Metron-MD is human medical imaging software particularly focused on chiropractic and podiatry. It features world class imaging algorithms, calibration and measurement tools, multi-image stitching, report generation, full DICOM compliance, and more.
Metron supports a process we call “Guided Mark-Up” in order to provide a uniform way to analyze certain types of images. For example, if you have a lateral radiograph of the cervical spine or of the lumbar spine, Metron supports guided mark-up of these images.
The idea in guided mark-up is to follow the instructions and pick the key points in the image as Metron guides you to. Then, Metron computes several parameters from these points that were picked. Then, you choose which set of measurements you wish to display overlaid on the image. Selecting all makes quite a cluttered image, so generally you select one to four measurements that are of importance for the particular case.
Note that for proper interpretation of these measures, the patient must be positioned appropriately. Here are some brief notes and comments on each of the measures:
Atlas Angle: The angle that the major axis of C1 (from this aspect) makes with the horizontal.
Atlas/Axis Angle: The perpendicular to the posterior side of the C2 body is constructed, and the angle between this constructed line and the major axis of C1.
Atlas/Skull Angle: The angle between a line at the base of the skull (at the level of the foramen magnum) and the major axis of C1.
Note that for proper interpretation of these measures, the patient must be positionedappropriately. Here are some brief notes and comments on each of the measures:
George’s Deviation: George’s line is the curve created by connection points chosen on the posterior sides of all vertebral bodies. According to some literature (based on the “Harrison Spine Model”) suggests that in the ideal case these points lie on a smooth curve which is a section of an ellipse with certain major-to-minor axis ratio. Metron’s “George’s Deviation” parameter is a sum of all the offsets from this perfect elliptical arc. A perfect value would be zero (0.0) meaning that all points lie on the ideal elliptical arc.The higher the value of this parameter, the more deviation there is from a circular arc.
Jackson’s Angle: The angle between two constructed lines: one at the posterior of of L1, and the other at the posterior of the body of L5.