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Keywords:
Radioprotection / Radiation dose, Lung, CT, Computer Applications-General, Comparative studies, Dosimetric comparison
Authors:
C. C. Brussaard1, B. Ilsen1, J. Milles2, W. Giepmans2, J. de Mey1; 1Brussels/BE, 2Eindhoven/NL
DOI:
10.1594/ecr2015/B-0106
Results
IMR-low dose is superior to standard CT-scan in detecting and delineating ground glass nodules (L2 4.8 ± 0.4).
Only one patient showed emphysema,
remarkably well seen on IMR and barely seen on conventional CT. IMR-low dose showed at least acceptable image quality for detection of small pulmonary vessels (L1/L2 3.7 ± 0.5) and delineation of the pleura (L1 4.1 ± 0.5) and mediastinal wall (L1 3.8 ± 0.4).
This result is due to the very drastic reduction in image noise and artifacts by the new developped model-based iterative reconstruction.
IMR-low dose provided an acceptable average image quality for the delineation of the fissures (L1 3.2 ± 0.9).
The delineation of bronchial walls within 3 cm of the chest wall was considered insufficient (L1 2.4 ± 0.5).
The study highlighted also that in our institution ground glass nodules and areas with mosaic perfusion are suboptimally seen in clinical practice (standard care: 2.2 ±1.3,
50% of standard care 1.7 ± 1.4).
The low-dose reconstructed with IMR made this pathology again clearly visible.