Illustration of extended CT number scales
Standard CT reconstruction data is stored using 12-bit unsigned integers (i.e. having possible values of 0 to 4095). These unsigned values are rescaled to a range encompassing -1024 through 3071 (using an offset, or intercept of -1024). However CT data can also…
CT Density Tables
The use of CT data within a planning system necessitates a conversion from the Hounsfield scale, with units (HU) describing the radiodensity of the imaged tissue (compared to water, for X-ray energies), into density values, which the planning system can…