title: [Distortion in diffusion weighted imaging].
abstract: The definitional equation of the distortion of echo planar imaging(EPI)was examined. We compared measured values with calculated values by using the definitional equation of the chemical shift of the EPI method that first composed the diffusion-weighted image, and examined the possibility of applying it to the distortion. The results showed that the chemical shift with the definitional equation and the measurement corresponded, and the correlation between the chemical shift and the distortion was acquired. Next, the distortion of each images that composed DWI with the increase and the sign acceptable method difference of b value. The difference in the distortion between each image has increased with the increase in b value. It was assumed that the influence of the eddy currents was due to the high motion probing gradient.
authors.affiliation: Department of Radiology, Federation of National Public Service and Affiliated Personnel Mutual Aid Associations, Yokohama Sakae Kyousai Hospital.
authors.forename: Mitsuyuki
authors.initials: M
authors.lastname: Takahashi
authors.forename: Akio
authors.initials: A
authors.lastname: Ogura
authors.forename: Masanori
authors.initials: M
authors.lastname: Ozaki
authors.forename: Isao
authors.initials: I
authors.lastname: Muro
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Doi
authors.forename: Tosiaki
authors.initials: T
authors.lastname: Miyati
authors.forename: Hajime
authors.initials: H
authors.lastname: Tanji
authors.forename: Junji
authors.initials: J
authors.lastname: Takahashi
authors.forename: Osamu
authors.initials: O
authors.lastname: Takizawa
mesh_terms: D038524:Diffusion Magnetic Resonance Imaging; D017352:Echo-Planar Imaging