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Allegra mri system

Manufactured by Siemens
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The Allegra MRI system is a magnetic resonance imaging (MRI) scanner manufactured by Siemens. It is designed to perform diagnostic imaging procedures. The Allegra MRI system uses strong magnetic fields and radio waves to generate detailed images of the body's internal structures.

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Lab products found in correlation

16 channel phase array coil, by Siemens (2 mentions) 32 channel whole head coil, by Siemens (1 mentions) Verio mri system, by Siemens (1 mentions)

Close spelling variants of this product

Magnetom 3T Allegra MRI system Allegra MRI Allegra system

11 protocols using allegra mri system

1

Functional MRI Acquisition Protocol

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All scanning was performed using a 3T Siemens Allegra MRI system with a whole-head coil. Visual stimuli were projected onto a screen that was viewed through a mirror attached to the participant's head coil. Functional echo-planar imaging (EPI) scans were oriented to intersect the anterior and posterior commissures (2000-ms TR, 15-ms TE, flip angle=82°, FOV=192×240, 34 slices, 3-mm isotropic voxels). For both sessions, a customized calibration scan was collected using the same slice prescription as the EPI scans for use as an in-plane spin-density image as well as an estimate of any inhomogeneities in the magnetic field. At the end of the second scan, a T1-weighted magnetization-prepared rapid-acquisition gradient echo (MPRAGE) sequence (1 mm isotropic voxels, 176 sagittal slices) was collected.
Tompary A, & Davachi L. (2017). Consolidation promotes the emergence of representational overlap in the hippocampus and medial prefrontal cortex. Neuron, 96(1), 228-241.e5.
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2

Functional MRI of Brain Imaging Protocol

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Participants were scanned on a 3 T Siemens Allegra MRI system with a 16-channel phase-array coil (Siemens, Erlangen, Germany) at ISMMS. All images were acquired along axial parallel to the anterior commissure-posterior commissure (AC-PC) plane. Eight runs of 139 T2* -weighted gradient-echo echo-planar imaging (EPI) images were acquired during each task with repetition time (TR) = 2500 ms, echo time (TE) = 27 ms, flip angle = 82°, field of view (FOV) = 240 mm, matrix size = 64 × 64, voxel size = 3.75 × 3.75 × 4 mm, and 40 axial slices of 4 mm thickness with no skip. Two additional images at the beginning of each run were discarded to allow for equilibration of T1 saturation effects. A T2-weighted anatomical volume of the whole brain was acquired using a turbo spin-echo pulse sequence (TR = 4050 ms, TE = 99 ms, flip angle = 170°, FOV = 240 mm, matrix size = 448 × 512, voxel size = 0.47 × 0.47 × 4 mm, 40 axial slices of 4 mm thickness with no skip). The entire scan session lasted approximately 1 h.
Wu T., Schulz K.P, & Fan J. (2020). Activation of the cognitive control network associated with information uncertainty. NeuroImage, 230, 117703.
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3

Structural and Functional MRI Acquisition

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All MRI scans were acquired on a 3 T Siemens Allegra MRI system at the Icahn School of Medicine at Mount Sinai. Each scan run started with two dummy volumes before the onset of the task to allow for equilibration of T1 saturation effects, followed by 168 image volumes. All image volumes were acquired along axial planes parallel to the anterior commissure-posterior commissure (AC-PC) line. A high-resolution T2-weighted anatomical image volume of the whole brain was acquired on an axial plane parallel to the AC–PC line with a turbo spin-echo pulse sequence with the following parameters: 40 axial slices 4-mm thick, skip = 0 mm, repetition time (TR) = 4050 ms, echo time (TE) = 99 ms, flip angle = 170°, field of view (FOV) = 240 mm, matrix size = 448×512, voxel size = 0.47×0.47×4 mm. Four runs of T2*-weighted image volumes were acquired with a gradient echo-planar imaging sequence using the following parameters: 40 axial slices, 4-mm thick and skip = 0 mm, TR = 2500 ms, TE = 27 ms, flip angle = 82°, FOV = 240 mm, matrix size = 64×64, in-plane resolution = 3.75×3.75×4 mm.
Xuan B., Mackie M.A., Spagna A., Wu T., Tian Y., Hof P.R, & Fan J. (2016). The Activation of Interactive Attentional Networks. NeuroImage, 129, 308-319.
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4

