CN104873196B - Method and device for selecting medical image scanning range - Google Patents
Method and device for selecting medical image scanning range Download PDFInfo
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- CN104873196B CN104873196B CN201410069687.4A CN201410069687A CN104873196B CN 104873196 B CN104873196 B CN 104873196B CN 201410069687 A CN201410069687 A CN 201410069687A CN 104873196 B CN104873196 B CN 104873196B
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Abstract
The invention discloses a method and a device for selecting a medical image scanning range, wherein the selection method comprises the following steps: carrying out positioning scanning on the inspection area to obtain a positioning map; acquiring magnetic field uniformity information of the inspection area, and obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information; forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map; adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map. The method and the device for selecting the scanning range of the medical image, provided by the invention, are used for carrying out positioning scanning on the examination region, and forming the composite image by simultaneously loading the positioning diagram and the magnetic field uniformity characteristic diagram of the examination region, so that a user can conveniently adjust the scanning range of the examination region, and the scanning range is ensured to be positioned in the magnetic field uniformity region.
Description
Technical Field
The present invention relates to image scanning methods and apparatuses, and particularly to a method and an apparatus for selecting a scanning range of a medical image.
Background
In medical image scanning, the uniformity of a magnetic field can influence the imaging effect, the magnetic field uniformity is good, and the imaging effect can be better. However, the uniformity of each magnet is different, and therefore, the user needs to be guided to select the most uniform region for scanning according to the field calibration and the magnetic field uniformity data of the patient calibration to achieve the best effect.
Scanning is currently performed by moving the scanning position to the center of the magnet, since it is generally believed that the magnetic field at the center of the magnet is the most uniform. However, different magnets have large uniformity areas and bad edge uniformity, which is difficult for users to judge. Thus, there is no way to avoid these areas when planning the scan area.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for selecting a medical image scanning range, which can scan an examination area and simultaneously load and display a positioning diagram and a magnetic field uniformity characteristic diagram, thereby facilitating a user to adjust the scanning range of a hospital image and ensuring that the scanning range is located in the uniform area of a magnetic field.
The technical scheme adopted by the invention for solving the technical problems is to provide a method for selecting a medical image scanning range, which comprises the following steps: carrying out positioning scanning on the inspection area to obtain a positioning map; acquiring magnetic field uniformity information of the inspection area, and obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information; forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map; adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map.
The method for selecting the scanning range of the medical image is described above, wherein the scout map is a cross-sectional image, a sagittal image and/or a coronal image.
The method for selecting the scanning range of the medical image is characterized in that the magnetic field uniformity information of the examination region is obtained by a 3D compensation sequence or a 3D-DESS sequence scanning before the scanning to obtain the location map.
The method for selecting the scanning range of the medical image comprises the following steps of: transmitting at least two radio frequency wave scan sequences in an examination region; acquiring phase diagrams obtained by the at least two radio frequency wave scanning sequences at different echo times; subtracting the two phase images to obtain a phase difference image; and acquiring magnetic field uniformity information according to the phase difference diagram.
The method for selecting the scanning range of the medical image comprises the following steps of: transmitting a sequence of radio frequency wave scans in an examination region; acquiring at least two phase diagrams at different echo times through the radio frequency wave scanning sequence; subtracting the two phase images to obtain a phase difference image; and acquiring magnetic field uniformity information according to the phase difference diagram.
The method for selecting the scanning range of the medical image is described above, wherein the magnetic field uniformity information is main magnetic field B0 uniformity description information.
In the method for selecting the scanning range of the medical image, a composite image formed by the positioning map and the magnetic field uniformity characteristic map is displayed on a graphic positioning selection interface.
The present invention further provides a device for selecting a scanning range of a medical image, which comprises:
positioning the image scanning unit: carrying out positioning scanning on the inspection area to obtain a positioning map;
magnetic field uniformity detection unit: acquiring magnetic field uniformity information of the inspection area, and obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information;
an image superimposing unit: forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map;
an image adjustment display unit: adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map.
The above medical image scanning range selection device, wherein the image adjustment display unit includes a human-machine interface unit, and the human-machine interface unit provides a graphic positioning selection interface.
Compared with the prior art, the invention has the following beneficial effects: the method and the device for selecting the medical image scanning range scan an examination region, form a composite image by simultaneously loading the positioning diagram and the magnetic field uniformity characteristic diagram of the examination region, and guide a user to plan scanning based on the composite image of the positioning diagram and the magnetic field uniformity characteristic diagram, so that the user can conveniently adjust the scanning range of the medical image, and the scanning range is ensured to be positioned in the uniform region of a magnetic field.
