CN109191523A - A kind of method and apparatus in the cardiac of o n plain chest films for identification orientation - Google Patents
A kind of method and apparatus in the cardiac of o n plain chest films for identification orientation Download PDFInfo
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- CN109191523A CN109191523A CN201810965502.6A CN201810965502A CN109191523A CN 109191523 A CN109191523 A CN 109191523A CN 201810965502 A CN201810965502 A CN 201810965502A CN 109191523 A CN109191523 A CN 109191523A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10116—X-ray image
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30048—Heart; Cardiac
Abstract
The invention discloses a kind of method and apparatus in o n plain chest films cardiac orientation for identification, the method includes lung tissue profile is extracted from o n plain chest films, it calculates the slope of lung tissue profile each point and apex of the heart position is determined according to an institute calculated slope, described device includes memory and processor.The present invention can pass through the apex of the heart position in the automation equipments automatic identification o n plain chest films image such as computer, to further identify heart orientation, it avoids the need for manually observing o n plain chest films one by one to be judged and be identified, raising recognition efficiency reduces error rate.Further, corresponding alert message can also be provided according to recognition result automatically after identifying heart orientation, to remind medical worker, to improve treatment effect.The present invention is widely used in field of image recognition.
Description
Technical field
The present invention relates to field of image recognition, especially a kind of method in o n plain chest films cardiac orientation for identification
And device.
Background technique
The shooting of x-ray plain film is a kind of widely applied medical consultations means, effectively can diagnose and control by x-ray plain film
Treat a variety of diseases.O n plain chest films are the x-ray plain films for the shooting of the person's of being taken chest, can be clear by o n plain chest films
The image of the tissues such as lung tissue, heart and the soft tissue of the person of being taken is observed on ground, in addition to the image of these tissues
Except, the rest part of o n plain chest films is background.
Since tissue itself and lesion have asymmetry, the left-right position tool of o n plain chest films is distinguished
It is significant.By taking the o n plain chest films for using DR flat panel detector to shoot as an example, in actual photographed, medical worker can be by one
A shape is that the lead system label of letter r is placed on the right side of DR flat panel detector, in this way, going out captured by under the action of lead system label
The label of a R font will be will appear in the image come, this label is used to judge to be clapped in o n plain chest films by medical worker
The left and right sides of the person's of taking the photograph body.Under normal circumstances, that is, the shooting position and imaging device of the person of being taken correctly are installed
In the case of, the R font label side in o n plain chest films is the right side of the person's of being taken body.
But special circumstances are easy to happen in practice process.For example, medical worker when imaging device is installed by
Imaging device or so is overturn in work carelessness；Individual persons of being taken are due to being difficult to stand or child cries and screams and mismatches and make
With lying low etc., modes are completed to shoot, i.e., are shot using the position of anteroposterior position.Above-mentioned special circumstances will cause o n plain chest films
On R font label side be not the person's of being taken body right side.It is this in special circumstances, the normal quilt in heart orientation
Photographer shoots the o n plain chest films come, it appears that with dextrocardial o n plain chest films is the same.Therefore occur above-mentioned
After special circumstances, it is easy that the person of being taken is made to be misdiagnosed as dextrocardia, or even further result in serious medical consequences.
It needs medical worker one by one to identify o n plain chest films by naked eyes in the prior art, judges in o n plain chest films
Heart orientation, then further confirm that " dextrocardia " whether occur.Concrete operations mode is observation apex of the heart position phase
It is in which side for the person's of being taken human body middle line.But it is this be completely dependent on manually known otherwise exist low efficiency and
The disadvantages of error rate is high.Therefore it is badly in need of a kind of skill that heart orientation can be further judged by the automatic identification apex of the heart at present
Art.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the invention is that providing a kind of o n plain chest films cardiac for identification
The method and apparatus in orientation.
First technical solution adopted by the present invention is:
A method of o n plain chest films cardiac orientation for identification, comprising the following steps:
Lung tissue profile is extracted from o n plain chest films；
Calculate the slope of lung tissue profile each point；
Apex of the heart position is determined according to the calculated slope of institute.
Further, the heart is being determined with for indicating the label of the person's of being taken body dimension in the o n plain chest films
It is further comprising the steps of after sharp position:
Apex of the heart position and the label are compared, to obtain comparing result；The comparing result includes apex of the heart position
It sets to be respectively positioned on label and be located at relative to the same side of human body middle line and apex of the heart position and label relative to human body middle line
It is not ipsilateral；
Corresponding message is issued according to comparing result.
