Introduction: Two different medical imaging modalities – digital subtract angiography and computed tomography angiography – are used for detection of brain aneurysms. They both offer us their advantages and disadvantages, therefore it is important, that we are familiar with differences, which are provided to us by the final result – the image. Purpose: To determine differences in display of blood vessels of the brain and aneurysm in terms of visibility and accuracy. From a practical point of view, we want to determine which imaging method is more useful. Methods: Native CT and CTA were both performed with Siemens Somatom Sensation Open. Intravenous cannulation was used to apply 60ml of Iomeron 400mgI/ml with flow of 4ml/s. Angiography machine Siemens Axiom Artis dBA has enabled us, with combination of Seldinger approach and contrast agent Visipaque 320mgI/ml, to perform DSA and 3D rotational angiography. Results: In case of having an emergency patient with the brain aneurysm, the native CT scan of the head is performed in the first place. Because we detected subarachnoid hemorrhage, CTA represents further scan because of its quick and non-invasive performance, with which we discovered two aneurysms, but missed a small one in sublingual area. DSA discovered that two millimeter aneurysm, offers more accurate anatomical information, especially in discovering aneurysms in the above-mentioned area. Discussion: After we checked results while referring to theoretical background, we realized that we confirmed all the statements regarding CTA and DSA which are mentioned in Introduction. It is not good to guess which imaging technique is better because they both complement each other and cannot be replace by each other. Conclusion: Because of its speed, easy accessibility and lower invasiveness, CTA remains primary imaging method for aneurysm detecting, but DSA remains a gold standard for displaying a pathology, particularly aneurysms, in blood vessels of the brain. The big advantage of DSA is that we can use it for planning a treatment because it allows us to measure hemodynamic flow in real time through the area that should be treated. CTA and DSA complement each other; with first one we make a diagnosis, with second one we perform the medical treatment.
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