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Table 2 Comparisons of Imaging Technologies

From: Fetal membrane imaging and the prediction of preterm birth: a systematic review, current issues, and future directions

  Definition Resolution Previous Studies of fetal membranes
Transabdominal ultrasound Ultrasound waves 1 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