CN103869268A - Coil testing device, magnetic resonance system, and output correction methods and devices for coil testing device and magnetic resonance system - Google Patents
Coil testing device, magnetic resonance system, and output correction methods and devices for coil testing device and magnetic resonance system Download PDFInfo
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- CN103869268A CN103869268A CN201210552668.8A CN201210552668A CN103869268A CN 103869268 A CN103869268 A CN 103869268A CN 201210552668 A CN201210552668 A CN 201210552668A CN 103869268 A CN103869268 A CN 103869268A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
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Abstract
The invention discloses a coil testing device, a magnetic resonance system, and output correction methods and output correction devices for the coil testing device and the magnetic resonance system. The output correction method for the coil testing device comprises the following steps: when a load is not connected to an output port of the coil testing device, sampling a signal of the output port to obtain first correction data; connecting an adjustable load and a measuring instrument to the output port; adjusting the adjustable load to enable the reading of the measuring instrument to be a preset value, and sampling the signal of the output port to obtain second correction data; establishing a correction function corresponding to the output port; during measurement, sampling the signal of the output port to obtain sampling data corresponding to the signal of the output port; calling the correction function corresponding to the output port to obtain a parameter value of the signal of the output port. According to the output correction method and the output correction device for the coil testing device, provided by the technical scheme, the accuracy of a correction result, the correction efficiency and the safety of codes needing to be encrypted are improved.
Description
Technical field
The present invention relates to mr imaging technique field, particularly a kind of coil measurement device, magnetic resonance system and output calibration method and apparatus thereof.
Background technology
Magnetic resonance imaging (MRI, Magnetic Resonance Imaging) as the key areas of nuclear magnetic resonance application, because it has fabulous resolving power, imaging parameters that abundant diagnostic message can be provided, human body be there is no to the plurality of advantages such as ionization radiation injury human body soft tissue, magnetic resonance imaging system has become one of main tool of medical clinic applications.As the core component that receives signal in magnetic resonance system, radio-frequency coil is before directly contact human body uses, need to utilize coil measurement device to comprise such as the performance test such as transport property, coil-type coil, guarantee that the coil after performance test normally uses.
In the time utilizing coil measurement device to test coil or utilize coil to test human body, need multichannel electric current and the voltage of the output of measuring coil proving installation or magnetic resonance system, using the current value measuring and magnitude of voltage as judge whether normally one of standard of coil state.Due to the existence of components and parts difference, between the electric current obtaining and the measured value of voltage and actual value, there is some difference in meeting, the adverse effect of by components and parts difference, circuit measuring result being brought in order to eliminate this kind, need to proofread and correct the output of coil measurement device, electric current and the voltage of coil measurement device or magnetic resonance system output be proofreaied and correct.
In prior art, to the output calibration method of coil measurement device be: measure and set up the needed parameter of correction function; By in described parameter read-in code; Utilization writes the parameter of code and sets up correction function; When the electric current of exporting in actual measurement and voltage, call correction function, obtain the parameter value of coil measurement device output port.The electric current of exporting taking correcting coil proving installation is as example, first, output port access pull-up resistor and the reometer of the coil measurement device of proofreading and correct at needs, shown in figure 1, the output port that the pull-up resistor 11 of series connection and reometer 12 1 terminations need to be proofreaied and correct, other end ground connection.Read the current value of reometer 12 under this state, this current value is calibration reference current value i
0, and obtain calibration reference current value i
0the correction sampled data I of correspondence after current/voltage-converted and analog to digital conversion
0.To proofread and correct reference current value i
0with correction sampled data I
0write in code, and set up correction function: i
x: i
0=I
x: I
0, wherein, i
xrepresent the current value of output port, I
xrepresent the current value i of output port
xcorresponding sampled data.When the electric current of Dui Ci road output port is measured, obtain the current value i of output port
xcorresponding sampled value I
x, by calling correction function: i
x: i
0=I
x: I
0, just can obtain the current value i of output port
x.
But, utilize said method to proofread and correct and there is following shortcoming the output of coil measurement device: in reality is proofreaied and correct, to find, the measured value accuracy obtaining after utilizing said method to current correction is lower, because components and parts difference still can produce considerable influence to circuit measuring result; Coil measurement device has multichannel electric current and Voltage-output, all will repeat respectively above-mentioned steps to the measurement on each road, and correction efficiency is lower; To the measurement on each road, need to reference current value i will be proofreaied and correct
0with correction sampled data I
0write in code, therefore, need to code is open, reduce the security of the code to need to be keep secret.
