iQMetrix-CT: New software for task-based image quality assessment of phantom CT images

The purpose of this article was to explain how the new iQMetrix-CT software works, as well as to describe its current potential and discuss its future applications. iQMetrix-CT was developed by a working group from the French Society of Medical Physicists (SFPM). This software calculates three advanced metrics, which have been adapted to take into account the non-linear and non-stationary properties of iterative reconstruction algorithms. Noise power spectrum is calculated to assess noise texture and noise magnitude in the frequency domain. The task-based transfer function is computed to assess the spatial resolution under conditions of contrast and noise similar to the lesions encountered in clinical practice. Finally, the detectability index is used to estimate the radiologist's ability to perform a given task such as detecting a simulated lesion. These metrics are very useful to evaluate the performance of reconstruction algorithms in term of image quality and optimize the doses of a given protocol or to evaluate and compare a new technology.(c) 2022 Published by Elsevier Masson SAS on behalf of Societe francaise de radiologie.

Automated summary

This article explains the working principle, current potential, and future applications of iQMetrix-CT software. It also discusses the calculation of three advanced metrics and their significance in evaluating reconstruction algorithms and optimizing image quality.