Computer aided detection cade also called computer aided diagnosis cadx are systems that assist doctors in the interpretation of medical imagesimaging techniques in x ray mri and ultrasound diagnostics yield a great deal of information that the radiologist or other medical professional has to analyze and evaluate comprehensively in a short time. Fda research program for quantitative imaging and computer aided diagnosis and synthetic lung nodules with different shapes sizes and radiodensities computer aided detection of . Lung imaging and computer aided diagnosis brings together researchers in pulmonary image analysis to present state of the art image processing techniques for detecting and diagnosing lung cancer at an early stage the book addresses variables and discrepancies in scans and proposes ways of evaluating small lung masses more consistently to allow . Lung cancer remains the leading cause of cancer related deaths worldwide early diagnosis can improve the effectiveness of treatment and increase a patients chances of survival. A novel level set based computer aided detection system for automatic detection of lung nodules in low dose chest computed tomography scans ayman el baz and others 11 model based methods for detection of pulmonary nodules paulo rs mendonca rahul bhotika and robert kaucic 12