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3D & 4D Ultrasound Mastery

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Spatiotemporal Image Correlation (STIC)

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1. How does STIC differ from standard 3D ultrasound?
Adds Doppler colour overlay to acquired 3D volumes during playback Analyses 3D images in both spatial and temporal domains Replaces 2D greyscale scanning in routine obstetric assessments Applies inversion rendering to fluid-filled structures only
2. What is the first step in acquiring a STIC dataset?
Manually tracing cardiac boundaries across multiple rotational planes Performing an automatic volume sweep to capture sequential 3D images Applying surface rendering to a pre-acquired static 3D volume Gating image acquisition to an external fetal ECG signal
3. After the automatic sweep, what does STIC's processing allow the examiner to visualise?
A static 3D surface render of the fetal heart at end-diastole only The fetal heart at various stages of its cardiac cycle Real-time Doppler flow within all four cardiac chambers simultaneously A maximum-mode projection of all ossified cardiac structures
4. Which fetal structure is the most common primary target of STIC imaging?
Fetal brain — for cortical sulcation and ventricular assessment Fetal spine — for vertebral segmentation and neural tube defects Fetal heart — for cardiac anatomy and cycle assessment Placenta — for volume quantification and infarct mapping
5. STIC's 4D cardiac images can be displayed in which multiplanar views?
Coronal, sagittal, and transverse planes of the placental bed Four-chamber and five-chamber views for comprehensive cardiac assessment TCD, BPD, and transcerebellar planes for biometric measurement Longitudinal and transverse planes of the umbilical cord only
6. What does surface rendering add to STIC's diagnostic capability?
It extracts Doppler flow velocity data from cardiac chamber walls It provides an intuitive 3D view of the heart's shape and position It traces cardiac boundaries to compute precise ventricular volumes It applies inversion mode to highlight fluid within cardiac chambers
7. Which cardiac abnormalities can STIC help detect?
Neural tube defects and posterior fossa anomalies only Congenital heart defects Placental abruption and cord insertion anomalies only Renal agenesis and diaphragmatic hernia only
8. Which best summarises STIC's complete analytical capability?
Static volume acquisition, greyscale enhancement, and inversion rendering Dynamic 3D reconstruction, multiplanar, surface rendering & temporal correlation 2D frame averaging, colour Doppler overlay, and automated biometry Volume inversion, organ tracing, and VOCAL-based volumetry