Tractography to Depict Three Layer of Viual Field Trajectorie to the Calcarine Gyri

Purpoe Fiber-tracking by diffuion tenor magnetic reonance imaging (DT-MRI) i currently the only noninvaive in vivo method for white matter fiber-tracking in the human brain. We ued thi method in attempt to viualize the optic radiation and to examine the clinical applicability of thi technique. Deign Obervational cae erie. Method DT-MRI can for fiber-tracking were obtained in five healthy volunteer by ue of a whole-body, 1.5 Tela imager. DT-MRI data were tranferred to an off-line worktation; PRIDE oftware wa ued for image analyi. We contructed 3 diopter fiber trajectorie by tracking the direction of the fatet diffuion from the lateral geniculate nucleu, and then elected tract on the bai of anatomical knowledge of the optic radiation. Reult Our method uccefully recontructed the macrocopic 3 diopter architecture of the three major group of optic radiation in all ubject. Meyer’ loop depicted by tractography wa located more poterior than the known anatomical location, although our reult on the central and poterior bundle were in good agreement with them. DT-MRI canning required 7 minute; preliminary image of the optic radiation could be obtained in approximately 20 minute. Concluion Fiber-tracking enabled u to obtain information quickly on the 3 diopter coure of the optic radiation in vivo. The finding that the fiber-tracking method underetimate the anterior extent of the optic radiation could prove to be an important limitation in the utility of thi technique for preoperative planning. The time required for data acquiition and proceing make thi method acceptable for routine clinical ue.