{"id":11112,"date":"2023-07-18T09:06:15","date_gmt":"2023-07-18T08:06:15","guid":{"rendered":"https:\/\/hallmarq.net\/?p=11112"},"modified":"2024-12-19T13:04:37","modified_gmt":"2024-12-19T13:04:37","slug":"low-field-vs-high-field-mri-whats-the-difference","status":"publish","type":"post","link":"https:\/\/hallmarq.net\/us\/2023\/07\/18\/low-field-vs-high-field-mri-whats-the-difference\/","title":{"rendered":"Low-Field vs High-Field MRI: what’s the difference?"},"content":{"rendered":"\n

Ever wondered what the difference is between a low-field and a high-field MRI? Hallmarq Small Animal Advisory Board member Dr. Jennifer Brisson sheds more light on the question that will, at some point, have crossed the mind of anyone employed in the veterinary field. <\/p>\n\n\n\n

Let’s Talk Tesla<\/h2>\n\n\n\n

The definition of low-field vs high-field MRI is determined by magnet field strength. Generally speaking, low-field MRIs are less than one Tesla (T) whereas high-field MRIs are 1.0T or greater. There are pros and cons to each type of MRI and understanding the difference is important when making a selection for your patient or practice.<\/p>\n\n\n\n

The Right Tool for the Job<\/h2>\n\n\n\n

So, why is magnetic field strength important? Magnetic field strength determines the MRI signal, which, in turn, informs the patient’s image. In more specific terms, the MRI signal is proportional to the square of the main magnetic field strength. Thus, MRI signal, and signal-to-noise ratio (SNR), increases with increasing field strength. Higher signal quality leads to better image resolution. So then, why not just use high-field MRIs every time? Let’s review: <\/p>\n\n\n\n

Low-Field MRI<\/h2>\n\n\n\n

Historically, low-field MRIs are resistive or permanent type magnets. They come in lower field strengths 0.3-0.5T, which generate less signal when compared to high field strength units. With less signal comes reduced spatial resolution and longer scan times. There may also be limitations in pulse sequences, including chemical shift fat suppression and MR spectroscopy. Low-field MRIs are generally smaller, less expensive to install, and require less shielding. However, daily power usage of resistive-type scanners can be quite high thus increasing operating expenses. <\/p>\n\n\n\n

Low-field MRIs usually do not require helium. One distinct advantage of low-field MRIs is the open design which improves patient access and visibility. Let’s take a look at the advantages vs disadvantages:<\/p>\n\n\n\n