Table 2.

New and Advanced Features of Fetal Intelligent Navigation Echocardiography (FINE) Method

Category	Feature	Purpose
Simplify FINE method	1. Auto Fetal Positioning (or FINE Align)	• Automatically reorients and standardizes the STIC volume dataset so that fetal spine is consistently placed at 6 o’clock position • Realigns STIC volume dataset to correct a fetal drifting spine
	2. Skip Points and Predictive Cursor	• Simplifies the marking process of anatomical structures via Anatomic Box® by automatically placing cursor near or at the location to be marked • Can choose to rely on predictive cursor placement and “skip points” (vs. intentionally marking anatomical structures as before)
	3. Static Mode Volume	• Three-dimensional static volume obtained via a very rapid acquisition time (i.e. 1 second) and is characterized by a high frame rate    ○ Resulting nine echocardiography views are static and without motion
	4. Breech Sweep	• Activated for breech presentations only • Motor array within volumetric transducer switches directions and automatically sweeps over fetal ROI so that fetal upper mediastinum is seen at the start of sweep, and stomach at end of sweep
Quantitative cardiac measurements	5. Automatic Cardiac Axis	• Fetal cardiac axis calculated and depicted automatically in the four-chamber view diagnostic plane • Measures the angle formed between ventricular septum and a line drawn between crux and cross-section of aorta in four-chamber view (i.e. Ao-crux-apex)
	6. Cardiac Biometry	• Measurements obtained via electronic calipers (i.e. distance, elliptical circumference) applied to cardiac diagnostic planes
Improve success of obtaining fetal echocardiography views	7. Maestro Planar Navigation	• Fine-tune navigation of a single cardiac diagnostic plane at a time (without affecting the other eight diagnostic planes)    ○ Parallel shift; x, y, z rotations • No multiplanar display or reference dot tool depicted

ROI, region of interest; STIC, spatiotemporal image correlation