From: Quantitative lung SPECT applied on simulated early COPD and humans with advanced COPD
Distribution notation | Coronal slice | Number | Distribution description | Total reduction of ventilation (%) | |
---|---|---|---|---|---|
Simulated normal | Uniform |
| 1 | Homogeneous activity distribution | 0 |
Simulated COPD | 1 cm50% 10% evenly |
| 2 | Lesions with a diameter of 1 cm with 50% activity concentration, evenly distributed over the lung volume, occupying 10% of the total lung volume. | 5 |
1 cm50% 12% centred |
| 3 | Lesions with a diameter of 1 cm with 50% activity concentration, centred to the large bronchial tubes, occupying 12% of the total lung volume. | 6 | |
1 cm0% 10% evenly |
| 4 | Lesions with a diameter of 1 cm with 0% activity concentration, evenly distributed over the lung volume, occupying 10% of the total lung volume. | 10 | |
1 cm0% 12% centred |
| 5 | Lesions with a diameter of 1 cm with 0% activity concentration, centred to the large bronchial tubes, occupying 12% of the total lung volume. | 12 | |
2 cm50% 10% evenly |
| 6 | Lesions with a diameter of 2 cm with 50% activity concentration, evenly distributed over the lung volume, occupying 10% of the total lung volume. | 5 | |
2 cm0% 10% evenly |
| 7 | Lesions with a diameter of 2 cm with 0% activity concentration, evenly distributed over the lung volume, occupying 10% of the total lung volume. | 10 | |
2 cm50% 48% evenly |
| 8 | Lesions with a diameter of 2 cm with 50% activity concentration, evenly distributed over the lung volume, occupying 48% of the total lung volume. | 24 | |
2 cm25% 48% evenly |
| 9 | Lesions with a diameter of 2 cm with 25% activity concentration, evenly distributed over the lung volume, occupying 48% of the total lung volume. | 36 |