Keywords:
Quality assurance, Dosimetric comparison, Physics, Dosimetry, Acceptance testing, Image manipulation / Reconstruction, CT, Radioprotection / Radiation dose, Radiation physics
Authors:
G. Venturi , S. Farnedi, N. Scrittori, V. Ravaglia; Ravenna/IT
DOI:
10.26044/ecr2019/C-1370
Aims and objectives
Computed tomography (CT) is the most important source of medical radiation exposure and thus dose reduction has become a crucial topic.
In the last years strategies to optimize CT procedures have been developed: a successful approach is obtained by the introduction and the improvement of iterative reconstruction algorithms (IR).
This iterative reconstruction methods,
in opposition to filtered back projection,
incorporate physical models and allow to perform CT studies at lowed doses.
In this work we aimed to evaluate the imaging properties of Asir-V iterative reconstruction (IR) algorithm in terms of noise level and contrast to noise ratio (CNR) during acceptance testing of a new CT Scanner.
A phantom dedicated to CT quality assurance has been used to test changes in noise and contrast to noise ratio between filtered back projection and iterative methods.