MR images were acquired on a 3 T Trio scanner with an eight-channel head array coil (Siemens, Erlangen, Germany). Blood oxygen level dependent (BOLD) fMRI using a T2*-weighted gradient echo spiral echo-planar (EPI) sequence with a repetition time of 2.5 s, echo time of 26 ms, flip angle of 76°, and 41 slices with a slice thickness of 3 mm and 25% gap between slices. The EPI sequence was optimized for signal recovery in orbitofrontal cortex by tilting slice orientation from a transverse toward a coronal orientation by about 30° and the use of a preparation gradient pulse45 (link). A total of 156 whole-brain volumes were acquired in each of the two fMRI sessions (total 13 min). Physiological measurements of pulse (monitored with an infrared finger clip) and respiration (monitored with a chest belt) were obtained during fMRI acquisition. B0 field maps were acquired either before or after fMRI acquisition (TR = 488 ms; TE1 = 5.19 ms, TE2 = 7.65 ms; flip angle = 60°; distance factor = 25%; FOV = 240 mm; 41 slices; slice thickness = 3 mm). We additionally acquired a high-resolution 3D structural brain scan using a T1-weighted spin echo sequence (TI/TE/TR = 800/3.93/1540 ms, flip angle 9°, 1 × 1 × 1 mm isotropic resolution).
Eight channel head array coil
Manufactured by Siemens
Sourced in Germany
The Eight-channel head array coil is a medical imaging device designed for use in magnetic resonance imaging (MRI) systems. It is a specialized radiofrequency (RF) coil that is used to transmit and receive the electromagnetic signals required for MRI image acquisition. The core function of this coil is to provide a uniform and efficient way of detecting and amplifying the MRI signals from multiple regions of the human head, allowing for high-quality imaging and improved diagnostic capabilities.
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5 protocols using eight channel head array coil
1
Optimized fMRI Acquisition for Orbitofrontal Cortex
2
Whole-brain fMRI Acquisition for Cognitive Tasks
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The detailed fMRI protocol is described in Miskowiak et al. (2016a (link), b) (link) and the following is a short summary. Whole-brain MRI was performed with a 3-T Siemens Trio MR scanner using an eight-channel head array coil at the Danish Research Centre for Magnetic Resonance. BOLD-sensitive fMRI involved a T2∗-weighted echo-planar imaging (EPI) sequence with an echo time (TE) of 30 ms, repetition time (TR) of 2.49 s and a flip angle of 20° to minimize physiological noise. For the spatial WM task, a total of 184 brain volumes were acquired in a single fMRI session, each consisting of 42 slices acquired in interleaved order with a slice thickness of 3 mm and a field of view (FOV) of 192 × 192 mm using a 64 × 64 acquisition matrix. For the explicit picture encoding task, a total of 117 brain volumes were collected. High-resolution 3D structural T1-weighted images were obtained after the first session of BOLD fMRI (TI = 800, TE = 3.04, TR = 1550 ms, flip angle 9°; 256 × 256 FOV; 192 slices).
3
Longitudinal brain MRI acquisition protocol
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Baseline and follow-up MRI brain scans were performed on the same 3 Tesla MR scanner (Siemens Trio, Erlangen, Germany) using an eight-channel head array coil. Compatible MPRAGE T1 structural images were acquired at baseline and follow-up. Image acquisition settings—Baseline: TR = 1540 ms, TE = 3.93 ms, FA = 9°, matrix 256 × 256, 192 slices 1 × 1 × 1 mm voxels; Follow-up: TR = 1550 ms, TE = 3.04 ms, FA = 9°, matrix 256 × 256, 192 slices, 1 × 1 × 1 mm voxels, acquisition time 6.32 min.
4
Twins Neuroimaging: MZ and DZ Comparison
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MRI data were collected at the DRCMR, with a 3 T Siemens Trio MR scanner using an eightchannel head array coil. Blood oxygen-level dependent (BOLD)-sensitive fMRI used a T2*weighted gradient echo spiral echo-planar imaging (EPI) sequence with an echo time (TE) of 30 ms and repetition time (TR) of 2.49 ms. In the MZ study, the flip angle was 20° (which minimizes physiological noise; Gonzalez-Castillo et al., 2011) , while it was 90° in the parallel DZ study. The fMRI sequences included 279 brain volumes acquired in a single session, each consisting of 93 slices with a slice thickness of 3 mm and a field of view (FOV) of 192 by192 mm using a 64 by 64 grid. Since in the present study we included data from the MZ and DZ twins from the two parallel studies, we included the zygosity as a factor in the statistical models which would also account for the different flip angles for the fMRI data across participants.
High-resolution 3D structural T1-weighted spin echo images were obtained after the first session of BOLD fMRI (TI=800, TE=3.93, TR=1540 ms, flip angle 9°; 256 by 256 FOV; 192 slices). The present analyses focused on the effect of risk shared by MZ and DZ twins rather than the effect of zygosity, since the latter comparison would have been confounded by differences in fMRI data acquisition parameters between the MZ and DZ studies.
High-resolution 3D structural T1-weighted spin echo images were obtained after the first session of BOLD fMRI (TI=800, TE=3.93, TR=1540 ms, flip angle 9°; 256 by 256 FOV; 192 slices). The present analyses focused on the effect of risk shared by MZ and DZ twins rather than the effect of zygosity, since the latter comparison would have been confounded by differences in fMRI data acquisition parameters between the MZ and DZ studies.
5
Multimodal MRI Acquisition Protocol
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The MRI data acquisition was performed using a Siemens Trio MR scanner (Siemens Trio, Erlangen, Germany) with an eight-channel head array coil. BOLD-sensitive fMRI was acquired using a T2*-weighted gradient echo-planar imaging (EPI) sequence with following parameters: repetition time (TR) = 2.5 s, echo time (TE) = 26 ms, flip angle = 20° to minimize physiological noise (34) , 42 slices with a slice thickness of 3 mm, and a field of view (FOV) of 192×192 mm using a 64×64 grid. A total of 129 brain volumes were acquired in a single fMRI session with a duration of 5 min and 23 s. High-resolution 3D structural T1-weighted images were also obtained with following parameters: TI=800, TE=3.93, TR=1540 ms, flip angle 9°, 256×256 FOV, 192 slices. The MRI protocol used for the baseline and follow-up investigations was identical.
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