CN108462542B - Method and device for determining transmission parameters of receiving link of magnetic resonance imaging system - Google Patents

Method and device for determining transmission parameters of receiving link of magnetic resonance imaging system Download PDF

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CN108462542B
CN108462542B CN201710096768.7A CN201710096768A CN108462542B CN 108462542 B CN108462542 B CN 108462542B CN 201710096768 A CN201710096768 A CN 201710096768A CN 108462542 B CN108462542 B CN 108462542B
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pin
transmission parameter
test signal
port
transmission
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CN108462542A (en
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张惠生
汪坚敏
李文明
佟瞳
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Siemens Shenzhen Magnetic Resonance Ltd
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Siemens Shenzhen Magnetic Resonance Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/29—Performance testing

Abstract

The embodiment of the invention discloses a method and a device for determining transmission parameters of a receiving link of a magnetic resonance imaging system. The receive chain comprises a test signal transmit chain, the method comprising: transmitting a test signal by using the test signal transmission link; receiving the test signal by using other receiving links except the test signal transmitting link, and measuring first transmission parameters of the other receiving links; calculating a second transmission parameter of the test signal transmitting link by using the first transmission parameter; determining a transmission parameter of the receive link based on the first transmission parameter and the second transmission parameter. The embodiment of the invention can acquire the transmission parameters of all receiving links and provides possibility for using the digital mode matrix.

Description

Method and device for determining transmission parameters of receiving link of magnetic resonance imaging system
Technical Field
The present invention relates to the field of magnetic resonance imaging technology, and in particular, to a method and apparatus for determining transmission parameters of a receive link of a magnetic resonance imaging system.
Background
Magnetic Resonance (MR) imaging is a kind of biomagnetic nuclear spin imaging technology that has been rapidly developed with the development of computer technology, electronic circuit technology, and superconductor technology. The hydrogen nuclei (H +) precessing in human tissue are vibrated by magnetic field and RF pulse to generate RF signal, which is processed by computer to form image. When an object is placed in a magnetic field, it is irradiated with an appropriate electromagnetic wave to resonate it, and then the electromagnetic wave released from it is analyzed, the position and kind of nuclei constituting the object can be known, and an accurate stereoscopic image of the inside of the object can be drawn therefrom.
The magnetic resonance imaging system receiving link generally comprises a socket, a sickbed, a switch array, a receiving power amplifier device, a receiver, an analog/digital (A/D) conversion port and the like. In order to use the digital pattern matrix function, it is generally necessary to predetermine the transmission parameters of all the receiving chains.
However, in the prior art, since the transmission test signal occupies part of the receiving link, the transmission parameters of all the receiving links cannot be completely measured.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining transmission parameters of a receiving link of a magnetic resonance imaging system.
The technical scheme of the embodiment of the invention is as follows:
a method of determining transmission parameters of a receive chain of a magnetic resonance imaging system, the receive chain including a test signal transmit chain, the method comprising:
transmitting a test signal by using the test signal transmission link;
receiving the test signal by using other receiving links except the test signal transmitting link, and measuring first transmission parameters of the other receiving links;
calculating a second transmission parameter of the test signal transmitting link by using the first transmission parameter;
determining a transmission parameter of the receive link based on the first transmission parameter and the second transmission parameter.
In one embodiment, the transmission port of the test signal transmission link includes an original radio frequency channel and an original analog-to-digital conversion port;
the calculating the second transmission parameter of the test signal transmission link by using the first transmission parameter comprises:
changing a transmitting port of a test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port, and determining a first intermediate value of a second transmission parameter;
changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter;
changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter;
and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
In one embodiment, the receiving chain comprises m radio frequency channels and n analog-to-digital conversion ports; the transmitting port of the test signal transmitting link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
Changing a transmitting port of a test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port, and determining a first intermediate value of a second transmission parameter includes: change transmit port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure BDA0001230513740000021
And RXpMeasured value of column
Figure BDA0001230513740000022
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure BDA0001230513740000023
As a first intermediate value of the second transmission parameter;
changing the transmitting port of the test signal transmitting link to include the first radio frequency channel and the original analog-to-digital conversion port, and determining the second intermediate value of the second transmission parameter includes: change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of the second transmission parameter;
changing the transmitting port of the test signal transmitting link to include the first radio frequency channel and the first analog-to-digital conversion port, and determining the third intermediate value of the second transmission parameter includes: change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure BDA0001230513740000024
(PINi，RXp) Measured value of
Figure BDA0001230513740000025
(PINh，RXj) Measured value of
Figure BDA0001230513740000026
And (PIN)h，RXp) Measured value of
Figure BDA0001230513740000027
As a third intermediate value of the second transmission parameter;
wherein i and g are each a positive integer no greater than m; j. k and p are respectively positive integers not greater than n.
