiography with stochastic trajectories (TWIST) with iterative reconstruction (hereafter IT-TWIST-MRA) covering the whole brain and to compare IT-TWIST-MRA and TWIST-MRA with reference to digital subtraction angiography (DSA) in the evaluation of arteriovenous shunts (AVS).
Methods
Institutional Review Board approval was obtained for this observational study, and the requirement for written informed consent was waived. Twenty-nine patients with known AVS underwent TWIST-MRA on a 3-T MRI scanner, using low-dose injection (0.02 mmol/kg) of gadolinium-based contrast agent (GBCA) with each of Fourier and iterative reconstruction between September 2016 and October 2019. Visual evaluation of image quality was conducted for delineation of (a) the normal cerebral arteries and veins and (b) AVS feeder, shunt, and drainer vessels. Region-of-interest evaluation was conducted to evaluate bolus sharpness and baseline signal fluctuation in the signal intensity of the cerebral vessels. We compared the detection of AVS between TWIST-MRA and IT-TWIST-MRA. The paired-samples Wilcoxon test was used to test the differences between TWIST-MRA and IT-TWIST-MRA.
Results
Visualization scores for normal vasculature and AVS angioarchitecture were significantly better for images produced using IT-TWIST-MRA than those using TWIST-MRA. Peak signal and the enhancement slope of the time-intensity curve were significantly higher for IT-TWIST-MRA than for TWIST-MRA, except for the superior sagittal sinus (SSS). Baseline intensity fluctuation was significantly lower for IT-TWIST-MRA than for TWIST, except for SSS.
Conclusions
IT-TWIST-MRA yields clinically feasible 4D MR-DSA images and delineates AVS even with low-dose GBCA.
Key Points
• Iterative reconstruction significantly improves the image quality of TWIST-MRA covering the whole brain.
• The short temporal footprint and denoising effect of iterative reconstruction enhances the quality of 4D-MRA.
• IT-TWIST-MRA yields clinically feasible images of AVS with low-dose GBCA.
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Abbreviations
- 4D-MR-DSA:
-
Four-dimensional magnetic resonance digital subtraction angiography
- AVF:
-
Arteriovenous fistula
- AVM:
-
Arteriovenous malformation
- AVS:
-
Arteriovenous shunts
- DSA:
-
Digital subtraction angiography
- GBCA:
-
Gadolinium-based contrast agents
- ICA:
-
Internal carotid artery
- ICC:
-
Intraclass correlation coefficients
- ICH:
-
Intracranial hemorrhage
- IT-TWIST-MRA:
-
Time-resolved angiography with interleaved stochastic trajectories with iterative reconstruction
- MCA:
-
Middle cerebral artery
- MSC:
-
Maximal signal change
- SSS:
-
Superior sagittal sinus
- TWIST-MRA:
-
Time-resolved angiography with interleaved stochastic trajectories
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Funding
This work was supported by JSPS KAKENHI Grant Number JP18K07711, 19K17266, 21K15623, 21K15826, and The Kyoto University Research Fund for Young Scientist Start-Up) FY2020.
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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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This retrospective study was approved by local institutional review boards and written informed consent was waived.
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All authors declare that they have no conflict of interest, except Michaela Schmidt and Jens Wetzl who are employees of Siemens Healthcare GmbH.
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The scientific guarantor of this publication is Yuji Nakamoto.
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observational
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performed at one institution
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Sakata, A., Sakamoto, R., Fushimi, Y. et al. Low-dose contrast-enhanced time-resolved angiography with stochastic trajectories with iterative reconstruction (IT-TWIST-MRA) in brain arteriovenous shunt. Eur Radiol 32, 5392–5401 (2022). https://doi.org/10.1007/s00330-022-08678-7
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DOI: https://doi.org/10.1007/s00330-022-08678-7