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Dual-layer spectral CT improves the image quality of cerebral unenhanced CT scan in children

Zhengwu Tan1, Lan Zhang1, Xiaojie Sun1

  • 1Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, Hubei, China.

European Journal of Radiology
|May 14, 2023
PubMed

Insights

Virtual monoenergetic imaging (VMI) enhances pediatric brain scan quality compared to conventional imaging. Optimal VMI energies are 50 keV for brain parenchyma and 100 keV for posterior fossa and subcalvarial spaces.

Area of Science:

  • Medical Imaging
  • Radiology
  • Pediatric Imaging

Background:

  • Dual-layer spectral detector computed tomography (DLCT) offers advanced imaging capabilities.
  • Virtual monoenergetic imaging (VMI) allows for post-acquisition image optimization.
  • Assessing image quality in pediatric neuroimaging is crucial for diagnosis.

Purpose of the Study:

  • To evaluate image quality of VMI in unenhanced pediatric cerebral scans.
  • To determine optimal VMI energy levels for pediatric brain imaging using DLCT.

Main Methods:

  • Retrospective analysis of 53 unenhanced pediatric cerebral scans (age ≤ 12 years) acquired with DLCT.
  • Reconstruction of conventional images (CI) and VMIs at various kiloelectronvolt (keV) levels.
  • Quantitative analysis of noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and artifact indices (PFAI, SAI); qualitative assessment of image quality by two radiologists.

Main Results:

  • VMI showed lower noise at 100 keV compared to CI.
  • Significantly higher SNR and CNR were observed with VMI between 45-75 keV.
  • Optimal gray matter-white matter differentiation (GWMA) and overall diagnostic quality were achieved at 50 keV.
  • Best subcalvarial space (SAA) and posterior fossa artifact (PFAA) scores were obtained at 100 keV.

Conclusions:

  • VMI significantly improves image quality in pediatric cerebral scans compared to CI.
  • The optimal VMI energy level for brain parenchyma is 50 keV.
  • The optimal VMI energy level for subcalvarial space and posterior fossa is 100 keV.
Abstract

Keywords:
Dual-layer detector computed tomographyImage quality and contrastPediatric brainVirtual monoenergetic imaging

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