Once you've got to grips with standard B Mode (2D imaging), you may start to feel confident to use the Colour Doppler function on your scanner, either in the abdomen to confirm blood flow or in a cardiac study. Due to the differing blood flows between an abdominal and cardiac scan it is important that you choose the correct preset on your scanner for the job. Not only will the analysis and reporting functions be different, but the background setting for each imaging mode will differ and, if you use the wrong settings, you will really compromise your scan. That said there are adjustments you will make as you carry out the Colour Doppler study to optimise for the patient.
Head over to the following blog post https://lnkd.in/eVni_Ne8 on our website which provides details on making basic adjustments in colour doppler imaging. There a many other blog posts on the site to help you optimise your imaging, feel free to have a browse
For more information and guidance on how you can start understanding more about driving your ultrasound scanner and getting the best out of it, visit https://lnkd.in/eYRterFc or email [email protected] to arrange a training session.
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Focussing your image
You do it without thinking when you take a photo, yet very few people adjust the focus on their ultrasound scanner when scanning a case. Adjusting the focus on an your scanner is normally really easy to do and will help with the quality of your image, so make it one of your four major adjustments in every scan. There are two adjustments that can be made with the focus control:
• Adjustment of the focal zone size – your scanner will have the ability to either add additional focal zones and then space them out to give a larger focal zone, or to use a rotary control to increase the size of the single focal zone. The number of focal zones or size of zone is usually indicated by markers on the side of the image (see bar on right hand side of image in video clip). One compromise of using a larger focal zone will be a reduced frame rate, which may make the image look blurry or laggy, particularly if the patient is moving or wriggling. If this is the case, reduce the size of the focal zone. There are other adjustments such as persistence (frame averaging), line density or even scan width that can help reduce the ‘blurriness’ of the image.
• Adjustment of the focus position – a control on the scanner will allow the position of the focal zone to be moved up and down the image. It’s important to position this at the level, or even just a bit below the structure of most interest in the image. If the main interest is closer to the skin move the focus up and if it’s deeper move the focus down. You will notice the image quality of the structure of interest improving when the focal zone is aligned with it.
Be prepared to alter the size and position of the focal zone during the scan as you move the probe over the patient. By using the four main controls (Depth, Focus, Frequency and Gain) during the scan, you will learn how to quickly and efficiently optimise the image quality to get better diagnostic scans. There are a huge number of other ad