Further, the label is described to be issued accordingly according to comparing result for indicating the right side of body for the person of being taken
Message the step for specifically include:
If apex of the heart position and label are located relative to the same side of human body, issue for prompt shooting process malfunction or
The alert message of the person's person's of being taken body abnormality.
Further, described the step for lung tissue profile is extracted from o n plain chest films, specifically includes:
According to the gray scale of each point in o n plain chest films, by o n plain chest films be divided into respectively with lung tissue, soft tissue and back
The corresponding each section of scape；
The boundary in o n plain chest films between the part corresponding with soft tissue of the corresponding part of lung tissue is extracted, thus
To lung tissue profile.
Further, on getting o n plain chest films between the part corresponding with soft tissue of the corresponding part of lung tissue
Boundary after, also to it is described boundary be filtered.
Further, the method also includes following steps:
It is reference with human body middle line, lung tissue profile is divided into left part and right part.
Further, described the step for determining apex of the heart position according to the calculated slope of institute, specifically includes:
The difference of the maxima and minima of the left part each point slope is calculated, to obtain the first difference；
The difference of the maxima and minima of the right part each point slope is calculated, to obtain the second difference；
According to lung tissue profile present position corresponding to the greater in the first difference and the second difference as apex of the heart position.
Further, the human body middle line is obtained by following steps:
Longitudinal highest point of the left part of lookup lung tissue profile and longitudinally lowermost point；
Longitudinal highest point of the right part of lookup lung tissue profile and longitudinally lowermost point；
Search longitudinal highest of longitudinal highest point of the left part of lung tissue profile and the right part of lung tissue profile
Point is formed by the midpoint of the first line；
Search lung tissue profile left part longitudinally lowermost point and lung tissue profile right part it is longitudinally lowermost
Point is formed by the midpoint of the second line；
Using straight line where the midpoint of the first line and the midpoint of the second line as human body middle line.
Further, the human body middle line is obtained by following steps:
O n plain chest films are obtained in the middle line of vertical direction；
Using o n plain chest films vertical direction middle line as human body middle line.
Second technical solution adopted by the present invention is:
A kind of device in the cardiac of o n plain chest films for identification orientation, including memory and processor, the memory
For storing at least one program, the processor is for loading at least one described program to execute described in the first technical solution
Method.
The beneficial effects of the present invention are: the automation equipments automatic identification o n plain chest films image such as computer can be passed through
In apex of the heart position avoid the need for manually that observation o n plain chest films carry out one by one to further identify heart orientation
Judgement and identification, improve recognition efficiency, reduce error rate.
Further, corresponding warning can also be provided according to recognition result automatically after identifying heart orientation to disappear
Breath, to remind medical worker, to improve treatment effect.
Detailed description of the invention
Fig. 1 is the flow chart of 1 method of embodiment；
Fig. 2 is the o n plain chest films image in heart orientation to be identified；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is the o n plain chest films image of human body middle line to be identified.
Specific embodiment
Embodiment 1
A method of o n plain chest films cardiac orientation for identification, referring to Fig.1, comprising the following steps:
Lung tissue profile is extracted from o n plain chest films；
Calculate the slope of lung tissue profile each point；
Apex of the heart position is determined according to the calculated slope of institute.
It is a typical o n plain chest films image as shown in Figure 2.Lung tissue A, soft tissue B and back in o n plain chest films
The gray scale of scape C is obviously different, therefore o n plain chest films image relatively can be divided into background, soft tissue by gray scale
With lung tissue three parts, wherein lung tissue includes left part and right part.Intensity contrast is further advanced by by lung tissue A
It is determined as lung tissue profile with the boundary of soft tissue B.It, can be in order to improve accuracy rate during extracting lung tissue profile
Region corresponding to lung tissue A and soft tissue B is first subjected to binaryzation.It, can be further after extraction obtains lung tissue profile
Lung tissue profile is filtered, so that flash removed and sharp ingredient are removed, so that lung tissue profile is more smooth.
