Standing Equine PET Now In Use At UC Davis

UC Davis has welcomed the latest standing equine PET scanner, the MILEPET, into clinical use, less than six years after performing the world's first PET scan on a horse.

Thanks to funding support from the UC Davis Center for Equine Health and the Stronach Group, the UC Davis veterinary hospital recently installed the most recent MILEPET. After the installation of the first scanner at Santa Anita Park racetrack, a second scanner was set up on the East Coast at the University of Pennsylvania. This newest instrument at UC Davis will provide the most innovative equine imaging technique using only standing sedation to the Northern California horse population.

Since the first equine PET scan was performed at UC Davis in 2015, there have been many other “firsts” as the team, led by Dr. Mathieu Spriet, worked to develop the use of the technique to improve detection of injuries in equine limbs. The   s were performed two years ago, removing the need for horses to undergo general anesthesia during imaging. Subsequently, our group validated the first scanner designed specifically to image horses prior to its installation at Santa Anita in Southern California. This scanner has now been used for over 200 studies at the racetrack, contributing to reducing the number of catastrophic injuries in racehorses.

For the past five years, the UC Davis veterinary hospital's robust equine clinical program has imaged over 100 horses, but until recently, all of these scans were performed with the piPET, a scanner originally developed to image the human brain. This program accomplished several milestones in the development of equine PET, establishing applications not only for racehorse safety, but also for diagnosis of bone and soft tissue injuries in sport horses and improved understanding of laminitis. The clinical use of the technique was limited due to the requirement to anesthetize horses, which increases costs and risks associated with the procedure.

The initial clinical case utilizing the new scanner at the UC Davis veterinary hospital was another first, a mule named Jool. She was the first patient included in a clinical trial aimed at combining standing PET with standing MRI to provide the most advanced imaging for foot lameness in horses (or mules).

In addition, a second standing PET study is underway, aimed at assessing the progression of laminitis. Laminitis is an extremely debilitating disease that can unfortunately be fatal. Laminitic patients require long-term, careful hoof care performed by an experienced farrier. UC Davis veterinary hospital farrier Shane Westman has a long list of these challenging patients. In order to manage the trimming and shoeing optimally, Westman relies on imaging techniques. In a pilot study performed on laminitic cases at UC Davis, PET demonstrated its value in precisely assessing the involvement of the soft tissues of the foot with laminitis. As PET now becomes available using simple sedation, it simplifies the use of the technique and allows for repeated scans every time a patient comes for shoeing and trimming.

In addition to these two specific clinical research studies, standing PET is now available to any equine patient in Northern California. Standing PET can image any area of the limb from the foot to the carpus (knee) or tarsus (hock).

The racehorse population of Golden Gate Fields racetrack will also benefit from the new PET scanner. As the technique has quickly gained in popularity at Santa Anita Park, a few Northern California racehorses have traveled south to be imaged with PET. Now these horses won't need to travel so far. In addition to being in operation at UC Davis, the MILEPET scanner will soon be transported on a weekly basis to image horses at the equine hospital at Golden Gate Fields.

Dr. Spriet was very enthusiastic about these latest developments in the UC Davis equine PET program, “The standing PET scanner will allow us to offer this cutting-edge modality to more cases than we could before. Repeating scans on the same patient will help us optimize treatment and rehabilitation for better outcomes.”

“Through support from our donors and endowments, we have been able to support the equine PET program at UC Davis since 2016 by providing both research and equipment support,” said Dr. Carrie Finno, director of the UC Davis Center for Equine Health. “It is incredibly rewarding to see this technology now being used to prevent catastrophic injuries in racehorses across California.”

More horses, and mules, will be scanned in the near future!

Read more here.

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New Standing MRI Has Already Helped Diagnose Nearly 70 Horses At Santa Anita

Can MRI technology, the gold standard for diagnosing human sports injuries, offer an effective diagnostic solution for veterinarians and racehorse trainers who prepare their horses to prevent racetrack fractures?

A group consisting of the Dolly Green Research Foundation and The Southern California Equine Foundation as well as several individuals, recently came together to purchase and install a Standing Equine MRI system, from Hallmarq Veterinary Imaging, at Santa Anita Park racetrack. The group is working closely with the Stronach Group, owners of Santa Anita, to introduce the technology to veterinarians and trainers.

“The Stronach Group is excited about the addition of a standing MRI to the existing diagnostic options for horses at Santa Anita Park,” said Dr. Dionne Benson, chief veterinary office for The Stronach Group. “Together with the standing PET (Positron Emission Tomography) system, which was installed at Santa Anita late last year, these new modalities greatly improve the ability to identify preexisting conditions, is an important step in ensuring horse safety and welfare.”

The groups began fundraising for the MRI last fall and were able to reach their target goals to allow purchase and recent installation.

“Hallmarq's Standing Equine MRI (sMRI) system brings the same diagnostic capability to equine clinical practice as the human sports medicine field” said Dr. Dan Brown, vice president and chief customer officer, at Hallmarq.  According to Brown, there have been close to 70 horses diagnosed using the Hallmarq MRI at Santa Anita.

Brown said that soft tissues are very hard to evaluate on radiographs and bone changes will show up on MRI weeks before they can be seen on x-ray, which can make a big difference for a horse trainer contemplating entering a horse in an upcoming race.

With the equine patient being at the forefront of every design decision, Hallmarq's unique sMRI capability avoids the risks associated with general anesthesia and allows equine veterinarians to offer clients the most advanced lameness diagnosis method on an outpatient basis.

“Traditional lameness diagnosis is often a cycle of trial and review that relies on a slow process of elimination,” said Brown, a former veterinarian with over 20 years' experience in the veterinary profession.

“The integration of Hallmarq's standing MRI to our diagnostic imaging center at Santa Anita has been seamless,” said Dr. Ryan Carpenter, one of the on-track veterinarians at Santa Anita. “Being able to identify bone pathology at the earliest stages allows us to intervene long before these abnormalities could be seen on radiographs. Knowing that we have this technology at our fingertips where horses can literally walk out of their stall, undergo sMRI and be back in a matter of a couple hours speaks to the commitment to greater safety for our athletes.”

Hallmarq has developed unique equine expertise over almost two decades by imaging more than 100,000 horses at 100 sites over six continents. With Q-Care, Hallmarq's world-class support system, customers have experienced uptime of greater than 99% and upgrades to their systems to ensure that practices enjoy a diagnostic rate in excess of 90%.

Other racetracks have used the system, including the world-famous Hong Kong Jockey Club.

“We installed the Hallmarq standing MRI in 2013 and since then have performed hundreds of examinations of the lower limbs primarily in Thoroughbred racehorses,” said Dr. Paul Robinson, Head of Veterinary Clinical Services at the Hong Kong Jockey Club. “We have found the information obtained to be invaluable in the identification of injuries that are not visible on conventional imaging modalities and it has helped us to manage a variety of conditions using an objective, targeted approach.  Of great interest in our population is the capability to perform multiple follow-up studies of the region of interest to monitor the healing process of subchondral bone lesions in the lower cannon bone of our thoroughbred population.”

Read more about standing MRI in this 2015 Paulick Report feature.

Standing Equine MRI Benefits:

  • MRI can show problems that are not visible, or at an earlier stage than they would show up on any other imaging method.
  • Standing MRI occurs under very light sedation, without anesthesia. This both eliminates risk of injury and makes it much easier for a client to say “yes” then conventional 'down' MRI.
  • MRI involves no radiation unlike, CT, bone scanning or radiography.

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