Fig. 7.

A 29-year-old female patient (BMI = 20.8) with haematuria. a and b Axial conventional dose (3.6-mSv) 5-mm non-contrast CT images reconstructed with 40 % ASiR (a) and 100 % FBP (b) showing a 5.4-cm low-density left adnexal mass consistent with a dermoid cyst (arrow). This left adnexal mass was missed when viewed on the low-dose non-contrast CT images. c-f Axial low-dose (0.48-mSv) 5-mm non-contrast CT images reconstructed with 100 % FBP (c), 40 % ASiR (d), 70 % ASiR (e) and 90 % ASiR (f) showing the inferior detail of the left adnexal lesion relative to the conventional dose images (arrow). Again note the ‘over smoothening’ of the soft tissues on the 90 % ASiR image compared to the other low-dose reconstructions