CT Scans Added to Washington State University Vet School's Equine Imaging Options

A Quarter horse mare recently underwent a spiral
CT scan to examine a mass near one of the
carotid arteries leading to her head

Washington State University's Veterinary Teaching Hospital (VTH) has installed a new spiral computed tomography (CT) scanner for use in both small and large animals, with funds donated by a generous family. 

The VTH has had a CT scanner for more than two decades and a magnetic resonance imaging machine (MRI) since 1996.  With the new Toshiba Aquilion 16-slice spiral CT unit operational, both MRI and CT in WSU's veterinary college are among the most advanced complementary tools for diagnostic imaging in the profession. 

 "Before the new CT, we only imaged a few horses a month  (using CT), but now I would expect to do 10 times that," said Professor John Mattoon, a board certified veterinary radiologist and chief of WSU's diagnostic imaging section.  "There were limitations with the old technology that hampered its everyday use, but the new CT is truly state-of-the-art, with brand new software that greatly improves its capabilities.  Our goal is to examine 100 horses a year with the CT, and several small animals a day."

Speed is one of the new CT's main features.  It can scan 1750 millimeters (mm) or about 5.75 feet of a patient's body in 1 mm slices in 38 seconds.  Twelve images per second are displayed and all 1750 digital images are delivered within three minutes.  The machine's resolution can "see" details as small as 0.35mm; a little more than 13/100ths of an inch.  The imaging is produced in a variety of planes as well as in three-dimensional representations of anatomic structures. A small animal can often be imaged in the new CT scanner in seconds, in many cases without general anesthesia.

"A horse with a complex fracture was examined with the new CT in early June and it was completed in a couple of minutes," Mattoon said.  "The anesthesia and prep-work it takes to get the horse into the machine takes much longer than the actual exam.  By comparison, MRI may take an hour or more. Still, these two imaging modalities are complementary to each other, and one does not necessarily exclude the use of the other."

Horses are too large to fit entirely in the CT scanner, so only the head, upper neck, and lower limbs are imaged.  For smaller animals, the entire body can be scanned, and is especially useful for examining the lungs and abdomen.

"CT scans are the first choice in human medicine for imaging the lungs and abdomen, and I think it should become the standard of abdominal imaging in smaller animals as well," said Mattoon, who has practiced radiology for more than 25 years.    

As a result of the CT's speed, animals have to spend much less time under anesthesia, if at all.  "For horses, we can use a short-acting anesthetic, and some small animals can just be sedated without undergoing anesthesia," Mattoon said.  "This is an important advancement because there are always risks associated with anesthetizing an animal.

"Overall, CTs at WSU should be less expensive because exams take less time and anesthesia.  This particular new CT scanner should also open up a whole new area of research, including vascular imaging and shunt studies. I imagine that in the beginning we will do a lot of cases in which we use both CT and MRI."

This brief video showcases Washington State's new CT service, as illustrated by the Quarter horse with the cartoid artery mass that needed to be imaged.

Information and elements for this article are the property of Washington State University.

19 June 2010 | Fran Jurga's Hoof Blog at Hoofcare.com

© Fran Jurga and Hoofcare Publishing

Please, no use without permission. Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.

Pollitt's Laminitis Images Have a New Look: MIMICS Software Goes 3-D

by Fran Jurga | 27 September 2009 | Fran Jurga's Hoof Blog

The cover of the Proceedings of the 2009 laminitis conference is a compilation of images of one foot of a chronic laminitis case from the University of Queensland in Australia. The foot's CT scans were converted to 3-D images using Mimics software and the expertise of Dr. Simon Collins of the Animal Health Trust in Newmarket, England. (Double-click on image for a larger view in a new window, but sorry that the web requires a low-resolution version of a very high-resolution form.)

When the end of the Fifth International Equine Conference on Laminitis and Diseases of the Foot comes, attendees might remember proportionately less of what they heard...and more of what they saw.

The heightened visual aspect of the exciting biennial conference, which will be held November 6-8 in West Palm Beach, Florida, may lie in the technology side of things, but the impact will be an eyeful that everyone can appreciate.

Leave it to Dr. Chris Pollitt (photo inset at left), assistant director of the conference, to bring the latest and greatest technology to the conference and to enhance his presentations.

The new software is called MIMICS; it is made by a Belgian company called Materialise NV. In a nutshell, MIMICS converts CT scans into three-dimensional forms. I've also seen it used to model a nasal cavity for a surgery case at Cornell's vet school, and for a comparative study of the soft tissue structures of equine feet at Auburn University. Dr. Pollitt says that MIMICS software is used extensively for human skeletal reconstruction surgery and prosthetic implant design and simulation.

"Suddenly I can 'see' an individual horse’s foot from all angles and can virtually dissect it on the computer monitor," Dr Pollitt wrote in the Proceedings.

MIMICS was introduced to Dr Pollitt and to the world of laminitis by British hoof anatomy researcher Dr Simon Collins. Dr Collins will be in Palm Beach to explain how he uses computer modeling in his work at the Animal Health Trust, where he collaborates with lameness experts Drs Rachel Murray and Sue Dyson. His images will be dazzling.

Dr Pollitt wrote in his introductory essay in the Proceedings, "Analyses of feet with chronic laminitis clearly show that distorted tubular hoof growth, lamellar wedge formation and solar loading of the distal phalanx are relentlessly destructive to bone. It behooves laminitis caregivers to understand the unmitigated, severe chronic process and develop proactive, early intervention strategies that will measurably arrest the process. MIMICS in the hands of laminitis scientists will aid this process."

Does anyone besides me see great irony in the way that Dr Pollitt over the years has created stunning visual images of the terribly destructive disease of laminitis? The quality of his images is always worthy of Scientific American or National Geographic and yet the subject is the disease we all dread. Thanks to his artistic eye we all know what laminitis looks like, even though it's the disease we'd most like to see wiped off the equine map.

NOTE: The deadline for registration for the conference has been pushed back to September 28th, since the mail has been so slow in getting the brochures and registration forms to everyone. Brochures were sent to all subscribers to Hoofcare and Lameness Journal. Also, a reduced rate for two-person registrations has been added. Visit www.laminitisconference.com for more information.

Credit: Individual cover images were created by Dr. Simon Collins of the Animal Health Trust in Newmarket, England using MIMICS software, and are used with permission; they illustrate pathology on the “Bronski” chronic laminitis case studied by Dr. Chris Pollitt at the Australian Equine Laminitis Research Unit in 2009. Cover montage and design by Fran Jurga will be published with Proceedings of the Fifth International Equine Conference on Laminitis and Diseases of the Foot in West Palm Beach, Florida November 6-8, 2009.

© Fran Jurga and Hoofcare Publishing. No use without permission. You only need to ask. Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to blog@hoofcare.com.