Ge revolution hd

Paraspinal CT measurements for each older adult undergoing treatment were obtained from their medical records from routine non-contrast CT of the chest. We used axial images localized to the twelfth thoracic vertebrae (T12) in CT image analyses in Osirix MD (Pixmeo, Bernex, Switzerland). We placed 2 cm² ovoid ROIs in the erector spinae muscles bilaterally and the Hounsfield units (HU) were averaged to obtain erector spinae HU (see Figure 1). If the available erector spinae areas were <2 cm², the largest available region of interest was used. Eight CT scans were non-contrast, and two had early arterial phase contrast. CT scanners used were GE Revolution HD (n = 4), GE Revolution EVO (n = 3), and GE Optima (n = 3) (GE Healthcare, Madison, WI) and all but 1 scan was conducted at the University of Wisconsin Health Hospital in Madison, WI.

All CTA scans were performed with a 64-slice spiral CT machine (GE Revolution HD, GE Healthcare, Milwaukee, USA or Somatom Definition AS+, Siemens Healthineers, Erlangen, Germany) using an automatic trigger system during the arterial and venous phases using 120 kV, 190 mAs, a collimation of 64 × 0.6 mm, a rotation time of 0.38 s. All CT scans were performed from the thoracic inlet to the level of the bifurcation of the common iliac arteries in the cranio-caudal direction, with a slice thickness of 0.625 mm and an interslice gap of 0.625 mm. Iopromide ([Ultravist® 370] Schering Pharmaceutical, Guangzhou, China), the contrast agent, was intravenously injected (concentration: 370mgI/ml, 1-2mL/kg, 4–5ml/s). When the attenuation trigger value reached a threshold of 120 Hounsfield units, a region of interest was drawn in the descending aorta, and automatic bolus tracking was done to trigger the scan.