CN103190925A

CN103190925A - X-ray device

Info

Publication number: CN103190925A
Application number: CN2012105993685A
Authority: CN
Inventors: R·格劳曼
Original assignee: Siemens AG
Current assignee: Siemens Healthineers AG
Priority date: 2011-12-13
Filing date: 2012-12-13
Publication date: 2013-07-10
Anticipated expiration: 2032-12-13
Also published as: DE102011088392A1; CN103190925B; DE102011088392B4

Abstract

An X-ray device has a C-arm mounted to a fastener and pivoted around a rotating point. An X-ray source and an X-ray detector are arranged at the C-arm. The C-arm (4, 14) is rotatable along a circular path, whose radius is the sum of the radius of the C-arm (4, 14) and the half width of the X-ray detector (6). The C-arm is formed in a circle segment-shape.

Description

X-ray instrument

Technical field

The present invention relates to a kind of x-ray instrument, have one and be installed in C shape arm on the support, that can center on a swivel point rotation, an x-ray source and an X-ray detector are installed in above the described C shape arm.

Background technology

By the x-ray instrument of this pattern, can reappear 3-D view the two-dimensional projection from the patient body position that different projectional angles are taken from a series of.

The precondition of three-dimensional imaging is normally: one along orbiting motion and around the isocentric C shape arm of a fixing swivel point (rotating shaft) rotation.Isocentric being characterised in that, the central beam of X ray is passed through swivel point all the time.But isocentric C shape arm has many shortcomings aspect mass distribution and based on its higher relatively weight, therefore, often uses the non-isocentric C shape arm shorter than isocentric C shape arm when two-dimensional imaging.

A kind of x-ray instrument of suggestion in DE10003524A1, in described x-ray instrument, in order to take two-dimensional projection by the position of the C shape arm of in the category of calibration, calculating, in a calibration mode, make a series of two-dimensional projections of a phantom, from two-dimensional projection, generate three-dimensional image data sets.

In DE102008062030A1, once introduce, in an x-ray instrument that comprises a non-isocentric C shape arm imaging area of a target along an elliptical orbit by around, the volume area of target is restricted whereby significantly.If want to avoid this shortcoming, need level or vertical mobile C shape arm.

Summary of the invention

The technical problem to be solved in the present invention is, a kind of x-ray instrument that comprises non-isocentric C shape arm is provided, and described x-ray instrument is applicable to three-dimensional imaging.

In order to solve the problems of the technologies described above, according to the present invention's regulation, C shape arm can rotate along circular trace in the x-ray instrument of the described type of this paper preface, and the radius of described circular trace is equivalent to half width sum of radius and the X-ray detector of C shape arm.

In traditional x-ray instrument, have only when x-ray instrument has isocentric C shape arm, just can carry out three-dimensional imaging, still, described C shape arm is owing to require gravitational equilibrium obviously bigger and heavier than non-isocentric C shape arm.

Theoretical foundation of the present invention is, if a non-isocentric C shape arm also can be finished three-dimensional imaging by described non-isocentric C shape arm along a circular trace rotation that is different from the circular shape of C shape arm.Especially requirement is used for the radius of circular trace of C shape arm rotation greater than the radius of C shape arm, and the radius that the radius of circular trace must be equivalent to C shape arm adds half width sum of X-ray detector.If described geometrical condition is satisfied, the central beam of the X ray swivel point of extend past C shape arm all the time then.Can generate a 3-D view from a plurality of two dimensional images of taking in different projectional angles under this precondition, gravitational equilibrium is guaranteed simultaneously.

In according to x-ray instrument of the present invention, preferred, C shape arm is installed on the support by a rolling guide.Described rolling guide can be realized accurately controlling the ground rotating C-shaped arm and make C shape arm with respect to the support location of x-ray instrument.

In according to x-ray instrument of the present invention, rolling guide comprises the side groove, and the parts of support are settled within it.In this version, C shape arm surrounds the parts of support, produces a kind of stable especially frame for movement thus.

