CN100507945C - Fault image segmentation method for images scanned from films - Google Patents

Fault image segmentation method for images scanned from films Download PDF

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Publication number
CN100507945C
CN100507945C CNB2006100227114A CN200610022711A CN100507945C CN 100507945 C CN100507945 C CN 100507945C CN B2006100227114 A CNB2006100227114 A CN B2006100227114A CN 200610022711 A CN200610022711 A CN 200610022711A CN 100507945 C CN100507945 C CN 100507945C
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faultage
image
scale
faultage image
reference point
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CN101004834A (en
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吴章文
罗正明
勾成俊
杨代伦
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Sichuan University
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Sichuan University
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Abstract

A method for dividing tomograph in scanned image of CT film includes confirming resolution of reference tomography, selecting tomograph to be divided, using scale end point of reference tomography as reference point, locking relative position relation of rectangular frame to scale reference point, conforming resolution of the other tomography and carrying out convergent-divergent on the other tomograph as per set ratio, using scale end point of the other tomography as reference to confirm rectangular frame position in the other tomograph and using region surrounded by said frame as tomograph to be divided.

Description

The dividing method of CT film scanning image interrupting layer image
Technical field
The present invention relates to Medical Image Processing, particularly a kind of dividing method of CT film scanning image interrupting layer image.
Background technology
In some hospitals, be the sole mode that obtains human dissection information with the digitizing of CT film image by Film scanner.Usually, be arranged with some CT faultage images on a film.Therefore, before three-dimensional reconstruction, at first faultage image to be split from the film scanning image one width of cloth width of cloth.For the ease of processing such as three-dimensional reconstructions, based on the software systems of medical image, requiring medical image usually is tomographic sequence parallel to each other, but also requires tomographic sequence to be consistent on ratio, angle and position.
In existing solution, the consistance of angular relationship obtains by rotation film scanning image.This requires same the faultage image angle on the CT film that deviation must not be arranged, otherwise need rotate every width of cloth CT faultage image.On the every width of cloth CT faultage image scale is arranged, be divided into certain width of cloth faultage image,, then redefine scale, the consistance on like this can the assurance ratio if scale changes.Define a rectangle frame, its area surrounded is the effective coverage of faultage image, moves the corresponding region of this rectangle frame to each faultage image, makes on each faultage image position to be consistent.This method is because with ratio, angle and position three aspect separate processes, so efficient is low, weak effect.
Obtain the human dissection information that needs, the quantity of medical image often nearly tens, the width of cloth up to a hundred.In order effectively to shorten sliced time, improve user's efficient, a kind of conveniently dividing method is provided, have important practical significance.
Summary of the invention
The objective of the invention is: a kind of CT film scanning image partition method is provided, faultage image one width of cloth width of cloth ground can be split from the film scanning image.
For achieving the above object, the dividing method of CT film scanning image interrupting layer image may further comprise the steps:
The first step, according to the length of the actual representative of scale, and the pixel coordinate of two end points on scan image, determine resolution with reference to faultage image;
In second step, use rectangle frame on the reference faultage image, the faultage image that selected needs are cut apart;
The 3rd step, will be with reference to scale end points on the faultage image as the reference point, the relative position relation of locking rectangle frame and scale reference point;
The 4th step, determine the resolution of other faultage images by the method for the first step, the resolution divided by the reference faultage image obtains scaling, according to scaling other faultage images is carried out convergent-divergent, and itself and scale with reference to faultage image are consistent;
The 5th step, go on foot the definite locking rectangle frame and the relative position relation of scale reference point according to the 3rd, with on other faultage images with the reference faultage image on the corresponding scale end points of reference point be reference, determine the position of rectangle frame in other faultage images, the rectangle frame area surrounded is the faultage image that need cut apart.
The 6th the step, repeated for the 4th, the 5th step, up to whole one one width of cloth of other faultage images split.
The dividing method of CT film scanning image interrupting layer image of the present invention is that reference point and rectangle frame associate with the end points of scale, the mouse button of only need clicking, the quick location that can realize faultage image.Simultaneously used automatic identification technology on the scale end points, bearing accuracy has also improved.The introducing of scale reference point notion has guaranteed the width of cloth width of cloth faultage image that splits to have good consistance on ratio and direction.Therefore, the present invention has very high application, has important use to be worth in radiotherapy treatment planning system, medical image visualization system, magic magiscan.
Description of drawings
Fig. 1 is a CT film scanning image to be split;
Fig. 2 is the reference faultage image that a width of cloth indicates rectangle frame, scale and reference point;
Fig. 3 is the width of cloth width of cloth faultage image after cutting apart;
Among the figure, 1-faultage image, 2-rectangle frame, 3-scale P a, P b-reference point.
Embodiment
Below in conjunction with accompanying drawing, the dividing method to CT film scanning image interrupting layer image of the present invention is further described in detail and describes.
