Skip Navigation LinksHome > Technical Support > Tips and Tricks

Mach Effect Correction

Learn how to use Mach Effect Correction to remove false shadows in images.

The Mach refers to an optical phenomenon where the inbuilt edge enhancement mechanism of the retina (where the edges of darker objects next to lighter objects will appear lighter and vice versa) create a false shadow ("Mach band") in a radiograph. Mach bands generally manifest adjacent to metal restorations or appliances and the boundary between enamel and dentin. This effect has been attributed as a source of diagnostic error in radiology.

By covering up the lighter object, such as a restoration, with a black square, one can reduce this effect and see the actual shade of gray present within the image pixel data without the brain trying to enhance the differentiation. For optimal results, the black square in the Mach effect correction tool should be angled parallel to the edge of the object and sized accordingly to cover it up.

To access this feature, simply look for this icon on the toolbar:

Mach Effect Icon

Then click and drag the black square along the image. You can right-click to rotate the square.

Mach Effect in action (Click to Enlarge)

Mach Effect in action

Office Hours

Technical Support is available Monday - Friday, 8:30 a.m. - 8:00 p.m. ET. You can contact Medicor Imaging Support via email or phone.


Featured Customer Testimonial

"The Royal Veterinary College, London, U.K. selected Medicor's MiPACS DICOM Image Server after an extensive review of solutions on the market. We found it competitively priced, based on rock solid SQL server technology, scalable and easy to deploy and configure."

- Patrick Fischer
Applications Team Manager at the Royal Veterinary College (London, England)