The part of D meaning is the apex of the heart in Fig. 2, and identification apex of the heart position is the key that identification heart orientation.It can be seen by Fig. 2
It arrives, other than the positions such as apex pulmonis and rib diaphragm angle, the other parts of lung tissue profile are all more straight, and the apex of the heart is corresponding
Lung tissue outline portion then bending degree with higher, i.e. the slope variation degree of the corresponding lung tissue outline portion of the apex of the heart compared with
Greatly, therefore apex of the heart position can be identified by slope.
During calculating slope, preferably just for being calculated on the inside of lung tissue profile.Lung tissue profile
Inside refers on lung tissue profile closest to the part of human body middle line.Fig. 3 is the partial enlarged view of Fig. 2, part shown in Fig. 3
Lung tissue profile is exactly the inside of entire lung tissue profile.Integrally it is divided into left part and right part pair with lung tissue profile
It answers, is also classified into left part and right part on the inside of lung tissue profile.
According to Fig. 3 it can be seen that, more curved part (right part i.e. in figure) institute in the inside of lung tissue profile
Corresponding is exactly apex of the heart position.Mathematically slope can will be calculated after each point coordinatograph of lung tissue profile, then
Slope variation the best part is confirmed as apex of the heart position.
It is further used as preferred embodiment, the step for apex of the heart position is determined according to institute's calculated slope tool
Body includes:
The difference of the maxima and minima of the left part each point slope is calculated, to obtain the first difference；
The difference of the maxima and minima of the right part each point slope is calculated, to obtain the second difference；
According to lung tissue profile present position corresponding to the greater in the first difference and the second difference as apex of the heart position.
Local investigation is carried out to Fig. 2, as shown in figure 3, it is divided into left part and right part on the inside of lung tissue profile, it is excellent
Selection of land calculates slope just for the inside each point of lung tissue profile.The first difference and the second difference are calculated separately, wherein first is poor
Value be left part each point slope maxima and minima difference, the second difference be right part each point slope maximum value with
The difference of minimum value.As shown in figure 3, calculated result will be larger for the second difference, i.e., the right part of the inside of lung tissue profile has
There is large curved degree, therefore can be determined that the apex of the heart is located at right side shown in Fig. 3.
After getting apex of the heart position, further apex of the heart position and R font label can also be compared.
In o n plain chest films, R font label have with visibly different gray scale around, therefore can be compared by gray scale or its
He comes out R font marker recognition image-recognizing method, to obtain R font label position.
According to the relationship of apex of the heart position in x-ray plain film and R font label position, can judge automatically with the presence or absence of different
Normal state.Specific judgment rule are as follows:
The apex of the heart is located at the not ipsilateral of o n plain chest films with R font label, normal condition is medically typically belonged to, at this
It may not need in the case of kind and give a warning message；
The apex of the heart and R font label are located at the same side of o n plain chest films, medically typically belong to abnormal conditions, cause
The reason of this phenomenon may be that the person of being taken belongs to dextrocardia or medical worker due to negligence at work and by relevant device or so
Overturning installation can all influence subsequent diagnosis and treatment work, it is necessary to arouse attention, therefore such case occur no matter what kind of situation it is
When can give a warning message, thus remind the medical worker person of being taken may body abnormality (dextrocardia) or shooting process go out
Wrong (relevant device or so overturning installation).
It is worth noting that the person's of being taken sheet as dextrocardia, medical worker work carelessness and by relevant device or so
Overturning is installed in simultaneous situation, in captured o n plain chest films out, the apex of the heart will be also occurred and is located at R font label
Not ipsilateral phenomenon, therefore theoretically there is a possibility that erroneous judgement in the method for the present invention, but medical statistics data are shown, dextrocardia
Disease incidence be only 0.013%-0.05%, and medical worker work carelessness cause shooting o n plain chest films during malfunction
Probability be also it is rather low, after comprehensively considering, a possibility that this erroneous judgement occurs, is minimum, can be ignored.
In the present embodiment, the description to " left side " " right side " " the same side " and " not ipsilateral " etc. of o n plain chest films is all
It is reference with the human body middle line in o n plain chest films, on human body middle line i.e. o n plain chest films where tracheae or backbone
Straight line.The method for being suitable for automatically identifying human body middle line in o n plain chest films is also disclosed in the present embodiment.
