All MRI examinations were performed via the fast-field echo method with T1-weighted images using a 1.5T magnetic resonance system (Achieva 1.5T Nova Dual; Philips Healthcare, Best, the Netherlands) and a 47-mm microscopy coil. The pulse sequence parameters were as follows: repetition time, 9.9 ms; echo time, 4.4 ms; imaging angle, 25°; imaging matrix, 224×192; reconstruction matrix, 288×288; acquisition slice thickness, 1 mm; reconstruction slice thickness, 0.5 mm; field of view, 80×80 mm; and number of excitations, 2.
After mydriasis of the eye had been achieved using tropicamide phenylene hydrochloride, the examination was conducted with the participant in supine position. To suppress ocular movement, a 45° mirror was fixed 15 cm in front of the eye, vertically above the participant; the participant was instructed to stare at the fixation point. In addition, the participant was instructed to avoid blinking during imaging. After confirmation by both the ophthalmologist and radiology technician that the participant’s blinking was suppressed and their eye was focused on the fixation point, a sequence of images was obtained. If this confirmation was not possible, the position of the mirror was changed, and imaging was repeated.
After mydriasis of the eye had been achieved using tropicamide phenylene hydrochloride, the examination was conducted with the participant in supine position. To suppress ocular movement, a 45° mirror was fixed 15 cm in front of the eye, vertically above the participant; the participant was instructed to stare at the fixation point. In addition, the participant was instructed to avoid blinking during imaging. After confirmation by both the ophthalmologist and radiology technician that the participant’s blinking was suppressed and their eye was focused on the fixation point, a sequence of images was obtained. If this confirmation was not possible, the position of the mirror was changed, and imaging was repeated.