Abstract
Purpose
To evaluate the feasibility of Quantitative Ultrashort-Time-to-Echo Contrast-Enhanced (QUTE-CE) MRA using ferumoxytol as a contrast agent for abdominal angiography in the kidney.
Methods
Four subjects underwent ferumoxytol-enhanced MRA with the 3D UTE Spiral VIBE WIP sequence at 3 T. Image quality metrics were quantified, specifically the blood Signal-to-Noise Ratio (SNR), blood-tissue Contrast-to-Noise Ratio (CNR) and Intraluminal Signal Heterogeneity (ISH) from both the aorta and inferior vena cava (IVC). Morphometric analysis of the vessels was performed using manual approach and semi-automatic approach using Vascular Modeling ToolKit (VMTK). Image quality and branching order were compared between QUTE-CE MRA and the Gadolinium (Gd) CEMRA reference image.
Results
QUTE-CE MRA provides a bright blood snapshot that delineates arteries and veins equally in the same scan. The maximum SNR and CNR values were 3,282 ± 1,218 and 1,295 ± 580, respectively – significantly higher than available literature values using other CEMRA techniques. QUTE-CE MRA had lower ISH and depicted higher vessel branching order (7th vs 3rd) within the kidney compared to a standard dynamic clinical Gd CEMRA scan. Morphometric analysis yielded quantitative results for the total kidney volume, total cyst volume and for diameters of the branching arterial network down to the 7th branch. Vessel curvature was significantly increased (p < 0.001) in the presence of a renal cyst compared to equivalent vessels in normal kidney regions.
Conclusion
QUTE-CE MRA is feasible for kidney angiography, providing greater detail of kidney vasculature, enabling quantitative morphometric analysis of the abdominal and intra-renal vessels and yielding metrics relevant to vascular diseases while using a contrast agent ferumoxytol that is safe for CKD patients.
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Availability of data and material
All data analyzed during this study were included in this manuscript and its supplementary information.
Code availability
Advanced Normalization Toolkit (ANTS, http://stnava.github.io/ANTs/), 3D Slicer (http://www.slicer.org), Vascular Modeling ToolKit (VMTK, www.vmtk.org).
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Acknowledgments
We acknowledge Dr. John E. Kirsch for helpful advice on experimental setup.
Funding
This study was funded by National Institutes of Health (Grant numbers 1R41DA043974-01 and 1R21DK118449-01).
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LT, MH and SS contributed to the study concept and design. LT, JQ, RML, VM, AA, GVJ and MH contributed to data acquisition. Data analysis were performed by LT, TZ and YL. The manuscript was drafted by LT, TZ and SS. Critical editing and revision of the manuscript was done by LT, TZ, SS, RTS, and DD. All authors read and approved the final manuscript.
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RTS reports personal fees from Siemens Medical Solutions, Inc., outside the submitted work. SS reports grants from Theranano LLC and grants from Northeastern University, during the conduct of the study; In addition, SS has a patent WO2017019182A1 pending.
Ethical approval
This study was conducted with approval by the Massachusetts General Hospital Institutional Review board IRB:2017P001262. All procedures performed in the study involving human participants were Heal Insurance Portability and Accountability Act (HIPAA) compliant.
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Subjects provided informed written consent for the imaging procedure which is an off-label use of ferumoxytol.
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Timms, L., Zhou, T., Lyu, Y. et al. Ferumoxytol-enhanced ultrashort TE MRA and quantitative morphometry of the human kidney vasculature. Abdom Radiol 46, 3288–3300 (2021). https://doi.org/10.1007/s00261-021-02984-2
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DOI: https://doi.org/10.1007/s00261-021-02984-2