Chest MRIs were performed using a 1.5-T SIGNA™ Artist (GE Healthcare) by three radiologists with full parallel imaging capabilities and a minimum of 3-years of experience. The breath-hold imaging protocol was utilized. MRI workstation SIGNA™ Artist (GE Healthcare) was used as the imaging platform. Coronal and axial T2 and T1-weighted images with a 2-mm slice thickness, 192×256 matrix size and 44 cm field of view were evaluated for image analysis (8 (link)). Apparent transverse relaxation time was 2 msec.
Signa artist
Manufactured by GE Healthcare
Sourced in United States
The Signa Artist is a magnetic resonance imaging (MRI) system developed by GE Healthcare. It is designed to deliver high-quality diagnostic images for a wide range of clinical applications. The system features advanced imaging capabilities and a user-friendly interface.
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14 protocols using signa artist
1
Chest MRI Protocol for Radiologic Evaluation
2
Multimodal Prostate MRI Acquisition
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Pre-treatment MRIs (MRI0) were acquired on MR systems at our center (1.5-T Ambition Blueseal, Philips, Best, The Netherland, and 3-T MR-750W, General Electrics, Milwaukee, WI, USA) and outside center (1.5-T Signa Artist, General Electrics, Milwaukee, WI, USA; 1.5-T Ingenia, Philips, Best, The Netherland). Abdominal surface arrays were used without endorectal coils. All protocols comprised, at least, one axial and one sagittal turbo spin echo T2-WI (TE/TR = 70–192/3442–6135 msec, matrix = 220 × 220–288 × 288, field-of-view = 200–240 × 178–240, in-plane resolution = 0.6 × 0.6–0.8 × 0.8 mm2, slice thickness = 3 mm), and, not systematically, axial diffusion-weighted imaging (DWI, with the following b-values: 0, 100 and 1000 s·mm−2, TE/TR = 60–200/3400–4000 msec, matrix = 80–120/80–120, field-of-view = 160 × 160, in-plane resolution = 1.6–2.6 × 1.6–2.6 mm2, slice thickness = 4–4.7 mm). Apparent diffusion coefficient (ADC) maps were reconstructed using a mono-exponential decay model.
3
Cardiac MRI Contrast Image Reconstruction
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CMR examinations were performed on a 1.5T whole body clinical MR system (SIGNA Artist, GE Healthcare) with a dedicated anterior array coil, electrocardiographic gating, and breath-hold techniques. The imaging protocol consisted of balanced steady-state free precession cine images and 2D LGE imaging. LGE imaging was performed 10–20 min after intravenous administration of a gadolinium-based contrast agent (0.15 to 0.2 mmol/kg; Gadovist, Bayer Healthcare), using a breath-held 2D-segmented inversion recovery gradient echo pulse sequence with magnitude reconstruction. LGE images were obtained in standard long-axis and SA views, with coverage from base to apex. Typical scan parameters were slice thickness 8 mm, interslice gap 2 mm, TR/TE 6.5/3.0 ms, flip angle 25°, ASSET 1.5, NEX 1, field of view 256–410 × 320–430 mm, acquired matrix 200 × 192, and reconstructed to a pixel size of 1.3–2.1 × 1.1–1.5 mm. If necessary, the preset inversion time was adjusted to null normal myocardium.
LGE images were reconstructed multiple times from the same source data: once using the vendor standard reconstruction, then again using the vendor-supplied DLRecon prototype. For this study, LGE images were reconstructed with a NR level of 25%, 50%, 75%, and 100%.
LGE images were reconstructed multiple times from the same source data: once using the vendor standard reconstruction, then again using the vendor-supplied DLRecon prototype. For this study, LGE images were reconstructed with a NR level of 25%, 50%, 75%, and 100%.
4
Magnetic Resonance Imaging of Peripheral Nerve Plexuses
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All examinations were performed on a clinical 1.5-T MRI System (SIGNA™ Artist, GE HealthCare, Waukesha, WI, USA). Patients were scanned in supine position using a combined coil setup for the lumbosacral plexus of a 30-channel anterior array coil and a 40-channel posterior array. For the brachial plexus a 19-channel head/neck coil was added. Coronal 3D T2-weighted short tau inversion recovery fast spin echo with variable flip angles (“CUBE-STIR”) sequences were obtained covering both sides as part of the institution’s standard MR plexus neurography protocol, before administration of gadolinium intravenous contrast.
Pulse sequence parameters are listed in Table2 . No compressed sensing acquisition or parallel imaging was utilized.
