Measurement of spatial resolution of the micro-CT system

The performance test is an important and necessary work for the micro-CT (computed tomography)system.The focal spot size of the micro focus X-ray tube is measured.The method of measuring the spatial resolution of micro-CT is introduced.A line-pair resolution of 28.2 lp/mm at the 10% modulation transfer function (MTF) level can be achieved with 14.7 μm spot size,12.3 μm voxel size and a 25 mm field of view.In addition,a tungsten wire with the diameter of 5 μm can be detected by the system.