Fig. 1 is a CT film scanning image to be split.Among the figure, be arranged with some CT faultage images on the CT film.Therefore, before three-dimensional reconstruction, at first faultage image to be split from the film scanning image one width of cloth width of cloth.
In the present embodiment, the dividing method concrete steps of faultage image are:
1), according to the length of the actual representative of scale, and the pixel coordinate of two end points on scan image determined the resolution with reference to faultage image;
CT film scanning image is made in the CT film scanning, the piece image in the faultage image that wherein needs to cut apart as the reference image, is discerned this two end points with reference to the faultage image scale, automatically as two reference point P aAnd P bTwo end points of the scale on the CT film, the pixel coordinate on scan image is respectively P a(x 1, y 1) and P b(x 2, y 2).The physical length of scale representative is d.Then the resolution r of reference picture is:
r = d ( x 1 - x 2 ) 2 + ( y 1 - y 2 ) 2 mmpp - - - ( 1 )
Resolution r is each pixel, i.e. the length of pixel representative.Determined the transformational relation of this reference picture pixel unit like this, promptly represented the every pixel of millimeter at this mmpp to physical unit.
2), with rectangle frame on the reference faultage image, the faultage image that selected needs are cut apart;
On the reference faultage image, with the selected interested rectangular area of rectangle frame, the faultage image that splits as needs.This rectangle frame pixel coordinate be Rect (left, top, right, bottom).
The size of cutting apart faultage image is: w=right-left, h=bottom-top
The physical size of cutting apart faultage image is: (right-left) * r, (bottom-top) * r
Fig. 2 is the reference faultage image that a width of cloth indicates rectangle frame, scale and reference point;
3), will lock the relative position relation of rectangle frame and scale reference point with reference to scale end points on the faultage image as the reference point;
With lower extreme point P in two end points of scale aAs the reference point, the relative position of locking rectangle frame and scale reference point.
Rectangle frame is with respect to reference point P aOffset ▿ x = left - x 1 ▿ y = top - y 1 - - - ( 2 )
left = x 1 + ▿ x
right = x 1 + ▿ x + w
The rectangle frame position can be by reference point P aThe position determine (3)
top = y 1 + ▿ y
bottom = y 1 + ▿ y + h
Fig. 2 is the reference faultage image that a width of cloth indicates rectangle frame, scale and reference point.
4), by the 1st) method in step determines the resolution of other faultage images, the resolution divided by the reference faultage image obtains scaling, according to scaling other faultage images is carried out convergent-divergent, and itself and scale with reference to faultage image are consistent;
Automatically two end points discerning other faultage image scales are as two reference point P a, and P b,, in like manner, get resolution r ' by formula (1).
Scaling is: scale = r ′ r - - - ( 4 )
Other faultage images by formula (4) scaling of obtaining carry out convergent-divergent, make the resolution of other faultage images and resolution with reference to faultage image be consistent, and promptly scale is consistent.When scaling less than 1, other faultage images are amplified, when scaling greater than 1, other faultage images are dwindled.
5), according to the 3rd) the locking rectangle frame determined of step and the relative position relation of scale reference point, with scale end points corresponding with reference point on the reference faultage image on other faultage images is reference, determine the position of rectangle frame in other faultage images, the rectangle frame area surrounded is the faultage image that need cut apart.
6), repeat the 4th), 5) step, up to whole one one width of cloth of other faultage images split.
Fig. 3 is the width of cloth width of cloth faultage image after cutting apart.Shown in the figure, the faultage image ratio, angle and the position consistency that split, the three-dimensional of being convenient to the CT image makes up, and three-dimensional reflection human anatomic structure is convenient to doctor's diagnosis.
In addition, in the present embodiment, an end points that has only used scale is as the zone of determining that other faultage images need be cut apart.Owing to there is different faultage image angles deviation to some extent, will there be inconsistent situation in the faultage image that splits.Therefore,, calculate the angle of scale and Y-axis, carrying out the 3rd equally according to the pixel coordinate of two end points correspondences of scale) step and the 5th) go on foot before, respectively reference faultage image and other faultage images have been carried out vertical correction.
In faultage image, two end points of accepted scale lock the relative position relation of rectangle frame and scale reference point as the reference point; Be reference point with two end points of scale in other faultage images again, determine the position of rectangle frame in other faultage images, the rectangle frame area surrounded is the faultage image that need cut apart.At this moment, need not carry out vertical correction, but should comparatively vertically or only carry out vertical correction the reference faultage image with reference to faultage image.
In the present invention, the identification problem that relates to two end points of scale.In the present embodiment, adopt following steps that it is discerned:
1), near the 20*20 neighborhood set point is asked histogram, to determine threshold value;
2), make region growing, with point near the 5*5 neighborhood this set point the bianry image of scale
3), the bianry image that obtains is made thinning processing, till refinement again
4), do the line detection of level and vertical direction with the method for template matches
5), the intersection point ordering of the line segment of vertical direction and horizontal direction line segment, under is Pa, that go up most is Pb.
Identification for two end points of scale belongs to prior art, and the present invention does not give unnecessary details.
The dividing method of CT film scanning image interrupting layer image of the present invention is not limited to the scope of embodiment, and present embodiment just helps to understand the present invention, and all utilize innovation and creation that the present invention conceives all at the row of protection.

