Table 1.

Characteristics of cases in the CT validation study

Case	GA (wk)	Diagnosis	CT volume (ml)	3D US volume (ml)
1	18+3	Anencephaly	0.29	0.39
2	19+3	Trisomy 21	0.41	0.31
3	21+2	Trisomy 18	0.37	0.40
4	22+6	Trisomy 21	0.88	0.79
5	24+0	Trisomy 13	1.18	1.29
6	28+6	Severe brain abnormality	2.33	2.36

GA, Gestational age at termination; 3D US, 3D ultrasound.