Medical Image processing is one of the prominent detection analysis and goes hand in hand with Cancer detection, diagnosis and treatment. Early detection, diagnosis and treatment are of utmost importance and can improve chances of survival. Filtering, morphology, statistical analysis of the malignant tumours after automatic detection or segmentation of the suspected area of the lungs are some of the basic techniques of study adapted in any radiological imaging techniques. Lung cancer is the leading cause of cancer-related death in both men and women. This work is concerned with the analysis and classification of bright spots in the tumour. Bright Spots ratio of the tumour is an important ratio, which is nothing but the ratio of number of bright spots and the area of the tumour that is detected. A key problem in finding the number of bright spots is that the images need to be pre-processed.