Abstract
Objective
This paper evaluates a prototype flat-panel volume CT (fpVCT) for dynamic in vivo imaging in a variety of neurovascular and lower limb applications.
Methods
Dynamic CTA was performed on 12 patients (neuro = 8, lower limb = 4) using an fpVCT with 120 kVp, 50 mA, rotation time varying from 8 to 19 s, and field of view of 25 × 25 × 18 cm3. Four-dimensional data sets (i.e. 3D images over time) were reconstructed and reviewed.
Results
Dynamic CTA demonstrated sufficient spatio-temporal resolution to elucidate first-pass and recirculation dynamics of contrast bolus through neurovasclaur pathologies and phasic blood flow though lower-limb vasculature and grafts. The high spatial resolution of fpVCT resulted in reduced partial volume and metal beam-hardening artefacts. This facilitated assessment of vascular lumen in the presence of calcified plaque and evaluation of fractures, especially in the presence of fixation hardware. Evaluation of arteriovenous malformation using dynamic fpVCT angiography was of limited utility.
Conclusions
Dynamic CTA using fpVCT can visualize time-varying phenomena in neuro and lower limb vascular applications and has suffcient diagnostic imaging quality to evaluate a number of pathologies affecting these regions.
Key Points
• CTA using fpVCT has sufficient spatial and temporal resolution to study phasic blood flow.
• CTA using fpVCT reveals recurrence of aneurysms even after clipping/coiling.
• fpVCT has reduced partial volume and metal beam-hardening artefacts.
• fpVCT can show vessel lumen in the presence of calcified plaque.
• CTA using fpVCT can demonstrate vascular supply to transplanted grafts.
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Abbreviations
- CTA:
-
CT angiogram
- DSA:
-
Digital subtraction angiography
- fpVCT:
-
Flat-panel volume CT
- MDCT:
-
Multi-detector computer-assisted tomography
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Acknowledgements
We want to thank Drs. B.H. Sapkota, C. Phan, and S. Iqbal for their help in patient recruitment and scanning, Dr. C. Leidecker for technical support, and Ms. J. Miller for proofreading this paper.
The scientific guarantor of this publication is Dr. Rajiv Gupta, Radiology, MGH, Boston. R. Gupta’s research was partially supported by a research grant from Siemens Healthcare (MGH-2010-CT-35702), Defense Advanced Research Projects Agency (N66001-11-1-4204), and US Army Medical Research Acquisitions (W81XWH-09-2-0001). Michael Grasruck is an employee at Siemens Healthcare, Forchheim, Germany. Amit Mehndiratta, James D. Rabinov, Eric C. Liao, and David Crandell declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional review board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Methodology: prospective, diagnostic or prognostic study, performed at one institution.
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Mehndiratta, A., Rabinov, J.D., Grasruck, M. et al. High-resolution dynamic angiography using flat-panel volume CT: feasibility demonstration for neuro and lower limb vascular applications. Eur Radiol 25, 1901–1910 (2015). https://doi.org/10.1007/s00330-015-3612-8
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DOI: https://doi.org/10.1007/s00330-015-3612-8