Mindray DC-40 Operator's Manual page 82

Imaging Adjustment
Description More information can be obtained without moving the probe or changing
the sampling position.
1. To change the scan range, tap [FOV] on the touch screen to enter the
FOV (Field
of View)
2. Press <Set> to switch between FOV range and FOV position.
3. Rotate the trackball to adjust the FOV position or the FOV range.
When the scan range is adjusted to its widest, the FOV position cannot be
changed.
You can get a much larger field of view when selecting a larger FOV.
The frame rate decreases when using a larger FOV.
Use the <Angle/Steer> key on the control panel to adjust the steer angle.
B Steer
Tap [ExFOV] on the touch screen to turn the function on/off.
ExFOV
(Extended
For linear probes, the ExFOV function displays as trapezoid imaging.
FOV)
For convex probes, the ExFOV function displays as extending the
scanning angle.
The FOV position/range is available only for convex and phase probes.
Impacts
The ExFOV function is available only for linear and convex probes.
The B Steer function is available only for linear probes.
Line Density
Description The function determines the quality and information of the image.
Adjust the line density using the [Line Density] item on the touch screen.
Operations
There are four levels of line density available: UH, M, H, L.
The higher the line density, the higher the resolution.
Effects
The higher the line density, the lower the frame rate.
Impacts
Dynamic Range
Description This function is used to adjust the B image resolution to compress or
expand the gray display range. The real-time value displays in the image
parameter area in the top-right corner of the screen.
Adjust the dynamic range through the [Dyn Ra.] item on the touch screen.
Operations
Rotate the knob clockwise to increase the value. Rotate the knob
counterclockwise to decrease the value.
The adjusting range is 30-240dB, in increments of 5dB.
The more the dynamic range, the more specific the information and the
Impacts
lower the contrast with more noise.
5-6 Image Optimization
FOV range and FOV position adjustment status.