The local Institutional Review Boards approved this study and written informed consent was obtained prior to inclusion. The scans were acquired with two 3T Philips Achieva MRI systems (Philips Healthcare, Best, the Netherlands) at two centers: site 1 and site 2. At each site 10 healthy volunteers were included (in total, 20 healthy volunteers, six females; mean age of 36 years, range 25–60 years). Healthy volunteers were asymptomatic and did not have any previous history related to spinal diseases.
Achieva mri system
Manufactured by Philips
Sourced in Netherlands
The Achieva MRI system is a magnetic resonance imaging (MRI) scanner manufactured by Philips. It is designed to capture detailed images of the body's internal structures, enabling healthcare professionals to diagnose and monitor various medical conditions. The Achieva MRI system utilizes powerful magnetic fields and radio waves to generate high-quality images, which can be used for a wide range of clinical applications.
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Lab products found in correlation
32 channel head coil, by Philips (5 mentions)
16 channel neurovascular coil, by Philips (2 mentions)
Head coil, by Philips (2 mentions)
32 channel sense, by Philips (2 mentions)
8 channel sense phased array head coil, by Philips (2 mentions)
E prime software, by Psychology Software Tools (1 mentions)
Matlab 8, by MathWorks (1 mentions)
8 channel head coil, by Philips (1 mentions)
32 channel sense head coil, by Philips (1 mentions)
Extended mr work space ver 2, by Philips (1 mentions)
Omnipaque 350, by GE Healthcare (1 mentions)
43 protocols using achieva mri system
1
Healthy Volunteer MRI Spinal Scans
2
Rapid Imaging with Hyperbolic Secant Pulses
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All the experiments were performed on Achieva MRI systems (Philips Healthcare, Best, the Netherlands) at 3 or 7 T, complemented with symmetrically biased transmit‐receive switches30 with switching times of approximately 3 μs at 3 T and 1 μs at 7 T, custom‐made spectrometers31 with up to 4 MHz acquisition bandwidth and short digital filters with group delays down to 1.2 μs. Moreover, the 3 T scanner was equipped with a high‐performance gradient insert system capable of reaching 200 mT/m at full duty cycle32 and a broadband linear RF power amplifier BLA1000‐I E (Bruker Biospin, Wissembourg, France). Largely 1H‐free RF coils were used for both transmission and reception, a surface coil of 80 mm diameter and two birdcage coils.33 , 34 Block and sweep hyperbolic secant (HSn) pulses35 with bandwidth matching the imaging bandwidth were used for excitation. HSn pulses were chosen for high bandwidth imaging, where block pulses posed too strong limitations on flip angles due to the combination of limited RF power and short durations. The pulse power was set empirically to obtain maximum signal in the tissues of interest. Flip angles were not calibrated but estimated to range from 2 to 4 degrees.
3
Multimodal Brain Imaging Protocol
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The experiment was performed in the Department of Radiology of Zhujiang Hospital, Southern Medical University, China. Anatomical scans of the brain were collected prior to stimulation imaging. Then, all subjects were subjected to a T1 weighted MRI and an rs-fMRI scan, each of which took 6 min.
Structural and functional scans were acquired with a 3.0 T Philips Achieva MRI System (Royal Philips Electronics, Eindhoven, The Netherlands) with an eight-channel head array coil equipped for echo planar imaging. The images were axial and parallel to the anterior commissure–posterior commissure line, which covered the whole brain. Structural images were collected prior to functional imaging using a T1-weighted fast spin echo sequence [repetition time (TR) = 25 ms, echo time (TE) = 3 ms, flip angle (FA) = 30°, field of view (FOV) = 230 mm × 230 mm, acquisition matrix = 192 × 256, slice thickness = 2 mm]. Blood oxygenation level-dependent functional imaging was acquired using a T2*-weighted, single-shot, gradient-recalled echo planar imaging sequence (TR = 2000 ms, TE = 40 ms, FA = 90°, FOV = 220 mm × 220 mm, acquisition matrix = 144 × 144, slice thickness = 1 mm). In addition, T1 MRI and fMRI image collection was preceded by five dummy scans to minimize gradient distortion.
