2024-03-28T19:01:43Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00015360
2022-04-27T09:57:39Z
2780:535
2780:537
3:62:5595:428
Hepatic pseudo-anisotropy: a specific artifact in hepatic diffusion-weighted images obtained with respiratory triggering
那須, 克宏
南, 学
Nasu, Katsuhiro
Kuroki, Yoshifumi
Fujii, Hirofumi
Minami, Manabu
application/pdf
Purpose: 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.
Methods: 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.
Results: 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).
Conclusion: 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.
journal article
Springer Berlin
2007-10
application/pdf
Magnetic resonance materials in physics, biology and medicine
4
20
205
211
http://hdl.handle.net/2241/98270
0968-5243
AA10962689
https://tsukuba.repo.nii.ac.jp/record/15360/files/Magma_20-4.pdf
eng
17960439
10.1007/s10334-007-0084-0
© ESMRMB 2007