The five most common modes used during TEE examinations are 2D gray-scale imaging, color Doppler, pulsed-wave (PW) Doppler, continuous-wave (CW) Doppler, and three-dimensional (3D) imaging. The usual buttons to enable these modes are 2D, Color, PW, CW, and 3D. Other scanning modes, such as M-mode and angio, are often available but are minimally important in comparison. Figure 2–1 is an example of four common ultrasound control panels. While the number and layout of buttons and controls are different, there are many similarities. This chapter focuses on controls that affect 2D imaging, color Doppler, pulsed-wave Doppler, and continuous-wave Doppler. Three-dimensional imaging is a new and exciting addition to TEE, especially for the evaluation of the mitral valve, and will be briefly discussed at the end of this chapter.