Takayuki Masui MD, Presenter: Nothing to Disclose

Motoyuki Katayama MD, Abstract Co-Author: Nothing to Disclose

Shuhei Yamashita MD, Abstract Co-Author: Nothing to Disclose

Nobuko Yoshizawa, Abstract Co-Author: Nothing to Disclose

Kimihiko Sato, Abstract Co-Author: Nothing to Disclose

Hidekazu Seo, Abstract Co-Author: Nothing to Disclose

Harumi Sakahara MD, Abstract Co-Author: Nothing to Disclose

Motoyuki Ikeda, Abstract Co-Author: Nothing to Disclose

Atsushi Nozaki, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

To evaluate and compare the abilities of FSE and FIESTA images for the detection of dysfunction of ocular movement using a kinematic display.

46 subjects(normal 15;dysfunction of horizontal ocular movement 15;vertical 16) were studied for evaluation of ocular movement with a 1.5T magnet using a 5-inch surface coil. Either axial or oblique-sagittal images using FSE and FIESTA were repeatedly obtained while the subjects sequentially gazed at each mark of 11 steps along horizontal or vertical direction. Imaging time for one phase was 12 seconds for FSE and 1 second for FIESTA with comparable in-plane resolution. Contrast ratio(CR)=[SNR(fat)-SNR(extraocular muscle or optic nerve)]/SNR(fat) was obtained. Image quality, susceptibility artifact, existence of the adhesions were evaluated with kinematic and static images using a 100 point-scale(1 for worst or adhesion;100 for best or no-adhesion). For evaluation of dysfunction of ocular movement, the point of lower than 50, and higher than or equal to 50 was regarded as for the existence and absence of dysfunction, respectively.

CR of the extracoular muscle or optic nerve was higher on FIESTA(0.7-0.9) than on FSE images(0.6-0.8)(p<0.05). Susceptibility artifacts were more prominent on FIESTA(84.5;72.6)(horizontal;vertical) than on FSE(90.0;92.2)(p<0.05). In evaluation of horizontal ocular movement, motion artifacts were less on FIESTA(93.5) than on FSE(82.3), and overall image quality was better on FIESTA(90.3) than on FSE(85.1). In evaluation of vertical ocular movement, there was no significant difference in motion artifact between two types of images(90.9;89.0). Overall quality was better on FSE(90.6) than on FIESTA(85.7). Sensitivities for detection of ocular dysfunction were 0.64, 0.78(kinematic axial FSE;FIESTA);0.88,0.94(kinematic obl-sagi FSE;FIESTA);0.18,0.22(static axial FSE, FIESTA);0.69,0.75(static obl-sag FSE, FIESTA), respectively. Specificities were 1.00 for all imaging except static obl-sagi FIESTA(0.93).

FIESTA images provide useful kinematic information of ocular movement in a very short time. When susceptibility artifact is problematic, FSE imaging may be an alternate especially in oblique-sagittal plane.

Masui, T, Katayama, M, Yamashita, S, Yoshizawa, N, Sato, K, Seo, H, Sakahara, H, Ikeda, M, Nozaki, A, et al, , Functional Assessment of the Ocular Movement: Comparison of FSE and FIESTA.  Radiological Society of North America 2004 Scientific Assembly and Annual Meeting, November 28 - December 3, 2004 ,Chicago IL. http://archive.rsna.org/2004/4405876.html