CN112526418B - Data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging - Google Patents
Data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging Download PDFInfo
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- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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Abstract
The invention discloses a data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, which reminds operators of data abnormality through abnormal changes of data background colors, data line diagrams and data radar diagrams in the data recording process, and reminds the operators of checking and correcting, so that erroneous measurement data and abnormal data can be found in time in the measuring process, and the correction can be performed in time, thereby saving time and avoiding subsequent errors caused by data errors.
Description
Technical Field
The invention relates to a data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging.
Background
The magnetic resonance imaging technology is an advanced medical imaging technology, has no harm to human body, and is widely applied to diagnosis of diseases of various parts of human body and corresponding scientific research in the clinical medical field. The magnet part is the most basic and important core component of the magnetic resonance imaging system and is used for generating a uniform background magnetic field.
Magnetic field homogeneity refers to the identity of the magnetic field, i.e. whether the number of magnetic lines passing through a unit area is the same, within specific volume limits, which is critical for magnetic resonance imaging. In a magnetic resonance imaging system, homogeneity is measured in parts per million (ppm) of the main magnetic field as a unit of deviation. It is thus seen that the magnetic field homogeneity is dependent on whether a good magnetic resonance image can be obtained. Therefore, there is a need for ways to improve the homogeneity of the magnetic field of a magnetic resonance imaging system.
To improve the uniformity of the magnetic field of the magnet, the existing magnetic field is measured to obtain the data of the current magnetic field, and then the distribution of the magnetic field is changed through corresponding calculation, so that the uniformity of the magnetic field is improved. Changing the magnetic field distribution is to increase or decrease small iron pieces or magnetic materials at specific positions for the permanent magnets; for electromagnets and superconducting magnets, the magnitude and direction of the current to the compensation coils or shim coils is added. Regardless of the magnet, it is necessary to obtain the correct magnetic field distribution data.
The magnetic field is measured by special equipment (Gaussian meter) and a magnetic field probe, the magnetic field intensity at different places in the magnetic field can be measured by moving the probe, so that the distribution of the magnetic field in a range is obtained, and then the computer program is used for calculation to obtain how to increase or decrease magnetic materials (for permanent magnets) or change the current intensity of a shimming coil (electromagnet or superconducting magnet) so as to improve the uniformity of the magnetic field. In general, the magnetic field intensity of the probe at each position is recorded one by one, and then the calculation is performed after the test is completed.
After the probe moves each point to be measured, the Gaussian meter is stabilized, and then the magnetic field intensity is locked, so that the read magnetic field intensity data is valid. Meanwhile, the probe moving and fixing fixture also needs a certain time, and at least 200 data points are needed for the whole measurement, because the magnetic field intensity of different positions in the magnet is different, particularly for a superconducting magnet with strong field intensity, particularly for a small-caliber superconducting magnet with ultra-high field intensity, such as 7.0T, the magnetic field intensity is greatly changed in space, and the data cannot be read by simply controlling the Gaussian meter through a computer. So that the magnetic field intensity is usually recorded manually one by one at the point to be measured. Meanwhile, because a full-automatic device for controlling the movement of the probe is not suitable, the movement of the probe needs to be controlled manually. Thus, the entire measurement process typically requires 2 individuals to coordinate, approximately 5-6 hours to complete. Because a large number of magnetic field intensities of the to-be-measured points are manually recorded or input into a computer, the operator can easily cause error data or recording errors of the magnetic field intensities due to long-time simple actions. If some data errors are found in the data processing process after the whole measurement process is finished, much time is required for the re-measurement, and the whole measurement can be invalid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, which is used for timely finding out data points with misreading or input errors in the data recording process, reminding operators of correcting, and preventing time waste caused by finding out some data errors in the later data processing process.
