Metal artifact reduction (MAR) based on two-compartment physical modeling: evaluation in patients with hip implants.
In: Acta Radiologica, Jg. 58 (2017), Heft 1, S. 70-76
Online
academicJournal
Zugriff:
Background: Artifacts from metallic implants can hinder image interpretation in computed tomography (CT). Image quality can be improved using metal artifact reduction (MAR) techniques. Purpose: To evaluate the impact of a MAR algorithm on image quality of CT examinations in comparison to filtered back projection (FBP) in patients with hip prostheses. Material and Methods: Twenty-two patients with 25 hip prostheses who underwent clinical abdominopelvic CT on a 64-row CT were included in this retrospective study. Axial images were reconstructed with FBP and five increasing MAR levels (M30-34). Objective artifact strength (OAS) (SIart-SInorm) was assessed by region of interest (ROI) measurements in position of the strongest artifact (SIart) and in an osseous structure without artifact (SInorm) (in Hounsfield units [HU]). Two independent readers evaluated subjective image quality regarding metallic hardware, delineation of bone, adjacent muscle, and pelvic organs on a 5-point scale (1, non-diagnostic; 5, excellent image quality). Artifacts in the near field, far field, and newly induced artifacts due to the MAR technique were analyzed. Results: OAS values were: M34: 243.8 ± 155.4 HU; M33: 294.3 ± 197.8 HU; M32: 340.5 ± 210.1 HU; M31: 393.6 ± 225.2 HU; M30: 446.8 ± 224.2 HU and FBP: 528.9 ± 227.7 HU. OAS values were significantly lower for M32-34 compared to FBP (P < 0.01). For overall subjective image quality, results were: FBP, 2.0 ± 0.2; M30, 2.3 ± 0.8; M31, 2.6 ± 0.5; M32, 3.0 ± 0.6; M33, 3.5 ± 0.6; and M34, 3.8 ± 0.4 (P < 0.001 for M30-M34 vs. FBP, respectively). Increasing MAR levels resulted in new artifacts in 17% of reconstructions. Conclusion: The investigated MAR algorithm led to a significant reduction of artifacts from metallic hip implants. The highest MAR level provided the least severe artifacts and the best overall image quality. [ABSTRACT FROM AUTHOR]
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Metal artifact reduction (MAR) based on two-compartment physical modeling: evaluation in patients with hip implants.
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Autor/in / Beteiligte Person: | Boos, Johannes ; Sawicki, Lino Morris ; Lanzman, Rotem Shlomo ; Thomas, Christoph ; Aissa, Joel ; Schleich, Christoph ; Heusch, Philipp ; Antoch, Gerald ; Kröpil, Patric |
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Zeitschrift: | Acta Radiologica, Jg. 58 (2017), Heft 1, S. 70-76 |
Veröffentlichung: | 2017 |
Medientyp: | academicJournal |
ISSN: | 0284-1851 (print) |
DOI: | 10.1177/0284185116633911 |
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