More technical schemes about data correcting method in magnetic resonance system can application reference number be 200910254204.7, denomination of invention is the Chinese patent application file of the method and apparatus for determining distortion correction data.
Summary of the invention
What the present invention solved is that the correction result precision that the output calibration of coil measurement device is produced is low, correction depends on code and proofreaies and correct inefficient problem.
For addressing the above problem, the invention provides a kind of output calibration method of coil measurement device, the output calibration method of described coil measurement device comprises: in the time that the output port of coil proving installation does not access load, the signal of described output port is sampled, obtain the first correction data; At described output port access tunable load and measurement instrument; Adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data; Set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value; In the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port; Call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
Optionally, described tunable load is adjustable resistance.
Optionally, the signal of described output port is current signal.
Optionally, described measurement instrument is reometer, and described reometer is connected with described tunable load.
Optionally, the described signal to described output port is sampled and is comprised the signal of described output port is carried out to current/voltage-converted and analog to digital conversion.
Optionally, the signal of described output port is voltage signal.
Optionally, described measurement instrument is voltage table, and described voltage table is in parallel with described tunable load.
Optionally, the described signal to described output port is sampled and is comprised the signal of described output port is carried out to analog to digital conversion.
For addressing the above problem, the present invention also provides a kind of output compensator of coil measurement device, the output compensator of described coil measurement device comprises: sampling unit, signal for the output port to coil measurement device is sampled, and obtains the sampled data corresponding to signal of described output port; Storage unit, for storing the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent the first correction data, A
1represent the second correction data, N represents predetermined value; Described the first correction data is described output port while not accessing load, the sampled data corresponding to signal of the described output port that described sampling unit obtains; Described the second correction data is adjusted described tunable load after being described output port access tunable load and measurement instrument, while making the reading of described measurement instrument be described predetermined value, and the sampled data corresponding to signal of the described output port that described sampling unit obtains; Control module, for controlling the work of described sampling unit and described storage unit, and in the time measuring, the sampled data corresponding to signal of the described output port obtaining according to described sampling unit, call the correction function corresponding to described output port of described cell stores, to obtain the parameter value of signal of described output port.
Optionally, also comprise: switch element, under the control of described control module, so that described tunable load and measurement instrument access described output port or make described tunable load and measurement instrument and described output port disconnect.
Output calibration method and apparatus based on above-mentioned coil measurement device, the embodiment of the present invention also provides a kind of coil measurement device, described coil measurement device comprises the test cell for coil is tested, and also comprises the output compensator of above-mentioned coil measurement device.
Output calibration method and apparatus based on above-mentioned coil measurement device, the embodiment of the present invention also provides a kind of output calibration method of magnetic resonance system, the output calibration method of described magnetic resonance system comprises: in the time that the output port of magnetic resonance system does not access load, signal to described output port is sampled, and obtains the first correction data; At described output port access tunable load and measurement instrument; Adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data; Set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value; In the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port; Call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
Output calibration method based on above-mentioned magnetic resonance system, the embodiment of the present invention also provides a kind of output compensator of magnetic resonance system, the output compensator of described magnetic resonance system comprises: sampling unit, signal for the output port to magnetic resonance system is sampled, and obtains the sampled data corresponding to signal of described output port; Storage unit, for storing the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent the first correction data, A
1represent the second correction data, N represents predetermined value; Described the first correction data is described output port while not accessing load, the sampled data corresponding to signal of the described output port that described sampling unit obtains; Described the second correction data is adjusted described tunable load after being described output port access tunable load and measurement instrument, while making the reading of described measurement instrument be described predetermined value, and the sampled data corresponding to signal of the described output port that described sampling unit obtains; Control module, for controlling the work of described sampling unit and described storage unit, and in the time measuring, the sampled data corresponding to signal of the described output port obtaining according to described sampling unit, call the correction function corresponding to described output port of described cell stores, to obtain the parameter value of signal of described output port.