The technical scheme for achieving the purpose is as follows: a data recording and processing method for magnetic field homogeneity measurement for magnetic resonance imaging, comprising the steps of:
S1, the whole magnetic field measurement data recording format on a computer is divided into three areas, wherein the upper left part is a data recording area, the right part is a data drawing area, and the lower left part is a data analysis area; the data recording area is provided with a data recording table, and the number of rows and the number of columns of the data recording table are determined according to the magnetic field to be measured; the data drawing area is provided with a data line graph and a data radar graph;
S2, fixing the magnetic field probe on a mechanical device, enabling the magnetic field probe to rotate around a central axis of a magnetic field, wherein the column number of a data record table in a data record area indicates the position of the magnetic field probe on the central axis of the magnetic field, and the row number indicates the corresponding rotation angle of the magnetic field probe; measuring magnetic field measurement data when the magnetic field probe rotates for one angle, so that a plurality of magnetic field measurement data can be obtained after one rotation and recorded in one column of a data record table; after the magnetic field measurement data is input into the data recording area, the corresponding data line graph and the data radar graph are automatically displayed in the data drawing area;
S3, in the process of inputting magnetic field measurement data, if the data which are being input have great changes with the data which are being input before, the background color of the data which are being input corresponding to the data recording area is suddenly changed, and a data line diagram and a data radar diagram in the data drawing area are also greatly jumped; reminding an operator to check whether the data being input is correct, real data, error reading or error input, and confirming or correcting timely;
S4, after the input of a series of magnetic field measurement data is completed, the data analysis area analyzes the magnetic field measurement data of the part, and calculates the average value, the maximum value and the minimum value of the part, thereby obtaining the uniformity of the part; after all the magnetic field measurement data are input, the average value, the maximum value, the minimum value and the uniformity of the whole measurement area are calculated.
The data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, wherein the data recording area is set by a conditional format, so that the background color of the data in the whole data recording area is automatically adjusted according to the size of the input data, and the corresponding background colors of the data are sequentially changed from the minimum to the maximum.
The data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, wherein coordinate axes are drawn in advance in a data line graph and a data radar graph, and when magnetic field measurement data is input into a data recording area, images are automatically displayed in the data line graph and the data radar graph.
The data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, wherein the data recording table is 24 rows and 9 columns, the 9 columns of the data recording table indicate the positions of the magnetic field probes on the central axis of the magnetic field, and the 24 rows indicate the corresponding rotation angles of the magnetic field probes; the magnetic field probe measures a magnetic field measurement data every 15 degrees of rotation, so that 24 magnetic field measurement data can be obtained by one rotation and recorded in a column of a data record table
The data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging provided by the invention can be used for timely finding out the data points with misreading or inputting errors in the data recording process, reminding operators to correct, and preventing time waste caused by finding out some data errors in the later data processing process.
Drawings
FIG. 1 is a graph of an entire magnetic field measurement data record prior to a magnetic field uniformity measurement;
FIG. 2 is a graph of magnetic field measurement data recorded when an anomaly occurs when 195 degrees are measured during a magnetic field uniformity measurement;
Fig. 3 is a graph of the entire magnetic field measurement data record after the magnetic field uniformity measurement.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following detailed description is provided with reference to the accompanying drawings:
Referring to fig. 1,2 and 3, a data recording and processing method for magnetic field homogeneity measurement for magnetic resonance imaging according to a preferred embodiment of the present invention comprises the steps of:
S1, the whole magnetic field measurement data recording format on a computer is divided into three areas, wherein the upper left part is a data recording area 1, the right part is a data drawing area 3, and the lower left part is a data analysis area 2; the data recording area 1 is provided with 24 rows and 9 columns of data recording tables, and the data recording area 1 is set through a conditional format, so that the background color of the data in the whole data recording area is automatically adjusted according to the size of the input data, and the corresponding background colors of the data are changed from the minimum to the maximum in sequence; the data drawing area 3 is provided with a data line graph and a data radar graph, coordinate axes are drawn in the data line graph and the data radar graph in advance, and when magnetic field measurement data are input into the data recording area, images are automatically displayed in the data line graph and the data radar graph;
S2, fixing the magnetic field probe on a mechanical device, enabling the magnetic field probe to rotate around a central axis of a magnetic field, and displaying the position of the magnetic field probe on the central axis of the magnetic field by a 9-row list of a data recording table in a data recording area, wherein 24 rows indicate the corresponding rotation angle of the magnetic field probe; measuring magnetic field measurement data every 15 degrees of rotation of the magnetic field probe, so that 24 magnetic field measurement data can be obtained after one rotation, and the 24 magnetic field measurement data are recorded in one column of a data record table; after the magnetic field measurement data is input into the data recording area 1, a corresponding data broken line graph and a data radar graph are automatically displayed in the data drawing area 3;
S3, in the process of inputting magnetic field measurement data, if the data which are being input and the data which are input before are changed greatly, the background color of the corresponding data which are being input in the data recording area 1 is suddenly changed, and a data line diagram and a data radar diagram in the data drawing area 3 are greatly jumped; reminding an operator to check whether the data being input is correct, real data, or error reading or error input, and timely confirming or correcting;
S4, after the input of a series of magnetic field measurement data is completed, the data analysis area 2 analyzes the magnetic field measurement data of the part, and calculates the average value, the maximum value and the minimum value of the part, so that the uniformity of the part is obtained; after all the magnetic field measurement data are input, the average value, the maximum value, the minimum value and the uniformity of the whole measurement area are calculated.
