Dual-energy computed tomography for evaluation of breast cancer: value of virtual monoenergetic images reconstructed with a noise-reduced monoenergetic reconstruction algorithm

Jpn J Radiol. 2020 Feb;38(2):154-164. doi: 10.1007/s11604-019-00897-1. Epub 2019 Nov 4.

Abstract

Purpose: To evaluate the image quality and lesion visibility of virtual monoenergetic images (VMIs) reconstructed using a new monoenergetic reconstruction algorithm (nMERA) for evaluation of breast cancer.

Materials and methods: Forty-two patients with 46 breast cancers who underwent 4-phasic breast contrast-enhanced computed tomography (CT) using dual-energy CT (DECT) were enrolled. We selected the peak enhancement phase of the lesion in each patient. The selected phase images were generated by 120-kVp-equivalent linear blended (M120) and monoenergetic reconstructions from 40 to 80 keV using the standard reconstruction algorithm (sMERA: 40, 50, 60, 70, 80) and nMERA (40 +, 50 +, 60 +, 70 +, 80 +). The contrast-to-noise ratio (CNR) was calculated and objectively analyzed. Two independent readers subjectively scored tumor visibility and image quality each on a 5-point scale.

Results: The CNR at 40 + and tumor visibility scores at 40 + and 50 + were significantly higher than those on M120. The CNR at 50 + was not significantly different from that on M120. However, the overall image quality score at 40 + was significantly lower than that at 50 + and on M120 (40 + vs M120, P < 0.0001 and 40 + vs 50 +, P = 0.0001).

Conclusions: VMI reconstructed with nMERA at 50 keV is preferable for evaluation of patients with breast cancer.

Keywords: Breast cancer; Dual-energy computed tomography; Noise-reduced monoenergetic reconstruction algorithm; Virtual monoenergetic images.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Algorithms
  • Breast / diagnostic imaging
  • Breast Neoplasms / diagnostic imaging*
  • Female
  • Humans
  • Middle Aged
  • Radiographic Image Interpretation, Computer-Assisted / methods*
  • Radiography, Dual-Energy Scanned Projection / methods*
  • Retrospective Studies
  • Signal-To-Noise Ratio
  • Tomography, X-Ray Computed / methods*