Since during shooting o n plain chest films, the position for the person of being taken and the positional relationship of relevant device have one
Determine stationarity, therefore it is substantially heavy with the central axes of o n plain chest films image to shoot the human body middle line in the o n plain chest films come
It closes, therefore the central axes of o n plain chest films image can be directly acquired as human body middle line.I.e. the first automatically identifies chest
On x-ray plain film human body middle line method the following steps are included:
O n plain chest films are obtained in the middle line of vertical direction；
Using o n plain chest films vertical direction middle line as human body middle line.
Second of method for automatically identifying human body middle line in o n plain chest films obtains the human body by following steps
Middle line:
Longitudinal highest point of the left part of lookup lung tissue profile and longitudinally lowermost point；
Longitudinal highest point of the right part of lookup lung tissue profile and longitudinally lowermost point；
Search longitudinal highest of longitudinal highest point of the left part of lung tissue profile and the right part of lung tissue profile
Point is formed by the midpoint of the first line；
Search lung tissue profile left part longitudinally lowermost point and lung tissue profile right part it is longitudinally lowermost
Point is formed by the midpoint of the second line；
Using straight line where the midpoint of the first line and the midpoint of the second line as human body middle line.
It can be according to the vertical seat of lung tissue profile each point after o n plain chest films image each point coordinatograph referring to Fig. 4
Mark is to extract.By longitudinal highest point (the corresponding point of ordinate maximum value) E1 of the left part of lung tissue profile and longitudinal direction
Longitudinal highest point (ordinate maximum value of the right part of minimum point (the corresponding point of ordinate minimum value) F1, lung tissue profile
Corresponding point) E2 and longitudinally lowermost point (the corresponding point of ordinate minimum value) F2 extract, and wherein E1 and E2 are in medical significance
The respectively apex pulmonis of two lungs of left and right, F1 and F2 are at the rib diaphragm angle that medical significance is respectively two lungs of left and right.The midpoint of E1-E2 line with
The midpoint of F1-F2 line is formed by straight line and is medically regarded as human body middle line.
Embodiment 2
Assuming that the pixel grey scale of an o n plain chest films is f (x, y) function, wherein (x, y) is each pixel coordinate.According to
Gray scale, which may is that dividing the standard in region, is classified as lung tissue for point as 20 < f (x, y) < 100, and when 110 < f (x, y) < 200
It is classified as soft tissue, background is classified as f (x, y) < 10, such combination is had lung tissue, soft tissue and background
Some gray-scale pixels are divided into three groups.
The method for extracting the boundary of lung tissue and soft tissue may is that when change dramatically occurs for adjacent pixel gray value,
Assert that the pixel is the boundary of lung tissue and soft tissue, i.e., two consecutive points (x in the horizontal directionn,yn) and (xn-1,
yn-1) meet | f (xn,yn)-f(xn-1,yn-1) | it can consider (x when > 10n,yn) and (xn-1,yn-1) between for lung tissue with soft group
The boundary knitted, and by (xn,yn) and (xn-1,yn-1) as the point on lung tissue profile.
Successively boundary point is connected, forms two lung tissue profiles.The low-pass filter that 4 rank 50Hz can be used will be outer
Short-tempered low frequency signal filters out in contouring, obtains smooth lung tissue profile, and extracts in exterior contour close to human body middle line
Inboard portion.
Calculate point (x on lung tissue profilen,yn) slope, on available lung tissue profile with point (xn,yn) adjacent
Point (xn-1,yn-1), then pass through formulaSlope k is calculatedn。
For the inside of lung tissue profile shown in Fig. 3, each point slope of its left part is calculated, obtain one group it is oblique
RateThe each point slope of its right part is calculated, one group of slope is obtainedMeter
The difference of two groups of respective maxima and minimas of slope is calculated, i.e., In actually calculating, a threshold value can be set, such as set
It is set to 30, works as dlOr drIt can determine that the apex of the heart is located at and d when greater than this threshold valuelOr drCorresponding lung tissue profile side.
Or directly to dlAnd drSize judged that the corresponding lung tissue profile side of the greater is exactly the position where the apex of the heart
It sets.
Embodiment 3
The device in the present embodiment one kind o n plain chest films cardiac orientation for identification, including memory and processor, institute
Memory is stated for storing at least one program, the processor is for loading at least one described program to execute embodiment 1
Or 2 the method for embodiment.
The present embodiment device may be also connected to the equipment such as DR flat panel detector or Film scanner, to obtain chest
The electronic image of x-ray plain film is handled for processor.
