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Hepatic pseudo-anisotropy: a specific artifact in hepatic diffusion-weighted images obtained with respiratory triggering

Nasu, Katsuhiro ; Kuroki, Yoshifumi ; Fujii, Hirofumi ; Minami, Manabu

Magma (New York, N.Y.), 2007-10, Vol.20 (4), p.205-211 [Periódico revisado por pares]

Germany: Springer Nature B.V

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  • Título:
    Hepatic pseudo-anisotropy: a specific artifact in hepatic diffusion-weighted images obtained with respiratory triggering
  • Autor: Nasu, Katsuhiro ; Kuroki, Yoshifumi ; Fujii, Hirofumi ; Minami, Manabu
  • Assuntos: Abdomen - pathology ; Aged ; Anisotropy ; Cholangiocarcinoma - pathology ; Correlation analysis ; Humans ; Image Processing, Computer-Assisted ; Liver ; Liver - anatomy & histology ; Liver - pathology ; Liver Neoplasms - pathology ; Male ; Medical imaging ; Medical research ; Respiratory Mechanics - physiology ; Respiratory system
  • É parte de: Magma (New York, N.Y.), 2007-10, Vol.20 (4), p.205-211
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Hepatic pseudo-anisotropy is an artifact observed in hepatic diffusion-weighted imaging under respiratory triggering (RT-DWI). To determine the clinical significance of this phenomenon, hepatic RT-DW images were reviewed. One hundred and five MR examinations, including RT-DWI, were assessed. The patient group included 62 non-cirrhotic and 43 cirrhotic individuals. All images were evaluated by mutual agreement of two radiologists from the viewpoints of incidence of pseudo-anisotropy and correlation between pseudo-anisotropy and the quality of trace images. The ADC of normal hepatic parenchyma of non-cirrhotic livers were measured in both areas with and without pseudo-anisotropy. Pseudo-anisotropy was observed in 60% of non-cirrhotic (37/62) and 30% of cirrhotic (13/43) images. The difference between the two groups was statistically significant (P < 0.001). The quality of trace images showed a tendency to worsen as pseudo-anisotropy became significant. However, the quality of trace images was generally satisfactory, with only two patients whose trace images were difficult to interpret due to pseudo-anisotropy. The areas with pseudo-anisotropy showed higher ADC than those without pseudo-anisotropy (P < 0.001). Pseudo-anisotropy is a type of artifact that originates from respiratory movement. Even though respiratory triggering is employed, ADC measurement of the liver is inaccurate because of pseudo-anisotropy, especially in non-cirrhotic patients.
  • Editor: Germany: Springer Nature B.V
  • Idioma: Inglês
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