Introduction: - CT is a modality used in imaging of internal structures/ organs by the use of radiation. HRCT is an examination protocol in CT for Lungs and Temporal bone. As HRCT uses thin slices so it provides detailed information which helps in better diagnosis. Aim and Objective:- To evaluate the Role of HRCT Chest in differentiation of pattern of spectrum in lung diseases to find out the different patterns in lung diseases. Methods & Materials:- The study was conducted on a period of 6 months on 30 patients. 16 slice CT machine was used for the scanning and thin sections were acquired by using HRCT protocols. Result:- In out of 30 patients, the common findings are Ground Glass Opacities, Tree In Bud Appearance, Reticular Opacities, Honey Combing, Consolidation Nodular Opacities. Conclusion:- HRCT chest is most important and valuable in diagnosis of lung diseases even when chest X-ray is normal. It is capable of imaging the lung with excellent spatial resolution and provides good anatomical detail.