Output calibration method and apparatus based on above-mentioned magnetic resonance system, the embodiment of the present invention also provides a kind of magnetic resonance system, and described magnetic resonance system comprises coil, also comprises the output compensator of above-mentioned magnetic resonance system.
Compared with prior art, the output calibration method and apparatus of the coil measurement device that technical solution of the present invention provides has following beneficial effect: when coil measurement device output port does not access load, due to the existence of output port internal load power consumption and other losses, there is electric current to flow through the sample resistance in sampling unit, to the electric current of output port the first correction data that obtains non-vanishing of sampling, therefore, in the time setting up correction function corresponding to output port, when correction function is not accessed to load with output port, the signal of output port described the first correction data obtaining of sampling is associated, in the time measuring, call the measured value accuracy that described correction function obtains after to current correction high, the output calibration method and apparatus of the coil measurement device that use technical solution of the present invention provides, can export and proofread and correct coil measurement device multichannel simultaneously, has improved correction efficiency, do not need correction data to write in code at timing, therefore, without code is open, the security that has improved the code to need to be keep secret.
Brief description of the drawings
Fig. 1 is the structural representation that the existing output port to coil measurement device is proofreaied and correct access pull-up resistor and reometer;
Fig. 2 is the schematic flow sheet of the output calibration method of embodiment of the present invention coil measurement device;
Fig. 3 is the structural representation of the output compensator of the coil measurement device of the embodiment of the present invention;
Fig. 4 is the structural representation that in the embodiment of the present invention 1, tunable load is connected with measurement instrument;
Fig. 5 is the structural representation that the output port internal load of embodiment of the present invention coil measurement device is connected with dynamic load;
Fig. 6 is the structural representation that in the embodiment of the present invention 2, tunable load is connected with measurement instrument.
Embodiment
Just as described in the background art, use the output calibration method of existing coil measurement device to carry out timing to electric current, the measured value accuracy obtaining is lower.The inventor of the technical program is through research discovery, and existing bearing calibration is (the current value i of described output port in the time that current output terminal does not connect load
xbe zero), utilize described correction function: i
x: i
0=I
x: I
0the current value i of the described output port obtaining
xcorresponding sampled data I
xalso should be zero, but in actual conditions, due to the existence of described output port internal load power consumption and other losses, have electric current to flow through sample resistance, described in treat the current value i of output port
xcorresponding sampled data I
xand non-vanishing, therefore, cause the measured value accuracy to obtaining after current correction lower.Technical solution of the present invention provide a kind of proofread and correct result precision high, proofread and correct the output calibration method and the device that do not rely on code and proofread and correct the high coil measurement device of efficiency.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, implemented but the present invention can also adopt other to be different from alternate manner described here, therefore the present invention is not subject to the restriction of following public specific embodiment.
Fig. 2 is the schematic flow sheet of the output calibration method of embodiment of the present invention coil measurement device.With reference to figure 2, the output calibration method of described coil measurement device comprises:
Step S21: in the time that the output port of coil proving installation does not access load, the signal of described output port is sampled, obtain the first correction data;
Step S22: at described output port access tunable load and measurement instrument;
Step S23: adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data;
Step S24: set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value;
Step S25: in the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port;
Step S26: call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
Output calibration method based on above-mentioned coil measurement device, the embodiment of the present invention also provides a kind of output compensator of coil measurement device, the structural representation of the output compensator of coil measurement device shown in Figure 3, the output compensator of described coil measurement device comprises:
Control module 33, for controlling the work of described sampling unit 31 and described storage unit 32, and in the time measuring, the sampled data corresponding to signal of the described output port 30 obtaining according to described sampling unit 31, call the correction function of described output port 30 correspondences that described storage unit 32 stores, to obtain the parameter value of signal of described output port 30.
The output compensator of described coil measurement device also comprises switch element 34, under the control of described control module 33, so that described tunable load and measurement instrument 35 access described output port 30 or make described tunable load and measurement instrument 35 disconnects with described output port 30.
For better embodiments of the present invention being understood, the output calibration method below in conjunction with accompanying drawing and specific embodiment to technical solution of the present invention coil measurement device and the principle of work of device are described in detail.
