Background: Volumetric CT is preferable to pulmonary function tests for evaluating the distribution and types of emphysema in COPD patients because it is more accurate and can be performed during an acute exacerbation of COPD as well as in some cases where pulmonary function tests are contraindicated (if there are large emphysematous bullae the patient can develop pneumothorax). COPD is a major cause of death. Due to the fact that not all patients with airway symptoms seek medical care, the number of individuals affected by the disease is frequently underreported. COPD requires increased focus on early diagnosis. Methods: This study was conducted in Minia university hospital- Radiology department during the period from May 2021 to March 2022. On 30 Patients known with COPD collected from the outpatient chest clinic. Results: patient's emphysematous changes on volumetric CT on the studied group in both lungs ranged between 5.6 – 48.0 % with mean value of 20.73±12.179 %. No statistical significant differences were found between current and ex smoker and between pulmonary function test and volumetric CT findings. Conclusion: The findings of the present study indicate that in the diagnosis and follow-up of COPD patients with emphysema, volumetric CT assessment of lung emphysema plays a critical complementary role with spirometry.