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What Probe do I Need for my Ultrasound System?

What Probe do I Need for my Ultrasound System?

When choosing an ultrasound system, it can be difficult to know what probes work best for your practice and ultrasound system. Probo Medical is the leader in the ultrasound industry, so we’ve developed ultrasound transducer guides to help our customers through the often confusing process of purchasing ultrasound equipment. However, how does one read ultrasound transducer guides and understand what each descriptor means?

Use this blog post and our transducer guides for reference, but when you have questions or are interesting in purchasing, please contact us. We will be able to make sure that the probe or system you purchase is a perfect fit for your practice and current ultrasound equipment!

Probe Type

Probe types are most easily determined by looking at the shape of the probe. Each type of probe has a different specialty, but some can be used for a myriad of tests. We’ll explain some of the most popular ones below in detail.

Linear Probe

Linear probes have a flat array and appearance. They are used to scan small parts and shallow structures like the thyroid in your neck. Linear probes produce a more square or rectangular image.

Convex Probe

Convex probes (also called curved linear probes) have a curved array that allows for a wider field of view. Convex probes are primarily used for abdominal scans due to their wider and deeper view.

Endocavitary Probe

Endocavitary probes have a much longer probe handle and a “U” shaped lens and array. These probes are used for scanning the inside of the body. Because of the shape, endocavitary probes do not have a great range of depth, but they allow for a wider field than even the convex probes.

Phased Array/Cardiac Probe

Phased array or cardiac probes have a smaller handle with a square-shaped lens and array. Usually, they scan images of the heart. Phased array probes will have greater depth in order to reach the heart and produce an image.

Transesophageal (TEE) Probe

TEE probes are cardiac type probes that provide an obstructed image of the heart by inserting the probe into the esophagus, and into the patient’s stomach. These probes move 4 different directions, and movement is controlled by the handle controls.

3D/4D Probe

3D probes function the same as 2D probes, with the exception of a moving array. The array inside the probe moves in a sweeping motion and captures slices of images from different sides. The captured slices are then all put together to produce a 3D still image, or a 4D live image.

Probe Name

Ultrasound probe nomenclature can seem like a mystery, and sometimes not even the best of us understand what each letter and number means. Each brand has its own way of naming the probes to indicate their abilities and specialties. For example, GE’s pencil transducers all start with a “P” – like the P2D.

The numbers typically indicate the bandwidth of the probe. Using the GE C1-6-D for example, the bandwidth is 1.4-6.0 MHz which is represented by the 1 and the 6 in the probe name. It is also a convex probe, represented by the “C”, and has a digital connector, which is represented by the “D”.

The great news – you don’t have to understand the nomenclature. We do! You’re welcome to keep trying, or you can call us and we can help you find the probe that’s right for your practice and your system.


The description of the probe is pretty straight forward. It typically explains the probe type, the aspects that differentiate it from other probes, and states any neat features that it has that can enhance your practice.


Likely this is the most important section for you to look at as it explains what the probe is made to do. Since the transducer guides are already separated by system, your next focus should be finding probes that fit the applications offered by your practice. Fortunately, each of our transducer guides has a search bar on the top right so you can type in the application you need. Then, you can look through the rest of the guide to determine what bandwidth, field of view, and footprint fit your needs best. When you find the probe you need, you can most likely click the probe name as it is linked to our product page.

Field of View

Depending on the type of probe, this will be described in mm or in degrees. The field of view is how large of an area the probe’s image displays while scanning. Linear probes only scan straight down, so their field of view is most likely explained in mm terms. Other probes have a curved array, so their field of view is described by degrees.

For the probes that have field of views described in degrees, think of it like this image of a protractor. If it’s 120 degrees, it will have a field of view of 0-120 degrees on the protractor. We’re bringing you back to 4th grade math class and we promise you’ll get an A+ this time.


Bandwidth is the range of frequency that the probe emits electrical pulses from the piezoelectric crystals. Ultrasound probe bandwidth can be compared to golf – the further you want to hit, the lower the number of golf club you use. On the other hand, the more accurate you need to be, the higher number of golf club you want to use. For example, for distance, you’d use a 2 Iron versus a 9 Iron. Get the idea?

The goal is to get the most accurate club that can hit the distance you need. The same can be applied to ultrasound probes. For deeper scans, you need a low frequency. For more superficial scans, you need a high frequency. What you must balance is depth vs frequency in that you want the clearest, most accurate picture possible. And that’s when you rely on our educated team to guide you towards the best probe for the tests you are performing.

At your next dinner party, you can now pose the question about what golf and ultrasound have in common and blow everyone away with your physics knowledge. You’re welcome.

Biopsy Guide

This section explains what options the probe has for biopsy guides.

Depth of Field

The depth of field explains how deep the ultrasound probe can scan.


The footprint provides measurements of how large the ultrasound probe area is that would be touching the patient’s body. This is an important metric when you take into consideration where the probe will be scanning when imaging a patient.

How Probo Medical Can Help

If you need a new or refurbished ultrasound probe, give us a call at 1-317-565-4275 or email us at and one of our knowledgeable ultrasound transducer sales specialists will be happy to answer your questions!

If you need ultrasound service, support, systems, parts, transducers/probes or service training by experienced ultrasound technicians, our partner, Trisonics, has been setting the Gold Standard for ultrasound service since 2004 and can assist you with repair and maintenance of your ultrasound equipment. Give them a call at 1-877-876-6427 or email to get a quote.

*Our probe guides may not always be an all-inclusive list. OEM’s are constantly updating what probes go with each system. Please consult a sales representative or your OEM representative for more information on the right probe for your system.

DISCLAIMER: This video and / or written content is for informational purpose only and should not be taken as medical advice. Please consult licensed medical professionals and / or the original equipment manufacturer’s instructions for use and operators manuals for advice on how to use any advertised equipment. Additionally, the features on advertised equipment vary and may be different than displayed. Please consult a sales representative at Probo Medical LLC or MedCorp LLC to verify what is available on the system you purchased from Probo Medical LLC/MedCorp LLC or are interested in purchasing from Probo Medical LLC/MedCorp LLC.