Embodiment 1
In the present embodiment, be described as example taking the current value of the signal of measuring described output port, Fig. 4 is the structural representation that in the present embodiment, tunable load is connected with measurement instrument.With reference to figure 4, in the time utilizing coil measurement device to test coil, there is the electric current output of multichannel, therefore, described tunable load and measurement instrument are also to there being many groups.In the present embodiment, described tunable load is adjustable resistance, described measurement instrument is reometer, described tunable load and measurement instrument have n group, each group comprises that the adjustable resistance of series connection (is respectively adjustable resistance 1, adjustable resistance 2, adjustable resistance n) and measurement instrument (be respectively reometer A1, reometer A2, reometer A3), one end ground connection of the tunable load of described series connection and measurement instrument, the other end is that connectivity port (is respectively connectivity port P1, connectivity port P2, connectivity port Pn), described connectivity port is connected with the switch element 34 shown in Fig. 3.Because the bearing calibration of each road output current is identical, be elaborated with the bearing calibration of the current value of the signal of the adjustable resistance 1 of connecting described in Fig. 4 and described output port corresponding to reometer A1 below in conjunction with accompanying drawing.
As described in step S21, in the time that the output port of coil proving installation does not access load, the signal of described output port is sampled, obtain the first correction data.
With reference to figure 3, control described switch element 34 in off-state by described control module 33, the output port 30 of described coil measurement device does not access adjustable resistance 1 and the reometer A1 of described series connection, described sampling unit 31 is sampled to the current signal of described output port 30 under the control of described control module 33, obtains the first correction data A
0.Particularly, described switch element 34 can be mechanical switch, also can be for being subject to the switching tube of electric signal control, for example switching transistor, accordingly, the control signal that described control module 33 is exported can be the information showing on display panel, can be also the voltage signal of controlling.In the present embodiment, because being samples to current signal, described sampling unit 31 comprises current/voltage-converted unit and AD conversion unit, described current/voltage-converted unit is for the current signal of described output port 30 is converted to voltage signal, and described AD conversion unit is for being converted to described the first correction data A by described voltage signal
0.
As described in step S22, at described output port access tunable load and measurement instrument.
Particularly, control described switch element 34 in conducting state by described control module 33, make described output port 30 access adjustable resistance 1 and the reometer A1 of described series connection.
As described in step S23, adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data.
Particularly, adjust described adjustable resistance 1, in the process of adjusting, observe the reading of described reometer A1, in the time that the reading of described reometer A1 reaches predetermined value N, stop adjusting described adjustable resistance 1, control described sampling unit 31 by described control module 33 current signal of described output port 30 is sampled, obtain the second correction data A
1.Described predetermined value N can be a predefined current value, need to determine according to practical application, and in the present embodiment, described predetermined value N is 120mA.
As described in step S24, set up the correction function that described output port is corresponding.
Fig. 5 is the structural representation that output port 30 internal loads are connected with dynamic load described in the present embodiment.With reference to figure 5, described output port 30 internal load power consumptions and other power consumptions are equivalent to the power attenuation of internal load 51.Do not access the adjustable resistance 1 in dynamic load 52(that is the present embodiment at described output port 30) time, due to the existence of described internal load 51, there is internal consumption current i through sample resistance 50, in connectivity port, P place obtains magnitude of voltage, and described connectivity port P is connected with described AD conversion unit.After analog to digital conversion, obtain described the first correction data: A at described sampling unit 31
0=a*i, a is first conversion coefficient of described internal consumption current i through described current/voltage-converted unit and described AD conversion unit.Access the adjustable resistance 1 in dynamic load 52(that is the present embodiment at described output port 30) time, described the second correction data: A obtained at described sampling unit 31
1=a*i+b*I, I is the load current that flows through described dynamic load 52, i.e. described predetermined value N in the present embodiment, b is second conversion coefficient of described load current I through described current/voltage-converted unit and described AD conversion unit.In the time utilizing coil measurement device to test coil, the current value of supposing described output port 30 is a
x, the current value a of described output port 30
xthe corresponding sampled data obtaining at described sampling unit 31 is A
x, have relational expression: A
x=a*i+b*a
x.According to described the first correction data A
0expression formula A
0=a*i and described the second correction data A
1expression formula a*i+b*I can obtain correction function: a
x* (A
1-A
0)=(A
x-A
0) * N, with reference to figure 3, store described correction function by described storage unit 32.It should be noted that described the first correction data A
0with described the second correction data A
1not needing to write in code, is all to store by described storage unit 32.
