A new imaging modality made available to veterinarians, the PET Scan (positron emission tomography), is not yet fully understood. Dr. Katie Garrett, Director of Imaging, and Dr. Jose Bras, lead surgeon at the Wellington practice, discuss the uses of the PET scan in practice. Diagnosing repetitive stress injuries early has been a challenge for veterinarians. An earlier diagnosis may be possible potentially saving the horse from a more devastating injury. The PET scan, in conjunction with other imaging modalities such as radiology, nuclear scintigraphy and ultrasound, will allow more complete investigations of the difficult lame horse.