CN102631222A

CN102631222A - CPU (Central Processing Unit)-based ultrasonic imaging scanning transform method

Info

Publication number: CN102631222A
Application number: CN2012101271942A
Authority: CN
Inventors: 丁波; 朱逸斐; 王建和
Original assignee: ZHUHAI YIKAI ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: ZHUHAI YIKAI ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2012-04-26
Filing date: 2012-04-26
Publication date: 2012-08-15
Anticipated expiration: 2032-04-26
Also published as: CN102631222B

Abstract

The invention discloses a CPU (Central Processing Unit)-based ultrasonic imaging scanning transform method which comprises the steps of: obtaining scanning data, dividing the scanning data into n*m parts of rectangles, dividing the obtained rectangles into triangles, finishing coordinate transform, and sequentially drawing each triangle to obtain a scanning transformed image. The transform method disclosed by the invention finishes the scanning transform on the condition of not increasing the system cost or complexity on the basis of CPU and provides better instantaneity and image quality, and the method disclosed by the invention can be finished by cheapest hardware, thereby not only reducing the cost, but also having simple hardware structure, so that the method is more suitable for miniaturization; and meanwhile, the hardware structure is simple, so that the integral power consumption is much smaller than that of the traditional systems, and the environmental-friendly conception is satisfied.

Description

Ultra sonic imaging scan conversion method based on the GPU realization

Technical field

The present invention relates to the medical ultrasound imaging technology, the ultra sonic imaging scan conversion method of particularly realizing based on GPU (Graphics Process Unit) graph processing technique.

Background technology

The transducer of most Abdominal B type ultrasonography probe is segmental, so be polar coordinate system from the resulting scan-data of transducer.We need convert polar coordinate to rectangular coordinate and could show when on screen, showing.Scan conversion is a process that transforms to rectangular coordinate system from polar coordinate system in essence.As illustrated in fig. 1 and 2, the scanning probe direction is θ, and depth direction is d, the data of scanning gained be s (θ, d), through coordinate transform, with data conversion to the xy plane down i (x, y), specifically transformation for mula is:

x=?(d0+d)sin(θ)

y=?(d0+d)cos(θ)

Coordinate transform is an operation very consuming time.In order to reach the requirement of real-time,, also be very heavy to the burden of CPU even adopt look-up table.Usually need very high performance CPU, do not adopt bilinear interpolation, perhaps adopt DSP or FPGA auxiliary.

But these methods all have shortcoming: 1) the common cost of high performance CPU is very high, and can't make device miniaturization; 2) do not adopt bilinear interpolation can save a part of amount of calculation, but make picture quality that obvious decline is arranged yet; 3) adopt DSP or FPGA not only to increase cost, also increased the complexity of system simultaneously.

Summary of the invention

To the problems referred to above, the present invention provides a kind of and realizes fast, low-cost, the high performance ultra sonic imaging scan conversion method of realizing based on GPU.

The technical scheme that the present invention is adopted for its technical problem of solution is:

Ultra sonic imaging scan conversion method based on GPU realizes may further comprise the steps: obtain scan-data s (θ, d); (θ d) is divided into the n equal portions in the θ direction, is divided into the m equal portions in the d direction, forms the rectangle of n*m part with scan-data s; With the rectangle triangulation that obtains, (the coordinate transform relation is: x=(d0+d) sin (θ), y=(d0+d) cos (θ) for θ, d) the corresponding triangular apex coordinate on the xy plane of planar triangle with s in calculating; S (θ; D) as the texture of GPU, the θ direction is the u coordinate of texture, and the d direction is the v coordinate of texture; The coordinate of xy plane triangle is as the apex coordinate of GPU; Corresponding u coordinate and the v coordinate of xy plane triangle is texture coordinate, and each triangle is drawn successively, obtains scan conversion image later.

Further, the value of n and m is to be not less than 10 integer.

Become two trianglees according to the rectangle diagonal division when further, rectangle is divided into triangle.

Further, obtain scan-data s (θ, d) texture of the good correspondence size of back establishment earlier; (θ d) is divided into and calculates good each vertex of a triangle and texture coordinate behind the triangle scan-data s, and summit and texture coordinate exist in the internal memory; Open the bilinear interpolation switch of GPU during drafting; The scan-data that receives is uploaded to the good texture of establishment in advance, bind this texture, draw triangle one by one with calculating good summit and texture coordinate in advance.

The invention has the beneficial effects as follows: the present invention is based on GPU under the prerequisite that does not increase system cost and complexity, accomplish scan conversion, better real-time property and picture quality are provided; Method of the present invention can use the most cheap hardware to accomplish, and not only reduce cost, and hardware configuration is simple; Be more suitable for miniaturization; Because hardware configuration is simple, overall power also can be little more a lot of than system in the past, meet the theory of environmental protection simultaneously.