Functional MRI of Brain Imaging Protocol

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Participants were scanned on a 3 T Siemens Allegra MRI system with a 16-channel phase-array coil (Siemens, Erlangen, Germany) at ISMMS. All images were acquired along axial parallel to the anterior commissure-posterior commissure (AC-PC) plane. Eight runs of 139 T2* -weighted gradient-echo echo-planar imaging (EPI) images were acquired during each task with repetition time (TR) = 2500 ms, echo time (TE) = 27 ms, flip angle = 82°, field of view (FOV) = 240 mm, matrix size = 64 × 64, voxel size = 3.75 × 3.75 × 4 mm, and 40 axial slices of 4 mm thickness with no skip. Two additional images at the beginning of each run were discarded to allow for equilibration of T1 saturation effects. A T2-weighted anatomical volume of the whole brain was acquired using a turbo spin-echo pulse sequence (TR = 4050 ms, TE = 99 ms, flip angle = 170°, FOV = 240 mm, matrix size = 448 × 512, voxel size = 0.47 × 0.47 × 4 mm, 40 axial slices of 4 mm thickness with no skip). The entire scan session lasted approximately 1 h.
Wu T., Schulz K.P, & Fan J. (2020). Activation of the cognitive control network associated with information uncertainty. NeuroImage, 230, 117703.
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5

Functional MRI Acquisition Protocol

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Scanning was performed with a 3T Siemens Allegra MRI system using a single-channel, whole-head coil. Functional data were acquired using a gradient-echo, echo-planar pulse sequence (TR = 2220 msec; TE = 30 msec; 38 slices oriented about 30° rotated counter-clockwise from AC-PC line, which was adjusted individually to maximize coverage; (3 × 3 × 3) mm3 voxel size, .6 mm interslice gap; 244 volume acquisitions in each of five runs). High resolution T1-weighted (MP-RAGE) images were collected from each participant for anatomical visualization.
Tian X., Zarate J.M, & Poeppel D. (2016). Mental imagery of speech implicates two mechanisms of perceptual reactivation. Cortex; a journal devoted to the study of the nervous system and behavior, 77, 1-12.
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6

High-Resolution 3T MRI Brain Imaging

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Scanning was performed on a 3-T Siemens Allegra MRI system at the Lewis Center for Neuroimaging at the University of Oregon using a 32-channel whole-head coil. High-resolution (0.5 × 0.5 × 1 mm) T1-weighted image was collected for anatomical visualization and normalization. Functional data were acquired using a gradient-echo, echo-planar pulse sequence (repetition time = 2000 ms, echo time = 30 ms, 31 interleaved slice acquisition, 3 × 3 × 3 mm voxel size). The first eight volumes of each session were discarded to allow for magnetic field stabilization.
Gagnepain P., Hulbert J, & Anderson M.C. (2017). Parallel Regulation of Memory and Emotion Supports the Suppression of Intrusive Memories. The Journal of Neuroscience, 37(27), 6423-6441.
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7

Multimodal 3T MRI Brain Imaging Protocol

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All MRI data were acquired on a 3T Allegra MRI system (Siemens, Germany) using a birdcage head coil. Scans were collected in a single session, with the following pulse sequences: (1) T1-weighted 3D images, with partitions acquired in the sagittal plane using a modified driven equilibrium Fourier transform (Deichmann et al., 2004 (link)) sequence (TE/TR/TI: 2.4/7.92/910 ms, flip angle: 15°, 1 mm3 isotropic voxels); and (2) diffusion-weighted volumes were also acquired using SE echo-planar imaging (TE/TR: 89/8500 ms, bandwidth: 2126 Hz/voxel, matrix: 128 × 128, 80 axial slices, voxel size: 1.8 × 1.8 × 1.8 mm3) with 30 non-collinear distributed orientations for the diffusion sensitizing gradients at a b-value of 1000 s/mm2 and 6 b = 0 images. Diffusion-weighted scanning was repeated three times to increase the signal-to-noise ratio.
Images were also visually inspected for movement artifacts; subjects with excessive movement in their scans were excluded.
Phillips O.R., Joshi S.H., Squitieri F., Sanchez-Castaneda C., Narr K., Shattuck D.W., Caltagirone C., Sabatini U, & Di Paola M. (2016). Major Superficial White Matter Abnormalities in Huntington's Disease. Frontiers in Neuroscience, 10, 197.
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8

