Adjustable clock frequency in an injector head assembly for an MRI system
An MRI system ( 100 ) is proposed (for generating one or more images of a body-part of a patient under analysis); the MRI system ( 100 ) comprises an injector head assembly ( 155 ), for injecting at least one medical fluid into the patient, having a clock unit ( 340 ) for providing a clock signal with a clock frequency. The MRI system ( 100 ) comprises means ( 420 - 425; 445 - 460 ) for adjusting the clock frequency in response to a manual command and/or to a detection of a degradation of the images. An injector system ( 155,165 ) for use in this MRI system ( 100 ) is also proposed. Moreover, a corresponding method ( 500 ) for managing the injector head assembly ( 155 ) is proposed. A computer program ( 400 ) for implementing the method ( 500 ) and a corresponding computer program product are also proposed.
1. An MRI system for generating one or more images of a body-part of a patient under analysis, wherein the MRI system comprises:
an injector head assembly configured for injecting at least one medical fluid into the patient, the injector head assembly including a control unit configured for controlling operation of the injector head assembly and a clock unit configured for providing a clock signal with a clock frequency to the control unit;
wherein the MRI system includes a memory structure storing an indication of a plurality of candidate values of the clock frequency, means for adjusting the clock frequency in an operative condition of the MRI system from a current value to a new value, and means for selecting the new value among the candidate values; and
wherein the means for adjusting include
means for entering an adjusting command manually and means for triggering the adjusting of the clock frequency in response to the adjusting command; and/or
means for monitoring the images generated by the MRI system, means for detecting a degradation of the images according to artifacts of the images, and further means for triggering the adjusting of the clock frequency in response to the degradation of the images.
2. The MRI system according to claim 1 , wherein the injector head assembly comprises the means for adjusting.
3. The MRI system according to claim 2 , wherein the injector head assembly comprises a keypad having a plurality of keys for entering commands for controlling operation of the injector head assembly, the means for entering the adjusting command being included in the keypad and the adjusting command consisting of a pre-defined combination of the keys.
4. The MRI system according to claim 1 , wherein the MRI system comprises a computing machine configured for controlling operation of the MRI system, the computing machine including the means for adjusting.
5. The MRI system according to claim 4 , wherein the means for adjusting comprises a further memory structure storing an indication of one or more known artifacts, the means for detecting the degradation including means for detecting the degradation according to a comparison of the images with the known artifacts.
6. The MRI system according to claim 1 , wherein the MRI system comprises means for measuring at least one operative parameter of the injector head assembly and means for validating the new value according to said at least one operative parameter.
7. The MRI system according to claim 6 , wherein said at least one operative parameter comprises a frequency of a communication port of the injector head assembly.
8. The MRI system according to claim 6 , wherein the MRI system comprises a driving device configured for driving the injector head assembly, the means for measuring being included in the driving device.
9. The MRI system according to claim 1 , wherein the memory structure stores a candidate list of the candidate values of the clock frequency.
10. The MRI system according to claim 1 , wherein the memory structure stores a candidate range of the clock frequency.
11. The MRI system according to claim 1 , wherein the clock frequency has a nominal value with a nominal tolerance, the candidate values being in a nominal range defined by the nominal value and the nominal tolerance.
12. The MRI system according to claim 1 , wherein the MRI system comprises means for generating magnetic pulses at a radio frequency, the new value having no harmonic frequencies matching the radio frequency.
13. The MRI system according to claim 1 , wherein the clock unit comprises an RC oscillator configured for generating the clock signal and wherein the means for adjusting comprises means for setting the RC oscillator according to the new value of the clock signal.
14. An injector system configured for use in the MRI system according to claim 1 , the injector system comprising said injector head assembly including said memory structure, said means for adjusting, and said means for selecting.
15. A computing machine configured for controlling operation of the MRI system according to claim 1 , the computing machine including said memory structure, said means for adjusting, and said means for selecting.
16. A method for managing an injector head assembly adapted to inject at least one medical fluid into a patient under analysis in an MRI system adapted to generate one or more images of a body-part of the patient, wherein the injector head assembly comprises a control unit configured for controlling operation of the injector head assembly and a clock unit configured for providing a clock signal with a clock frequency to the control unit ( 310 ), the method comprising:
adjusting the clock frequency in an operative condition of the MRI system from a current value to a new value; and
selecting the new value among a plurality of candidate values of the clock frequency from an indication thereof stored in a memory structure of the MRI system;
wherein said adjusting the clock frequency includes
entering an adjusting command manually and triggering the adjusting of the clock frequency in response to the adjusting command; and/o
monitoring the images generated by the MRI system, detecting a degradation of the images according to artifacts thereof and triggering the adjusting of the clock frequency in response to the degradation of the images.
17. The method according to claim 16 , wherein the method comprises:
adjusting the clock frequency from the current value to the new value under the control of the injector head assembly.
18. The method according to claim 17 , wherein the method comprises:
entering the adjusting command manually with a keypad of the injector head assembly having a plurality of keys for entering commands for controlling operation of the injector head assembly, the adjusting command consisting of a pre-defined combination of the keys of the keypad.
19. The method according to claim 16 , wherein the method comprises:
adjusting the clock frequency from the current value to the new value under the control of a computing machine for controlling operation of the MRI system.
20. The method according to claim 19 , wherein the method comprises:
detecting the degradation according to a comparison of the images with known artifacts stored in a further memory structure of the MRI system.
21. The method according to claim 16 , wherein the method comprises:
measuring at least one operative parameter of the injector head assembly, and
validating the new value according to said at least one operative parameter.
22. The method according to claim 21 , wherein said measuring at least one operative parameter comprises:
measuring a frequency of a communication port of the injector head assembly.
23. The method according to claim 21 , wherein said measuring at least one operative parameter comprises:
measuring said at least one operative parameter by a driving device configured for driving the injector head assembly.
24. The method according to claim 16 , wherein the method comprises:
selecting the new value from a list of the candidate values of the clock frequency stored in the memory structure.
25. The method according to claim 16 , wherein the method comprises:
selecting the new value from a candidate range of the clock frequency stored in the memory structure.
26. The method according to claim 16 , wherein the clock frequency has a nominal value with a nominal tolerance, the candidate values being in a nominal range defined by the nominal value and the nominal tolerance.
27. The method according to claim 16 , wherein the MRI system comprises means for generating magnetic pulses at a radio frequency, the new value having no harmonic frequencies matching the radio frequency.
28. The method according to claim 16 , wherein said adjusting the clock frequency comprises:
setting an RC oscillator for generating the clock signal according to the new value of the clock signal.
29. A tangible, non-transitory computer-readable medium storing program instructions that, when executed by a computing system, cause the computer system to perform the method according to claim 16 .