Our Blogs

What is CT?

• The CT moves 360 degrees around the region of interest, taking multiple x-rays at various angles
• The images are then reconstructed to create a 3D image of an individual structure.

When is CT used?

• Gold standard for bone changes (especially subtle bone changes)
• Bone chips and fracture lines
• Penetrating injuries, especially to the foot
• Surgical planning of fracture repairs
• Areas of complex anatomy (skull, sinuses, dentition, hyoid).

What are the benefits?

• No superimposition as with 2d x-rays – can reformat images in alternate cross-sectional planes/3D
• Very quick acquisition time, however preparation and positioning of the patient takes time.

What is the procedure?

• Full lameness evaluation to localise the region of lameness
• For standing CT, a catheter is generally placed to maintain sedation throughout
• Some CTs require a general anaesthetic

What are the limitations?

• Restricted to limbs, head and neck depending on the size of the patient and the CT bore
• MRI is still gold standard for soft tissue injuries. However, contrast agents can be used to highlight some soft tissue injuries
• Cost
• Availability

What are the risks?

• Minimal risk for standing CT
• Recovery from GA for a horse is always high risk
• Radiation safety applies in the same way as taking x-rays – handlers must wear a lead gown, thyroid collar and dosimeter.  Ideally, a lead shield is placed between the handler and the patient.

Reconstructed 3D image of the hoof