CN111991018A - Method of displaying tomographic image, method and apparatus for indicating range of CT value of tomographic image - Google Patents

Method of displaying tomographic image, method and apparatus for indicating range of CT value of tomographic image Download PDF

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Publication number
CN111991018A
CN111991018A CN201910448382.7A CN201910448382A CN111991018A CN 111991018 A CN111991018 A CN 111991018A CN 201910448382 A CN201910448382 A CN 201910448382A CN 111991018 A CN111991018 A CN 111991018A
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values
tomographic image
range
level
displaying
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周玮
田毅
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Shanghai Siemens Medical Devices Co ltd
Siemens Shanghai Medical Equipment Ltd
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Shanghai Siemens Medical Devices Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/46—Arrangements for interfacing with the operator or the patient
    • A61B6/461—Displaying means of special interest
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data

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Abstract

The invention discloses a method for displaying a tomographic image, a method for indicating a range of CT values of the tomographic image, a related computer readable medium and a computer tomography apparatus. The method for displaying a tomographic image includes: displaying a histogram of CT values corresponding to the tomographic image and displaying the tomographic image with a preset window width and window level; receiving a range of CT values of interest; calculating a desired window width and level from the range of CT values of interest; displaying the tomographic image at the desired window width and level. The invention displays the histogram of the CT value while displaying the tomographic image, thereby supplementing more information. The user may enter a range of CT values of interest and view the automatically adjusted tomographic image for the corresponding window width level until a satisfactory position. On the other hand, if the window width and the window level of the tomographic image are changed, the position of the corresponding CT value range in the entire CT value range can be visually observed.