To sum up, the beneficial effects of the present invention are:
Can by the apex of the heart position in the automation equipments automatic identification o n plain chest films image such as computer, from
And further identify heart orientation, it avoids the need for manually observing o n plain chest films one by one to be judged and be identified, raising identification
Efficiency reduces error rate；
Corresponding alert message can also be provided according to recognition result automatically after identifying heart orientation, to medical matters
Personnel remind, to improve treatment effect.
It is to be illustrated to preferable implementation of the invention, but the implementation is not limited to the invention above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of method in o n plain chest films cardiac orientation for identification, which comprises the following steps:
Lung tissue profile is extracted from o n plain chest films；
Calculate the slope of lung tissue profile each point；
Apex of the heart position is determined according to the calculated slope of institute.
2. a kind of method in o n plain chest films cardiac orientation for identification according to claim 1, the chest x-ray
With for indicating the label of the person's of being taken body dimension on plain film, which is characterized in that after determining apex of the heart position, further include
Following steps:
Apex of the heart position and the label are compared, to obtain comparing result；The comparing result include apex of the heart position with
Label is respectively positioned on to be located at relative to human body middle line not relative to the same side of human body middle line and apex of the heart position and label
It is ipsilateral；
Corresponding message is issued according to comparing result.
3. a kind of method in o n plain chest films cardiac orientation for identification according to claim 2, the label are used for
Indicate the right side of body for the person of being taken, which is characterized in that described the step for issuing corresponding message according to comparing result is specific
Include:
If apex of the heart position and label are located relative to the same side of human body, issue for prompt shooting process malfunction or by
The alert message of photographer's body abnormality.
4. a kind of method in o n plain chest films cardiac orientation for identification according to claim 1, which is characterized in that
Described the step for lung tissue profile is extracted from o n plain chest films, specifically includes:
According to the gray scale of each point in o n plain chest films, by o n plain chest films be divided into respectively with lung tissue, soft tissue and background pair
The each section answered；
The boundary in o n plain chest films between the part corresponding with soft tissue of the corresponding part of lung tissue is extracted, to obtain lung
Tissue contours.
5. a kind of method in o n plain chest films cardiac orientation for identification according to claim 4, which is characterized in that
After boundary on getting o n plain chest films between the part corresponding with soft tissue of the corresponding part of lung tissue, also to institute
Boundary is stated to be filtered.
6. special according to a kind of described in any item methods in o n plain chest films cardiac orientation for identification of claim 2-5
Sign is, further comprising the steps of:
It is reference with human body middle line, lung tissue profile is divided into left part and right part.
7. a kind of method in o n plain chest films cardiac orientation for identification according to claim 6, which is characterized in that
Described the step for determining apex of the heart position according to the calculated slope of institute, specifically includes:
The difference of the maxima and minima of the left part each point slope is calculated, to obtain the first difference；
The difference of the maxima and minima of the right part each point slope is calculated, to obtain the second difference；
According to lung tissue profile present position corresponding to the greater in the first difference and the second difference as apex of the heart position.
8. a kind of method in o n plain chest films cardiac orientation for identification according to claim 6, which is characterized in that
The human body middle line is obtained by following steps:
Longitudinal highest point of the left part of lookup lung tissue profile and longitudinally lowermost point；
Longitudinal highest point of the right part of lookup lung tissue profile and longitudinally lowermost point；
Search longitudinal highest point institute of longitudinal highest point of the left part of lung tissue profile and the right part of lung tissue profile
The midpoint of the first line formed；
Search longitudinally lowermost institute of the longitudinally lowermost point of the left part of lung tissue profile and the right part of lung tissue profile
The midpoint of the second line formed；
Using straight line where the midpoint of the first line and the midpoint of the second line as human body middle line.
9. a kind of method in o n plain chest films cardiac orientation for identification according to claim 2, which is characterized in that
The human body middle line is obtained by following steps:
O n plain chest films are obtained in the middle line of vertical direction；
Using o n plain chest films vertical direction middle line as human body middle line.
10. a kind of device in o n plain chest films cardiac orientation for identification, which is characterized in that including memory and processor,
The memory is wanted for storing at least one program, the processor for loading at least one described program with perform claim
Seek any one of 1-9 the method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110473180A (en) * | 2019-07-31 | 2019-11-19 | 南方医科大学南方医院 | Recognition methods, system and the storage medium of respiratory chest motion |
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