Another expansion design code of the present invention, the side groove in the described C shape arm are located the lateral surface setting near described C shape arm near the medial surface setting of described C shape arm and in the outer end of described C shape arm at the center of described C shape arm.The position of described side groove can change on the thickness direction of C shape arm, and the change in location of groove is the result of the following fact, that is, C shape arm has different radiuses with C shape arm along its circular trace that moves.The thickness of C shape arm, that is, its extension size at thickness direction (radial direction) here is chosen as, and makes guide rail or side groove inner and outer at the place, outer end of described C shape arm at the center of described C shape arm.

In order to improve the operation according to X ray of the present invention, can stipulate that C shape arm is gravity balance.Can reduce or eliminate moment by gravity balance, the words of side must not taked other counter-measure.Can stipulate that in this respect C shape arm has depression near its outer end.Can realize reducing quality by this method, this has positive effect to desired driving energy aspect.

Can reach gravity balance by this way in according to x-ray instrument of the present invention, that is, by depression and described side groove adjacency, especially depression can be arranged on the side groove along thickness direction, wherein, depression was shorter than side groove.

Description of drawings

To describe other advantage of the present invention and details by embodiment and accompanying drawing below.

Fig. 1 represents one according to x-ray instrument of the present invention;

Fig. 2 represents that x-ray instrument shown in Figure 1 is in the second position;

Fig. 3 represents that x-ray instrument shown in Figure 1 is in the 3rd position;

Fig. 4 represents according to the C shape arm of x-ray instrument of the present invention and X ray central beam;

Fig. 5 to Fig. 7 represents the cross section of C shape arm shown in Figure 1; And

Fig. 8 to Figure 10 represents the cross section of the C shape arm of another embodiment.

The specific embodiment

X-ray instrument 1 shown in Figure 1 comprise one be installed on the support 2, can be installed on the described C shape arm around 4, one x-ray sources 5 of C shape arm and X-ray detector 6 of swivel point 3 (rotating shaft) rotation.An X ray central beam 7 extends to X-ray detector 6 from x-ray source 5.

C shape arm 4 is to be fixed on the support 2 by a rolling guide that is not shown specifically 8.C shape arm 4 can enter different positions by rotation, thereby can make a two dimensional image that checks object respectively.Can utilize these single two dimensional images to make 3-D view subsequently.

Fig. 2 shows the x-ray instrument after C shape arm 4 produces from position shown in Figure 1 along clockwise direction, and this type of this, Fig. 3 shows C shape arm 4 along the contrary x-ray instrument of clockwise direction after position shown in Figure 1 is produced.Therefrom as can be seen, with C shape arm 4 location independent ground at that time, X ray central beam 7 is passed the swivel point 3 of C shape arm 4 all the time.Therefore, this x-ray instrument 1 has and a performance that the x-ray instrument that comprises isocentric C shape arm is identical.Because its moulding, the C shape arm 4 of x-ray instrument 1 is not isocentric, and still, the special design structure by guide rail can realize that X ray central beam 7 is passed the swivel point 3 of C shape arm 4 all the time.Therefore, can utilize single, be in the two dimensional image that diverse location takes at C shape arm 4 and make 3-D view subsequently.

What Fig. 4 showed is that no matter where C shape arm 4 is in, X ray central beam 7 is passed the swivel point 3 of C shape arm 4 all the time, therefore, substitutes an isocentric C shape arm and can use a non-isocentric C shape arm.But, to compare with an isocentric C shape arm, non-isocentric C shape arm has advantage aspect weight.

Guide rail to the C shape arm 4 on the support 2 makes an explanation below.Figure 1 illustrates a circular arc 9 on C shape arm 4, what described circular arc illustrated is the position of a groove, mobile in support 2 guidings by the described C shape of this groove arm 4.As can be seen, circular arc 9 extends near its medial surface at the center of C shape arm 4 in Fig. 1.State circular arc 9 in the place, outer end that is provided with x-ray source 5 and X-ray detector 6 of C shape arm 4 near the lateral surface extension of C shape arm 4.

What Fig. 5 to Fig. 7 showed is the cross-sectional view of C shape arm 4.Fig. 5 shows is the profile that illustrates of cutting open along V-V line shown in Figure 4, and therewith correspondingly, Fig. 6 shows is that what to cut that the profile that illustrates and Fig. 7 show open along the VI-VI line is to cut the profile that illustrates open along VII-VII line shown in Figure 4.

