CT scans show different levels of tissue density, and produce more detailed images than x-rays. (thedrakecenter.com)
Yet Friston says the techniques used to analyze brain tissue density in the new study are extremely strict. (scientificamerican.com)
The research team simplified this data using voxel - based morphometry, or VBM — a technique that breaks the brain into 3 - D pixels and permits rigorous statistical comparison of brain tissue density among people. (scientificamerican.com)