Structural and functional scans were acquired with a 3.0 T Philips Achieva MRI System (Royal Philips Electronics, Eindhoven, The Netherlands) with an eight-channel head array coil equipped for echo planar imaging. The images were axial and parallel to the anterior commissure–posterior commissure line, which covered the whole brain. Structural images were collected prior to functional imaging using a T1-weighted fast spin echo sequence [repetition time (TR) = 25 ms, echo time (TE) = 3 ms, flip angle (FA) = 30°, field of view (FOV) = 230 mm × 230 mm, acquisition matrix = 192 × 256, slice thickness = 2 mm]. Blood oxygenation level-dependent functional imaging was acquired using a T2*-weighted, single-shot, gradient-recalled echo planar imaging sequence (TR = 2000 ms, TE = 40 ms, FA = 90°, FOV = 220 mm × 220 mm, acquisition matrix = 144 × 144, slice thickness = 1 mm). In addition, T1 MRI and fMRI image collection was preceded by five dummy scans to minimize gradient distortion.
4
Diffusion Tensor Imaging of the Brain
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Brain DTI were acquired using a 3.0-T Achieva MRI system (Philips Medical Systems, Best, the Netherlands) with a 32-channel sensitivity encoding (SENSE) head and neck coil. DTI images were acquired with transverse orientation using a pulse sequence with a single shot spin-echo diffusion-sensitised echo-planar imaging sequence (15 gradient directions plus B0 image with b-value = 800 s/mm2, repetition time/echo time = 13898 ms/55 ms, field of view = 224 × 224, matrix = 112 × 112, number of average = 2, slice thickness = 2.0 mm, and flip angle = 90°). The SENSE acceleration factor was not applied to increase the signal to noise ratio.
5
Whole-Brain fMRI Acquisition Protocol
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Scanning was performed with a standard whole-head coil on a 3-T Philips Achieva MRI system (Best, The Netherlands) in the Leiden University Medical Center. During the task, two runs of at least 420 T2*-weighted whole-brain EPIs were acquired, including two dummy scans preceding the scan to allow for equilibration of T1 saturation effects (TR = 2.2 s; TE = 30 ms, flip angle = 80°, 38 transverse slices, 2.75 × 2.75 × 2.75 mm +10% interslice gap). Stimuli were projected onto a screen that was viewed through a mirror at the head end of the scanner. After the functional runs, a high-resolution EPI scan (flip angle = 80°, 84 transverse slices, 1.964 × 1.964 × 2 mm) and a B0 field map were acquired for registration purposes. This was followed by a 3-D T1-weighted scan (TR = 9.8 ms; TE = 4.6 ms, flip angle = 8°, 140 slices, 1.166 × 1.166 × 1.2 mm, FOV = 224.000 × 177.333 × 168.000).
6
Placenta MRI Segmentation Protocol
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The input datasets were acquired by a 1.5 T Philips Achieva MRI system using a 32 channel cardiac array for signal reception. A total of four placentas with gestational age ranging from 24 to 37 weeks were motion-compensated by the technique of Kainz et al. [23] and segmented using the approach of Alansary et al. [27] . The resulting motioncompensated placenta masks are defined on a 0.75 × 0.75 × 0.75 mm volumetric lattice and are shown in Figure 3 in the segmentation step.
We post-process the segmentation masks by applying a morphological opening with a spherical structuring element of radius five voxels to remove small local noise and objects. Afterwards, we perform morphological closing to fill small holes, again with a spherical structuring element but of radius ten voxels. The final mask of the placenta is then used in the subsequent steps.