Drawings
FIG. 1 is a schematic view of a medical image scanning range selection process according to the present invention;
FIG. 2 is a schematic diagram of the magnetic field uniformity profile formed by calibrating the acquired magnetic field data according to the present invention;
fig. 3 is a block diagram of a device for selecting a scanning range of a medical image according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 is a schematic flow chart of the selection of the medical image scanning range according to the invention.
Referring to fig. 1, the method for selecting a scanning range of a medical image according to the present invention includes the following steps:
step S1: and carrying out positioning scanning on the examination area to obtain a positioning map. And selecting a reference layer for scanning examination according to the position and the range of the human body to obtain a positioning map. Depending on the different slice orientations selected, the localizer can accordingly be a cross-sectional image, a sagittal image, and/or a coronal image.
Step S2: acquiring magnetic field uniformity information of the inspection area, and obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information; the magnetic field uniformity information is the main magnetic field B0 uniformity description information.
The acquisition of the uniformity information of the magnetic field in the inspection area can be measured by an echo phase difference method, and the echo phase difference method has multiple modes, wherein the specific process of the mode one is as follows:
transmitting at least two radio frequency wave scan sequences in an examination region;
acquiring phase diagrams obtained by the at least two radio frequency wave scanning sequences at different echo times;
subtracting the two phase maps to obtain a phase difference map, wherein the lighter the color of the phase difference map of the two echoes shown in FIG. 2 is, the larger the phase difference is, and the more uneven the magnetic field is;
and acquiring magnetic field uniformity information according to the phase difference diagram.
The specific process of the second mode is as follows:
transmitting a sequence of radio frequency wave scans in an examination region;
acquiring at least two phase diagrams at different echo times through the radio frequency wave scanning sequence;
subtracting the two phase images to obtain a phase difference image;
and acquiring magnetic field uniformity information according to the phase difference diagram.
If the echo phase difference method is used, the phase difference map can be used as the magnetic field uniformity characteristic map. In the implementation process of the invention, the information of the magnetic field uniformity can also be obtained by adopting a method similar to the echo phase difference method, so as to obtain a characteristic diagram of the magnetic field uniformity.
When a human body enters the magnet, the main magnetic field is influenced. In order to make the magnetic field uniformity characteristic map more accurate, the magnetic field uniformity is preferably measured by using, for example, a 3D shim sequence (3D compensation sequence) and a 3D-DESS sequence (3D double echo steady-state sequence), so as to obtain the magnetic field uniformity information. There are various ways other than the above 3 dsim, for example: and obtaining the magnetic field uniformity information by using a special field measuring tool, a water model and the like. And then obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information.
Step S3: forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map; for example, the scan positioning map of the examination region is loaded, and the magnetic field uniformity characteristic map corresponding to the position information of the positioning map is displayed on the positioning map in an overlapped mode according to the scan position information of the positioning map (the image formed by overlapping the positioning map and the magnetic field uniformity characteristic map is called as a composite image). To facilitate user selection of an adjustment display area, for example: the magnetic field uniformity characteristic diagram is displayed in a lighter color on a positioning diagram of a graphical positioning interface GLI (graphics Localized interface).
Step S4: adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map; and (3) adjusting the scanning range on the basis of the positioning diagram and the magnetic field uniformity characteristic diagram by the user on the graphical positioning interface, so that the scanning range is positioned in the uniform region of the magnetic field, if the scanning region is selected, the scanning range is arranged in the region which is uniform in all directions as much as possible, and then formal scanning imaging of the medical image is carried out.
Fig. 3 is a block diagram of a device for selecting a scanning range of a medical image according to the present invention.
With continued reference to fig. 3, the present invention further provides a device for selecting a scanning range of a medical image, comprising:
positioning image scanning unit 301: carrying out positioning scanning on the inspection area to obtain a positioning map;
magnetic field uniformity detection unit 302: acquiring magnetic field uniformity information of the inspection area, and obtaining a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information;
the image superimposing unit 303: forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map;
image adjustment display unit 304: adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map; the image adjusting and displaying unit comprises a man-machine interface unit, and the man-machine interface unit provides a graphic positioning selection interface. The image processing unit may be implemented by various existing integrated processing chips or software processing modules, which are not described herein again.