In one embodiment, determining a second transmission parameter of the test signal transmission link using the first transmission parameter, the second transmission parameter first intermediate value, the second transmission parameter second intermediate value, and the second transmission parameter third intermediate value comprises:
using thetag→iContained in (PIN)i，RXp) Measured value of
Figure BDA0001230513740000028
(PINi，RXj) Measured value of
Figure BDA0001230513740000029
And (PIN)i，RXp) Measured value of
Figure BDA00012305137400000210
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000211
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure BDA00012305137400000212
(PINh，RXj) Measured value of
Figure BDA00012305137400000213
And (PIN)h，RXp) Measured value of
Figure BDA00012305137400000214
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000215
Will be provided with
Figure BDA00012305137400000216
To thetag→iIn the process, the
Figure BDA00012305137400000217
To thetag→hPerforming the following steps;
based on supplement of
Figure BDA00012305137400000218
Theta ofg→iAnd supplement with
Figure BDA00012305137400000219
Theta ofg→hAnd thetai→hComputing includes a transmit Port (PIN)i，RXj) Theta ofi→i；
Will contain a transmit Port (PIN)i，RXj) Theta ofi→iTransmit Port (PIN)i，RXj) Other than that
Figure BDA00012305137400000220
And combining with the first transmission parameter to obtain the second parameter.
In one embodiment, the calculation divides the transmit Port (PIN)i，RXj) Other than that
Figure BDA00012305137400000221
The method comprises the following steps: by using
Figure BDA00012305137400000222
Figure BDA00012305137400000223
Computing
Figure BDA00012305137400000224
Wherein
Figure BDA00012305137400000225
Is a transmitting Port of (PIN)i，RXk) The RXp column of measurements.
In one embodiment, the calculation includes a transmit Port (PIN)i，RXj) Theta ofi→iThe method comprises the following steps:
using thetai→i＝θi→h+θg→i-θg→hCalculating thetai→i(ii) a Wherein theta isi→hThe method comprises the following steps: the transmitting Port Is (PIN)i，RXk) Measurement of RXP column and the method of measuring RXP column
Figure BDA0001230513740000031
Of (PIN)h，RXj) The calculated value of (a).
In one embodiment, the transmission parameters of the magnetic resonance imaging system receive chain comprise phase parameters or amplitude parameters.
An apparatus for determining transmission parameters of a receive chain of a magnetic resonance imaging system, the receive chain including a test signal transmit chain, the apparatus comprising:
the test signal transmitting unit is used for transmitting a test signal by using the test signal transmitting link;
the first transmission parameter measuring module is used for receiving the test signal by using the rest receiving links except the test signal transmitting link and measuring the first transmission parameters of the rest receiving links;
the second transmission parameter calculation module is used for calculating a second transmission parameter of the test signal transmission link by using the first transmission parameter;
a transmission parameter determination module configured to determine a transmission parameter of the receive link based on the first transmission parameter and the second transmission parameter.
In one embodiment, the transmission port of the test signal transmission link includes an original radio frequency channel and an original analog-to-digital conversion port;
the second transmission parameter calculation module is used for changing a transmitting port of the test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port and determining a first intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter; and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
In one embodiment, the receiving chain comprises m radio frequency channels and n analog-to-digital conversion ports; the transmitting port of the test signal transmitting link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
A second transmission parameter calculation module for changing the transmission port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure BDA0001230513740000032
And RXpMeasured value of column
Figure BDA0001230513740000033
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure BDA0001230513740000034
As a first intermediate value of the second transmission parameter; change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of the second transmission parameter; change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure BDA0001230513740000035
(PINi，RXp) Measured value of
Figure BDA0001230513740000036
(PINh，RXj) Measured value of
Figure BDA0001230513740000037
And (PIN)h，RXp) Measured value of
Figure BDA0001230513740000038
As a third intermediate value of the second transmission parameter, where i and g are each a positive integer no greater than m; j. k and p are respectively positive integers not greater than n; using thetag→iContained in (PIN)i，RXp) Measured value of
Figure BDA0001230513740000039
(PINi，RXj) Measured value of
Figure BDA00012305137400000310
And (PIN)i，RXp) Measured value of
Figure BDA00012305137400000311
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000312
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure BDA00012305137400000313
(PINh，RXj) Measured value of
Figure BDA00012305137400000314
And (PIN)h，RXp) Measured value of
Figure BDA00012305137400000315
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000316
Will be provided with
Figure BDA00012305137400000317
To thetag→iIn the process, the
Figure BDA0001230513740000041
To thetag→hPerforming the following steps; based on supplement of
Figure BDA0001230513740000042
Theta ofg→iAnd supplement with
Figure BDA0001230513740000043
Theta ofg→hAnd thetai→hComputing includes a transmit Port (PIN)i，RXj) Theta ofi→i(ii) a Will contain a transmit Port (PIN)i，RXj) Theta ofi→iTransmit Port (PIN)i，RXj) Other than that
Figure BDA0001230513740000044
And combining with the first transmission parameter to obtain the second parameter.
In summary, in the embodiment of the present invention, the test signal is transmitted by using the test signal transmitting link; receiving the test signal by using the other receiving links except the test signal transmitting link, and measuring first transmission parameters of the other receiving links; calculating a second transmission parameter of the test signal transmitting link; determining a transmission parameter of a receiving link based on the first transmission parameter and the second transmission parameter. Therefore, the embodiment of the invention can calculate the transmission parameters of the test signal transmitting link which cannot be obtained by testing based on the measurement results of the other receiving links except the test signal transmitting link. Therefore, even if the transmission test signal occupies part of the receiving link, the embodiment of the invention can still completely acquire the transmission parameters of all the receiving links, thereby providing possibility for using the digital mode matrix.
Drawings
Fig. 1 is a schematic structural diagram for testing transmission parameters of a receiving link of a magnetic resonance imaging system according to an embodiment of the present invention.
