Blood oxygen level-dependent (BOLD) sensitive whole-brain fMRI scanning was performed on a 3.0 T GE Signal System (General Electric; Milwaukee, WI) using a four-channel GE Quadrature sending and receiving head coil using a T2*-sensitive gradient echo reserve spiral acquisition sequence optimized to minimize susceptibility to artifact (signal loss) at the medial temporal lobe [23 (link)]. All veterans and eight healthy control functional images were acquired from a sequence with the following parameters: 43 axial, 3-mm-thick slices; 2 s repetition time; 30 ms echo time; 64 × 64 matrix; 220 mm field of view; flip angle 90°. The remaining five healthy control functional images were acquired with a sequence with the following parameters: 30 axial, 5-mm-thick slices; 2 s repetition time; 25 ms echo time; 64 × 64 matrix; 240 mm field of view; flip angle 77°. Subsequent analysis revealed that removing the 5HCs scanned using different parameters did not alter the reported findings below. Additionally, a high-resolution, T1-weighted volumetric anatomical scan (three-dimensional spoiled gradient echo) was acquired in the same plane for anatomical localization and spatial normalization. All subjects participated in an 8-min scan and were instructed to focus on a white fixation cross.
Quadrature sending and receiving head coil
Manufactured by GE Healthcare
The Quadrature sending and receiving head coil is a specialized piece of laboratory equipment used in MRI (Magnetic Resonance Imaging) systems. It is designed to transmit and receive radio frequency (RF) signals to and from the patient's head during an MRI scan. The coil's quadrature design allows for improved signal-to-noise ratio and image quality compared to traditional coils.
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Lab products found in correlation
2 protocols using quadrature sending and receiving head coil
1
BOLD fMRI Scanning Protocol for Brain Imaging
2
Resting-State fMRI Acquisition Protocol
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Functional imaging was performed with blood-oxygen-level-dependent (BOLD) sensitive whole-brain fMRI on a 3.0 Tesla GE Signa System (General Electric; Milwaukee, WI) using a four-channel GE Quadrature sending and receiving head coil. Images were acquired with 30 axial, 5-mm-thick slices using a standard T2*-sensitive gradient echo reverse spiral acquisition sequence (2 s repetition time; 25 ms echo time; 64 × 64 matrix; 24 cm field of view; flip angle 77°; 3.75 × 3.75 × 5 mm final voxel size). A high-resolution, T1-weighted volumetric anatomical scan was also acquired in the axial plane (9 ms repetition time, 1.8 ms echo time; 256 × 256 matrix; 256 mm field of view; flip angle 15°; 124 slices; 1.2 mm slice thickness) at the same position as the functional images for anatomical localization and spatial normalization. Resting-state functional imaging included one 8-min scan during which participants were instructed to look at a fixation cross and let their mind wander without falling asleep.
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