Enhancement of MR Images Using Registration for Signal Averaging
- 1 March 1998
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Computer Assisted Tomography
- Vol. 22 (2), 324-333
- https://doi.org/10.1097/00004728-199803000-00032
Abstract
Purpose: With the advent of noninvasive neuroimaging, a plethora of digital human neuroanatomical atlases has been developed. The accuracy of these atlases is constrained by the resolution and signal-gathering powers of available imaging equipment. In an attempt to circumvent these limitations and to produce a high resolution in vivo human neuroanatomy, we investigated the usefulness of intrasubject registration for post hoc MR signal averaging. Method: Twenty-seven high resolution (7 × 0.78 and 20 × 1.0 mm3) T1-weighted volumes were acquired from a single subject, along with 12 double echo T2/proton density-weighted volumes. These volumes were automatically registered to a common stereotaxic space in which they were subsampled and intensity averaged. The resulting images were examined for anatomical quality and usefulness for other analytical techniques. Results: The quality of the resulting image from the combination of as few as five T1 volumes was visibly enhanced. The signal-to-noise ratio was expected to increase as the root of the number of contributing scans to 5.2, n = 27. The improvement in the n = 27 average was great enough that fine anatomical details, such as thalamic subnuclei and the gray bridges between the caudate and putamen, became crisply defined. The gray/white matter boundaries were also enhanced, as was the visibility of any finer structure that was surrounded by tissue of varying T1 intensity. The T2 and proton density average images were also of higher quality than single scans, but the improvement was not as dramatic as that of the T1 volumes. Conclusion: Overall, the enhanced signal in the averaged images resulted in higher quality anatomical images, and the data lent themselves to several postprocessing techniques. The high quality of the enhanced images permits novel uses of the data and extends the possibilities for in vivo human neuroanatomy.Keywords
This publication has 30 references indexed in Scilit:
- An elastic computerized brain atlas for the analysis of clinical PET/SPET dataEuropean Journal of Nuclear Medicine and Molecular Imaging, 1995
- Brain atlases - a new research toolTrends in Neurosciences, 1994
- The Young Adult Human Brain: An MRI-based Morphometric AnalysisCerebral Cortex, 1994
- Mathematical textbook of deformable neuroanatomies.Proceedings of the National Academy of Sciences, 1993
- Elastically Deforming 3D Atlas to Match Anatomical Brain ImagesJournal of Computer Assisted Tomography, 1993
- Three-Dimensional Whole-Brain MappingStereotactic and Functional Neurosurgery, 1992
- Warping of a computerized 3-D atlas to match brain image volumes for quantitative neuroanatomical and functional analysisPublished by SPIE-Intl Soc Optical Eng ,1991
- A Computerized Brain AtlasJournal of Computer Assisted Tomography, 1991
- A computerized adjustable brain atlasEuropean Journal of Nuclear Medicine and Molecular Imaging, 1989
- Anatomical-Functional Correlation Using an Adjustable MRI-Based Region of Interest Atlas with Positron Emission TomographyJournal of Cerebral Blood Flow & Metabolism, 1988