The cross section of the C shape arm 4 shown in Fig. 5 is c-shaped basically, what be arranged in parallel with the interlude 10 of C shape arm 4 is side groove 11, rolling guide is in the described side groove when being in installment state, rotatably is supported on the support 2 by the described C shape of this rolling guide arm 4.In Fig. 5, side groove 11 adjoins described interlude 10.

Fig. 6 shows is that C shape arm 4 is cut the profile that illustrates open along the V-VI line.Side groove 11 is identical with the side groove shown in Fig. 5, and still, side groove 11 is positioned at a different position in profile shown in Figure 6, that is, and and near the center.Therewith correspondingly, interlude 12 is wideer than the corresponding interlude 10 among Fig. 5.

Fig. 7 shows is that C shape arm 4 is cut the profile that illustrates open along the VII-VII line.There, side groove 11 is positioned near the outside.Therewith correspondingly, interlude 13 is wideer than the corresponding interlude 12 among Fig. 6.

The effect that can reach by the 11 different radial positions of side groove is, although the radius of circular arc C shape arm is less than the radius that rotatablely moves, x-ray source 5, X-ray detector 6 and and then X ray central beam 7 extend through the swivel point 3 of C shape arm 4 all the time.Because the position of rolling guide 7 in C shape arm 4 can change, the rotation of non-isocentric C shape arm 4 can be converted into isocentric rotation.Can be clear that especially that in Fig. 7 motion is equivalent to along a circular trace rotation, the radius of described circular trace is equivalent to half width sum of radius and the X-ray detector 6 of C shape arm.

Fig. 8, what Fig. 9 and Figure 10 showed is the cross section of the C shape arm 14 of second embodiment, shown in cross section as shown in Fig. 5 to Fig. 7, be in identical position the cross section.C shape arm has best distribution of weight.

C shape arm 14 shown in Figure 8 aspect shape of cross section corresponding to the cross section of C shape arm 4 shown in Figure 5.As can be seen, C shape arm 14 has a depression 15 in Fig. 9, and described depression is to form between the interlude 16 of side groove 11 and C shape arm 14.Basically rectangular depression 15 is shorter than side groove 11.The quality of C shape arm 14 and the torque of appearance are minimized by depression 15.

At last, as can be seen, near the width of the depression 15 the outer end of C shape arm 14 is greater than the width in the cross-sectional view shown in Fig. 9 in Figure 10.The gross weight of C shape arm 14 is minimized by depression 15, and operation and driving also become simple thus.

Although by described preferred embodiment the present invention is had been described in detail; but therefore the present invention also is confined to the disclosed embodiments; only otherwise break away from protection scope of the present invention, this area professional person also can therefrom derive other flexible program.

Claims

1. x-ray instrument, has C shape arm rack-mount, that can center on the swivel point rotation, x-ray source and X-ray detector are installed on the described C shape arm, it is characterized in that, described C shape arm (4,14) can rotate along circular trace, the radius of described circular trace is equivalent to half width sum of radius and the described X-ray detector (6) of described C shape arm (4,14).

2. x-ray instrument according to claim 1 is characterized in that, described C shape arm (4,14) is designed to circular shape basically.

3. x-ray instrument according to claim 1 and 2 is characterized in that, described C shape arm (4,14) is installed on the support (2) by rolling guide.

4. x-ray instrument according to claim 3 is characterized in that, described rolling guide (8) comprises side groove (11), and the parts of described support (2) are placed in the described side groove.

5. x-ray instrument according to claim 4, it is characterized in that, described C shape arm (4,14) Nei side groove (11) is at described C shape arm (4,14) center is near described C shape arm (4,14) medial surface setting and the lateral surface setting of locating close described C shape arm (4,14) in the outer end of described C shape arm (4,14).

6. according to each described x-ray instrument in the aforementioned claim, it is characterized in that described C shape arm (4,14) is gravity balance.

7. according to each described x-ray instrument in the aforementioned claim, it is characterized in that described C shape arm (4,14) has depression (15) at least near its outer end.

8. according to each described x-ray instrument in the aforementioned claim, it is characterized in that described depression (15) and described side groove (11) adjacency.