Method and system for data transmission in a CT device, with integrated error monitoring and diagnosis

• US 20050005206A1
• Filed: 05/14/2004
• Published: 01/06/2005
• Est. Priority Date: 05/16/2003
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Popescu, Stefan
• Granted Patent: US 7,240,251 B2
• Time in Patent Office: Days
• US Class Current: 714/704
• CPC Class Codes: A61B 6/56 Details of data transmission or power supply, e.g. use of slip rings
• CPC Class Codes: H04L 1/24 Testing correct operation
• CPC Class Codes: H05G 1/54 Protecting or lifetime predictionoverload protection combined with control H05G1/46

Abstract

In a system and an associated method, for data transmission in a computed tomography device, having a data acquisition unit in which measurement data are acquired, converted into a bit stream, and communicated to a transmitter apparatus on a rotating part of the computed tomography device, wherein the transmitter transmits the bit stream to a stationary part of the computed tomography device, and having a receiver apparatus on the stationary part that receives the bit stream from the transmitter apparatus and communicates it to an image reconstruction unit that further processes the bit stream communicated by the receiver apparatus for the reconstruction of the image, the transmitter apparatus and the receiver apparatus each have an error recognition module that monitors the bit stream for errors and signals recognized errors to an error processor that determines the number and rate and/or duration of the recognized errors and stores these in a log data file for an evaluation. Errors thus can be recognized in real time and can be used for error diagnosis without the use of an additional testing tool.

Claims

1. In a computed tomography device having a data acquisition unit in which measurement data are acquired and converted into a bit stream and communicated to a transmitter apparatus situated on a rotating part of the computed tomography device, the transmitter apparatus transmitting the bit stream to a stationary part of the computed tomography device, and having a receiver apparatus situated on the stationary part for receiving the bit stream from the transmitter apparatus and for communicating the bit stream to an image reconstruction unit for reconstructing an image from the bit stream, the improvement of a data transmission system comprising:

a first error recognition module disposed in said transmitter apparatus and a second error recognition module disposed in said receiver apparatus, each of said first and second error recognition modules monitoring said bit stream for errors and, upon detection of an error, generating an error signal; and

an error processor in communication with said first and second error recognition modules and supplied with said signals therefrom for determining a quantity selected from the group consisting of an error number, an error rate and an error duration, and for storing said quantity in a log data file for evaluation.

2. The improvement of claim 1 wherein said bit stream contains CRC codes, and wherein each of said first and second error recognition modules comprises a module for monitoring said CRC codes.

3. The improvement of claim 1 wherein said bit stream has a signal level associated therewith, and wherein each of said first and second error recognition modules comprises a module for monitoring said signal level.

4. The improvement of claim 1 wherein said bit stream contains a clock signal, and wherein each of said first and second error recognition modules comprises a module for monitoring recoverability of said clock signal.

5. The improvement of claim 1 further comprising an error recognition module disposed in said image reconstruction unit.

6. The improvement of claim 1 comprising a bit pattern generator disposed in said data acquisition unit for, upon an entered command, producing an evaluatable bit pattern for conversion and transmission.

7. The improvement of claim 6 comprising an error analysis module in said image reconstruction unit for analyzing said quantity in said log data file in combination with said bit pattern from said data acquisition unit.

8. The improvement of claim 7 wherein said error analysis module determines a bit error rate for predicting a quality of a data connection proceeding from said data acquisition unit to said image reconstruction unit in a plurality of different operating modes of said computed tomography device.

9. The improvement of claim 8 wherein said error analysis module conducts an evaluation for identifying errors if said bit error rate exceeds a predetermined threshold value.

10. The improvement of claim 7 wherein said error analysis module detects systematic bit errors and burst errors.

11. The improvement of claim 7 wherein said error analysis module detects random bit errors and burst errors.

12. The improvement of claim 7 wherein said error analysis module detects at least one of position-related errors and pattern-sensitive errors.

13. The improvement of claim 1 wherein said error processor generates a warning message if said quantity exceeds a predetermined threshold.

14. The improvement of claim 1 comprising a first visual indicator connected to said first error recognition module for providing a visual indication if an error in said bit stream is recognized by said first error recognition module, and a second visual indicator connected to said second error recognition module for providing a visual indication if an error in said bit stream is detected by said second error recognition module.

15. The improvement of claim 14 wherein each of said first and second visual indicators comprises a light-emitting diode that is illuminated when said error in said bit stream is detected.

16. A method for monitoring data transmission in a computed tomography device wherein measurement data are acquired in a data transmission unit and are converted into a bit stream and communicated to a transmitter apparatus on a rotating part of the computed tomography apparatus, from which the bit stream is transmitted to a receiver apparatus situated on a stationary part of the computed tomography apparatus, and wherein said receiver apparatus communicates the bit stream to an image reconstruction unit for reconstructing an image from the bit stream, comprising the steps of:

in said transmitter apparatus and in said receiver apparatus, monitoring said bit stream in real time for errors; and

storing a quantity associated with said errors selected from the group consisting of an error number, an error and an error duration, in a log file for evaluation.

17. A method as claimed in claim 16 wherein said bit stream contains CRC codes, and wherein the step of monitoring said bit stream for errors comprises monitoring said CRC codes.

18. A method as claimed in claim 16 wherein said bit stream has a signal level associated therewith, and wherein the step of monitoring said bit stream for errors comprises monitoring said signal level.

19. A method as claimed in claim 16 wherein said bit stream contains a clock signal, and wherein the step of monitoring said bit stream for errors comprises monitoring recoverability of said clock signal.

20. A method as claimed in claim 16 comprising also monitoring said bit stream for errors in said image reconstruction unit.

21. A method as claimed in claim 16 wherein, upon an entered command, generating a predetermined bit pattern in said data acquisition unit and converting said bit pattern into said bit stream, and transmitting said bit stream.

22. A method as claimed in claim 21 comprising analyzing said bit pattern in said bit stream for errors in said image reconstruction unit.

23. A method as claimed in claim 16 comprising, from said quantity stored in said log data file, generating a quantitative prediction of a quality of a data connection proceeding from data acquisition unit to said image reconstruction unit in a plurality of different operating modes of said computed tomography device.

24. A method as claimed in claim 23 comprising, if a threshold value for said bit error rate is exceeded, generating a histogram representing a distribution of lengths of error bursts and a distribution of lengths of error-free intervals.

25. A method as claimed in claim 23 comprising, if a threshold value for said bit error rate is exceeded, generating a histogram representing a number of errors dependent on an associated position of said rotating part.

26. A method as claimed in claim 23 comprising, if a threshold value for said bit error rate is exceeded, generating a histogram representing a number of errors dependent on the bit position within transmitted bit words.

27. A method as claimed in claim 23 comprising, if a threshold value for said bit error rate is exceeded, generating a histogram representing a number of errors dependent on a position of an erroneous word within transmitted data packets.

28. A method as claimed in claim 16 comprising, if a predetermined threshold value for said quantity is exceeded, generating a warning message.