As described in step S25, in the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port.
Particularly, in the time of the current value of output port described in actual measurement 30, by described control module 33 control described switch element 34 in off-state, control described sampling unit 31 current signal of described output port 30 sampled, obtain the sampled data A corresponding to current signal of described output port 30
x.
As described in step S26, call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
Continue with reference to figure 3, control from described storage unit 32 and call described correction function by described control module 33, according to the sampled data A corresponding to current signal of described correction function and described output port 30
xcan obtain the parameter value of the signal of described output port 30, i.e. current value in the present embodiment.
In the present embodiment, in the time that the signal of described coil measurement device output port is current value, utilize the method that technical solution of the present invention provides to proofread and correct the output of described coil measurement value device, the correction function of setting up is associated to the signal of output port described the first correction data obtaining of sampling while not accessing load with described output port, take into full account the electric current that flows through sample resistance being produced by the consumption of described output port internal load or other losses, improved the accuracy of proofreading and correct result.
Embodiment 2
In the present embodiment, be described as example taking the magnitude of voltage of the signal of measuring described output port, Fig. 6 is the structural representation that in the present embodiment, tunable load is connected with measurement instrument.With reference to figure 6, in the time utilizing coil measurement device to test radio-frequency coil, there is the Voltage-output of multichannel, therefore, described tunable load and measurement instrument are also to there being many groups.In the present embodiment, described tunable load is adjustable resistance, described measurement instrument is voltage table, described tunable load and measurement instrument have n group, each group comprises that adjustable resistance in parallel (is respectively adjustable resistance 1, adjustable resistance 2, adjustable resistance n) and measurement instrument (be respectively voltage table V1, voltage table V2, voltage table Vn), one end ground connection of the tunable load of described parallel connection and measurement instrument, the other end is that connectivity port (is respectively connectivity port P1, connectivity port P2, connectivity port Pn), described connectivity port is connected with the switch element 34 shown in Fig. 3.
The bearing calibration of the magnitude of voltage of the signal to described output port is similar with the bearing calibration of the current value of the signal to described output port, difference is voltage signal to sample, when sampling, do not need to carry out current/voltage-converted, therefore in the time that described output port does not access load, described the first correction data A
0be 0, do not need to perform step S21, can directly perform step S22.
After execution step S22, in the time of execution step S23, can regulate described tunable load, the reading of described voltage table is described predetermined value N, and the voltage of described output port is sampled, and obtains the second correction data A
1.Step S24 is identical with the operation of the current value of the signal to described output port with step S25, does not repeat them here.
The embodiment of the present invention also provides a kind of coil measurement device, comprise the test cell for described coil is tested, also comprise the output compensator of above-mentioned coil measurement device, the structure of the output compensator of described coil measurement device can be as shown in Figure 3.
When coil is applied to when human body is tested in magnetic resonance system, need to proofread and correct the output of magnetic resonance system equally, therefore, output calibration method and apparatus based on above-mentioned coil measurement device, the embodiment of the present invention also provides a kind of output calibration method of magnetic resonance system, the output calibration method of described magnetic resonance system and the output calibration method of described coil measurement device are similar, comprise: in the time that the output port of magnetic resonance system does not access load, signal to described output port is sampled, and obtains the first correction data; At described output port access tunable load and measurement instrument; Adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data; Set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value; In the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port; Call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
Output calibration method based on above-mentioned magnetic resonance system, the embodiment of the present invention also provides a kind of output compensator of magnetic resonance system, the output compensator of described magnetic resonance system comprises: sampling unit, signal for the output port to magnetic resonance system is sampled, and obtains the sampled data corresponding to signal of described output port; Storage unit, for storing the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent the first correction data, A
1represent the second correction data, N represents predetermined value; Described the first correction data is described output port while not accessing load, the sampled data corresponding to signal of the described output port that described sampling unit obtains; Described the second correction data is adjusted described tunable load after being described output port access tunable load and measurement instrument, while making the reading of described measurement instrument be described predetermined value, and the sampled data corresponding to signal of the described output port that described sampling unit obtains; Control module, for controlling the work of described sampling unit and described storage unit, and in the time measuring, the sampled data corresponding to signal of the described output port obtaining according to described sampling unit, call the correction function corresponding to described output port of described cell stores, to obtain the parameter value of signal of described output port.
