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3D & 4D Ultrasound Mastery

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Special Volume Imaging Modalities

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1. What distinguishes Special Volume Imaging Modalities from standard 3D/4D?
Available only in first trimester; standard 3D/4D is third-trimester only They add functional or analytical layers to enhance volumetric data They replace 2D greyscale in all routine obstetric examinations Available only on research-grade machines, not on clinical platforms
2. What is the defining technical feature of STIC?
Applies inversion to fluid structures to improve 3D surface contrast Synchronises volume frames over time to reconstruct a dynamic cardiac cycle Divides a 3D volume into parallel 2D slices displayed simultaneously Traces structural outlines across planes to compute organ volume
3. What is the primary clinical application of STIC?
Fetal organ volumetry — liver and spleen volume quantification Amniotic fluid volume assessment and placental surface mapping Fetal cardiac anatomy and congenital heart defect detection Cervical length and lower uterine segment evaluation
4. Inversion Mode enhances which type of structures specifically?
Echogenic structures — ossified bone and calcified tissue deposits Solid soft-tissue structures — liver, kidney cortex, and placenta Fluid-filled structures — converting them to echogenic for clearer outline Vascular structures — replacing colour Doppler for flow visualisation
5. VCI (Omni-View) improves 3D image quality by doing what?
Tracing organ boundaries across planes to compute enclosed volume Synchronising temporal frames to reconstruct a dynamic cardiac loop Averaging a voxel slab — increasing contrast and reducing noise Inverting greyscale values to convert anechoic structures to echogenic
6. TUI (Multi-Slice Imaging) displays volumetric data in what format?
A single surface rendering with adjustable transparency and lighting A dynamic animated loop rotating through multiple spatial axes Multiple parallel 2D slices at defined intervals in a grid format An inverted greyscale rendering converting fluid structures to echogenic
7. What is B-flow's principal advantage over conventional colour Doppler?
Inverts vessel wall rendering to improve echogenicity against tissue Displays blood flow without colour overlay, preserving greyscale detail Traces vascular boundaries across planes to compute vessel volume Reconstructs vascular anatomy from temporally gated acquisitions
8. VOCAL is specifically designed to perform which function?
Reconstructs a cardiac cycle from temporally gated volume sweeps Displays a 3D volume as simultaneous parallel 2D slices on screen Calculates precise 3D organ volume through multiplanar boundary tracing Enhances fluid structure contrast by inverting greyscale rendering