To determine the capability of Iterative Model Reconstruction (IMR-Philips) as dose reducing method in clinical practice.
Methods and materials
CT-scan of the thorax (iCT Philips Healthcare,
The Netherlands) was performed with standard care (120 kV,
thickness 0.9 mm,
reconstruction interval 0.7 mm) and low dose (50% of initial dose) in 10 patients over 65 years old.
The images we interpretated at a thickness of 3 mm.
The low dose CT-scan was also reconstructed with a prototype model-based reconstructor (IMR,
Philips) using filter Body Sharp Plus level 1 and 2 (thickness 1 mm).
Level 2 provides more noise reduction than level 1....
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 ofsmall 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...
The demand for dose reduction pushes the radiologist to lower the dose.
This tendency may end in a loss of diagnostic quality,
if only statistical iterative reconstruction levels are used.
The pathology mostly affected by lowering the dose in CT thorax are ground glass nodules,
Iterative model-based reconstruction shows a potential to recover this pathology at low dose levels,
making it possible to scan more savely at low dose levels.
iterative model-based reconstruction shows a potential as dose reducing reconstruction...
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