MRI was obtained on a 3.0 tesla Philips Achieva device. Sequences performed precontrast were 2D axial proton density-and T2-weighted, 15 direction diffusion tensor imaging (DTI) with b = 1000 DTI. 3D sagittal T1 magnetization prepared rapid acquisition gradient echo (MPRAGE), and T2 weighted fluid attenuated inversion recovery (FLAIR) with approximately 1 mm isotropic resolution. Gadolinium based contrast agent was injected slowly over approximately one minute while high resolution 0.55 isotropic susceptibility weighted imaging was obtained. Following this post contrast images were obtained using 3D sagittal T1 fast field echo (FFE) and T2 Weighted FLAIR techniques. DTI data was processed to generate diffusion weighted imaging (DWI) and apparent diffusion coefficient (ADC) images. Scans were evaluated in duplicate. A neuroradiologist and a neurologist performed separate evaluations. Differences in interpretation were resolved through consultation.
3.0 tesla
Manufactured by Philips
The 3.0 Tesla is a magnetic resonance imaging (MRI) system produced by Philips. It operates at a magnetic field strength of 3 Tesla, which is a measure of the intensity of the magnetic field used to acquire images of the body's internal structures. The 3.0 Tesla system is designed to provide high-quality diagnostic images for medical professionals.
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3 protocols using 3.0 tesla
1
Multimodal MRI Protocol for Brain Imaging
2
4D Flow MRI of Thoracic Aorta in TAVR Patients
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The TAVR patients and controls underwent cardiac and respiratory-gated sagittal 4D flow MRI of the thoracic aorta at 3.0 Tesla (Philips). Standard transmit and receive cardiac coils were used for 4D flow measurements. 4D flow MRI sequence parameters were as follows: spatiotemporal resolution: 2.5 × 2.5 × 2.5 mm3, temporal resolution: ± 40ms (24 timeframes); TE/TR/FA = 2.1 ms/3.4 ms/8°; VENC: 150–250 cm/s; k-t PCA acceleration factor: 8. Two-al (2D) phase-contrast MRI scout measurements at the level of the sinotubular junction were conducted to estimate the optimal velocity encoding to minimise velocity aliasing. SAVR patients were included as part of a previously published study and underwent 4D flow MRI at 1.5 Tesla with scan parameters as earlier described [14 (link)].
3
Harmonized MRI Data Collection Protocols
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Detailed descriptions of the MRI acquisition protocols 20 and inter-site neuroimaging harmonization steps are available elsewhere. 31 Briefly, neuroimaging data were collected from two scanners (GE 3.0 Tesla Discovery/Phillips 3.0 Tesla Achieva), including a whole-brain isotropic T 1 -weighted turbo gradient echo sequence (3:33/9:53 min) at 1-mm 3 resolution; repetition time (TR) = 6.4/6.5 (ms); echo time (TE) = 2.8/3 (ms); flip angle = 15 /8 ; inversion time (TI) = 450/950 (ms); field of view (FOV) = 256 mm; and matrix dimensions = 240 × 240 voxels. Cross-site T 1 -weighted imaging included a traveling phantom head to investigate potential scanner differences.
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