In summary, the present invention obtains the field calibration and the patient calibration magnetic field uniformity data through a specific sequence, such as 3 dsim, and the like, then performs the positioning scan on the examination region, and forms a composite image by simultaneously loading and displaying the positioning diagram and the magnetic field uniformity characteristic diagram of the examination region, so that the user can set the optimal FOV according to the composite image of the positioning diagram and the magnetic field uniformity characteristic diagram, that is, the user is guided to select the most uniform region for scanning, thereby achieving the optimal scanning effect.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for selecting a medical image scanning range to overcome the defect that a user is difficult to judge how large uniform areas of different magnets are and how bad the edge uniformity is, is characterized by comprising the following steps: carrying out positioning scanning on the inspection area to obtain a positioning map; the positioning diagram is obtained by selecting a reference layer for scanning inspection according to the position and the range of the human body to be scanned and carrying out positioning scanning;
acquiring magnetic field uniformity information of the inspection area, and acquiring a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information, wherein the magnetic field uniformity characteristic diagram comprises a magnetic field uniform area and a non-uniform area;
forming a composite image by overlapping the positioning chart of the inspection area and the magnetic field uniformity characteristic chart, wherein the composite image is displayed on a graphic positioning selection interface;
on a graphic positioning selection interface, adjusting a scanning range of a medical image based on the composite image such that the scanning range is within a magnetic field homogeneity region of the magnetic field homogeneity map.
2. The method for selecting a medical image scanning range according to claim 1, wherein the scout map is a cross-sectional image, a sagittal image, and/or a coronal image.
3. The method for selecting a medical image scanning range as claimed in claim 1, wherein the magnetic field homogeneity information of the examination region is obtained by a 3D compensation sequence or a 3D-DESS sequence scan before the scan yields a scout map.
4. The method for selecting a medical image scanning range according to claim 1, wherein the magnetic field uniformity information obtaining process is as follows:
transmitting at least two radio frequency wave scan sequences in an examination region;
acquiring phase diagrams obtained by the at least two radio frequency wave scanning sequences at different echo times;
subtracting two phase images acquired by two arbitrary different echo times to obtain a phase difference image;
and acquiring magnetic field uniformity information according to the phase difference diagram.
5. The method for selecting a medical image scanning range according to claim 1, wherein the magnetic field uniformity information obtaining process is as follows:
transmitting a sequence of radio frequency wave scans in an examination region;
acquiring at least two phase diagrams at different echo times through the radio frequency wave scanning sequence;
subtracting two phase images acquired by two arbitrary different echo times to obtain a phase difference image;
and acquiring magnetic field uniformity information according to the phase difference diagram.
6. A method of selecting a scanning range of a medical image as claimed in claim 1, characterized in that said magnetic field homogeneity information is a main magnetic field B0 homogeneity description information.
7. The method for selecting the scanning range of a medical image according to claim 1, wherein the composite image formed by the localization map and the magnetic field uniformity characteristic map is displayed on a graphical localization selection interface.
8. A device for selecting a scanning range of a medical image, which overcomes a defect that it is difficult for a user to judge how large uniform areas of different magnets are and how bad edge uniformity is, comprising:
positioning the image scanning unit: carrying out positioning scanning on the inspection area to obtain a positioning map; the positioning diagram is obtained by selecting a reference layer for scanning inspection according to the position and the range of the human body to be scanned and carrying out positioning scanning;
magnetic field uniformity detection unit: acquiring magnetic field uniformity information of the inspection area, and acquiring a magnetic field uniformity characteristic diagram according to the magnetic field uniformity information, wherein the magnetic field uniformity characteristic diagram comprises a magnetic field uniform area and a non-uniform area;
an image superimposing unit: forming a composite image by superposing the positioning map of the examination region and the magnetic field uniformity characteristic map;
an image adjustment display unit: adjusting a scan range of a medical image based on the composite image such that the scan range is within a magnetic field homogeneity region of the magnetic field homogeneity map.
9. The apparatus for selecting a medical image scanning range according to claim 8, wherein the image adjustment display unit includes a human machine interface unit providing a graphical positioning selection interface.
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| JP2007282860A (en) * | 2006-04-17 | 2007-11-01 | Univ Of Tsukuba | Magnetic resonance imaging device and method |
| DE102008044844B4 (en) * | 2008-08-28 | 2018-08-30 | Siemens Healthcare Gmbh | A method of determining a depletion map for use in positron emission tomography and homogeneity information of the magnetic resonance magnetic field |
| WO2013155606A1 (en) * | 2012-04-19 | 2013-10-24 | National Research Council Of Canada | Method for b0 field correction in magnetic resonance |
| DE102012208325A1 (en) * | 2012-05-18 | 2013-11-21 | Siemens Aktiengesellschaft | Automatic positioning and adaptation in a calibration procedure for a Shim field map based on AutoAlign and AutoCoverage |
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Address after: 201815 No. 2258 Chengbei Road, Jiading Industrial Zone, Shanghai, Jiading District Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201815 No. 2258 Chengbei Road, Jiading Industrial Zone, Shanghai, Jiading District Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |