Patients were scanned from the aortic arch to the white matter using GE Lightspeed VCT 64-slice spiral CT. Prospective ECG gating techniques were used, and scan parameters were as follows: 120 kV of tube voltage, 50 mA of tube current, 0.4 seconds of gantry rotation time, 0.75 mm of reconstruction thickness, 0.75 mm of slice gap, 512×512 of matrix size, 250–300 mm of the field of view. Scanning time ranged from 8 to 10 seconds and ensured that the intake scanning will be completed during one breath-hold. All image acquisition and processing was performed at GE ADW 4.3 WorkStation; the analysis software is Smart Score 3.5. Areas larger than 0.5 mm2 of higher CT value than the threshold value set as 90 HU, were identified as calcified lesion. Image window width was set to 600–1,000 H, and the window level was set to 150–400 H. Artery calcification regions from the common carotid artery to the skull of the internal carotid artery were treated together and CS value was calculated.9 Patients were divided into three groups according to CS values1 (link): mild CS group: CS value <300;2 (link) moderate CS group: CS value between 300 and 500;3 (link) severe CS group: CS value >500.
Lightspeed vct 64 slice spiral ct
Manufactured by GE Healthcare
Sourced in United States
The Lightspeed VCT 64-slice spiral CT is a computed tomography (CT) scanner developed by GE Healthcare. It is designed to capture high-resolution, three-dimensional images of the body using a spiral or helical scanning technique. The device is equipped with 64 detector rows, enabling it to acquire multiple slices of data simultaneously during a single rotation around the patient.
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3 protocols using lightspeed vct 64 slice spiral ct
1
Quantifying Carotid Artery Calcification from CT Scans
2
Pediatric Abdominal CT Imaging Protocol
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All CT scans were acquired during a single breath-hold in cooperative children or during quiet respiration in children unable to suspend respiration, and those who could not cooperate were sedate by oral administration of 10% chloral hydrate (0.5 ml/kg, body weight) before examination. All abdominal three-phase CT scans, including non-enhanced phase (NP), arterial phase (AP), and venous phase (VP), were performed on Lightspeed VCT 64-slice spiral CT (GE Healthcare, USA) scanner or Brilliance ICT 256-slice spiral CT (Philips, Netherlands) scanner. The CT scanning parameters were (1) tube voltage: 120 kV; (2) tube current: 200 mAs; (3) pitch: 0.984:1; (4) slice thickness: 5.0 mm; (5) slice interval: 5.0 mm; (6) reconstructed slice thickness: 1.25 mm. Nonionic iodinated contrast material (Omnipaque 300 mg I/mL or Visipaque 320 mg I/ml, GE Healthcare) was used. Contrast material (2 ml/kg, body weight) was injected into peripheral vein of the forearm with a power injector at a rate of 1–3 ml/s. AP and VP of post-contrast scanning were performed at 20–35 and 60–70 s respectively after contrast material administration.
3
Pediatric CT Contrast Protocol
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Before the CT examination, the guardians of the patients provided informed consent for the potential adverse reactions to contrast medium and exposure to radiation. The images were acquired with Lightspeed VCT 64-slice spiral CT (GE Healthcare, USA) and Brilliance ICT 256-slice spiral CT (Philips, Netherlands) by using the following parameters: tube voltage, 90–120 kV; automatic tube current, 60–100 mAs; pitch, 0.984; slice thickness, 5.0 mm; and slice interval, 5.0 mm. The patients were scanned in the supine position from the neck to the diaphragm. A contrast agent (Omnipaque, GE Healthcare, USA) was injected during the scan into the scalp vein or elbow vein of the patient at 300–350 mg/ml at 2–5 ml/s, dosage of 2.0 ml/kg. The children under 5 years old were sedated with contrast agent (0.5 ml/kg). The post-processing methods in the CT scanner included multiplanar reconstruction and three-dimensional volume rendering. All images were reconstructed with 1.25 mm slice thickness with a 0.625 mm slice interval. Multi-directional and multi-angle reconstruction images were used to evaluate the heart structure and origin of the blood vessels.
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