Evaluation of a metal artifact reduction algorithm applied to post-interventional flat detector CT in comparison to pre-treatment CT in patients with acute subarachnoid haemorrhage.
Eur Radiol
; 27(1): 88-96, 2017 Jan.
Article
em En
| MEDLINE
| ID: mdl-27085699
ABSTRACT
OBJECTIVES:
Metal artefacts can impair accurate diagnosis of haemorrhage using flat detector CT (FD-CT), especially after aneurysm coiling. Within this work we evaluate a prototype metal artefact reduction algorithm by comparison of the artefact-reduced and the non-artefact-reduced FD-CT images to pre-treatment FD-CT and multi-slice CT images.METHODS:
Twenty-five patients with acute aneurysmal subarachnoid haemorrhage (SAH) were selected retrospectively. FD-CT and multi-slice CT before endovascular treatment as well as FD-CT data sets after treatment were available for all patients. The algorithm was applied to post-treatment FD-CT. The effect of the algorithm was evaluated utilizing the pre-post concordance of a modified Fisher score, a subjective image quality assessment, the range of the Hounsfield units within three ROIs, and the pre-post slice-wise Pearson correlation.RESULTS:
The pre-post concordance of the modified Fisher score, the subjective image quality, and the pre-post correlation of the ranges of the Hounsfield units were significantly higher for artefact-reduced than for non-artefact-reduced images. Within the metal-affected slices, the pre-post slice-wise Pearson correlation coefficient was higher for artefact-reduced than for non-artefact-reduced images.CONCLUSION:
The overall diagnostic quality of the artefact-reduced images was improved and reached the level of the pre-interventional FD-CT images. The metal-unaffected parts of the image were not modified. KEY POINTS ⢠After coiling subarachnoid haemorrhage, metal artefacts seriously reduce FD-CT image quality. ⢠This new metal artefact reduction algorithm is feasible for flat-detector CT. ⢠After coiling, MAR is necessary for diagnostic quality of affected slices. ⢠Slice-wise Pearson correlation is introduced to evaluate improvement of MAR in future studies. ⢠Metal-unaffected parts of image are not modified by this MAR algorithm.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Hemorragia Subaracnóidea
/
Algoritmos
/
Tomografia Computadorizada por Raios X
/
Artefatos
Tipo de estudo:
Observational_studies
/
Prognostic_studies
Limite:
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article