Spectral aortoiliac photon-counting CT angiography with minimal quantity of contrast agent
Stephan Rau1,2, Martin Soschynski1,2, Christopher L Schlett1,2
1Department of Diagnostic and Interventional Radiology, Medical Center - University of Freiburg, Hugstetter Straße 55, 79106 Freiburg im Breisgau, Germany.
Insights
Photon-counting CT scanners enable reduced contrast material for vascular imaging, especially for patients with renal issues. This innovation offers diagnostic confidence while minimizing risks of kidney damage.
Area of Science:
- Radiology
- Medical Imaging
- Vascular Imaging
Background:
- Increasing incidence of vascular and renal pathologies necessitates advanced imaging techniques.
- Growing aging population with chronic renal failure requires reduced contrast material in scans.
- Need for effective preventative scan protocols with reduced contrast agents is pressing.
Observation:
- An 81-year-old female patient with incipient chronic renal failure underwent contrast-enhanced aortoiliac computed tomography angiography.
- A first-generation clinical photon-counting detector CT scanner was utilized for the procedure.
- The scan involved dual-source spectral image acquisition and dynamic monochromatic reconstruction near Iodine's K-edge.
Findings:
- Photon-counting CT scanner allowed a modified protocol with significantly reduced contrast agent.
- Diagnostic confidence was preserved despite the reduced contrast material.
- No loss of temporal or spatial resolution was observed during the scan.
Implications:
- This approach shows promise for vascular imaging with reduced risk of renal damage.
- Further research into optimal scan protocols and post-processing for photon-counting CT is warranted.
- Potential to improve safety and efficacy of computed tomography angiography in patients with compromised renal function.
Abstract:
The incidence of vascular and especially aortic pathologies is increasing, which leads to a higher frequency of vascular imaging. As renal pathologies also become more frequent, especially in an aging population, the need for effective preventative scan protocols with reduced contrast material is pressing. An 81-year-old female patient in our institution required a follow-up imaging of an incidental, asymptomatic abdominal aortic aneurysm. Although the patient was suffering from incipient chronic renal failure, a contrast-enhanced aortoiliac computed tomography angiography was performed using a first generation, clinical photon-counting detector computed tomography scanner. This scanner allows a modified scan protocol with a significant reduction of contrast agent while preserving diagnostic confidence. Technically, this is feasible by dual-source spectral image acquisition and dynamic monochromatic reconstruction near the K-edge of Iodine without loss of temporal or spatial resolution. The results are promising, allowing vascular imaging with significantly less risk of renal damage. In this regard, further research into optimal scan-protocols and post-processing is needed.
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