Objective image noise assessment at the 8 assessed levels: right supraspinatus muscle at the level of the glenoid (level 1), erector spinae at the level of the carina (level 2), liver at diaphragm (level 3), liver at porta hepatis (level 4), right renal cortex at the renal hilum (level 5), erector spinae at level of the right kidney lower pole (level 6), psoas muscle at the iliac crest (level 7) and gluteus maximus at the level of the acetabular roof (level 8).