Evaluation of projection- and dual-energy-based methods for metal artifact reduction in CT using a phantom study

Journal of Applied Clinical Medical Physics
Zaiyang LongLifeng Yu

Abstract

Both projection and dual-energy (DE)-based methods have been used for metal artifact reduction (MAR) in CT. The two methods can also be combined. The purpose of this work was to evaluate these three MAR methods using phantom experiments for five types of metal implants. Five phantoms representing spine, dental, hip, shoulder, and knee were constructed with metal implants. These phantoms were scanned using both single-energy (SE) and DE protocols with matched radiation output. The SE data were processed using a projection-based MAR (iMAR, Siemens) algorithm, while the DE data were processed to generate virtual monochromatic images at high keV (Mono+, Siemens). In addition, the DE images after iMAR were used to generate Mono+ images (DE iMAR Mono+). Artifacts were quantitatively evaluated using CT numbers at different regions of interest. Iodine contrast-to-noise ratio (CNR) was evaluated in the spine phantom. Three musculoskeletal radiologists and two neuro-radiologists independently ranked the artifact reduction. The DE Mono+ at high keV resulted in reduced artifacts but also lower iodine CNR. The iMAR method alone caused missing tissue artifacts in dental phantom. DE iMAR Mono+ caused wrong CT numbers in close proximity to the...Continue Reading

References

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Citations

May 1, 2019·AJR. American Journal of Roentgenology·Prabhakar RajiahNaveen Subhas
Mar 11, 2020·Acta Radiologica·Mara MuellensiefenHolger Krakowski-Roosen
Jan 23, 2019·AJR. American Journal of Roentgenology·Zaiyang LongLifeng Yu
May 5, 2020·Technology and Health Care : Official Journal of the European Society for Engineering and Medicine·Ryan ChouCheng-Hsun Lin
Jan 5, 2021·Journal of Applied Clinical Medical Physics·Zaiyang LongJoel P Felmlee

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Methods Mentioned

BETA
total hip arthroplasty

Software Mentioned

iMAR Mono +
DE iMAR Mono
DE iMAR Mono +
DE
SAFIRE
SE
DE Mono +
Mono
DE Mono + Mono
FSMAR

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