Table 4.

Procedure Description Attributes Having Clinical Relevance in Obstetric Ultrasonography for Evaluation of Fetal Cranial Abnormality

Procedure Attribute	Examples
Imaging modality	Two-dimensional ultrasonography, color Doppler
Probe location	Suprapubic, subxiphoid, intravaginal
Beam path	Transabdominal, transvesical
View/orientation	Longitudinal, transaxial
Region of interest	Lateral ventricle (of fetus), fourth ventricle (of fetus)
Functional context	Maternal bladder full, maternal bladder empty
Equipment	Vendor identifier, model number, software revision
Transducer	Probe type, probe frequency