Emotion 16 slice

All of the patients underwent a non-contrast CT scanning with a routine protocol for renal calculus (64 × 0.625 mm collimation) on the CT machine (Siemens Emotion 16 slice, Germany). The CT parameters included 5 mm collimation, 120 kV, 200 mAs, and reconstruction at 3-mm intervals. The patients were advised to drink about 1 L of water about 60 min before examination. The images were investigated in the station [Figure 2]. All of the patients were examined by a radiologist who was familiar with renal ultrasound and urinary tract but was not aware of the study. Once the stone detection was confirmed, the size and location of the stones were reported, and the Hasfield number was calculated.

The thoracic CT scans were performed using a 16-detector multi-sectional CT scanner (Somatom Emotion 16-slice; CT2012E-Siemens AG, Berlin and München, Germany) with intravenously injected contrast agent while the patients held their breath. Contrast-enhanced images were obtained 50–70 sec after the IV administration of 120 ml of the ionic iodinated contrast agent iodixanol (Visipaque 320 mg/100 ml, Opakim) using a power injector at a rate of 2 ml/sec.
The following parameters were used: 120–130 Kilovolt (kV), 80–120 (effective mA), 0.6 sec (rotation time), 16 mm×1.2 mm (acquisition), 1.2 mm (slice collimation), 5.0–3.0 (slice width), 0.80 (pitch factor), 5.0 mm (increment), and 512×512 (matrix).