Fig. 2 is a flow chart of a method for determining transmission parameters of a receiving link of a magnetic resonance imaging system according to an embodiment of the invention.
FIG. 3 is a diagram of a (PIN) used in accordance with an embodiment of the present invention2，RX1) The test results are shown schematically as the transmit port.
FIG. 4 is a diagram of a (PIN) used in accordance with an embodiment of the present invention2，RX8) The test results are shown schematically as the transmit port.
FIG. 5 is a diagram illustrating RX calculation according to an embodiment of the present invention1Column (except for transmit Port (PIN)2，RX1) External) transmission parameters.
FIG. 6 is a diagram of a (PIN) used in accordance with an embodiment of the present invention6，RX1) The test results are shown schematically as the transmit port.
FIG. 7 is a diagram of a (PIN) used in accordance with an embodiment of the present invention6，RX8) The test results are shown schematically as the transmit port.
FIG. 8 is a diagram illustrating calculation of a transmit port (Pin) according to an embodiment of the present invention2，RX1) And (Pin)11，RX1) Schematic representation of transmission parameters of (1).
Fig. 9 is a diagram illustrating a method for determining a complete transmission parameter matrix of a receiving link according to an embodiment of the present invention.
Figure 10 is a block diagram of an apparatus for determining transmission parameters of a receive chain of a magnetic resonance imaging system in accordance with an embodiment of the present invention.
Detailed Description
In order to make the technical scheme and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
Fig. 1 is a schematic structural diagram for testing transmission parameters of a receiving link of a magnetic resonance imaging system according to an embodiment of the present invention.
As shown in fig. 1, a receiving link S for receiving a magnetic resonance signal generally includes a plug 101, a patient bed 102, a switch array 103, a receiving power amplifier device 104, and an a/D conversion port array 105. The a/D conversion port array 105 includes a plurality of a/D conversion ports; the switch array 103 includes a plurality of switches, each corresponding to a radio frequency channel.
When a transmission parameter (e.g. phase or amplitude) of the receiving link S needs to be tested:
first, the transmitter 106 generates a transmission test signal, and the transmission test signal passes through the BCCS107, and then sequentially passes through a predetermined a/D conversion port in the a/D conversion port array 105, a predetermined radio frequency channel in the switch array 103, the patient bed 102, and the plug 101 to be fed into the DMM adapter 107.
Then, the DMM adapter 107 performs down-conversion on the transmission test signal and loops the down-converted transmission test signal back to the remaining a/D conversion ports of the a/D conversion port array 105 except for the predetermined AD conversion port. The loopback path specifically includes: the transmitted test signal after down-conversion by the DMM adapter 107 sequentially passes through the plug 101, the patient bed 102, the other radio frequency channels except the predetermined radio frequency channel in the switch array 103, and the receiving power amplifier device 104, and loops back to the other a/D conversion ports except the predetermined a/D conversion port in the a/D conversion port array 105.
Assuming that the switch array 103 includes m switches (i.e., the number of rf paths is m), the a/D conversion port array 105 includes n a/D conversion ports. Then the result of the transmission parameter test of the receiving link S should be a matrix of m x n.
However, during the process of feeding the transmission test signal into the DMM adapter 107, since a predetermined a/D conversion port in the a/D conversion port array 105 and a predetermined switch in the switch array 103 are occupied to transmit the test signal to the DMM adapter 107, one row of data and one column of data in the m × n matrix are missing because they cannot be directly tested. That is, in the m × n matrix, one row data and one column data are missing, so that the digital pattern matrix cannot be used in the subsequent signal processing to perform complex calculation on the magnetic resonance signals.
In view of the technical defect that the whole m × n matrix data cannot be completely obtained in the prior art, the embodiment of the invention provides a receiving link transmission parameter determination scheme, which can completely obtain the whole m × n matrix data, thereby laying a foundation for the subsequent use of a digital mode matrix.
In an embodiment of the invention, a magnetic resonance imaging system receiving chain comprises: (1) testing a signal transmission link; (2) the rest receiving chains except the test signal transmitting chain. The test signal transmitting link is used for transmitting a test signal to the DMM adapter; the remaining receive chains, except the test signal transmit chain, are used to receive test signals from the DMM adapter that are transmitted via the test signal transmit chain. After determining the transmission parameters of all the receiving chains based on the embodiment of the invention, the test signal transmitting chain can be normally used for receiving the magnetic resonance signals as the other receiving chains.
Fig. 2 is a flow chart of a method for determining transmission parameters of a receiving link of a magnetic resonance imaging system according to an embodiment of the invention.
As shown in fig. 2, the method includes:
step 201: and transmitting the test signal by using the test signal transmitting link.
Here, the transmitter first generates a transmit test signal that is fed through the test signal transmit link, the patient bed and the plug into the DMM adapter.
Step 202: the test signal is received by using the rest receiving chains except the test signal transmitting chain, and the first transmission parameters of the rest receiving chains are measured.
Here, the DMM adapter performs a down-conversion on the transmit test signal and loops the down-converted transmit test signal back to the remaining receive chains except for the test signal transmit chain. In this loop-back procedure, the first transmission parameters of the remaining receiving links except the test signal transmitting link may be measured.
The first transmission parameter represents the transmission parameters of the remaining receiving links except the test signal transmitting link. For example, when the number of rf channels is m and the number of a/D conversion port arrays is n, the first transmission parameter is an m × n matrix lacking one row of data and one column of data (i.e., lacking the transmission parameter of the test signal transmission link).