Description

Method of displaying tomographic image, method and apparatus for indicating range of CT value of tomographic image
Technical Field
The present invention relates to computed tomography, and in particular to the display of tomographic images.
Background
In the application of a computer tomography device, the CT values are converted into grey values to be displayed on a display. The CT values range from-1024 HU to +3071HU, i.e., 4096 gray levels. However, typical displays use 8-bit gray levels, i.e., 256 different gray levels, which are difficult to adequately and comprehensively represent CT image information.
In the CT image diagnosis process, in order to appropriately display a region Of interest (roi) Of an observer in an image on a display, generally, setting and adjusting a display window are performed. The CT values above the window are displayed in white, the CT values below the window are displayed in black, and the CT values within the window are mapped to the entire gray scale of the display device.
The above method is also deficient. Many times, an observer needs to clearly understand the corresponding relationship between the display gray scales of the current different images and the actual CT values, and also needs to have an overview over all the CT values of the CT images, that is, to know the position of the current display gray scale interval in the whole CT value range of the CT images. More importantly, in order to better display the image ROI, it is often necessary that the observer has to frequently and manually adjust the center and width of the display window, which is laborious and time-consuming.
Disclosure of Invention
In view of the above, the present invention proposes a method of displaying a tomographic image, a method of indicating a range of CT values of a tomographic image, a related computer readable medium, and a computed tomography apparatus.
According to a first aspect of the present invention, there is provided a method of displaying a tomographic image, comprising: displaying a histogram of CT values corresponding to the tomographic image and displaying the tomographic image with a preset window width and window level; receiving a range of CT values of interest; calculating a desired window width and level from the range of CT values of interest; displaying the tomographic image at the desired window width and level.
In an embodiment, prior to receiving the range of CT values of interest, the method further comprises: calculating the range of the corresponding CT value according to the preset window width and window level; and indicating the range of the CT value corresponding to the preset window width and the preset window level on the histogram.
In an embodiment, the receiving the range of CT values of interest comprises receiving a range of CT values adjusted on the histogram.
In one embodiment, said calculating desired window widths and levels from said range of CT values of interest comprises calculating desired window widths and levels according to:
WW_expected＝CTmax–CTmin
WL_expected＝CTmin+(CTmax–CTmin)/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limits of the range of CT values of interest, WL _ expected, WW _ expected, respectively, the desired window level and window width.
In an embodiment, after calculating the desired window width and level from the range of CT values of interest, the method further comprises: indicating the desired window width and level.
In one embodiment, the method further comprises: and displaying a gray scale of the tomographic image, wherein the gray scale marks CT value scales.
According to a second aspect of the present invention, there is provided a method of indicating a range of CT values of a tomographic image, comprising: displaying a histogram of CT values corresponding to the tomographic image and displaying the tomographic image with a first window width and a first window level; calculating a range of CT values from the first window width and the first window level; indicating the range of CT values on the histogram.
In one embodiment, said calculating a range of CT values based on said first window width and first window level comprises calculating a range of CT values based on the following equation:
CTmax＝WL+WW/2
CTmin＝WL-WW/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limit of the range of CT values, and WL, WW, respectively, the first window level and the window width.
In one embodiment, the method further comprises: and displaying a gray scale of the tomographic image, wherein the gray scale marks CT value scales.
According to a third aspect of the present invention there is provided a computer-readable medium having computer-executable instructions for implementing a method as described above.
According to a fourth aspect of the invention, a computer tomography apparatus is provided, comprising a computer readable medium as described above.
The method of displaying a tomographic image, the method of indicating a range of CT values of a tomographic image, the related computer readable medium, and the computed tomography apparatus of the present invention display a histogram of CT values while displaying a tomographic image, and thus can supplement more information. The user may enter a range of CT values of interest and view the automatically adjusted tomographic image for the corresponding window width level until a satisfactory position. On the other hand, if the window width and the window level of the tomographic image are changed, the position of the corresponding CT value range in the entire CT value range can be visually observed.
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The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a method of displaying a tomographic image according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a tomographic image and a histogram according to a first embodiment of the present invention.
Fig. 3 is a flowchart of a method of indicating a range of CT values of a tomographic image according to a second embodiment of the present invention.
Fig. 4 is a schematic diagram of a tomographic image and a histogram according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
Fig. 1 is a flowchart of a method 100 of displaying a tomographic image according to a first embodiment of the present invention. The method 100 of displaying a tomographic image includes step S102, step S108, step S110, and step S112.
In step S102, a histogram of CT values corresponding to the tomographic image is displayed and the tomographic image is displayed with a preset window width and window level. Fig. 2 is a schematic diagram of a tomographic image and a histogram according to a first embodiment of the present invention, in which the left image is a tomographic image and the right image is a histogram of CT values. Preferably, before step S108, the method 100 further includes step S104 and step S106. in step S104, the corresponding CT value range is calculated according to the preset window width and window level. In step S106, a preset window width and a range of CT values corresponding to the window level are indicated on the histogram.
In step S108, a range of CT values of interest is received. As shown in fig. 2, the user may drag the upper and lower limits of the CT values on the histogram. In other embodiments, dragging a scroll bar, etc. may also be used.
In step S110, a desired window width and level is calculated from the range of CT values of interest. In this embodiment, the desired window width and level are calculated according to the following equation:
WW_expected＝CTmax–CTmin
WL_expected＝CTmin+(CTmax–CTmin)/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limits of the range of CT values of interest, WL _ expected, WW _ expected, respectively, the desired window level and window width.
In step S112, the tomographic image is displayed with a desired window width and window level. The tomographic image on the left side of fig. 2 assumes the desired window width and level.
Preferably, the method 100 further comprises step S114. in step S114, the desired window width and level are indicated. In this way, the user can know what the current window width and level are.
Preferably, the method 100 further includes a step S116. in the step S116, a gray bar of the tomographic image, which marks a scale of the CT value, is displayed. As shown in the left image of fig. 2, the right side of the tomographic image shows the corresponding gray scale bar, by which the doctor can know the corresponding relationship between the gray scale and the CT value.
Fig. 3 is a flowchart of a method 200 of indicating a range of CT values of a tomographic image according to a second embodiment of the present invention. The method 200 of indicating the range of CT values of a tomographic image includes steps S202, S204, and S206.
In step S202, a histogram of CT values corresponding to the tomographic image is displayed and the tomographic image is displayed with a first window width and a first window level. Fig. 4 is a schematic diagram of a tomographic image and a histogram according to a second embodiment of the present invention.
In step S204, a corresponding range of CT values is calculated based on the first window width and the first window level. In this embodiment, the range of CT values is calculated according to the following equation:
CTmax＝WL+WW/2
CTmin＝WL-WW/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limit of the range of CT values, and WL, WW, respectively, the first window level and the first window width.
In step S206, the range of CT values is indicated on the histogram.
Preferably, the method 200 further comprises step S208. In step S208, a gradation bar of the tomographic image is displayed, the gradation bar indicating a CT value scale. As shown in fig. 4, the right side of the tomographic image shows a corresponding gray bar, by which the doctor can know the correspondence between the gray and the CT value. As shown in the right graph of fig. 4, the CT values displayed by the current gray image (left graph of fig. 4) indicated on the histogram are between-50 Hu and +130 Hu. Meanwhile, the CT value scale of the gray bar on the right side of the left image of FIG. 4 is also adjusted from-50 Hu to +130 Hu.
The position and range of the indicated CT value interval in the histogram and the CT value scale of the gray scale bar are dynamically changed along with the change of the width window level of the tomographic image display window.
According to yet another aspect of the present invention, there is provided a computer-readable medium having computer-executable instructions for implementing the method as described above.
According to a further aspect of the present invention, there is provided a computer tomography apparatus comprising the computer readable medium as described above.
The method of displaying a tomographic image, the method of indicating a range of CT values of a tomographic image, the related computer readable medium, and the computed tomography apparatus of the present invention display a histogram of CT values while displaying a tomographic image, and thus can supplement more information. The user may enter a range of CT values of interest and view the automatically adjusted tomographic image for the corresponding window width level until a satisfactory position. On the other hand, if the window width and the window level of the tomographic image are changed, the position of the corresponding CT value range in the entire CT value range can be visually observed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (11)

