Wide-detector axial CT versus 4 cm detector helical CT for transcatheter aortic valve replacement: iodine dose, radiation, and image quality

Clin Imaging. 2016 Nov-Dec;40(6):1213-1218. doi: 10.1016/j.clinimag.2016.08.002. Epub 2016 Aug 4.

Abstract

Purpose: This study aims to compare transcatheter aortic valve replacement (TAVR) planning on 16 cm wide-detector computed tomography (CT) to TAVR planning on 4 cm detector CT.

Materials and methods: A total of 36 patients who had TAVR planning axial CT on a wide-detector scanner (protocol 1) were compared to 36 patients who had helical 4 cm detector CT (protocol 2).

Results: Vascular attenuation was greater for protocol 1, but image noise, contrast-to-noise ratio, and signal-to-noise ratio were the same. Radiation dose was lower and iodine dose was less for protocol 1.

Conclusion: Protocol 1 had greater vascular attenuation and similar image quality but lower radiation and less iodine compared to protocol 2.

Keywords: Axial step-and-shoot CT; Computed tomography; Iodine dose; TAVR planning CT; Wide-detector CT.

MeSH terms

  • Aged
  • Contrast Media / administration & dosage*
  • Female
  • Humans
  • Image Enhancement*
  • Iodine / administration & dosage*
  • Male
  • Radiation Dosage*
  • Retrospective Studies
  • Signal-To-Noise Ratio
  • Tomography, Spiral Computed / methods*
  • Tomography, X-Ray Computed / methods*
  • Transcatheter Aortic Valve Replacement*

Substances

  • Contrast Media
  • Iodine