Another essential part of Kellan's armoury is an echo-scanner, which picks out enemies within range, plus traps, alarms, ammo stashes and adrenalin packs: the OWL can revive you, but only if you have adrenalin, and you can only carry a maximum of two packs, so it's by no means a free pass.
In past experiments the Mirror Detector Approach was implemented to determine such measurements with a multi-echo laser scanner.
Instead, the backpack features multi-echo laser scanners (judging from Google's images, the backpack features two of these $4,500 units) and an inertial measurement unit.
Within-scanner measurements are remarkably reliable across scan sessions, being minimally affected by averaging of multiple acquisitions, B1 correction, acquisition sequence (MPRAGE vs. multi-echo-FLASH), major scanner upgrades (Sonata Avanto, Trio TrioTIM), and segmentation atlas (MPRAGE or multi-echo-FLASH).
The fMRI data for both healthy and dyslexic subjects are collected using a 1.5-T General Electric echo-speed Horizon LX scanner with a birdcage head coil (GE Medical Systems, Milwaukee, WI) by Radiology Department of Wake Forest University.
Anatomical MRI images were acquired on 1.5 Tesla scanners using an MPRAGE (Magnetization Prepared Rapid Gradient Echo) sequence (on Siemens scanners) or its equivalent on a GE scanner.
Using a 3.0 Tesla scanner, dual-echo and DT MRI scans were acquired from 15 pediatric migraine patients and 15 age-matched controls.
The scanner acquired echo-planar-imaging (EPI) sequences using fast gradients.
Sensitivity encoding (SENSE) was applied in the RL direction with an acceleration factor of 3. The images were reconstructed to 0.3-mm isotropic voxels, and the built-in phase correction and partial-echo filter of the scanner were applied during reconstruction.
Data were collected using a Siemens Trio 3T scanner using gradient-echo T2*-weighted echo-planar images (EPI) to measure blood-oxygen-level-dependent (BOLD) contrasts.
The rest brain sequence ((hbox {TR/TE}=2,500/24.3,text{ms},, 90^{circ }) flip angle, 3 mm slick thickness, 22 cm FOV, 64 × 64 matrix, 90 volumes) was acquired by a 3T whole-body scanner and a gradient-echo echo-planar imaging (EPI) acquisition sequence.
