Appendix D  On-screen Controls 
D - 12  Instructions for Use 
2D-Mode Parameter Selections 
Selection  Description 
Trapezoid  Trapezoid/Linear 
Enables linear or trapezoid image format for linear transducers. 
  On displays a trapezoid image. 
  Off displays a linear image. 
Note: For systems without a touch screen, the selection is assigned to a soft key. 
Space Time  Adjusts the balance between the image line density (resolution) and the frame rate. 
  0 to 3 
Note: For systems without a touch screen, the selection is on the LED panel. 
Maps  Selects a processing curve that assigns echo amplitudes to gray levels. 
  A, B, C, D, E, F 
Note: For systems without a touch screen, the selection is on the LED panel. 
Tint  Changes the color of the image by adding blue, red, yellow, or green to the gray in a gray map. 
  Available settings: transducer-dependent  
Note: For systems without a touch screen, the selection is on the LED panel. 
Edge  Edge Enhancement 
Distinguishes the contours of a structure during imaging.  
  0 (none) 
  1 to 4 
Note: For systems without a touch screen, the selection is on the LED panel. 
Persist   Persistence 
Creates a visible smoothing effect by maintaining lines of image data for each frame of 
imaging. A higher setting includes more frames in the image data. 
  Available settings depend on the transducer and exam type 
THI  Tissue Harmonic Imaging 
  Enables or disables the Tissue Harmonic Imaging feature, used to enhance contrast 
resolution. 
Note: For systems without a touch screen, the selection is assigned to a soft key.