Noise reduction and image quality in ultra-high resolution computed tomography of the temporal bone using advanced modeled iterative reconstruction.

Noise reduction and image quality in ultra-high resolution computed tomography of the temporal bone using advanced modeled iterative reconstruction. Acta Radiol. 2019 Jan 08;:284185118820699 Authors: Hempel JM, Niklas Bongers M, Braun K, Ernemann U, Bier G Abstract BACKGROUND: The novel advanced modeled iterative reconstruction (ADMIRE) algorithm in ultra-high-resolution (UHR) computed tomography (CT) of the temporal bone has not yet been systematically evaluated. PURPOSE: To assess the potential of ADMIRE in temporal bone UHR CT. MATERIAL AND METHODS: Forty-four patients who underwent UHR CT of the temporal bone using z-axis UHR protocol were retrospectively selected for analysis. Images were reconstructed using filtered back projection (FBP) and ADMIRE with multiple strength levels. Regions of interest were drawn in the posterior fossa and petrous bone. The average density (in Hounsfield units [HU]) and the image noise (standard deviation of density values) were extracted. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were then calculated. Additionally, a subjective qualitative analysis was performed using a five-point Likert scale. The potential dose reduction was extrapolated from objective analysis and confirmed in an additional phantom study. RESULTS: The image noise was significantly lower, and the SNR and CNR were significantly higher in ADMIRE reconstructions levels A2-A5 than in FBP ( P 
Source: Acta Radiologica - Category: Radiology Authors: Tags: Acta Radiol Source Type: research

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