Description of drawings

Further explain below in conjunction with the accompanying drawing and the specific embodiment:

Fig. 1 is the polar coordinate system scan-data figure before the conversion;

Fig. 2 is the rectangular coordinate system scan-data figure after the conversion;

Fig. 3 is divided into leg-of-mutton scan-data figure for the polar coordinate system before the conversion;

Fig. 4 is divided into leg-of-mutton scan-data figure for the rectangular coordinate system after the conversion.

The specific embodiment

With reference to Fig. 1,2,3 and 4, the ultra sonic imaging scan conversion method of realizing based on GPU of the present invention is used for converting the scan-data under the resulting polar coordinate system of transducer to can show at screen rectangular coordinate system data.Describe in the face of detailed step of the present invention down.

Obtain scan-data s (θ, step d), as shown in Figure 1 because these data generate by slanted transducer, so this scan-data s that gets access to (θ is under the polar coordinate system d), and these data must be transformed under the rectangular coordinate system and could show.

Step with the scan-data division: (θ d) is divided into the n equal portions in the θ direction, is divided into the m equal portions in the d direction, forms the rectangle of n*m part with scan-data s.Usually, it is enough big that the number needs of division is wanted, and could form the rectangle of n*m part, and in general embodiment, the data of n, m preferably are not less than 10 integer.

Divide triangle and the step of calculating the triangular apex coordinate: with the rectangle triangulation that obtains; Calculate and s (θ; D) the corresponding triangular apex coordinate on the xy plane of planar triangle, the coordinate transform relation is: x=(d0+d) sin (θ), y=(d0+d) cos (θ).4) work as m, when n was enough big, we can think that in triangle, the coordinate transform of each point is a linear distribution.GPU why is divided into triangle, because generally can only draw by diabolo.As preferred embodiment, when being divided into triangle, rectangle becomes two trianglees according to the rectangle diagonal division.The sketch map that is divided into is as shown in Figure 3.

The step of drawing: s (θ, d) as the texture of GPU, the θ direction is the u coordinate of texture; The d direction is the v coordinate of texture; The coordinate of xy plane triangle is as the apex coordinate of GPU, and corresponding u coordinate and the v coordinate of xy plane triangle is texture coordinate, and each triangle is drawn successively; Obtain scan conversion image later, as shown in Figure 4.

In the practical implementation process, the API that can select for use Direct3D to quicken as GPU.When the API that selects for use Direct3D to quicken as GPU realizes this method; The following mode of general employing is carried out: obtain scan-data s (θ, the d) texture of the good correspondence size of back establishment earlier, scan-data s (θ; D) be divided into and calculate good each vertex of a triangle and texture coordinate behind the triangle; Summit and texture coordinate exist in the internal memory, open the bilinear interpolation switch of GPU during drafting, the scan-data that receives is uploaded to create good texture in advance; Bind this texture, draw triangle one by one with calculating good summit and texture coordinate in advance.

Embodiment of the present invention is not restricted to the described embodiments, as long as it reaches technique effect of the present invention with essentially identical means, all should belong to protection scope of the present invention.

Claims

1. the ultra sonic imaging scan conversion method of realizing based on GPU is characterized in that may further comprise the steps:

Obtain scan-data s (θ, d);

(θ d) is divided into the n equal portions in the θ direction, is divided into the m equal portions in the d direction, forms the rectangle of n*m part with scan-data s;

With the rectangle triangulation that obtains, (the coordinate transform relation is: x=(d0+d) sin (θ), y=(d0+d) cos (θ) for θ, d) the corresponding triangular apex coordinate on the xy plane of planar triangle with s in calculating;

S (θ; D) as the texture of GPU, the θ direction is the u coordinate of texture, and the d direction is the v coordinate of texture; The coordinate of xy plane triangle is as the apex coordinate of GPU; Corresponding u coordinate and the v coordinate of xy plane triangle is texture coordinate, and each triangle is drawn successively, obtains scan conversion image later.

2. the ultra sonic imaging scan conversion method of realizing based on GPU according to claim 1, the value that it is characterized in that n and m is to be not less than 10 integer.

3. the ultra sonic imaging scan conversion method of realizing based on GPU according to claim 1 becomes two trianglees according to the rectangle diagonal division when it is characterized in that rectangle is divided into triangle.

4. the ultra sonic imaging scan conversion method of realizing based on GPU according to claim 1; It is characterized in that obtaining scan-data s (θ, the d) texture of the good correspondence size of back establishment earlier, scan-data s (θ; D) be divided into and calculate good each vertex of a triangle and texture coordinate behind the triangle; Summit and texture coordinate exist in the internal memory, open the bilinear interpolation switch of GPU during drafting, the scan-data that receives is uploaded to create good texture in advance; Bind this texture, draw triangle one by one with calculating good summit and texture coordinate in advance.