A METHOD AND SYSTEM FOR ERROR RESILIENT COMPRESSION AND DECOMPRESSION OF COMPUTED TOMOGRAPHY DATA

摘要

Disclosed herein are methods and systems for transferring data from a rotating data source such as an X-ray scanner to a stationary target such as a central processing unit over a slip ring. Data received from the data source is compressed on the rotor by a compressor attached to a memory buffer for data retention in the event that the slip ring capacity is below the required data rate. On the stationary platform a decompressor resides which may decompress data back into its original form and transmit it to the target over a network. A memory buffer is attached to the decompressor for the event that data needs to be accumulated when the network or target cannot handle the rate of data to be sent. The compressor comprises of a predictor unit, an entropy encoder unit and an error protector unit. The predictor may use stored data as reference from a set of frames and locations within them. The encoding of the locations may be by means of a Golomb- Rice encoded integer. The entropy encoder may encode differences by means of Golomb- Rice encoding with a parameter K which may vary for each group of data units or it may keep data in its original format for purposes of data reduction or error protection. The error protector may protect parameters inserted into the data stream by means of an error protection code while most of the data can remain without protection.