Claims (4)

1. the dividing method of a CT film scanning image interrupting layer image is characterized in that, may further comprise the steps:
1), according to the length and the pixel coordinate of two end points on scan image of the actual representative of scale, determine resolution with reference to faultage image;
2), with rectangle frame on the reference faultage image, the faultage image that selected needs are cut apart;
3), will lock the relative position relation of rectangle frame and scale reference point with reference to scale end points on the faultage image as the reference point;
4), by the 1st) method in step determines the resolution of other faultage images, the resolution divided by the reference faultage image obtains scaling, according to scaling other faultage images is carried out convergent-divergent, and itself and scale with reference to faultage image are consistent;
5), according to the 3rd) the locking rectangle frame determined of step and the relative position relation of scale reference point, on other faultage images, with two end points of the corresponding scale of reference point on the reference faultage image be reference point, determine the position of rectangle frame in other faultage images, the rectangle frame area surrounded is the faultage image that need cut apart;
6), repeat the 4th), 5) step, up to whole one one width of cloth of other faultage images split.
2. the dividing method of faultage image according to claim 1 is characterized in that, described resolution is the length of each pixel representative.
3. the dividing method of faultage image according to claim 1 is characterized in that, is carrying out the 3rd) step and the 5th) before the step, respectively reference faultage image and other faultage images have been carried out vertical correction; Will be with reference to an end points of scale end points on the faultage image as the reference point, the relative position relation of locking rectangle frame and scale reference point.
4. the dividing method of faultage image according to claim 1 is characterized in that, in faultage image, two end points of accepted scale lock the relative position relation of rectangle frame and scale reference point as the reference point; With scale reference point in other faultage images, determine the position of rectangle frame in other faultage images again, the rectangle frame area surrounded is the faultage image that need cut apart.
CNB2006100227114A 2006-12-29 2006-12-29 Fault image segmentation method for images scanned from films Expired - Fee Related CN100507945C (en)

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