Figure 7From: Does quantitative lung SPECT detect lung abnormalities earlier than lung function tests? Results of a pilot studyDensity curves for a phantom lung with heterogeneities, with decreasing activity levels. Density curves based on three decreasing average number of 99mTc particles per unit volume are shown, with the highest (left solid line), middle (centre dotted line) and the lowest (right dashed line).Back to article page