The specimens were defrosted for 72 h and removed from their bags prior to scanning (Figure 1 ) at a clinical imaging facility (Castlereagh Imaging, Cremorne, Sydney, Australia). MRI sequences were obtained from a Philips Ingenia 3.0T scanner (Philips Medical Systems, Amsterdam, Netherlands). The scanning protocol included two sequences: (1) a three-dimensional proton-density high resolution sequence (TR—1000 ms, TE—37.7 ms, in-plane resolution of 1024 × 1024 pixels, 0.52 mm slice thickness and 0.26 mm spacing; and (2) a two-dimensional proton-density sequence captured in the coronal plane to the thigh segment (TR—2955 ms, TE—30 ms, in-plane resolution 960 × 960, 2.5 mm slice thickness and 2.75 mm slice spacing. In addition, CT sequences were obtained from a GE Medical Systems LightSpeed VCT scanner (LightSpeed VCT, GE Healthcare, Chicago, IL, USA) with 512 × 512 resolution, 0.63 mm slice thickness, 0.3 mm slice spacing and 120 pkV.
Lightspeed vct scanner
Manufactured by GE Healthcare
Sourced in United States
The Lightspeed VCT scanner is a computed tomography (CT) imaging system designed by GE Healthcare. It is capable of performing volumetric imaging to capture high-resolution, three-dimensional images of the body. The Lightspeed VCT scanner utilizes advanced technology to collect and process data, enabling rapid image acquisition and reconstruction.
Automatically generated - may contain errors
Lab products found in correlation
Somatom definition flash, by Siemens (2 mentions)
Somatom definition as, by Siemens (2 mentions)
Somatom definition, by Siemens (2 mentions)
Ingenia 3.0t scanner, by Philips (1 mentions)
Lightspeed plus, by GE Healthcare (1 mentions)
Lightspeed 16, by GE Healthcare (1 mentions)
Care dose 4d, by Siemens (1 mentions)
Sensation 16, by Siemens (1 mentions)
Brilliance ict, by Philips (1 mentions)
Somatom definition flash ct scanner, by Siemens (1 mentions)
Aquilion one scanner, by Canon (1 mentions)
Aquilion prime scanner, by Canon (1 mentions)
Ultravist 370, by Bayer (1 mentions)
Iomeron 300 mg ml, by Bracco (1 mentions)
24 protocols using lightspeed vct scanner
1
Multimodal Imaging of Biological Specimens
2
Cerebral Perfusion Imaging Protocol
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A General Electric LightSpeed VCT scanner was used for evaluation of all qualified patients by CTP. The mean time interval from CTP scanning to DSA assessments was 3±1 days. Two independent neuroradiologists jointly analysed the CTP data using Neuro CT aw4.7 software (Siemens Medical System) on a Siemens Medical System workstation. Regions of interest (ROIs) in brain were marked with a circle of 32–42 mm2. Vertebral artery (ROI 1) and superior saggital sinus (ROI 2) were set as input artery and output vein respectively. Data and images of cerebral blood volume (CBV) and CBF, mean transit time (MTT) and time-to-peak (TTP) were gathered. In cerebellum reference (ROI 3) was selected at the level of dentate nucleus. The CTP image data sets were displayed side by side, and ROIs were drawn at corresponding positions in both images.16 (link)
3
Metallic Artifact Simulation in CT
4
Abdominal Adipose Tissue Quantification by CT
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were assessed by computed tomography (CT) by a trained technician using a General Electric Lightspeed VCT scanner (General Electric Medical Systems, Milwaukee, WI), with the participant in the supine position and arms folded across her chest. Following a scout view, a single 10-mm thick image of the abdomen at the L4-L5 vertebral space was obtained. Images were read by a single trained radiologist blind to the participant's characteristics, at the reading center at the University of Colorado Anschutz Medical Campus, using software developed by the center (RSI Inc., Boulder, CO) and used in large cohort studies (30 (link),31 (link)). Total abdominal adipose tissue area (TAT) was defined within this planimetric area using fat attenuation range between 1190 and 130 Hounsfeld Units (32 (link)). The manual segmentation method was used to define VAT area delineating the area within the muscle wall surrounding the abdominal cavity (30 (link)). VAT was subtracted from TAT to quantify SAT.
5
3D Pelvic Model Reconstruction from CT Scans
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Patient CT scans (acquired using 64-slice GE LightSpeed VCT Scanner, GE Healthcare, Chicago, IL, USA) required for reconstruction of 3D pelvis models were obtained from the hospital imaging server (Merge PACS™, Merge Healthcare, Chicago, IL, USA). Axial images of the full pelvic region from the ilium to the subtrochanteric region were acquired, preferably in Digital Imaging and Communications in Medicine, or DICOM (DCM) format but Bitmap (BMP) format was also compatible. Axial images were acquired at the lowest possible scan thickness (i.e. 0.625 mm) to construct the highest resolution 3D pelvic models.
