An algorithm for noise suppression in dual energy CT material density images
- 1 January 1988
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Medical Imaging
- Vol. 7 (3) , 218-224
- https://doi.org/10.1109/42.7785
Abstract
Dual-energy material density images obtained by prereconstruction-basis material decomposition techniques offer specific tissue information, but they exhibit relatively high pixel noise. It is shown that noise in the material density images is negatively correlated and that this can be exploited for noise reduction in the two-basis material density images. The algorithm minimizes noise-related differences between pixels and their local mean values, with the constraint that monoenergetic CT values, which can be calculated from the density images, remain unchanged. Applied to the material density images, a noise reduction by factors of 2 to 5 is achieved. While quantitative results for regions of interest remain unchanged, edge effects can occur in the processed images. To suppress these, locally adaptive algorithms are presented and discussed. Results are documented by both phantom measurements and clinical examples.Keywords
This publication has 10 references indexed in Scilit:
- Vertebral bone mineral analysis: an integrated approach with CT.Radiology, 1987
- Evaluation of a prototype dual‐energy computed tomographic apparatus. I. Phantom studiesMedical Physics, 1986
- The potential accuracy of dual-energy computed tomography for the determination of hepatic ironThe British Journal of Radiology, 1986
- Noise reduction methods for hybrid subtractionMedical Physics, 1984
- Measurement-Dependent Filtering: A Novel Approach to Improved SNRIEEE Transactions on Medical Imaging, 1983
- Quantification of calcium in solitary pulmonary nodules using single- and dual-energy CT.Radiology, 1982
- A Comparison of Noise and Dose in Conventional and Energy Selective Computed TomographyIEEE Transactions on Nuclear Science, 1979
- Quantitative Bone Mineral Analysis Using Dual Energy Computed TomographyInvestigative Radiology, 1977
- Energy-selective reconstructions in X-ray computerised tomographyPhysics in Medicine & Biology, 1976
- Measurement of effective atomic number and electron density using an EMI scannerNeuroradiology, 1976