Abstract
Advanced CT scanners produce high-resolution datasets. With the use of image post-processing tools, reconstructions are made in any direction, and three-dimensional models are generated for time-effective image analysis. Because of the non-invasive character of CTA and high resolution images, CTA has become the diagnostic method of choice in peripheral artery disease. Overall this results in an increased exposure to radiation and a higher incidence of allergic and contrast-induced nephrotoxic reactions. By adjusting the acquisition parameters on a patient-to-patient basis, specific protocols can be created reducing radiation and contrast exposure without compromising image quality.
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Review Questions
Review Questions
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In modern CT scanners, spatial resolution is determined by scan range.
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The theoretical advantage of a dual energy CT scanner is the ability to discriminate between calcium and contrast based upon differences in x-ray attenuation.
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MIP (maximum intensity projection) reconstructions rely on the difference in attenuation factor between calcium, iodine and remaining soft tissue to identify voxels containing blood (lumen), thrombus or calcium, a technique called segmentation. This results in three-dimensional models of the peripheral artery lumen and wall.
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A clear trade-off exists between radiation exposure and image quality. Traditional peripheral CTA uses a tube voltage of 120 kVp. By reducing the tube voltage to 80 kVp, radiation exposure in patients with peripheral artery disease is decreased; this however compromises image quality and diagnostic performance.
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Contrast-induced nephropathy (CIN) is rare (0.02–0.04%) but potentially life-threatening.
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Hydration increases urine flow rate resulting in faster contrast media excretion and shorter contrast exposure. Today, hydration with standard saline is the most common preventive measure. Hydration with sodium bicarbonate however results in a significant decrease in the incidence of CIN.
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In patients with peripheral artery disease, the diagnostic performance of CTA exceeds the specificity and sensitivity of MRA.
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False
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Truijers, M., Blankensteijn, J.D. (2017). Computed Tomographic Angiography in the Diagnosis of Peripheral Arterial Disease. In: AbuRahma, A. (eds) Noninvasive Vascular Diagnosis. Springer, Cham. https://doi.org/10.1007/978-3-319-54760-2_61
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DOI: https://doi.org/10.1007/978-3-319-54760-2_61
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