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Abstract
Multi–detector row CT of the chest has revolutionized the evaluation of diffuse lung disease. Two-dimensional reformatted images are now of equal importance with the 2D axial images in making the final diagnosis. mIP is the tool of choice for the detection, assessment of distribution, evaluation of extent, and characterization of linear or ground-glass attenuation and mosaic perfusion. MIP allows the recognition of pulmonary edema in cases of linear attenuation associated with enlarged pulmonary veins. Moreover, mosaic perfusion may be differentiated from mosaic attenuation on the basis of vessel size. MIP permits the detection and characterization of micronodules and differentiation between perilymphatic, miliary, and centrilobular distribution. MIP can also help differentiate between constrictive bronchiolitis and mixed emphysema. In the future, 3D reformatted images could be used to quantify these diffuse disorders.