A Different Perspective: MPR-Curves in i-Dixel
J. Morita's 3D viewing and treatment planning software, i-Dixel, offers a robust set of tools to review scans and plan treatment digitally. When a scan is loaded, the data is presented in the "volume view" with windows for axial, coronal, sagittal, and 3D perspectives:
The MPR (Multi-Planar Reconstruction) and Dual-MPR tabs allow for different (and arguably more precise) perspective views to analyze a CBCT volume and plan treatment. In either MPR tab, the user draws an "MPR line/curve", along which the software places perpendicular "slices" at adjustable intervals which allow the user to progress through cross-sections of the patient's anatomy in a slice-by-slice perspective. This is a useful tool-- for example-- to analyze discrete regions of interest, trace the mandibular canal for implants, and verify the angle and depth of a planned implant. Below, we will explore some of the different views that can be created by tracing an MPR curve.
Extracting a 2D Pan from a 3D Volume
By tracing our MPR curve along the entire arch, the user is able to create an extracted panoramic image from their 3D volume. To the right of the axial view (in which the MPR curve is drawn), the software compiles a flattened or panoramic image of whatever anatomy the MPR curve spans. If one draws a curve that spans the entire arch, the software will give a panoramic view of the patient's mouth.
*Useful Tip* The number of slices displayed in the bottom window can be adjusted by changing the "Cross Section View Mode" under the Settings section of the viewer:
Tracing an MPR-Curve along a single tooth, implant site, or a few teeth, will provide the user with coronal-perspective set of slices to progress through the mesial-distal aspects of the anatomy. This view is especially useful for mapping the mandibular canal for lower-arch implant cases.
Tracing an MPR line across a tooth or implant site from the buccal to lingual side will allow the user to progress through the area from a sagittal perspective:
The MPR curve can also be drawn into a shape. Creating a circle around a tooth will allow the user to examine circumferential aspects of the targeted area:
Root-Crown (Long Axis)
The user is also able to rotate the axial vie