Characterization of attenuation and respiratory motion artifacts and their influence on SPECT MP image evaluation using a dynamic phantom assembly with variable cardiac defects.
J Nucl Cardiol
; 24(2): 698-707, 2017 04.
Article
em En
| MEDLINE
| ID: mdl-26846369
ABSTRACT
BACKGROUND:
A phantom assembly that simulates the respiratory motion of the heart was used to investigate artifacts and their impact on defect detection.METHODS:
SPECT/CT images were acquired for phantoms with and without small and large cardiac defects during normal and deep breathing, and also at four static respiratory phases. Acquisitions were reconstructed with and without AC, and with misalignment of transmission and emission scans. A quantitative analysis was performed to assess artifacts. Two physicians reported on defect presence or absence and their results were evaluated.RESULTS:
All large defects were correctly reported. Attenuation reduced uptake in the basal LV walls, increasing FN physicians' reports for small defects. Respiratory motion reduced uptake mainly in the anterior and inferior walls increasing FP and FN reports on images without and with small defects, respectively. Artifacts due to misalignment between CT and SPECT scans in normal breathing phantoms did not influence the physicians' reports.CONCLUSIONS:
Attenuation and respiratory motion correction should be applied to reduce artifacts before reporting on small defects in deep breathing conditions. Artifacts due to misalignment between CT and SPECT scans do not affect defect detection in normal breathing when the LV is co-registered in SPECT and CT images prior to AC.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mecânica Respiratória
/
Tomografia Computadorizada de Emissão de Fóton Único
/
Artefatos
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Imagens de Fantasmas
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Imagem de Perfusão do Miocárdio
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Cardiopatias
Tipo de estudo:
Diagnostic_studies
/
Evaluation_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article