This all-reflective active zoom system can realize zoom ratio is 3, focal length between 5 and 15 mm, field-of-view of 10 27.8°, and wide working wavelength from the visible to infrared.
Reconstructed images consisted of 21 slices covering the whole brain, with slice thickness 4 mm, interslice distance 1 mm, field-of-view 25 cm and in-plane resolution 128*128.
This procedure was performed by an experienced neuroradiologist using an axial T2 fluid attenuation inversion recovery (FLAIR) sequence [35 slices, echo time = 125 ms, repetition time = 11 000 ms, acquired voxel-size 0.65/0.99/3.5 mm (interpolated to 0.45/0.45/3.5 mm), field-of-view = 230 × 119 mm, slice thickness of 3.5 mm].
In SE sequences, for example, 3-mm slice thickness, 210-mm field-of-view and 208 × 512 matrix size result in a voxel size of 0.8 × 0.4 × 3 mm.
Images were obtained with a matrix size of 256 × 256 two measurements were acquired: section thickness of 2 mm; field of view of 10 × 10 cm.
Five minute acquisitions were repeated over several runs using the dedicated brain 256 mm field of view (FOV) and the whole body 576 mm FOV.
The experimental results show that the X-ray backlight imaging system provides an approximate 75 μm spatial resolution at a 9 mm×20 mm field of view.
The scan field of view was 240 mm, field of view phase was 100%, repetition time was 6600 ms, echo time was 93 ms, and slice thickness was 1.00 mm.
The CT scanner used was a Philips Brilliance 16-slice scanner, and the imaging specifications used for all patients included 1.5 mm slice thickness, 0.75 mm slice increment, 120 kV, 250 mAs, 500 mm field of view, 512 × 512 resolution.
The in-plane voxel size was 3 × 3 mm (216 × 216 mm field of view acquired with a 72×7272 pixel data matrix, reconstructed with zero filling to 128 × 128 pixels).
The final coil is capable of the collection of single shot EPI images with 6 mm field of view and 94 μm isotropic voxels at imaging rates exceeding 50 s−1.