Step 203: and calculating a second transmission parameter of the test signal transmitting link by using the first transmission parameter.
Here, the second transmission parameters of the test signal transmission link are calculated based on the first transmission parameters obtained in step 201. The second transmission parameter represents a transmission parameter of the test signal transmission link. Specifically, the second transmission parameter is the row and column of data missing from the m × n matrix in step 202.
Step 204: based on the first transmission parameter and the second transmission parameter, a transmission parameter of the receiving link is determined.
Here, combining the first transmission parameter and the second transmission parameter may obtain the transmission parameters of the entire receiving link, thereby obtaining a complete m × n matrix.
In one embodiment, the transmission port of the test signal transmission link comprises an original radio frequency channel and an original analog-to-digital conversion port;
calculating the second transmission parameter of the test signal transmission link in step 203 includes: changing a transmitting port of a test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port, and determining a first intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter; and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
It can be seen that, in order to calculate the transmission parameters of the test signal transmission link that cannot be directly tested due to the transmission of the test signal, the embodiment of the present invention first measures the first transmission parameters of the remaining receiving links that do not need to transmit the test signal, then changes the transmission port of the test signal transmission link and tests the intermediate value of the transmission parameters after the transmission port is changed, and then calculates the transmission parameters of the original test signal transmission link based on the intermediate value of the transmission parameters and the first transmission parameters.
In one embodiment, the receiving chain comprises m radio frequency channels and n analog-to-digital conversion ports; the transmission port of the test signal transmission link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
Calculating the second transmission parameter of the test signal transmission link in step 203 includes:
change transmit port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure BDA0001230513740000071
And RXpMeasured value of column
Figure BDA0001230513740000072
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure BDA0001230513740000073
As a first intermediate value of a second transmission parameter; change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of a second transmission parameter; change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure BDA0001230513740000074
(PINi，RXp) Measured value of
Figure BDA0001230513740000075
(PINh，RXj) Measured value of
Figure BDA0001230513740000076
And (PIN)h，RXp) Measured value of
Figure BDA0001230513740000077
As a third intermediate value of the second transmission parameter; wherein i and g are each a positive integer no greater than m; j. k and p are respectively positive integers not greater than n.
In one embodiment, the test signal transmit chain is determined using the first transmission parameter, the second transmission parameter first intermediate value, the second transmission parameter second intermediate value, and the second transmission parameter third intermediate valueThe second transmission parameters of the way include: using thetag→iContained in (PIN)i，RXp) Measured value of
Figure BDA0001230513740000078
(PINi，RXj) Measured value of
Figure BDA0001230513740000079
And (PIN)i，RXp) Measured value of
Figure BDA00012305137400000710
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000711
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure BDA00012305137400000712
(PINh，RXj) Measured value of
Figure BDA00012305137400000713
And (PIN)h，RXp) Measured value of
Figure BDA00012305137400000714
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400000715
Will be provided with
Figure BDA00012305137400000716
To thetag→iIn the process, the
Figure BDA00012305137400000717
To thetag→hPerforming the following steps; based on supplement of
Figure BDA00012305137400000718
Theta ofg→iAnd supplement with
Figure BDA00012305137400000719
Theta ofg→hAnd thetai→hCalculating thetai→i(ii) a Will thetai→i、
Figure BDA00012305137400000720
And combining with the first transmission parameter to obtain a second parameter.
In one embodiment, calculating
Figure BDA00012305137400000721
The method comprises the following steps: by using
Figure BDA00012305137400000722
Computing
Figure BDA00012305137400000723
Wherein
Figure BDA00012305137400000724
Is a transmitting Port of (PIN)i，RXk) The RXp column of measurements.
In one embodiment, θ is calculatedi→iThe method comprises the following steps: using thetai→i＝θi→h+θg→i-θg→hCalculating thetai→i；θi→hIs a transmitting Port of (PIN)i，RXk) The RXp column of measurements.
In one embodiment, the transmission parameters of the magnetic resonance imaging system receive chain comprise phase parameters or amplitude parameters.
After the phase parameter of the receiving link is determined by the embodiment of the invention, the phase compensation matrix of the receiving link can be further obtained. After the amplitude parameter of the receiving link is determined through the embodiment of the invention, the amplitude insertion loss compensation matrix of the receiving link can be further obtained.
The following is an example of measuring a phase parameter of a receiving link, and an embodiment of the present invention is described.
For convenience, it is assumed that the magnetic resonance imaging system has 16 radio frequency channels (i.e., m ═ 16), and 8 a/D ports (n ═ 8). The complete test result should therefore be a matrix of 16 x 8. The 16 RF channels are respectively Pin1、Pin2、Pin3、Pin4、Pin5、Pin6、Pin7、Pin8、Pin9、Pin10、Pin11、Pin12、Pin13、Pin14、Pin15And Pin16. The 8A/D ports are respectively RX1、RX2、RX3、RX4、RX5、RX6、RX7And RX8。
The first step is as follows: will (Pin)i，RXj) As a transmit port for transmitting test signals, and in addition to (Pin)i，RXj) The remaining receive chains receive the test signal. In this process, the measurement is carried out except for (Pin)i，RXj) And the transmission parameters of the rest receiving links except the receiving link.
