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New Study: pedCAT Allows for More Accurate Bone Angle Measurements than Radiographs or CT

A study published in Foot and Ankle Surgery compared three common angle measurements of the foot taken from non-weight bearing CT, weight bearing digital radiographs, and weight bearing pedCAT scans. The study concludes, “The angles differed between radiographs, CT and pedCAT, indicating that only pedCAT is able to detect the correct angles… pedCAT prevents inaccuracies of projection and foot orientation in contrast to radiographs due to the 3D dataset which is principally independent from projection and foot orientation.”

The study also found the average image acquisition time for the pedCAT (average 270 seconds) was 70 percent faster than with radiographs and 35 percent faster than with CT.

The study was authored by Martinus Richter, Bernd Seidl, Zech Stefan, and Sarah Hahn.

High Resolution Imaging

Cone Beam CT voxel dimensions vs. Medical CT voxel dimensions
Cone Beam CT voxel dimensions vs. Medical CT voxel dimensions

pedCAT scans give you one of the highest resolution views of the foot and ankle available.

And those high resolution views are infinite – physicians can view the foot and ankle from the axial, coronal and sagittal planes by scrolling through .5 mm slices. The average medical CT slice, in comparison, is about 1 mm – 5 mm thick.

Plus, a pedCAT scan is high resolution from every dimension. To understand what that means, here’s a crash course in 3D imaging: Just like a photo is made up of two-dimensional pixels, a foot scan is made up of three-dimensional voxels. Think of a Rubik’s Cube that’s made up of millions of microscopic mini cubes.  Because the voxels are uniform, or isotropic, a pedCAT scan is the same high resolution in all planes.

A medical CT , meanwhile, is often anisotropic. Imagine that same Rubik’s Cube, but this time made up of microscopic rectangular bricks. A typical medical CT image may only be high resolution in one dimension. The other two dimensions will be relatively blurry. The degree of blurriness will depend on the voxel thickness.

If your practice or medical facility prefers not to settle for anything less than the best, it’s time to consider a pedCAT.