Abstract
Iodine-containing contrast agents are currently used for angiography. However, due to the relatively low atomic number of iodine, imaging must be performed with a relatively low tube voltage. Gadolinium has been used for several years as a contrast agent in MRI with low adverse side effects. This substance has a higher atomic number as compared with iodine. We investigated whether the use of a gadolinium-containing contrast agent with a higher tube voltage reduces the radiation exposure in angiography, and how the image quality compares with the previous technique. A total of 15 patients were examined with either a survey angiography or a selective angiography. In all patients angiography was performed with an iodine-containing contrast agent with a tube voltage of 75 kV. Then gadolinium-containing contrast agent was administered immediately with a tube voltage of 110 kV. Radiation exposure and image quality were compared. On average, a dose reduction factor of 3.57 times was achieved by using 110 instead of 75 kV. However, the image quality was poorer in the majority of cases as compared with the images taken with iodine as a contrast agent and a tube voltage of 75 kV. The poorer image quality is caused by the relative low concentration (0.5) m of the used gadolinium solution. A 1 m solution is currently tested for market approval and would probably solve this problem.
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Correspondence to: F. Fobbe
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Fobbe, F., Wacker, F. & Wagner, S. Arterial angiography in high-kilovoltage technique with gadolinium as the contrast agent: first clinical experience. Eur. Radiol. 6, 224–229 (1996). https://doi.org/10.1007/BF00181155
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DOI: https://doi.org/10.1007/BF00181155