1. A method of displaying a tomographic image, comprising:
displaying a histogram of CT values corresponding to the tomographic image and displaying the tomographic image with a preset window width and window level;
receiving a range of CT values of interest;
calculating a desired window width and level from the range of CT values of interest;
displaying the tomographic image at the desired window width and level.
2. The method of claim 1, wherein prior to receiving the range of CT values of interest, the method further comprises:
calculating the range of the corresponding CT value according to the preset window width and window level;
and indicating the range of the CT value corresponding to the preset window width and the preset window level on the histogram.
3. The method of claim 2, wherein said receiving a range of CT values of interest comprises receiving a range of CT values adjusted on said histogram.
4. The method of claim 1, wherein said calculating desired window widths and levels based on said range of CT values of interest comprises calculating desired window widths and levels based on:
WW_expected＝CTmax–CTmin
WL_expected＝CTmin+(CTmax–CTmin)/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limits of the range of CT values of interest, WL _ expected, WW _ expected, respectively, the desired window level and window width.
5. The method of claim 1, wherein after calculating a desired window width and level based on the range of CT values of interest, the method further comprises:
indicating the desired window width and level.
6. The method of claim 1, further comprising:
and displaying a gray scale of the tomographic image, wherein the gray scale marks CT value scales.
7. A method of indicating a range of CT values for a tomographic image, comprising:
displaying a histogram of CT values corresponding to the tomographic image and displaying the tomographic image with a first window width and a first window level;
calculating a range of CT values from the first window width and the first window level;
indicating the range of CT values on the histogram.
8. The method of claim 7, wherein said calculating a range of CT values based on said first window width and first window level comprises calculating a range of CT values based on the following equation:
CTmax＝WL+WW/2
CTmin＝WL-WW/2
wherein, CTmaxAnd CTminRespectively, the upper and lower limit of the range of CT values, and WL, WW, respectively, the first window level and the window width.
9. The method of claim 7, further comprising:
and displaying a gray scale of the tomographic image, wherein the gray scale marks CT value scales.
10. A computer-readable medium having computer-executable instructions for implementing the method of any one of claims 1 to 9.
11. A computed tomography apparatus comprising the computer readable medium of claim 10.
CN201910448382.7A 2019-05-27 2019-05-27 Method of displaying tomographic image, method and apparatus for indicating range of CT value of tomographic image Pending CN111991018A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111803104A (en) * 2020-07-20 2020-10-23 上海市第六人民医院 Medical image display method, medium and electronic equipment

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US20110069875A1 (en) * 2008-05-28 2011-03-24 Hitachi Medical Corporation Image processing device, image processing method, and image processing program
JP2013165855A (en) * 2012-02-16 2013-08-29 Hitachi Medical Corp Medical image display device and image display method
JP2013215221A (en) * 2012-04-04 2013-10-24 Fujifilm Corp Image processing device, image processing method and program
CN109069093A (en) * 2016-04-12 2018-12-21 三星电子株式会社 The device and method for handling computed tomography images

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2003061949A (en) * 2001-08-24 2003-03-04 Ge Medical Systems Global Technology Co Llc Region extraction method, region extraction device and x-ray ct apparatus
US20110069875A1 (en) * 2008-05-28 2011-03-24 Hitachi Medical Corporation Image processing device, image processing method, and image processing program
JP2013165855A (en) * 2012-02-16 2013-08-29 Hitachi Medical Corp Medical image display device and image display method
JP2013215221A (en) * 2012-04-04 2013-10-24 Fujifilm Corp Image processing device, image processing method and program
CN109069093A (en) * 2016-04-12 2018-12-21 三星电子株式会社 The device and method for handling computed tomography images

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111803104A (en) * 2020-07-20 2020-10-23 上海市第六人民医院 Medical image display method, medium and electronic equipment

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