For example, assuming i is 2 and j is 1, then (Pin) is used2，RX1) As a transmit port to transmit test signals, and in addition to (Pin)2，RX1) The remaining receive chains receive the test signal and measure except (Pin)2，RX1) And the transmission parameters of the rest receiving links except the receiving link.
FIG. 3 is a diagram of a (PIN) used in accordance with an embodiment of the present invention2，RX1) The test results are shown schematically as the transmit port. In the matrix of m x n, RX, marked with left-oblique hatching, is shown in fig. 31Data of column
Figure BDA0001230513740000081
And Pin identified with left-leaning diagonal shading2Data of column (θ)2→2) It cannot be tested directly, and the rest of the data in the matrix of m x n can be tested directly. The data obtained by direct test is the test signal transmitting link (PIN)2，RX1) Transmission parameter of other receiving linksAnd (4) counting.
The pth data in the m x n matrix may be recorded for subsequent calculations. Assuming that p is 3, column 3 data is recorded
Figure BDA0001230513740000082
The second step is that: will (Pin)i，RXk) As a transmit port for transmitting test signals, and in addition to (Pin)i，RXk) The remaining receive chains receive the test signal. In this process, the measurement is carried out except for (Pin)i，RXk) And receiving parameters of other receiving links.
Following the above example, assuming i is 2 and k is 8, RX can be testedjRow and RXpData of columns, the two columns of data being recorded as
Figure BDA0001230513740000083
And
Figure BDA0001230513740000084
FIG. 4 is a diagram of a (PIN) used in accordance with an embodiment of the present invention2，RX8) The test results are shown schematically as the transmit port. As can be seen in fig. 4, identified by vertical line shading
Figure BDA0001230513740000085
And marked by vertical line shading
Figure BDA0001230513740000086
May be obtained based on the test results. Also, RX is identified with left-hand diagonal shading8Data of column
Figure BDA0001230513740000087
And Pin identified with left-leaning diagonal shading2Data of line (theta)2→2) Can not be directly tested.
Wherein
Figure BDA0001230513740000088
Lack (Pin)2，RX1) The data of (a);
Figure BDA0001230513740000089
lack (Pin)2，RX3) The data of (1).
The third step: calculating RX1Column (Pin) except2，RX1) Other data
Figure BDA00012305137400000810
The specific calculation formula is as follows:
Figure BDA00012305137400000811
in this connection, it is possible to use,
Figure BDA00012305137400000812
to adopt RX1RX at transmission1Column (Pin) except2，RX1) The rest of the data;
Figure BDA00012305137400000813
the data recorded in the first step;
Figure BDA00012305137400000814
and
Figure BDA00012305137400000815
the data recorded in the second step. In particular, the amount of the solvent to be used,
Figure BDA00012305137400000816
lack of (Pin)2，RX2) The data of (a) to (b) to (c),
Figure BDA00012305137400000817
lack (Pin)2，RX1) The data of (a) to (b) to (c),
Figure BDA00012305137400000818
lack (Pin)2，RX3) The data of (a) to (b) to (c),
Figure BDA00012305137400000819
lack (Pin)2，RX3) Data of (2), thus calculated
Figure BDA00012305137400000820
Is also absent (Pin)2，RX1) The data of (1). In other words, calculated
Figure BDA00012305137400000821
Including the use of RX1RX at transmission1Column (Pin) except2，RX1) The rest of the data other than the (Pin) is necessarily included11，RX1) Data of (2)
Figure BDA00012305137400000822
FIG. 5 is a diagram illustrating RX calculation according to an embodiment of the present invention1Column (except for transmit Port (PIN)2，RX1) External) transmission parameters.
As can be seen in FIG. 5, except that (Pin)2，RX1) Other than RX1The data for the columns (identified by right-angled diagonal shading) can be calculated. Thus, referring to the data in FIG. 3, Pin10Data of line theta2→11Is complete data.
The fourth step: use (Pin)g，RXj) As a transmit port for transmitting test signals, and in addition to (Pin)g，RXj) The remaining receive chains receive the test signal. In this process, the measurement is carried out except for (Pin)g，RXj) And the transmission parameters of the rest receiving links except the receiving link.
In the example above, let g be 6, so (Pin)6，RX1) For the transmitting port, Pin is obtained by testingiRows and PinhThe value of the row. Let h be 11, so the test yields Pin2Rows and Pin11The data of the row.
FIG. 6 is a schematic representation of a system according to the present inventionImplementation usage (PIN)6，RX1) The test results are shown schematically as the transmit port.
As shown in FIG. 6, Pin2Rows and Pin11The data of the rows are respectively theta6→2And theta6→11And are identified by vertical line shading. Wherein, theta6→2Lack of (PIN)2，RX1) The value of (is marked by left-sloping line shading), theta6→11Lack of (PIN)11，RX1) Value of (identified with left-sloping line shading).
The fifth step: use (PIN)g，RXk) Transmitting test signals as transmission ports, and in addition to (PIN)g，RXk) The remaining receive chains receive the test signal. In this process, the exception (PIN) is measuredg，RXk) And the transmission parameters of the rest receiving links except the receiving link.
Continuing with the above example, assuming k is 8, the result of the fifth step can be obtained (Pin)2，RX1)、(Pin2，RX3)、(Pin11，RX1) And (Pin)11，RX3) The value of (c).