We post-process the segmentation masks by applying a morphological opening with a spherical structuring element of radius five voxels to remove small local noise and objects. Afterwards, we perform morphological closing to fill small holes, again with a spherical structuring element but of radius ten voxels. The final mask of the placenta is then used in the subsequent steps.
7
Abdominal MRI Acquisition Protocol
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Abdominal MR images were acquired from a 3 T Achieva MRI system (Philips Healthcare, Best, The Netherlands) with an array coil with 32 receiver channels. The T1 high-resolution isotropic volume excitation (eTHRIVE) images were obtained with the following parameters: repetition time (TR)/echo time (TE) = 4.2/1.97 ms; field of view = 38 × 38 × 14 cm3; number of excitation = 2; slice thickness = 0.74 × 0.74 × 2.0 mm3; number of slices = 100; matrix size = 512 × 512 pixels; and scan time = 16 s.
8
Functional MRI Acquisition Protocol for Whole-Brain Imaging
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Imaging scans were all acquired on 3.0 T Achieva MRI system (Philips). All functional data and localizer scans were collected in 3-mm thick oblique axial slices with echo planar imaging (EPI) sequence (repetition time (TR) = 2000 ms, echo time (TE) = 28 ms; 80 × 78 × 3.7 matrix, slice thickness = 3 mm; 0.3 mm gap). Slices were angulated in an oblique axial manner to reach whole-brain coverage. To ensure reaching a steady state condition, the first two scans were discarded. This resulted in approximately 1320 (on average 700 and 620) scans for encoding and 300 (2 × 150) scans for the localizer. At the end of the experiment, a T1-weighted structural image (256 × 256 × 172 matrix, 1 × 1 × 1.3 mm voxels) was also collected. This structural MRI image was used in data analyses for coregistration and segmentation.
9
Functional MRI Acquisition Protocol
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All participants were scanned on a 3-Tesla whole body Philips Achieva MRI system (Best, The Netherlands). Functional data were acquired using a single shot GE-EPI sequence during two functional runs of 213 volumes each, of which the first 4 volumes were discarded to allow for equilibration of T1 saturation effects (TR = 2 s), echo time = 27.63 ms, 37 slices of 3 mm × 3 mm × 3 mm (slice gap = 0.3 mm), field of view (FOV) 240 mm2, and 80 × 80 matrix. Two high-resolution T1-weighted anatomical scans were obtained: 3DFFE, multi-shot turbo field echo (TFE): TR = 8.2 ms; TE = 3.8 ms, 220 slices, voxel size = 1 × 1 × 1 mm3, FOV = 240 × 188, matrix = 80, and 2D SENSE: P(RL) = 2.5 and S(FH) = 2. Head motion was restricted using a pillow and foam inserts that surrounded the head. Visual stimuli were projected onto a screen that was viewed through a mirror.
10
fMRI Study of Pain-Avoidance Learning
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We acquired fMRI data on a 3T Philips Achieva MRI system (Best, The Netherlands) at the Leiden University Medical Center, using a standard whole-head coil. Stimulus presentation and data acquisition were controlled using E-Prime software (Psychology Software Tools). Visual stimuli were presented via a mirror attached to the head coil, and participants responded with their right hand via an MRI-compatible response unit. The pain-avoidance learning task was divided across four scan runs. Each run lasted 581 s (264 TRs), after discarding the first 5 TRs which served as dummy scans. Functional images were acquired with a T2*-weighted whole-brain echo-planar imaging sequence (TR = 2.2 s; TE = 30 ms, flip angle = 80°, 38 transverse slices oriented parallel to the anterior commissure-posterior commissure line, voxel size = 2.75 × 2.75 × 2.75 mm + 10% interslice gap). In addition, we acquired a high-resolution T1-weighted scan (TR = 9.8 ms; TE = 4.6 ms, flip angle = 8°, 140 slices, 1.17 × 1.17 × 1.2 mm, FOV = 224 × 177 × 168), at the beginning of the scan session.
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