Functional Imaging of the Hippocampus

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All scanning was performed using a 3T Siemens Allegra MRI system with a whole-head coil. Visual stimuli were projected onto a screen that was viewed through a mirror attached to the participant’s head coil. Functional data was collected using a zoomed high-resolution echo-planar pulse (EPI), with oblique coronal slices aligned perpendicular to the long axis of the hippocampus (1500-ms TR, 22-ms echo time (TE), FOV=192 × 96, 21 slices, 1.5 × 1.5 × 3-mm voxels, 77° flip angle). The field of view was decreased in the phase encode direction to reduce the total read out time and, thus, minimize distortions and artifacts (Olman et al., 2009 (link)). Saturation bands were used to suppress signal for tissue superior and inferior to the coverage of the scan. For whole brain coverage, we collected a T1-weighted high-resolution magnetization-prepared rapid-acquisition gradient echo (MPRAGE) sequence (1 × 1 × 1 mm voxels, 176 sagittal slices). We also collected a T2-weighted 2D image (5100-ms TR, 88-ms echo time (TE), .898 × .898 × 1.5 mm voxels) in the same plane as the functional volumes. Finally, a field map sequence was collected to obtain estimates of the magnetic field and an in-plane spin-density image.
Tompary A., Duncan K, & Davachi L. (2016). High-resolution investigation of memory-specific reinstatement in the hippocampus and perirhinal cortex. Hippocampus, 26(8), 995-1007.
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9

fMRI Acquisition Protocols for Brain Imaging

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For Study 1, the functional magnetic resonance images were obtained using a 3 T Siemens Allegra MRI system. Functional scans were acquired by a T2*-weighted gradient-echo, echo-planar pulse sequence in ascending interleaved order (3.5 mm slice thickness, 3.5 × 3.5 mm in-plane resolution, 64 × 64 voxels per slice, flip angle = 90°, FOV = 224). Echo time (TE) was 30 ms and repetition time (TR) was 2000 ms. A T1-weighted image was acquired for anatomical reference (1.0 × 1.0 × 1.0 mm resolution, 192 sagittal slices, flip angle = 9°, TE = 2.6 ms, TR = 2250 ms). For Study 2, the functional magnetic resonance images were collected using a 3 T Siemens Verio MRI system. Functional scans were acquired by a T2*-weighted gradient-echo, echo-planar pulse sequence in descending interleaved order (3.0 mm slice thickness, 3.0 × 3.0 mm in-plane resolution, 64 × 64 voxels per slice, flip angle = 75°). TE was 30 ns and TR was 2030 ms. A T1-weighted image was acquired for anatomical reference (1.0 × 0.5 × 0.5 mm resolution, 192 sagittal slices, flip angle = 9°, TE = 2.26 ms, TR = 1900 ms).
Speer S.P, & Boksem M.A. (2020). Decoding fairness motivations from multivariate brain activity patterns. Social Cognitive and Affective Neuroscience, 14(11), 1197-1207.
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10

Multimodal MRI Acquisition Protocol

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All MRI data were acquired on a 3T Allegra MRI system (Siemens, Germany) using a birdcage head coil. Scans were collected in a single session, with the following pulse sequences: 1) T1-weighted 3D images, with partitions acquired in the sagittal plane using a modified driven equilibrium Fourier transform (Deichmann et al., 2004 (link)) sequence (TE/TR/TI: 2.4/7.92/910 ms, flip angle: 15°, 1 mm3 isotropic voxels); and 2) diffusion-weighted volumes were also acquired using SE echo-planar imaging (TE/TR: 89/8500 ms, bandwidth: 2126 Hz/voxel, matrix: 128 × 128, 80 axial slices, voxel size: 1.8 × 1.8 × 1.8 mm) with 30 non-collinear distributed orientations for the diffusion sensitizing gradients at a b value of 1000 s/mm2 and 6 b = 0 images. Scanning was repeated three times to increase the signal-to-noise ratio.
Images were also visually inspected for movement artifacts; subjects with excessive movement in their scans were excluded.
Phillips O.R., Joshi S.H., Piras F., Orfei M.D., Iorio M., Narr K.L., Shattuck D.W., Caltagirone C., Spalletta G, & Di Paola M. (2016). The superficial white matter in Alzheimer's disease. Human Brain Mapping, 37(4), 1321-1334.
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