Table 2 Comparisons of Imaging Technologies
| Â | Definition | Resolution | Previous Studies of fetal membranes |
|---|---|---|---|
Transabdominal ultrasound | Ultrasound waves | 1Â mm | Described in text |
Transvaginal ultrasound | Ultrasound waves | 0.5–1.0 mm | None |
MRI (Fusion Imaging) | Real time MRI and Ultrasound synchronized | 1.08–1.6 mm | None |
Optical Coherence Tomography (OCT) | Near infrared light for real time high resolution cross sectional image of microstructure | 1–10 μm | Yes, fetal membranes thicker in full term birth without PROM compared to full term birth with PROM and preterm birth without PROM |
Shear Wave Elastography (SWE) | Acoustic radiation that causes displacement, which is used to measure tissue stiffness | 10–20 mm | None |
Magnetic Resonance Elastography (MRE) | Similar as above using MRI | 1.08–1.6 mm | None |
Optical Coherence Elastography (photoacoustic technology) | Similar as above using OCT | 1–10 μm with displacement measured up to 20 μm | None |