High - resolution CT of the lung is a specialized CT technique for greater detail of lung parenchyma and it utilizes -
Principles of HRCT are:-

             i)  Narrow beam collimation (thin collimation)
             ii)  High-frequency reconstruction algorithm, e.g. bone algorithm
             iii) Small field of vision
Special lung filters
Thick collimation
Bone algorithm for image reconstruction
Large field of view