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Achieva 3t tx

Manufactured by Philips
Sourced in Netherlands

The Achieva 3T TX is a magnetic resonance imaging (MRI) system manufactured by Philips. It operates at a field strength of 3 Tesla, providing high-resolution imaging capabilities. The core function of the Achieva 3T TX is to acquire detailed images of the human body for diagnostic and research purposes.

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13 protocols using achieva 3t tx

1

Diffusion Tensor Imaging of Learning-Related White Matter Tracts

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DTI was obtained on a Phillips 3T Achieva TX, in an axial orientation in an anterior-posterior phase direction using a single-shot EPI sequence (TR = 7540 and TE = 76, flip angle = 90°, FOV = 240×240 × 132, slice thickness = 2 mm, no gap, 66 slices, acquisition time = 9’31”, voxel size = 1.67 × 1.67 × 2.0) with diffusion weighting in 32 uniformly distributed directions (b = 1,000 s/mm2) and 1 b = 0 s/mm2. Voxel-wise statistical analysis of the FA data was carried out using Tract-Based Spatial Statistics [47 (link)] part of FSL Software 4.0 [48 (link)]. First, each subject' images were concatenated, radiologically oriented, and corrected for eddy current. Then, brain-extraction BET was performed, and all FA images were created by fitting a tensor model to the raw diffusion data using FDT (DTIFIT). All subjects' FA data were then aligned into a common space using the nonlinear registration tool FNIRT. Specific WM tracts have been previously associated with learning and recognition [49–53 (link)]; hence, the selected regions of interests (ROI) FA tracts based on JHU white-matter Tractography atlas (http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Atlases) [54 (link)] were: (1) uncinate fasciculus (UF), (2) posterior cingulate tract (PCT), and (3) anterior cingulate tract (ACT) (see Figure 1).
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2

Comprehensive Cardiac MRI Protocol for Myocardial Infarction Assessment

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All CMR studies were performed with patients under anesthesia, maintained by continuous intravenous infusion of midazolam, in a 3‐T Achieva Tx whole‐body scanner (Philips Healthcare, Best, The Netherlands) equipped with a 32‐element phased‐array cardiac coil. The protocol included (1) a standard segmented cine steady‐state free‐precession sequence to provide high‐quality anatomical references and to determine left ventricular end‐diastolic wall thickness (EDWT), left ventricular end‐diastolic volume (LVEDV), left ventricular end‐systolic volume (LVESV), and left ventricular ejection fraction (LVEF); (2) a late gadolinium‐enhanced sequence to assess infarct size; and (3) a dynamic acquisition with dual‐saturation technique during gadolinium‐based contrast administration to determine absolute myocardial perfusion.23, 24 CMR images were processed with a commercial analysis software (QMass MR 7.5 Medis, Leiden, the Netherlands and MR Extended Work Space 2.6, Philips Healthcare) and were analyzed by 2 independent blinded experienced investigators as previously described.23, 24, 25
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3

Comprehensive Cardiac MRI Evaluation

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MRI was performed on a Philips Achieva 3T TX clinical scanner (Philips Medical Systems, Eindhoven, Netherlands) using the multi-coil receive mode. The protocol included B-TFE, s-TFE-GRID, Q-sFOLW SENSE images, first-pass perfusion module, and delayed enhancement images. Functions of the left and right ventricles were analyzed from short-axis cine images.
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4

Multiparametric Prostate MRI Protocol

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Multiparametric prostate MRIs were acquired with a 3T MRI scanner (Achieva 3 T-Tx, Philips Healthcare) using a 32-channel cardiac coil (Invivo, Philips Healthcare) without endorectal coil. MpMRIs included T1WI, three plane T2WI, DWI MRI with high b value (b1500) and ADC maps, DCE and post-contrast T1WI with fat suppression. Slice thickness and locations were kept constant for axial T2WI, DWI MRI and DCE images without gap. All parameters were compatible with the PI-RADSv2 minimum technical standards (Table 1). For bowel preparation, the Fleet’s™ enema was administered by the patients themselves approximately 12 h before mpMRI.
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5

Multiparametric MRI Protocol for Prostate Cancer

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The mpMRI data were acquired on Philips Achieva 3T-TX scanner (Philips Healthcare, Netherlands) using a 6-channel cardiac phased array coil placed around the pelvis, combined with an endorectal coil (Medrad, Bayer Healthcare, USA). After T2W imaging and DWI, baseline T1 mapping was performed using a variable flip angle (VFA) sequence (TR/TE = 12/2.3 ms, field of view (FOV) = 385×250 mm, matrix size = 308×220, flip angle = 3°, 5°, 10°, 15°, 20°, 30°, slice thickness = 3.5 mm, number of slices = 24, SENSE factor = 1.67, half scan factor = 0.675). Subsequently, DCE data using 3D T1-FFE mDIXON sequence were acquired pre- and post-contrast media injection 0.1 mmol/kg of Multihance (TR/TE1/TE2 = 4.6/1.7/3.3 ms, FOV = 250×385 mm2, matrix size = 200×308, flip angle = 10°, slice thickness = 3.5 mm, number of slices = 24, SENSE factor = 1.67, half scan factor = 0.675) for 60 dynamic scans with temporal resolution of 8.3 s/image.
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6

