Understanding Key Terms in Ultrasound: A Beginner’s Guide to Frequency, Depth, Gain, and Resolution.
Hey there! I’m Mike, and I recently joined the ScanX team. When I started, I had little knowledge about ultrasound, but I kept a note of all the new terms I encountered along with their definitions. In this blog post, I’ll be sharing some of these terms with you, aiming to demystify the language used in the ultrasound field. Whether you’re just starting your journey with ultrasound or looking to expand your knowledge, I hope you find this guide helpful.
Frequency: The Pulse of Ultrasound Waves Let’s start with frequency, which refers to the number of ultrasound waves emitted by the transducer per second. Different transducers have varying frequency ranges, making them suitable for specific tasks. It’s important to strike a balance between image quality and penetration depth. Lower frequencies allow for deeper penetration but compromise image quality, while higher frequencies provide better image quality but limited penetration. Remember, it’s crucial to adhere to safe limits as higher frequencies can generate more thermal energy.
Depth: Zooming In and Out Depth determines how far into the animal’s body we can visualize using ultrasound. It represents our ability to zoom in or out on an object of interest. When we increase the depth we enlarge our field of view allowing us to see deeper into the object, but decreasing our frame rate. Conversely, decreasing the depth focuses in on an object increasing our frame rate. Depth, along with gain, is an often-adjusted setting, typically controlled by a dedicated knob or button on the ultrasound device.
Gain: Enhancing Image Clarity By altering the gain, we can improve the definition between lighter and darker areas on the ultrasound screen. This adjustment modifies the amplification of the ultrasonic waves received by the transducer. Keep in mind that changing the gain affects both the signal and the noise. Machines usually have a separate contrast enhancement adjuster to enhance contrast.
Resolution: Bringing Clarity to Life Resolution is like the number of dots per inch (DPI) in a camera photo. It represents the level of detail that can be captured and displayed. In ultrasound machines, resolution is influenced by the number of crystals in the transducer that transmit and receive the ultrasonic waves. More crystals result in higher resolution and a clearer image on the screen. For instance, a transducer with 128 elements provides better image quality compared to one with only 80 crystals.
Summary: To ensure high-quality ultrasound images, it’s important to understand key terms related to image quality. Frequency determines the trade-off between image quality and penetration depth. Depth allows you to zoom in or out on the object of interest. Gain enhances the definition between lighter and darker areas. Resolution relies on crystal count and screen capability to display fine details.
What’s Next? We hope this beginner’s guide has given you a solid foundation in understanding frequency, depth, gain, and resolution. If you have any questions or want to discuss further, we’d be thrilled to assist you, with no obligation to purchase a scanner from us. At PUM, our team of professional sonographers with over 25 years of combined experience is always here to help you, free of charge. We value your journey with ultrasound, and we’re committed to supporting you every step of the way.