Compression of Medical Images in Radiotherapy
Gordan Ni © Eviæ, Vojislav Josimoviæ · 2001
he main reasons for the compression radiotherapy and more generally medical images are transmission, storage and archiving costs (1). There are many algorithms for image compression: lossless which are fully reversible with no loss of data or lossy where there is a loss of data but the file sizes are smaller. The results of the compression of the scanned simulator radiographic film, and portal image obtained with Electronic Portal Imaging Device (EPID) (Figure 1) during the treatment with linear accelerator, are presented in this paper. There is an increasing demand for the implementation of radiotherapy imaging in routine patient treatment to obtain both the quality assurance of field alignment and documentation of actually given radiation treatments (2).