The output calibration method and apparatus of described magnetic resonance system and the output calibration method and apparatus of described coil measurement device are similar, and specific implementation process can, with reference to the embodiment of the output calibration method and apparatus part of described coil measurement device, not repeat them here.
The embodiment of the present invention also provides a kind of magnetic resonance system, comprises coil, also comprises the output compensator of above-mentioned coil measurement device, and the structure of the output compensator of described coil measurement device can be as shown in Figure 3.
In sum, the output calibration method and apparatus of the coil measurement device that technical solution of the present invention provides, improve the accuracy of proofreading and correct result, can coil measurement device multichannel be exported and be proofreaied and correct simultaneously, improve correction efficiency, and timing does not need correction data to write in code, without code is open, the security that has improved the code to need to be keep secret.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and amendment to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection domain of technical solution of the present invention.
Claims (21)
1. an output calibration method for coil measurement device, is characterized in that, comprising:
In the time that the output port of coil proving installation does not access load, the signal of described output port is sampled, obtain the first correction data;
At described output port access tunable load and measurement instrument;
Adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data;
Set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value;
In the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port;
Call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
2. the output calibration method of coil measurement device according to claim 1, is characterized in that, described tunable load is adjustable resistance.
3. the output calibration method of coil measurement device according to claim 1, is characterized in that, the signal of described output port is current signal.
4. the output calibration method of coil measurement device according to claim 3, is characterized in that, described measurement instrument is reometer, and described reometer is connected with described tunable load.
5. the output calibration method of coil measurement device according to claim 3, is characterized in that, the described signal to described output port is sampled and comprised the signal of described output port is carried out to current/voltage-converted and analog to digital conversion.
6. the output calibration method of coil measurement device according to claim 1, is characterized in that, the signal of described output port is voltage signal.
7. the output calibration method of coil measurement device according to claim 6, is characterized in that, described measurement instrument is voltage table, and described voltage table is in parallel with described tunable load.
8. the output calibration method of coil measurement device according to claim 6, is characterized in that, the described signal to described output port is sampled and comprised the signal of described output port is carried out to analog to digital conversion.
9. an output compensator for coil measurement device, is characterized in that, comprising:
Sampling unit, samples for the signal of the output port to coil measurement device, obtains the sampled data corresponding to signal of described output port;
Storage unit, for storing the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent the first correction data, A
1represent the second correction data, N represents predetermined value; Described the first correction data is described output port while not accessing load, the sampled data corresponding to signal of the described output port that described sampling unit obtains; Described the second correction data is adjusted described tunable load after being described output port access tunable load and measurement instrument, while making the reading of described measurement instrument be described predetermined value, and the sampled data corresponding to signal of the described output port that described sampling unit obtains;
Control module, for controlling the work of described sampling unit and described storage unit, and in the time measuring, the sampled data corresponding to signal of the described output port obtaining according to described sampling unit, call the correction function corresponding to described output port of described cell stores, to obtain the parameter value of signal of described output port.
10. the output compensator of coil measurement device according to claim 9, it is characterized in that, also comprise: switch element, under the control of described control module, so that described tunable load and measurement instrument access described output port or make described tunable load and measurement instrument and described output port disconnect.
The output compensator of 11. coil measurement devices according to claim 9, is characterized in that, described tunable load is adjustable resistance.
The output compensator of 12. coil measurement devices according to claim 9, is characterized in that, the signal of described output port is current signal.
The output compensator of 13. coil measurement devices according to claim 12, is characterized in that, described measurement instrument is reometer, and described reometer is connected with described tunable load.
The output compensator of 14. coil measurement devices according to claim 12, is characterized in that, described sampling unit comprises current/voltage-converted unit and AD conversion unit.
The output compensator of 15. coil measurement devices according to claim 9, is characterized in that, the signal of described output port is voltage signal.
The output compensator of 16. coil measurement devices according to claim 15, is characterized in that, described measurement instrument is voltage table, and described voltage table is in parallel with described tunable load.