Referring again to fig. 2, in the magnetic field uniformity measurement process, when 195 degrees are measured, the magnetic field measurement data 4 is significantly smaller than the other data in the column, and the background color of the data is automatically displayed as green at this time, which is significantly different from the other data. At the same time, a very pronounced abrupt change occurs in the data fold line 5 of the data-drawing area 3 and in the curve on the data radar 6. These all alert the operator to check if this data is authentic or misread or misinput.
Referring to fig. 3 again, the whole magnetic field measurement data is input. In the data drawing area 3, all data are visually displayed on the drawing. In the data analysis area 2, the maximum, minimum and average values 7 of the magnetic field of the column (i.e. a circle in the magnetic field) have been calculated below each column of data. At the lowest part of the data analysis area 2, the homogeneity 8 of the whole magnetic field is also obtained.
According to the data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging, the number of rows and the number of columns of the data recording table are determined according to the magnetic field to be measured, and in the data recording process, operators are reminded of checking and correcting through abnormal change of the data background color, the data line diagram and the data radar diagram, so that time waste caused by finding some data errors in the later data processing process is prevented.
In summary, the data recording and processing method for magnetic field uniformity measurement of magnetic resonance imaging of the present invention can timely find out the wrong reading or inputting the wrong data point during the data recording process, remind the operator to correct, and prevent the time waste caused by finding out some data errors during the later data processing process.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (4)
1. A data recording and processing method for magnetic field homogeneity measurement for magnetic resonance imaging, comprising the steps of:
s1, the whole magnetic field measurement data recording format on a computer is divided into three areas, wherein the upper left part is a data recording area, the right part is a data drawing area, and the lower left part is a data analysis area; the data recording area is provided with a data recording table, and the number of rows and the number of columns of the data recording table are determined according to the magnetic field to be detected; the data drawing area is provided with a data line graph and a data radar graph;
s2, fixing the magnetic field probe on a mechanical device capable of enabling the magnetic field probe to rotate around a central axis of a magnetic field, wherein the column number of a data record table in a data record area indicates the position of the magnetic field probe on the central axis of the magnetic field, and the column number indicates the corresponding rotation angle of the magnetic field probe; measuring magnetic field measurement data when the magnetic field probe rotates for one angle, so that a plurality of magnetic field measurement data can be obtained after one rotation and recorded in one column of a data record table; after the magnetic field measurement data is input into the data recording area, the corresponding data line graph and the data radar graph are automatically displayed in the data drawing area;
s3, in the process of inputting magnetic field measurement data, if the data which are being input and the data which are being input are greatly changed, the background color of the data which are being input corresponding to the data recording area is suddenly changed, and a data line diagram and a data radar diagram in the data drawing area are greatly jumped; reminding an operator to check whether the data being input is correct, real data, or error reading or error input, and timely confirming or correcting;
s4, after the input of a series of magnetic field measurement data is finished, the data analysis area analyzes the series of magnetic field measurement data, and the average value, the maximum value and the minimum value of the series of magnetic field measurement data are calculated, so that the uniformity of the series of magnetic field measurement data is obtained; after all the magnetic field measurement data are input, the average value, the maximum value, the minimum value and the uniformity of the whole measurement area are calculated.
2. The data recording and processing method for magnetic field uniformity measurement for magnetic resonance imaging according to claim 1, wherein the setting is performed in a conditional format in the data recording area such that the background color of the data in the entire data recording area is automatically adjusted according to the size of the input data, and the data sequentially changes from the minimum to the maximum corresponding background color.
3. The data recording and processing method for magnetic field uniformity measurement for magnetic resonance imaging according to claim 1, wherein coordinate axes are drawn in advance in the data line graph and the data radar graph, and when the magnetic field measurement data is inputted into the data recording area, an image is dynamically and automatically displayed in the data line graph and the data radar graph at any time.
4. The method of claim 1, wherein the data recording table is 24 rows and 9 columns, the 9 columns of the data recording table indicate the positions of the magnetic field probes on the central axis of the magnetic field, and the 24 rows indicate the corresponding rotation angles of the magnetic field probes; the magnetic field measuring data are measured every 15 degrees of rotation of the magnetic field probe, so that 24 magnetic field measuring data can be obtained by one rotation, and the 24 magnetic field measuring data are recorded in one column of the data record table.
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