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12 channel head coil

Manufactured by Philips
Sourced in Netherlands

The 12-channel head coil is a specialized piece of laboratory equipment designed for use in magnetic resonance imaging (MRI) systems. Its core function is to transmit and receive radio frequency (RF) signals for the acquisition of high-quality images of the human head and brain. The 12-channel design allows for enhanced signal-to-noise ratio and improved spatial resolution in MRI studies.

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11 protocols using 12 channel head coil

1

Neuroimaging Protocol for Cognitive Tasks

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Imaging data were collected via a 3T Philips Intera Scanner, located at the Department of Radiology of the University Hospital in Leuven, with a 12-channel head coil. Functional images were collected with an EPI sequence (47 slices, 2 × 2 mm in plane voxel size, slice thickness 2 mm, interslice gap 1 mm, TR = 3000 ms, TE = 30 ms, flip angle = 90 degrees, 104 × 104 matrix). We acquired a high-resolution T1-weighted anatomical image (182 slices, resolution 0.98 × 0.98 × 1.2 mm, TR = 9.6 ms, TE = 4.6 ms, 256 × 256 acquisition matrix) for each participant. Stimuli were presented with PsychToolbox 3 (Brainard, 1997 (link)) and displayed via a Barco 6400i LCD projector onto a screen located approximately 35 cm from participants’ eyes, which was visible via a mirror attached to the head coil. Participants answered by pressing one of two response buttons on a response box, which they controlled with their right hand.
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2

Resting-State fMRI Acquisition Protocol

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MRI data were acquired using an Achieva 3.0-T MRI scanner with a 12-channel head coil (Philips, Amsterdam, The Netherlands). Prior to scanning, each subject was asked to rest for 20 min. During MRI scanning, subjects were instructed to close their eyes, remain conscious, and avoid active thinking. Foam padding was utilized for noise mitigation and to limit head movements. For each subject, resting-state functional imaging was obtained using the echo-planar image (EPI) technique with the following parameters: repetition time (TR) = 2,000 ms, echo time (TE) = 30 ms, 31 slices and 180 volumes, slice thickness = 5 mm, slice gap = 1 mm, voxel size = 3.44 × 3.44 × 6.00 mm, field of view = 220 × 220 mm, flip angle = 90°, scanning time = 360 s.
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3

Resting-state fMRI Acquisition Protocol

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Magnetic resonance imaging data were acquired using an Achieva 3.0-T MRI scanner with a 12-channel head coil (Philips, Amsterdam, Netherlands). Prior to scanning, each subject was asked to rest for 20 min. During MRI scanning, subjects were instructed to close their eyes, remain conscious, and avoid thinking about anything. Foam padding was utilized for noise mitigation and limitation of head movements. For each subject, resting-state functional imaging was obtained using the echo-planar image (EPI) technique with the following parameters: repetition time (TR) = 2,000 ms, echo time (TE) = 30 ms, 31 slices and 180 volumes, slice thickness = 5 mm, slice gap = 1 mm, voxel size = 3.44 mm × 3.44 mm × 6.00 mm, field of view = 220 mm × 220 mm, flip angle = 90°, and scanning time = 360 s.
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4

High-Resolution Multimodal MRI Acquisition

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Imaging data were acquired using a 3 Tesla MRI scanner (Philips Medical System, Best, Netherlands) equipped with a 12-channel head coil. A high resolutional structural T1-image [repetition time (TR)/echo time (TE) = 8/3 ms, flip angle: 8°, matrix: 320x320x195, voxel size: 0.75x0.75x1 mm] was acquired. An echo planar imaging sequence was used to acquire the fMRI data (TR/TE = 3000/35 ms, flip angle: 90°, matrix: 128x128x32, voxel size: 1.8x1.8x4 mm) with a duration of 5 minutes.
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5

Spatial ICA of Functional Brain Networks

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Functional images were acquired on a Philips 3-Tesla scanner equipped with a 12-channel head coil. Each image was realigned, normalised (unwarped) and smoothed using statistical parametric mapping software (SPM8) (Friston et al., 1995 ). Spatial ICA was applied across all subjects and (concatenated) sessions in the fMRI Software Library (FSL). The ICA decomposition generated 70 components, or “modes”, of neuronal, physiological and artefactual origin (Beckmann and Smith, 2004 (link)). We identified eight canonical neuronal modes representing emotional, cognitive and perceptual systems of clear relevance to attention and interoception during movie viewing, namely: auditory (AUD); default mode network (DMN); executive control (EXC); left insula (L-INS); right insula (R-INS); left frontoparietal attention (LFP); medial visual pole (MVP); and right frontoparietal attention (RFP; Fig. 1) (Damoiseaux et al., 2006 (link)). All components, with the exception of L-INS and R-INS, were matched with previously identified cognitive and sensory networks (Smith et al., 2009 (link)), using spatial cross-correlation. The insula modes were identified by first determining the coordinates of bilateral anterior insula cortices using PickAtlas, and using these coordinates to identify anatomically concordant ICA components. Additional acquisition and analytic information is provided in the Supplement.
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6

MRI Acquisition Protocol for Brain Imaging

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MRI data were acquired using an Achieva 3.0-T MRI scanner with a 12-channel head coil (Philips, Amsterdam, Netherlands). During the scanning process, rubber earplugs were used to reduce noise and foam pads used to fix the head to minimize potential motion artifacts. Subjects were instructed to stay awake and relaxed, think of nothing, and keep their eyes closed. Fast gradient echo sequences were used to obtain T1W structural images. The scanning parameters were as follows: repetition time (TR) = 7.8 ms, echo time (TE) = 3.4 ms, slice thickness = 1.4 mm, layer spacing = 1.4 mm, flip angle = 20°, layer number = 176.0 mm, visual field = 240 × 240 mm, voxel size = 1 × 1 × 1 mm, matrix = 256 × 256, and scanning time = 5 min 49 s. Moreover, no obvious lesions were identified in all T1 images after visually checked by two experience radiologists.
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7

Resting-State fMRI Acquisition Protocol

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The participants were scanned using an Achieva 3T MRI scanner (Philips, the Netherlands) with a 12-channel head coil. Resting-state fMRI scans were collected for a gradient-echo echo planar imaging (EPI) sequence: repetition time = 2,000 ms, echo time = 30 ms, number of slices = 31, slice thickness/gap = 5/1 mm, acquisition matrix = 64 × 64, field of view = 220 mm × 220 mm, flip angle = 90°, and 180 dynamics. The participants were required to stay still, keep their eyes closed, avoid thinking about anything other than the task, and remain awake. In order to reduce noise and prevent head motion, headphones and padding were used throughout the scans. The entire acquisition lasted ~6 min.
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8

Multimodal MRI Neuroimaging Protocol

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MRI scans were acquired using an Achieva 3 T MRI scanner (Philips) with a 12‐channel head coil. The subjects were instructed to lie still, close their eyes, and avoid falling asleep during the scan. Headphones and padding were used to reduce noise and prevent head motion. The scanning parameters were as follows: (a) a two‐dimensional structural MRI with a T2‐weighted sequence (repetition time (TR)/echo time (TE) = 3,000/80 ms, field of view (FOV) = 24 × 24 cm2, NEX2, thickness = 5 mm, and slice gap = 1 mm); (b) a high‐resolution anatomical scan using a three‐dimensional (3D) magnetization‐prepared rapid gradient echo (MPRAGE) sequence (TR/TE = 2,000/3.5 ms, matrix = 512 × 512 × 156, and FOV = 240 × 240 × 156 mm3); (c) an rs‐fMRI scan (TR/TE = 2,000/30 ms, FOV = 220 × 220 mm2, slice thickness = 5 mm, slice gap = 1 mm, acquisition matrix = 64 × 64, flip angle = 90°, and voxel size = 3.44 mm × 3.44 mm × 6.00 mm, with 31 slices and 180 dynamics); and (d) diffusion tensor imaging (DTI) with TR/TE = 1,000/15 ms; matrix = 128 × 128; FOV = 240 × 240 mm2; 64 axial slices (thickness = 2.0 mm); and 32 nonlinear gradient directions (b = 0, 1,000 s/mm2).
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9

Structural and Functional MRI of Brain

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Magnetic resonance imaging data were obtained using an Achieva 3T MRI scanner (Philips, Amsterdam, Netherlands) with a 12-channel head coil. High-resolution 3D structural T1-weighted images were acquired using a magnetization-prepared rapid gradient echo (MPRAGE) sequence with the following parameters: repetition time (TR) = 7.8 ms, echo time (TE) = 3.4 ms, flip angle (FA) = 9°, number of slices = 176, slice thickness = 1 mm, field of view (FOV) = 256 mm × 256 mm, and matrix = 256 × 256, resulting in an isotropic voxel size of 1 mm × 1 mm × 1 mm. Functional MRI data were acquired using an echo planar imaging sequence: TR = 2,000 ms; TE = 30 ms; FA = 90°; FOV = 220 mm × 220 mm; matrix = 64 × 64; in-plane resolution = 3.44 mm × 3.44 mm, slice thickness = 3.5 mm; interslice gap = 0.5 mm, and number of slices = 41, measuring a total of 225 volumes. To minimize head motion, foam padding was placed between the head and coil. To reduce scanner noise, each subject was given a set of earplugs. During scanning, the subjects were instructed to remain motionless, with their eyes closed, and not think about anything in particular. All subjects reported that they had not fallen asleep during the imaging protocol.
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10

High-Resolution fMRI Imaging Protocol

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Data were acquired on a 3T Philips Intera Scanner (Department of Radiology, KU Leuven) with a 12-channel head coil. Functional images were obtained with a T2*-weighted echo-planar image (EPI) sequence with 48 oblique transverse slices, in-plane resolution 2.1 mm, slice thickness 2 mm, interslice gap .1 mm, repetition time (TR) = 3000 ms, echo time (TE) = 30 ms, flip angle = 90, 104 × 104 matrix). For each participant, a high-resolution T1-weighted anatomical image was obtained (182 slices, resolution 0.98 × 0.98 × 1.2 mm, TR = 9.6 ms, TE = 4.6 ms, 256 × 256 acquisition matrix).
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