Brilliance 64 slice spiral ct

The examination equipment included the Brilliance 64-slice spiral CT and the Brilliance 256-slice spiral CT scanners (Philips Healthcare), and the SOMATOM Definition dual-source CT scanner (Siemens Healthineers). The CT scanning range was from the diaphragm dome to the lower margin of the pubic symphysis and the scanning direction was from the cranial to caudal. The patients were required to hold their breath during the CT. The scanning parameters of the Philips’ CT scanners were 64 × 0.625 mm collimation, 250 mm field of view (FOV), 120 kV tube voltage, 250 mA tube current, 5 mm slice thickness, 5 mm slice interval, 0.4 s tube rotation time, 0.891 pitch, standard (B) algorithm, and 512 × 512 matrix. The scanning parameters of the Siemens’ CT scanner were 128 × 0.6 mm collimation, 50 min FOV, 120 kV tube voltage, 200 mA tube current, 0.5 s tube rotation time, 0.6 pitch, standard (B) algorithm, and 512 × 512 matrix. A high-pressure syringe was used to inject 70–100 mL of contrast agent into the patient’s antecubital vein at a flow rate of 2.5–3.5 mL/s. A plain scan, arterial phase scan at 25–30 s after contrast agent injection, and venous phase scan at 55–60 s after contrast agent injection were performed.