2D and B-mode

Two dimensional (2D) and B-mode refer to a moving clip created by scan lines sequentially sent through a field at a frame rate. It is the most common mode of imaging, and is excellent for global assessments of structure and function.


  • Select 2D or B-mode
  • Adjust the time for longer clips
  • 5 heart beats or 3-5 seconds
  • Allows better assessment of function
  • Save clips
  • Needed for quality improvement, teaching, and billing

2D Caliper

Measurements and assessments

  • Calpier is a tool for measuring structures
  • Left ventricular outflow tract diameter
  • IVC diameter and diameter change
  • Optic nerve sheath diameter

Obtaining measurement

  • Image area of interest in 2D
  • Use active zoom if available
  • Save video clip
  • Freeze image
  • Measure edge to edge (Figure 1)
  • Save measurement


Most systems will have an auto-optimize button (different names depending on the manufacturer)


Figure 1 - 2D Caliper


Chan, Vincent, and Anahi Perlas. “Basics of ultrasound imaging.” Atlas of ultrasound-guided procedures in interventional pain management. Springer, New York, NY, 2011. 13-19.