CT Number Correction for Small Vessel Plaque Quantification

The patent applies parameter changes by introducing a size-dependent correction function that adjusts CT numbers based on the geometric size of the target object. The correction function modifies the measured CT number using the formula: Corrected CT number = Measured CT number / (1 - correction factor), where the correction factor is derived from the object's size. This parameter adjustment compensates for the size-related attenuation artifacts introduced by matrix reconstruction algorithms, thereby recovering accurate CT numbers for small vessels and plaque while preserving the diagnostic capability enhanced by these algorithms.

The patent replaces mechanical/improvement-based spatial resolution enhancement with a computational correction approach. Instead of relying on physical improvements in detector geometry or reconstruction algorithms to achieve better spatial resolution, the system uses a mathematical correction function that compensates for size-related measurement errors. This substitution allows the system to maintain accurate measurements of small objects (vessels and plaque) without requiring physical improvements in spatial resolution capabilities.

The patent applies the copying principle by creating a simplified mathematical model (correction function) that replicates and compensates for the size-related measurement errors. The correction function uses a straightforward formula based on the object's geometric size, avoiding the need for complex iterative reconstruction algorithms or additional hardware. By copying the error pattern and applying its inverse, the system achieves improved measurement precision for small objects with minimal increase in computational complexity.