High-Resolution Structural Brain Imaging

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An MRI scanner Philips Achieva 3 T TX was used for the acquisitions. T1‐weighted images were obtained in a sagittal orientation. Repetition time (TR) = 7.4 ms, echo time (TE) = 3.4 ms, matrix size 228 × 218 mm2; flip angle 9°, field of view (FOV) = 250 mm, slice thickness 1.1 mm, acquisition time = 4′55″, 300 slices, voxel size 0.98 × 0.98 × 0.60 mm3.
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7

Multiparametric MRI for Prostate Cancer

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MR images were acquired with a 3-T system (Achieva 3 T-TX, Philips Healthcare) and the combination of the anterior half of a 32-channel cardiac sensitivity-encoding coil (Invivo, Philips Healthcare) and an endorectal coil (BPX-30, Medrad) filled with 45 mL of perfluorocarbon-based fluid (Fluorinert, 3M). The mpMRI protocol included T2-weighted imaging (axial, coronal, sagittal), DWI (b = 2000 s/mm2), and dynamic contrast-enhanced MRI. DW images consisted of a high-b-value (2000 s/mm2) sequence and ADC map (from five evenly spaced b values of 0–750 s/mm2), which was the main sequence used for analysis. ADC maps were automatically calculated by the MRI unit software by means of a mono-exponential decay model fitted to data from images obtained at the five evenly spaced b values. The following model equation was used: S(b) = S(0) × exp(−b × ADC), where b is the gradient created by any one of the five b values used. The full mpMRI acquisition parameters are shown in Table 2.
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8

Sedated Brain MRI Protocol

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Patients underwent sedation prior to MRI using a 5% chloral hydrate (50 mg/kg) enema administered by an anesthesiologist 30 minutes prior to the study and were monitored by the clinically responsible physician throughout the examination. All examinations were performed on a Philips 3.0 Tesla (3 T) MRI system with pencil beam (pencil beam is a kind of B0 shimming method through a pencil beam volume shimming algorithm) and second-order shimming (Achieva 3T TX; Philips Healthcare Systems, Best, Netherlands), using a body coil for transmission and an eight-channel sensitivity-encoding (SENSE) receiver coil. Each examination was interpreted separately by two experienced radiologists.
The conventional brain MRI examination included T1WI, T2WI, and DWI sequences. A fast-field echo (FFE) sequence was performed for T1WI using the following parameters: TR of 200 ms; TE of 2.3 ms; FOV of 180 × 161 mm2; matrix of 224 × 162; slice thickness of 5 mm. Parameters for the turbo spin-echo (TSE) sequence used for T2WI were as follows: TR of 4.6 ms; TE of 200 ms; FOV of 180 × 155 mm2; matrix of 224 × 162; slice thickness of 5 mm. Parameters for the spin-echo (SE) sequence used for DWI were as follows: TR of 2500 ms; TE of shortest time; FOV of 200 × 200 mm2; matrix of 124 × 124; slice thickness of 5 mm.
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9

Optimized MRI Protocol for Pediatric Abdominal Imaging

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The examinations were performed with a Philips Achieva 3T TX magnetic resonance scanner (Philips Healthcare; Best, The Netherlands) incorporating a 16-channel dedicated abdominal coil. MR protocol included the following sequences: T2W_TSE_Tra_HR; STIR_Tra_FB; VISTA_COR_Sense; mDixon_Tra;DWI_5b_Tra_navi; sMRCP_3D_HR_COR; e-THRIVE_COR_FB; mDixon_Tra C+.
The dynamic sequence of choice was 3-D thrive (Enhanced T1 High-Resolution Isotropic Volume Excitation). This sequence was optimized (regarding the field of view (FOV) and number of slices) for each patient to improve spatial and temporal resolution.
The time of examination was up to 40 min (depending on patient breathing frequency with breathing triggering option), including a dynamic sequence, which took 15 min on average. All children received intravenous infusion of at least 10 ml of normal saline per kg of body weight 1 h before the study.
The diuretic (Furosemidum Polpharma, Polpharma SA) at the dose of 0.25–0.5 mg/kg up to 15 mg was administered 15 min before contrast injection.
Children younger than 5 years old were examined under general anesthesia.
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10

Cardiac MRI Perfusion Imaging Protocol

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Subjects were scanned in supine position on a 3T MRI scanner (Achieva 3T-TX, Philips Healthcare, Best, Netherlands) equipped with a Quasar Dual gradient system (60 mT/m; 200 mT/m/ms) and dual-source parallel RF transmission (MultiTransmit) technology [7 (link)]. A 6-channel cardiac phased array receiver coil, 4-lead vectorcardiogram, respiratory belt and blood pressure monitoring were used. For each perfusion scan, an intravenous bolus of 0.075 mmol/kg gadobutrol (Gadovist, Bayer, Germany) was administered followed by a 20 ml saline flush (Spectris Solaris power injector, Pittsburgh, Pennsylvania, USA).
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