B-Flow imaging of the placenta: A feasibility study.

Area of Science:

• Medical Imaging
• Obstetrics
• Ultrasound Technology

Background:

• B-Flow imaging visualizes intravascular echoes in real-time gray-scale ultrasound, distinct from Doppler techniques.
• Assessing placental vasculature is critical for monitoring fetal well-being.
• Existing ultrasound methods may have limitations in visualizing fine placental vessels.

Purpose of the Study:

• To evaluate the feasibility of B-Flow imaging for placental visualization.
• To identify and characterize artifacts associated with B-Flow imaging in the placenta.
• To compare the vessel visualization capabilities of B-Flow imaging against color Doppler.

Main Methods:

• 36 pregnant women (17 normal, 19 high-risk) were enrolled after IRB approval.
• B-Flow and cine capture ultrasound images were acquired using a GE LOGIQ E9 system.
• Retrospective analysis of images was conducted by researchers and blinded reviewers to assess artifacts and visualized vessels.

Main Results:

• Out of 161 reviewed B-Flow images, only 15 were artifact-free; the majority contained some artifacts.
• B-Flow imaging identified significantly more small horizontal and vertical running vessels compared to color Doppler (p=0.046 and p<0.001, respectively).
• Two independent blinded reviewers analyzed 144 reads from 36 women, comparing B-Flow and color Doppler.

Conclusions:

• B-Flow imaging demonstrates potential for visualizing perfusion within the human placenta.
• Effective utilization of B-Flow imaging necessitates careful recognition and mitigation of image artifacts.
• Further refinement of image acquisition techniques is required to optimize B-Flow imaging for placental assessment.