FIG. 7 is a diagram of a (PIN) used in accordance with an embodiment of the present invention6，RX8) The test results are shown schematically as the transmit port. As shown in FIG. 7, (Pin)2，RX1) Value of (A)
Figure BDA0001230513740000091
(Pin2，RX3) Value of (A)
Figure BDA0001230513740000092
(Pin11，RX1) Is/are as follows
Figure BDA0001230513740000093
And (Pin)11，RX3) Value of (A)
Figure BDA0001230513740000094
Are tested in the fifth step and are marked by vertical line shading.
And a sixth step: calculated using the following formula (PIN)i，RXj) And (PIN)h，RXj) A value of (i.e., (Pin)2，RX1) Value of (A)
Figure BDA0001230513740000095
And (Pin)11，RX1) Value of (A)
Figure BDA0001230513740000096
Figure BDA0001230513740000097
Figure BDA0001230513740000098
Wherein:
Figure BDA0001230513740000099
may be from θ of the fourth step6→2In the process of direct reading out of the image,
Figure BDA00012305137400000910
may be from θ of the fourth step6→11Is read out directly.
FIG. 8 is a diagram of computing a transmit Port (PIN) according to an embodiment of the present inventioni，RXj) And (PIN)h，RXj) Schematic representation of transmission parameters of (1).
As can be seen from FIG. 8, (Pin)2，RX1) Value of (A)
Figure BDA00012305137400000911
And (Pin)11，RX1) Value of (A)
Figure BDA00012305137400000912
Can be calculated. Will (Pin)2，RX1) Value of (A)
Figure BDA00012305137400000913
Fill to theta6→2Rear, theta6→2I.e. becomes complete data. Will (Pin)11，RX1) Value of (A)
Figure BDA00012305137400000914
Fill to theta6→11Rear, theta6→11I.e. becomes complete data.
The seventh step: calculating PIN using the following formulaiLine (i.e., PIN)2Row) of the values.
θ2→2＝θ2→11+θ6→2-θ6→11。
Wherein:
θ2→2to adopt PIN2PIN at time of transmission2Complete data for a row; theta2→11To adopt PIN2Pin in transmission10Complete data for a row;
θ6→2involving calculation in the sixth step
Figure BDA00012305137400000915
To adopt PIN6Pin in transmission2Complete data for a row;
θ6→11involving calculation in the sixth step
Figure BDA00012305137400000916
To adopt PIN6Pin in transmission2The complete data of the row.
Therefore, θ calculated in the seventh step2→2Involving the use of PIN2PIN at time of transmission2All data of a row.
Theta calculated in the seventh step2→2Calculated in the third step
Figure BDA00012305137400000917
And combining to obtain a complete m x n matrix.
Fig. 9 is a diagram illustrating a method for determining a complete transmission parameter matrix of a receiving link according to an embodiment of the present invention.
As can be seen from FIG. 9, RX1All data and Pin of the column2All data for a column can be calculated, while other data can be tested directly, so the complete test result should be a complete matrix of 16 x 8. That is, RX is calculated in the third step1Column (Pin) except2，RX1) Other data
Figure BDA00012305137400000918
In the seventh step, PIN is calculated2Complete data of a row (including (Pin)2，RX1) RX) can thus be calculated1Column sum PIN2The complete data of the rows, combined with the rest of the data in the m x n matrix obtained in the first step, can form a complete matrix of 16 x 8.
In the above examples, the present invention is explained in detail by taking specific numerical values of i, g, j, k and p as examples. Those skilled in the art will appreciate that the specific numbers of i, g, j, k, and p may be adjusted accordingly, as long as i and g are not greater than the number of rf channels m, and j, k, and p are not greater than the number of a/D conversion ports n, respectively.
Based on the above description, the present invention also provides an apparatus for determining transmission parameters of a receiving link of a magnetic resonance imaging system.
Figure 10 is a block diagram of an apparatus for determining transmission parameters of a receive chain of a magnetic resonance imaging system in accordance with an embodiment of the present invention. The receive chain comprises a test signal transmit chain, the apparatus 1000 comprising:
a test signal transmitting unit 1001 for transmitting a test signal using the test signal transmitting link;
a first transmission parameter measuring module 1002, configured to receive a test signal by using the remaining receiving links except the test signal transmitting link, and measure a first transmission parameter of the remaining receiving links;
a second transmission parameter calculation module 1003, configured to calculate a second transmission parameter of the test signal transmission link by using the first transmission parameter;
a transmission parameter determining module 1004 configured to determine a transmission parameter of the receiving link based on the first transmission parameter and the second transmission parameter.
