Errors in measuring blood flow velocity behind hepatic mass lesions using color doppler sonography.
The authors designed microcomputer simulation models to investigate the combined effect of a distorted grayscale ultrasound image and an inaccurately measured Doppler angle on the accuracy of measurement of blood-flow velocity in vessels located behind mass lesions in the liver. Error decreased when flow was measured at the midpoint of the posttumoral segment of the vessel and increased with distance between the mass and the vessel, with inclination of the vessel, and with decrease in the diameter of the mass. Error was least with the sector probe, intermediate with the convex probe, and greatest with the linear probe. These findings suggest that the error can be minimized when measuring blood flow velocity in a vessel located behind a mass, if the Doppler images are acquired using a sector probe from the midpoint of the posttumoral segment of the vessel.
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.|Department of Gastroenterology Akita Medical Center, 6-17, Senshu-Kubota-machi, Akita, Japan.
Atsushi
A
Uno
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.|Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan.
Hideaki
H
Ishida
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Kei
K
Konno
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Yuki
Y
Hamashima
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Hiroko
H
Naganuma
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.|Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan.
Tomoya
T
Komatsuda
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Michiko
M
Sato
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Kenichi
K
Shindoh
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.|Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan.
Jinko
J
Oyake
First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.
Sumio
S
Watanabe
Doppler; artifact; computer; liver tumor; vessel