Figure 1
From: Central venous pressure estimation with force-coupled ultrasound of the internal jugular vein
(A) Force-coupled ultrasound data collection block diagram. (B) CAD diagram of force-coupled ultrasound probe longitudinal cross-section. The force transmission is shown in green from the imaging surface of the ultrasound probe to the clamp connection to the load cell. (C) Picture of handheld probe with ultrasound gel on it. (D) Force and optical flow overlay pre-synchronization. Force is in blue while optical flow is in orange. Synchronization-relevant peaks are marked. (E) Force and optical flow overlay post-synchronization. Force is in blue while optical flow is in orange. Synchronization-relevant peaks are marked. (F) IJV detection with seed point indicated by blue asterisk in subject 2. (G) Segmentation of an open IJV with all intermediate steps included in subject 2. The pink indicates the first stage region growing output. The green asterisks represent the second stage radial line intensity gradient maximization output. The red circles represent the third stage intensity gradient and shape optimization. The blue tracing represents the final 2000-point interpolation stage.