In one embodiment, the transmission port of the test signal transmission link comprises an original radio frequency channel and an original analog-to-digital conversion port;
a second transmission parameter calculation module 1003, configured to change a transmission port of the test signal transmission link to include an original radio frequency channel and a first analog-to-digital conversion port, and determine a first intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter; and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
In one embodiment, the receiving chain comprises m radio frequency channels and n analog-to-digital conversion ports; the transmission port of the test signal transmission link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
A second transmission parameter calculation module 1003 for changing the transmit port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure BDA0001230513740000101
And RXpMeasured value of column
Figure BDA0001230513740000102
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure BDA0001230513740000103
As a first intermediate value of a second transmission parameter; change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of a second transmission parameter; change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure BDA0001230513740000104
(PINi，RXp) Measured value of
Figure BDA0001230513740000105
(PINh，RXj) Measured value of
Figure BDA0001230513740000106
And (PIN)h，RXp) Measured value of
Figure BDA0001230513740000107
Taking the second transmission parameter as a third intermediate value, wherein i and g are respectively positive integers not greater than m; j. k and p are respectively positive integers not greater than n; using thetag→iContained in (PIN)i，RXp) Measured value of
Figure BDA0001230513740000108
(PINi，RXj) Measured value of
Figure BDA0001230513740000109
And (PIN)i，RXp) Measured value of
Figure BDA00012305137400001010
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400001011
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure BDA00012305137400001012
(PINh，RXj) Measured value of
Figure BDA00012305137400001013
And (PIN)h，RXp) Measured value of
Figure BDA00012305137400001014
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure BDA00012305137400001015
Will be provided with
Figure BDA00012305137400001016
To thetag→iIn the process, the
Figure BDA00012305137400001017
To thetag→hPerforming the following steps; based on supplement of
Figure BDA00012305137400001018
Theta ofg→iAnd supplement with
Figure BDA00012305137400001019
Theta ofg→hAnd thetai→hComputing includes a transmit Port (PIN)i，RXj) Theta ofi→i(ii) a Will contain a transmit Port (PIN)i，RXj) Theta ofi→iTransmit Port (PIN)i，RXj) Other than that
Figure BDA0001230513740000111
And combining with the first transmission parameter to obtain a second parameter.
It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.
The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.
The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method according to an embodiment of the present invention. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any one of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.
Examples of the storage medium for supplying the program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer via a communications network.
In summary, in the embodiment of the present invention, the test signal is transmitted by using the test signal transmitting link; receiving the test signal by using the other receiving links except the test signal transmitting link, and measuring first transmission parameters of the other receiving links; calculating a second transmission parameter of the test signal transmitting link; based on the first transmission parameter and the second transmission parameter, a transmission parameter of the receiving link is determined. Therefore, the embodiment of the invention can calculate the transmission parameters of the test signal transmitting link which cannot be obtained by testing based on the measurement results of the other receiving links except the test signal transmitting link. Therefore, even if the transmission test signal occupies part of the receiving link, the embodiment of the invention can still completely acquire the transmission parameters of all the receiving links, thereby providing possibility for using the digital mode matrix subsequently.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method of determining transmission parameters of a receive chain of a magnetic resonance imaging system, the receive chain including a test signal transmit chain, the method comprising:
transmitting a test signal by using the test signal transmission link;
receiving the test signal by using other receiving links except the test signal transmitting link, and measuring first transmission parameters of the other receiving links;
calculating a second transmission parameter of the test signal transmitting link by using the first transmission parameter;
determining a transmission parameter of the receive chain based on the first transmission parameter and the second transmission parameter,
the transmitting port of the test signal transmitting link comprises an original radio frequency channel and an original analog-to-digital conversion port;
the calculating the second transmission parameter of the test signal transmission link by using the first transmission parameter comprises:
changing a transmitting port of a test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port, and determining a first intermediate value of a second transmission parameter;
changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter;
changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter;
and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
2. The method of claim 1, wherein the receive chain comprises m radio frequency channels and n analog-to-digital conversion ports; the transmitting port of the test signal transmitting link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
Changing a transmitting port of a test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port, and determining a first intermediate value of a second transmission parameter includes: change transmit port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure FDA0002897213140000011
And RXpMeasured value of column
Figure FDA0002897213140000012
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure FDA0002897213140000013
As a first intermediate value of the second transmission parameter;
changing the transmitting port of the test signal transmitting link to include the first radio frequency channel and the original analog-to-digital conversion port, and determining the second intermediate value of the second transmission parameter includes: change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of the second transmission parameter;
changing the transmitting port of the test signal transmitting link to include the first radio frequency channel and the first analog-to-digital conversion port, and determining the third intermediate value of the second transmission parameter includes: change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure FDA0002897213140000014
Measured value of
Figure FDA0002897213140000015
Measured value of
Figure FDA0002897213140000016
And (PIN)h，RXp) Measured value of
Figure FDA0002897213140000017
As a third intermediate value of the second transmission parameter;
wherein i and g are each a positive integer no greater than m; j. k and p are respectively positive integers not greater than n.
3. The method of claim 2, wherein determining the second transmission parameter of the test signal transmit chain using the first transmission parameter, the second transmission parameter first intermediate value, the second transmission parameter second intermediate value, and the second transmission parameter third intermediate value comprises:
using thetag→iContained in (PIN)i，RXp) Measured value of
Figure FDA0002897213140000021
Measured value of
Figure FDA0002897213140000022
And (PIN)i，RXp) Measured value of
Figure FDA0002897213140000023
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure FDA0002897213140000024
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure FDA0002897213140000025
Figure FDA0002897213140000026
Measured value of
Figure FDA0002897213140000027
And (PIN)h，RXp) Measured value of
Figure FDA0002897213140000028
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure FDA0002897213140000029
Will be provided with
Figure FDA00028972131400000210
To thetag→iIn the process, the
Figure FDA00028972131400000211
To thetag→hPerforming the following steps;
based on supplement of
Figure FDA00028972131400000212
Theta ofg→iAnd supplement with
Figure FDA00028972131400000213
Theta ofg→hAnd thetai→hComputing includes a transmit Port (PIN)i，RXj) Theta ofi→i；
Will contain a transmit Port (PIN)i，RXj) Theta ofi→iA transmit Port (PIN)i，RXj) Other than that
Figure FDA00028972131400000214
And combining the first transmission parameter and the second transmission parameter to obtain the second transmission parameter.
