What are the advantages of reduced tube voltage for coronary computed tomography angiography (CCTA)?

Updated: Dec 21, 2017
  • Author: Eugene C Lin, MD; Chief Editor: Eugene C Lin, MD  more...
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Answer

Answer

Reducing the tube voltage (from 120 kV to 100 or 80 kV) will reduce the radiation dose. Another advantage is that opacification of the blood vessels may increase at lower kV because of an increase in the photoelectric effect. [3] The primary disadvantage is increased image noise. SCCT guidelines [53] recommend a tube potential of 100 kV for patients weighing no more than 90 kg or with a body mass index of no more than 30 kg/m2. A tube potential of 120 kV is indicated for larger patients, and even higher tube potentials may be indicated for severely obese patients.


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