Pulse sequence parameters are listed in Table
Parameters of 3D STIR-FSE CUBE sequence
| Parameter | Brachial plexus | Lumbosacral plexus |
|---|---|---|
| Field of view (FOV) (cm) | 32 | 38 |
| Matrix (frequency× phase) | 268 × 268 | 288 × 282 |
| Slice thickness (mm, 0.8-mm gap) | 1.6 | 1.6 |
| Number of slices (median) | 116 | 135 |
| Inversion time (TI) (ms) | 180 | 180 |
| Repetition time (TR) (ms) | ~2802 | ~2602 |
| Echo time (TE) (ms) | 65 | 65 |
| Bandwidth (kHz) | 42 | 50 |
| Excitations (NEX) | 1 | 1 |
| Echo train length | 96 | 104 |
| Median scan time (min:s) | 4:33 | 5:08 |
5
Pelvic MRI Imaging Dataset for Uterine Pathology
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All women over 18 years of age who underwent pelvic MRI, including sagittal and axial T2-weighted images, in the women’s imaging department of Valenciennes Hospital (France) between September 2021 and March 2022 were retrospectively collected from the Institutional Picture Archiving and Communication System (Electronic Medical Record Entreprise, VEPRO AG, Version 8.2, Pfungstadt, Germany).
Pregnant women were excluded, as were MR images with severe motion artefacts, a highly deviated uterus, and subserous myomatous pathology (FIGO VI and VII, due to important deformation of the uterus).
These examinations were performed using two MR units, either at 1.5 T (SIGNA artist) or 3 T (SIGNA premier) (General Electric Healthcare, Cleveland, OH, USA). The acquisition parameters are listed inTable 1 .
Patients were randomly assigned to training (80%) and validation sets (20%) without any overlap.
An additional set of MR images acquired between July and August 2021 was used for external validation using the same inclusion and exclusion criteria (test set).
Pregnant women were excluded, as were MR images with severe motion artefacts, a highly deviated uterus, and subserous myomatous pathology (FIGO VI and VII, due to important deformation of the uterus).
These examinations were performed using two MR units, either at 1.5 T (SIGNA artist) or 3 T (SIGNA premier) (General Electric Healthcare, Cleveland, OH, USA). The acquisition parameters are listed in
Patients were randomly assigned to training (80%) and validation sets (20%) without any overlap.
An additional set of MR images acquired between July and August 2021 was used for external validation using the same inclusion and exclusion criteria (test set).
6
Liver Imaging Protocols at 1.5T and 3.0T
7
Fabrication and Characterization of T1/PDFF Phantom
8
Multimodal Cardiovascular Evaluation
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The patient underwent a cardiovascular work-up including rest and supine-bicycle exercise echocardiography; 12-lead resting ECG and 24 h Holter evaluation (Cardioline, Italy); biohumoral profile including hs-TnT; and NT-proBNPEchocardiographic evaluation including wall thickness, chamber volumes, and indices of systolic (including 2D and 3D ejection fraction, EF% and Global longitudinal strain, GLS %) and diastolic function assessment [15 (link)].
Cardiac magnetic resonance (1.5 T, Signa Artist, GE Healthcare, Waukesha, WI, USA) was performed to assess biventricular systolic function (steady-state free precession cine sequences) and late enhancement imaging (T1-weighted gradient-echo inversion-recovery sequence acquired 10–20 min after 0.2 mmol/Kg gadoteric acid injection) [16 (link)].
Cardiac magnetic resonance (1.5 T, Signa Artist, GE Healthcare, Waukesha, WI, USA) was performed to assess biventricular systolic function (steady-state free precession cine sequences) and late enhancement imaging (T1-weighted gradient-echo inversion-recovery sequence acquired 10–20 min after 0.2 mmol/Kg gadoteric acid injection) [16 (link)].
9
Diagnosing Metabolic-Associated Fatty Liver Disease
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The radiologists conducting the PDFF and LS measurements were blinded to clinical and biochemical data. All MRI examinations were conducted using the same equipment from GE Healthcare (Signa Artist). Patients were instructed to fast for a minimum of 4 hours before the MRI scan to minimize potential physiological confounding factors. A torso phased-array coil was positioned over the abdomen as the patient lay supine during imaging. Two MRI techniques were used. For MASLD diagnosis, hepatic PDFF or FF was estimated using chemical shiftencoded MRI (Double Dixon technique). Liver fibrosis and LS were estimated using MRE. Significant metabolic dysfunction-associated fibrosis (MAF) was defined as MRE stiffness of 2.97 kPa or higher. 20, 21 MASLD was defined as FF of 5% or higher. 22
10
Isotropic Radial ZTE MRI of Shoulder
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All examinations were performed on the same clinical 1.5 Tesla MRI System (SIGNA™ Artist, GE HealthCare, Waukesha, WI, USA). Patients were scanned in a supine position using a dedicated 16-channel shoulder coil. Coronal 3D isotropic radial ZTE pulse sequence was obtained as part of the institution's standard MR shoulder protocol [19] . Scan parameters are listed in Table 2.
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