4. A method of determining transmission parameters of a receive chain of a magnetic resonance imaging system according to claim 2,
the compute divide by transmit Port (PIN)i，RXj) Other than that
Figure FDA00028972131400000215
The method comprises the following steps: by using
Figure FDA00028972131400000216
Computing
Figure FDA00028972131400000217
Wherein
Figure FDA00028972131400000218
Is a transmitting Port of (PIN)i，RXk) Time of flightRXp column.
5. A method for determining transmission parameters of a receive chain of a magnetic resonance imaging system according to claim 3,
the computing includes a transmit Port (PIN)i，RXj) Theta ofi→iThe method comprises the following steps:
using thetai→i＝θi→h+θg→i-θg→hCalculating thetai→i(ii) a Wherein theta isi→hThe method comprises the following steps: the transmitting Port Is (PIN)i，RXk) Measurement of RXP column and the method of measuring RXP column
Figure FDA00028972131400000219
Of (PIN)h，RXj) The calculated value of (a).
6. Method for determining transmission parameters of a receive chain of a magnetic resonance imaging system according to any of claims 1-5, characterized in that the transmission parameters of the receive chain of the magnetic resonance imaging system comprise phase parameters or amplitude parameters.
7. An apparatus for determining transmission parameters of a receive chain of a magnetic resonance imaging system, the receive chain including a test signal transmit chain, the apparatus comprising:
the test signal transmitting unit is used for transmitting a test signal by using the test signal transmitting link;
the first transmission parameter measuring module is used for receiving the test signal by using the rest receiving links except the test signal transmitting link and measuring the first transmission parameters of the rest receiving links;
the second transmission parameter calculation module is used for calculating a second transmission parameter of the test signal transmission link by using the first transmission parameter;
a transmission parameter determination module for determining a transmission parameter of the receive link based on the first transmission parameter and the second transmission parameter,
the transmitting port of the test signal transmitting link comprises an original radio frequency channel and an original analog-to-digital conversion port;
the second transmission parameter calculation module is used for changing a transmitting port of the test signal transmitting link to include an original radio frequency channel and a first analog-to-digital conversion port and determining a first intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and an original analog-to-digital conversion port, and determining a second intermediate value of a second transmission parameter; changing a transmitting port of a test signal transmitting link to include a first radio frequency channel and a first analog-to-digital conversion port, and determining a third intermediate value of a second transmission parameter; and determining a second transmission parameter of the test signal transmitting link by using the first transmission parameter, the first intermediate value of the second transmission parameter, the second intermediate value of the second transmission parameter and the third intermediate value of the second transmission parameter.
8. The apparatus for determining transmission parameters of a receive chain of a magnetic resonance imaging system according to claim 7,
the receiving link comprises m radio frequency channels and n analog-to-digital conversion ports; the transmitting port of the test signal transmitting link is (PIN)i，RXj) Wherein the original RF channel is PINiThe original analog-to-digital conversion port is RXj；
A second transmission parameter calculation module for changing the transmission port to (PIN)i，RXk) Measuring RXjMeasured value of column
Figure FDA0002897213140000031
And RXpMeasured value of column
Figure FDA0002897213140000032
And calculates RXjTransmit Port (PIN) in columni，RXj) Transmission parameters other than
Figure FDA0002897213140000033
As a first intermediate value of the second transmission parameter; change transmit port to (PIN)g，RXj) Measuring PINiLine measurement value thetag→iAnd PINhLine measurement value thetag→hAs a second intermediate value of the second transmission parameter; change transmit port to (PIN)g，RXk) Measurement (PIN)i，RXj) Measured value of
Figure FDA0002897213140000034
Figure FDA0002897213140000035
Measured value of
Figure FDA0002897213140000036
Measured value of
Figure FDA0002897213140000037
And (PIN)h，RXp) Measured value of
Figure FDA0002897213140000038
As a third intermediate value of the second transmission parameter, where i and g are each a positive integer no greater than m; j. k and p are respectively positive integers not greater than n; using thetag→iContained in (PIN)i，RXp) Measured value of
Figure FDA0002897213140000039
Measured value of
Figure FDA00028972131400000310
And (PIN)i，RXp) Measured value of
Figure FDA00028972131400000311
Calculation (PIN)i，RXj) Intermediate value of transmission parameter of
Figure FDA00028972131400000312
Using thetag→hContained in (PIN)h，RXp) Measured value of
Figure FDA00028972131400000313
Measured value of
Figure FDA00028972131400000314
And (PIN)h，RXp) Measured value of
Figure FDA00028972131400000315
Calculation (PIN)h，RXj) Intermediate value of transmission parameter of
Figure FDA00028972131400000316
Will be provided with
Figure FDA00028972131400000317
To thetag→iIn the process, the
Figure FDA00028972131400000318
To thetag→hPerforming the following steps; based on supplement of
Figure FDA00028972131400000319
Theta ofg→iAnd supplement with
Figure FDA00028972131400000320
Theta ofg→hAnd thetai→hComputing includes a transmit Port (PIN)i，RXj) Theta ofi→i(ii) a Will contain a transmit Port (PIN)i，RXj) Theta ofi→iA transmit Port (PIN)i，RXj) Other than that
Figure FDA00028972131400000321
Combining with the first transmission parameter to obtain the second transmission parameterAnd transmitting the parameters.
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