Mastering veterinary ultrasound: Practical tips for clearer imaging
Operating a veterinary ultrasound machine can initially feel daunting, but learning some basic techniques can significantly enhance the quality of your images. In this article, we’ll go over some of the major settings for your ultrasound machine when scanning small animals to help you get the best sonogram you can.
Before you start…
Prepare your patient
A well-prepared patient can make all the difference. Ensure the animal is calm and comfortable, which may involve sedation if necessary. Clip the fur in the area to be scanned, clean the skin to remove dirt, and apply a generous layer of ultrasound gel to ensure optimal contact. These steps help reduce artifacts and improve image clarity.
Set up the scanning environment
Keep the scanning room dimly lit to reduce screen glare and improve visibility. Ensure the veterinary ultrasound screen is free from dust and fingerprints, and clean the probe after each use following the manufacturer’s guidelines. Creating a comfortable and ergonomic workspace will also help you conduct scans for longer periods without strain.
Step-by-step guide to effective veterinary ultrasound imaging
- Selecting the right probe for your veterinary ultrasound
Choosing the appropriate probe depends on the type of scan you need. The microconvex probe is a versatile tool, producing a wedge-shaped image and balancing frequency with penetration, making it perfect for small animal abdominal scans. Linear probes are high-frequency with a flat footprint, ideal for imaging shallow structures like eyes or muscles. For deeper imaging, such as echocardiography, use phased array probes, which have a lower frequency but greater depth penetration.
- Setting overall gain for optimal brightness
Adjust the overall gain to control the image’s brightness. Increasing it makes the entire image brighter, while decreasing it darkens it. The goal is to achieve a balance where tissues are different shades of gray and fluids are black. This initial step is crucial for consistent comparison throughout the veterinary ultrasound exam.
- Adjusting time gain compensation (TGC) for depth consistency
TGC sliders allow you to fine-tune the gain at different depths of the scan. Since returning signals weaken with depth, these controls ensure the image remains uniformly bright. Typically, this results in a diagonal slider configuration from left (near field) to right (far field). Adjust TGC to keep tissue brightness consistent, especially when scanning structures with varied densities.
- Placing the focal zone for clearer images
Position the focal zone at the depth of interest for the highest resolution. Most veterinary ultrasound machines show an arrow or marker that moves up and down the screen as you adjust the focus. Proper focal zone positioning helps achieve the clearest image of the targeted area. Machines with multiple focal zones can enhance resolution throughout the scan but may slow down the frame rate.
Adjusting ultrasound depth and frequency for best results
- Adjusting depth for optimal framing
Set the depth so that the organ or region of interest fills about three-quarters of the screen. This framing helps provide a detailed view of the structure while maintaining context.
- Adjusting frequency for clear imaging
Higher frequencies yield better resolution but have limited penetration. Adjust the depth first, then set the highest frequency suitable for that depth. Most probes operate best at their mid-frequency range, so find the balance that provides clear, detailed images.
Using veterinary ultrasound presets for efficiency
- Leveraging machine presets
Veterinary ultrasound machines often include presets for different probes and scenarios, such as small or large animals and specific scan types (e.g., abdominal or cardiac). Presets provide a good starting point, especially if manual adjustments haven’t produced the desired results. Resetting to a preset can also help revert to baseline settings if the sonogram becomes unclear.
Conclusion
By following these practical tips and step-by-step guidelines, you can improve your use of veterinary ultrasound machines and achieve clearer images. To continue enhancing your skills, consider investing in veterinary ultrasound CPD or a veterinary diagnostic imaging course.
