Magnetom aera 1.5 tesla

Multimodal imaging acquisitions were performed on each vine, from rootstocks to the beginning of branches, by Magnetic Resonance Imaging (MRI) and X-ray Computed Tomography (CT). MRI acquisitions were performed with Tridilogy, Groupe CRP—Imaneo (Tridilogy.com">http://www.Tridilogy.com) and the help of radiologists from CRP/Groupe Vidi at the Clinique du Parc (Castelnau-le-Lez, France), using a Siemens Magnetom Aera 1,5 Tesla and a human head antenna. Three acquisition sequences, T1-weighted(-w), T2-w, and PD-w were performed on each specimen, respectively:

3D T1 Space TSE Sagittal (Thickness 0.6 mm, DFOV 56.5 × 35 cm, 320 images, NEx 1, EC 1, FA 120, TR 500, TE 4.1, AQM 256/256).

3D T2 Space Sagittal (Thickness 0.9 mm, DFOV 57.4 × 35.5 cm, 160 images, NEx 2, EC 1, FA 160, TR 1100, TE 129, AQM 384/273).

Axial Proton Density Fat Sat TSE Dixon (Ep 5 mm, Sp 6.5, DFOV 57.2 × 38 cm, 40 images, NEx 1, EC 1, FA 160, TR 3370, TE 21, AQM 314/448).

X-ray CT acquisitions were performed at the Montpellier RIO Imaging platform (Montpellier, France, http://www.mri.cnrs.fr/en/) on an EasyTom 150 kV microtomograph (RX Solution). 3D volumes were reconstructed using XAct software (RX solution), resulting in approximately 2500 images per specimen at 177 µm/voxel resolution. Geometry, spot, and ring artifacts were corrected using the default correction settings when necessary.

Two different MR scanners, the Siemens MAGNETOM Aera 1.5 Tesla and the Siemens MAGNETOM Symphony 1.5 Tesla were used. Experienced pediatric radiologists reviewed the MRI scans. All scans were presented and discussed in institutional tumor board meetings.

MRA of the hip was performed by a musculoskeletal radiologist with 12 years’ experience (GC). After skin disinfection and the administration of local anesthesia with intramuscular injection of 1% lidocaine hydrochloride solution, the radiologist carried out an ultrasound-guided intra-articular hip injection of 15–20 ml of a solution of gadoterate meglumine (0.0025 mmol/mL) by using a pre-filled syringe for intra-articular use (Dotarem^®, Guerbet SA, Paris, France).
Scans were performed with the MAGNETOM Aera 1.5 Tesla (Siemens Medical Solution, Erlangen, Germany) and its body coil. T1-weighted sequence was obtained with a spoiled gradient echo 3D associated with DIXON technique for fat saturation (3D GRE T1 VIBE) on coronal plane: echo time 5.93 ms, repetition time 19.0 ms, flip angle 10°, section thickness 0.8 mm with isotropic voxel, field of view 206 × 192 mm, and matrix 238 × 256. Images were reconstructed on axial and oblique planes passing through the center of the femoral neck. Coronal, axial, and axial oblique images were exported (anonymized) in DICOM format and analyzed using OsiriX software (version 7.0; OsiriX, Geneva, Switzerland), implemented in a Macintosh operating system with a 21.5-in monitor (Power Macintosh G3; Apple, Cupertino, Calif).