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Proceedings Paper

PCA based spatio-temporal decomposition and compression of 4D medical images
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Paper Abstract

The amount of per-patient image data generated by medical imaging modalities such as MRI and multi-slice CT scanners increases rapidly. This is on one hand due to an increasing spatial image resolution and on the other hand due to the expanding use of multi-phase or cine studies. A cardiac multi-phase CT scan, generated in about 20 seconds scan time, easily generates about 2GB of image data. The visualization and further processing of those data is at the edge of the abilities of current computers. We therefore present a principal component analysis (PCA) based compression algorithm, which exploits the spatial and temporal coherence of medical multi-phase image data and which allows to retrieve the images with a selectable amount of information loss. The main focus of this work is to reduce the required amount of system memory, not to reduce the required amount of disk space, i.e. at any time only the decomposed image resides in the system memory. If an intensity value for a position (x,y,z,t) is required, it is calculated on demand. This is possible, since the intensity values are expressed as fast computable weighted sums. The method has been applied to cardiac multi-phase CT datasets. It could be shown that a compression ratio of 3:1 still keeps the compression-induced losses (mainly blurring) at the noise level of the original data (about 5 Hounsfield units). Compression ratios of 5:1 and more can be achieved keeping an undisturbed visual impression of the dataset. The influence of the image compression on an automated cardiac segmentation procedure has been studied. Compression ratios up to 8:1 lead to results that only marginally deviate from results of the uncompressed image.

Paper Details

Date Published: 15 April 2005
PDF: 10 pages
Proc. SPIE 5748, Medical Imaging 2005: PACS and Imaging Informatics, (15 April 2005); doi: 10.1117/12.595257
Show Author Affiliations
Cristian Lorenz, Philips Research Labs. (Germany)
Jens von Berg, Philips Research Labs. (Germany)

Published in SPIE Proceedings Vol. 5748:
Medical Imaging 2005: PACS and Imaging Informatics
Osman M. Ratib; Steven C. Horii, Editor(s)

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