Trying to adjust the image on an ultrasound machine isn’t like adjusting the rabbit ears on an old television. It takes specific knowledge of the machine. Having a clear image on the monitor will help the technician and doctor see better and make an accurate diagnosis. Machines like the Phillips Epiq 7 are state-of-the-art and come with the necessary tools to adjust images. Some ultrasound images are already difficult to view, so there’s no need to make it more difficult. Here are some ways to improve ultrasound imaging.
Start with the Right Presets
The quickest way to improve the image is to ensure you use the right presets. Using presets puts you in the best starting position for the examination. It will also reduce the number of alterations you need to make to the background settings. A cardiac preset, for example, will commonly feature a low grayscale that will increase the frame rate. This is a useful feature because you’re less interested in subtle tissue differences and more interested in fast-moving anatomy.
Check the Imaging Depth
Ultrasound depth is a control that makes a big difference. The organ you want to see should fill three-quarters of the screen. If you don’t adjust this first, you will probably have to adjust the gain and frequency a second time.
Use the Optimal Frequency
Most ultrasound probes have multiple frequencies, which is why it’s important to select the right one. The higher the frequency used, the higher the image resolution. However, a lower frequency provides better penetration. You should select the highest frequency that will provide adequate penetration.
Adjust the Overall Gain
Gain controls the image’s brightness. It’s easy to assume that having the gain set high will improve the view. However, if the image is too bright, it will wash out the dark areas. It’s better to set the gain lower, resulting in a darker image. You should also view the image in a darkened room, as it is easier to see that way.
Understand Time-Gain Compensation (TGC)
If your machine has time-gain compensation (TGC), you can alter the gain in steps as you move down the screen. Ultrasound beams are attenuated as they travel away from the probe. The deeper they go, the weaker the returning signal is. This makes the image darker further down the screen. TGC allows you to compensate for this.
How to Use Focus Points
Some machines allow the user to adjust the number and position of focal points on the screen. Increasing the number of focal points makes the machine work harder, which reduces the frame rate. To see movement, you only need one focal point. Using several focus points will increase the visibility of larger organs.
Authored by J. Guerra
Ultrasound Imaging Expert
formerly MXR Imaging / Conquest Imaging