6
Spiral CT Scan for Colon Distension
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A spiral CT scan of the patient’s abdomen was performed after the entire colon was distended with room air and tagging agent used beforehand (200 ml Telebrix 1-day preparation) [8 (link)]. Prone and supine position helical CT scans were performed, 30 s following intravenous contrast administration. The slice thickness of volume data were reconstructed to 1.25 mm. All scans were performed using a 64-slice GE Lightspeed VCT scanner (GE HealthCare, Milwaukee, Wisconsin, USA).
7
Quantifying Brain Edema Using CT Scans
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Brain CT scans were obtained on a 64-channel scanner (Light Speed VCT scanner; GE Healthcare, Milwaukee, Wisconsin, USA) with 5 mm slices. The GWR was calculated by a blinded investigator as previously reported [21 (link)]. Briefly, Hounsfield units (HU) were recorded in the caudate nucleus, putamen, genu of corpus callosum, and posterior limb of the internal capsule at the basal ganglia level, as well as the medial cortex and medial white matter at the cerebrum and high convexity area. The average gray matter to white matter ratio (aGWR), which was defined as the mean of the basal ganglia GWR and cerebrum GWR, was used in the current analysis. Patients were divided into three groups according to their aGWR: severe edema (aGWR < 1.1), mild edema (aGWR 1.1–1.2) and no edema (aGWR ≥ 1.2).
8
CT Imaging Protocol for Long-term Follow-up
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Various CT units were used over the >10-year follow-up period: a Sensation 16, SOMATOM Definition, SOMATOM Definition flash, SOMATOM Definition AS+ scanner (all manufactured by Siemens Medical Systems, Erlangen, Germany), LightSpeed 16, LightSpeed Plus, or LightSpeed VCT scanner (manufactured by GE Healthcare, Milwaukee, WI). The scanning parameters were as follows: beam collimation, 16 x 0.75 mm, 32 x 0.6 mm, or 64 x 0.6 mm; beam pitch, 0.984:1; gantry rotation time, 0.5 seconds; field of view to fit; 120 kVp. An automated dose reduction system was used (CARE Dose 4D, Siemens Medical Solutions; Auto mA/ Smart mA, GE Healthcare) with the maximum allowable tube current set at 100–400 mAs. Three- or five-mm-thick images at 3-mm/5-mm intervals without gaps were reconstructed in the axial planes. Coronal reformations have been routinely performed at a slice thickness of 5 mm for all CT scans since 2008. For contrast enhancement, intravenous contrast medium (100 cc of 300 mgI/mL nonionic contrast) was administered at a rate of 2–3 mL/seconds using an automatic power injector.
9
HRCT Imaging Protocol for COVID-19 Pneumonia
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HRCT images were collected in the Department of Radiology, Jingmen No.1 People’s Hospital, Hubei Province. A GE MEDICAL SYSTEMS LightSpeed VCT scanner was used. All patients were supine, and the images were captured after the patients were instructed to hold his (her) breath. The following scanning parameters were employed: slice thickness, 1.25 mm; field of view (FOV), 354.0 mm; tube voltage, 120 kV; tube current, 278 mA; and image zoom, 1.00. The AI analysis software used for image processing was a deep learning system developed by Shanghai United Imaging Intelligence Co., Ltd. and Shanghai Public Health Clinical Center, Fudan University (New Coronavirus Pneumonia Auxiliary Analysis Software, version number: Full-uAI-Discover-NCP.R001.0.0.15980) [11 ]. The lung window (with window width 1200 HU and window level − 600 HU) was used for image reading.
10
Multi-phase CT Protocol for Abdomen
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CT examinations were performed on a multidetector-row CT scanner (Siemens SOMATOM Definition, Siemens Healthcare, City, Germany) in Hospital 1 and on a 256-slice CT scanner (Brilliance iCT, Philips Medical Systems, The Netherlands) and a Lightspeed VCT scanner (GE Healthcare, Chicago, IL) in Hospital 2. The CT parameters were as follows: tube voltage = 120 kV, tube current =150–230 mA, 512 × 512 matrix, tube rotation time = 0.5–0.8 s, field of view of 350 × 350 mm, pitch = 0.6, section thickness = 5 mm, and 1 mm reconstruction interval. Before the CT examination, the patients were required to fast for 6–8 h. Water (500–1000 ml) was orally administered for 5 min before the scan. Subsequently, 80–100 ml non-ionic iodinated contrast medium (350 or 370 mg I/ml) was injected through the median cubital vein using a double-barbed high-pressure syringe at flow rates of 3.0–3.5 ml/s. The arterial, portal, and delayed phases were performed at 25–30, 60–65, and 120–140 s after contrast injection, respectively.
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