There is no pathological CT atlas currently available within veterinary medicine. There is therefore a need for such an atlas for anyone working with this type of diagnostics, and is also my conclusion after working extensively with CT over the last 4 years.

The atlas is saved in digital format, facilitating browsing through the CT series in a totally different way to using a paper-based atlas. By being able to browse between images, the viewer is able to see dynamic changes – something which is not possible if only being able to look at one or two images from a CT series.

A lot of emphasis has been put on specialist aspects of the field, in that all the patients have had diagnosis confirmed by pathology or histology. Thanks to the help of many professionals at universities and private clinics, it was possible to obtain a total of 100 patients for the atlas.

The patients selected give a good cross section of diagnostic applications within small animal medicine for the use of CT. We have tried to segregate the patients in the atlas as much as possible to achieve representation for each area.

It was a challenge to collect all the necessary patients, as in addition to the CT images, we also wanted anamnesis and pathology/histology. Each patient then had to be entered and presented in an understandable and clear manner. The images used in the atlas were selected as the 24 most descriptive from the total CT series. This usually involves CT exposures taken with contrast if used. Quantity, type and scan delay (the time elapsed from giving contrast to scanning the patient) is stated in each instance. Window interval (Hounsfield interval) was selected as the best interval to view the area concerned in the best possible way. Which interval was used is stated under Imaging Comments. 3D and MPR (Multi-planar reconstruction) are also stated to provide a better overview and facilitate diagnosis. The DICOM files (raw data images) can also be downloaded for processing in an image processing program.

A major challenge encountered in the project was designing and implementing a way to present the patients. I have designed and programmed the atlas myself in HTML, the programming language for internet presentations, with the aim of being able to browse through images and present patient data in a clear manner.

I hope the atlas will be a valuable aid to anyone starting to use CT, and for more experienced users of this type of diagnostics.

 Jo Oeding Amundstad - Bergen 01.01.2007



Jo Oeding Amundstad / Jens Arnbjerg
Billeddiagnostisk afdeling
for Fødevarer, Veterinærmedicin og Naturressourcer.
Københavns Universitet
© Copyright februar 2007