FULL DUPLEX COMMUNICATION ON SINGLE LINE TO REDUCE NUMBER OF DATA SLIP RINGS
Publication Date: 2015-Nov-26
The IP.com Prior Art Database
A technique of reducing number of slip rings for data communication in a medical imaging system is disclosed The technique combines all three signals in a single physical data line using an encoding and decoding method A protective earth connected slip ring is used as return path for current flowing in the data line Implementation of reduced number of slip rings does not affect communication protocol or physical layer of implementation The technique enables full duplex communication on a single physical line
The present invention relates generally to a medical imaging system and more particularly to a technique for reducing number of slip rings for data communication in a medical imaging system.
Generally, a medical imaging system, such as a CT system, requires dedicated data lines from a stationary to a rotating side and back for effective data communication. Number of slip rings in the imaging system is determined by number of physical data lines required as slip rings are used to communicate data between stationary and rotating part of a gantry. In a conventional CT system, generally four data lines are used for data communication. Two data lines are required for signals travelling from stationary to rotating side and another two data lines are required for signals travelling from rotating to stationary side. Figure 1 depicts the conventional communication assembly design utilizing four dedicated to slip rings.
Each slip ring adds to cost of the communication assembly used in the CT system. Further, high number of slip rings adds to cost of maintenance as brushes in the slip rings wear out periodically.
In another conventional technique, power line communication (PLC) method is used for data transfer between stationary and rotating sides. However, PLC method does not have optimal bandwidth for high frequency signal. The direct current (DC) power line has high capacitance and driving the high frequency signal over the DC power line is difficult. Also, only one signal can be sent using PLC which reduces only one slip ring from the conventional four slip rings design.
One other conventional technique employs data compression and decompression. The bandwidth of the conventional slip ring is limited and the slip rings cannot take any higher frequency than the conventional frequency used. Compressing every three signals implies that data rate is increased by at least three times. However, the slip ring does not support such high bandwidth data rate.
Yet another conventional technique employs a digital transceiver for full-duplex transmission of binary signals over a common line. The technique uses a multiplexer and two inverting drivers with a specific threshold voltage. However, the technique can only transmit and decode two signals on same transmission line as compared to required three or four signals.
It would be desirable to have a technique to reduce number of slip rings for data communication in the medical imaging system without affecting bandwidth of signal transfer adversely.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 depicts a conventional communication assembly design utilizing four dedicated slip rings.
Figure 2 depicts a communication assembly design using a single dedicated slip ring.
Figure 3 depicts a block diagram of stationary side and rotating side circuits elaborating return path through earth connection.
Figure 4 depicts a block diagram...