The output compensator of 17. coil measurement devices according to claim 15, is characterized in that, described sampling unit comprises AD conversion unit.
18. 1 kinds of coil measurement devices, comprise the test cell for coil is tested, and it is characterized in that, also comprise the output compensator of the coil measurement device described in claim 9 to 17 any one.
The output calibration method of 19. 1 kinds of magnetic resonance systems, is characterized in that, comprising:
In the time that the output port of magnetic resonance system does not access load, the signal of described output port is sampled, obtain the first correction data;
At described output port access tunable load and measurement instrument;
Adjust described tunable load, the reading that makes described measurement instrument is predetermined value, and the signal of described output port is sampled, and obtains the second correction data;
Set up the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent described the first correction data, A
1represent described the second correction data, N represents described predetermined value;
In the time of actual measurement, the signal of described output port is sampled, obtain the sampled data corresponding to signal of described output port;
Call the correction function that described output port is corresponding, to obtain the parameter value of signal of described output port.
The output compensator of 20. 1 kinds of magnetic resonance systems, is characterized in that, comprising:
Sampling unit, samples for the signal of the output port to magnetic resonance system, obtains the sampled data corresponding to signal of described output port;
Storage unit, for storing the correction function that described output port is corresponding: a
x* (A
1-A
0)=(A
x-A
0) * N, wherein, a
xrepresent the parameter value of the signal of described output port, A
xrepresent the sampled data corresponding to signal of described output port, A
0represent the first correction data, A
1represent the second correction data, N represents predetermined value; Described the first correction data is described output port while not accessing load, the sampled data corresponding to signal of the described output port that described sampling unit obtains; Described the second correction data is adjusted described tunable load after being described output port access tunable load and measurement instrument, while making the reading of described measurement instrument be described predetermined value, and the sampled data corresponding to signal of the described output port that described sampling unit obtains;
Control module, for controlling the work of described sampling unit and described storage unit, and in the time measuring, the sampled data corresponding to signal of the described output port obtaining according to described sampling unit, call the correction function corresponding to described output port of described cell stores, to obtain the parameter value of signal of described output port.
21. 1 kinds of magnetic resonance systems, comprise coil, it is characterized in that, also comprise the output compensator of the magnetic resonance system described in claim 20.
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| CN1534871A (en) * | 2003-03-07 | 2004-10-06 | 埃利斯塔替续器股份有限公司 | Induction monitoring device and method for monitoring distance between first coil and second coil |
| US20080087381A1 (en) * | 2006-09-28 | 2008-04-17 | Applied Materials, Inc. | Matching network characterization using variable impedance analysis |
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| JP3990269B2 (en) * | 2002-12-17 | 2007-10-10 | 株式会社東芝 | Semiconductor device and starting method thereof |
| US7439739B2 (en) * | 2006-07-11 | 2008-10-21 | The Board Of Trustees Of The Leland Stanford Junior University | Anti-aliased magnetic resonance image reconstruction using partially parallel encoded data |
| DE102008061532B3 (en) * | 2008-12-10 | 2010-08-12 | Siemens Aktiengesellschaft | Method and apparatus for determining distortion correction data |
| CN102283651B (en) * | 2011-07-11 | 2013-01-23 | 苏州安科医疗系统有限公司 | Magnetic resonance imaging gradient field correction method |
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|---|---|---|---|---|
| CN1534871A (en) * | 2003-03-07 | 2004-10-06 | 埃利斯塔替续器股份有限公司 | Induction monitoring device and method for monitoring distance between first coil and second coil |
| US20080087381A1 (en) * | 2006-09-28 | 2008-04-17 | Applied Materials, Inc. | Matching network characterization using variable impedance analysis |
| US7363186B1 (en) * | 2006-12-22 | 2008-04-22 | Kelsey-Haynes Company | Apparatus and method for self calibration of current feedback |
| CN101636664A (en) * | 2007-03-20 | 2010-01-27 | 皇家飞利浦电子股份有限公司 | Magnetic resonance imaging system and method |
| CN102044863A (en) * | 2009-08-31 | 2011-05-04 | 伊顿公司 | Electrical switching apparatus including a plurality of rogowski coils and method of calibrating the same |
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| CN103869268B (en) | 2017-07-04 |
| CN106680752B (en) | 2019-07-19 |
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