Computed tomography system, detector ring and shading plate opening adjusting method thereof

Abstract

The invention relates to a computed tomography system, a detector ring and a shading plate opening adjusting method of the detector ring. A computed tomography system comprises an examination region (2) and a static gantry (4) comprising a detector ring (6) and an X-ray source ring (8), each surrounding the examination region (2) and substantially having a common axial direction, where the X-ray source ring (8) has a diameter greater than that of the detector ring (6), and the detector ring (6) has a diameter greater than that of the X-ray source ring (8). The detector ring (6) is arranged axially offset from the X-ray source ring (8) such that, when viewed in the radial direction, the X-ray source ring (8) is arranged further outward than the detector ring (6) around the examination region (2), and wherein the detector ring (6) is arranged axially offset from the X-ray source ring (8) such that, when viewed in the radial direction relative to the examination region (2), a beam exit opening (9) of the X-ray source ring (8) is at least partially uncovered by the detector ring (6).

Description

Technical Field

[0001] The invention relates to a computer tomography system, a detector ring for a computer tomography system and a method for adjusting a light shield opening of a computer tomography system. Background Art

[0002] Regardless of the grammatical part of speech of a particular term, individuals with both male and female gender identities are included in the term.

[0003] A common computed tomography (CT) system usually includes an X-ray tube and a detector opposite the X-ray tube. In order to image the patient, the X-ray tube and the detector rotate around the patient. The rotation allows a three-dimensional image of the patient to be captured. However, rotation also has disadvantages. Due to the rotation, the requirements for mechanics and data transmission are relatively high. These increased requirements lead to increased production and maintenance work and generally to increased costs, and also to impair image quality. For example, there is a risk of vibrations due to the rotation, which can lead to interfering frequencies in the measurement signal and thus to artifacts in the CT image. In general, rotation and any vibrations caused by rotation in particular can lead to faster wear of components. In addition, rotation requires that the components must be manufactured in a particularly robust manner, because deformations of the components can have a significant impact on the image quality. This inevitably leads to increased space requirements and rising hardware costs. Data transmission, for example by sliding contacts, is also made more difficult by rotation, so the capacity for data transmission is also limited. Summary of the invention

[0004] The object of the present invention is therefore to provide a possibility with which the above-mentioned disadvantages can be solved and at least partially improved.

[0005] This object is achieved by a computer tomography system, a detector ring and a method according to the invention.Further features and advantages are apparent from the following description and the accompanying drawings.

[0006] According to a first aspect of the present invention, a computer tomography system is provided. The computer tomography system comprises an examination region and a static gantry. The static gantry comprises a detector ring and an X-ray source ring, which respectively surround the examination region and substantially have a common axial direction. The X-ray source ring has a diameter greater than the detector ring, so that when viewed in the radial direction, the X-ray source ring is arranged around the examination region more externally than the detector ring. The detector ring is arranged axially offset relative to the X-ray source ring, so that when viewed radially relative to the examination region, a beam exit opening of the X-ray source ring is at least partially not covered by the detector ring.

[0007] The examination region is in particular a region in which a subject or an object is examined by means of computed tomography measurements performed by means of a computed tomography system, the examination being effected by capturing a computed tomography (CT) image of the subject or the object. The subject or object may be, for example, a human or an animal, or a body part such as an organ, or a body region such as the chest region or the head region, or another object such as luggage or a material whose properties are to be checked.

[0008] A rack including a detector ring and an X-ray source ring is arranged around the inspection area. The rack can be, in particular, a short annular channel. The axial direction of the annular channel can substantially correspond to the axial direction of the detector ring and the X-ray source ring. The axial direction can also be referred to as the z-direction. In this context, the term "substantially" should be understood as meaning that there may be certain deviations, for example due to the construction. However, the axial directions of the components mentioned in each case, in particular the detector ring and the X-ray source ring, preferably deviate from each other by no more than 10°. In this context, radial direction should be understood as perpendicular to the axial direction, and in particular extending radially outward from the center point of the corresponding ring. Therefore, the term radial direction should be understood as the presence of multiple directions corresponding to one radial direction, i.e. according to all possible radial extension directions. The radial direction can also be referred to as the x-direction, the y-direction and / or the x,y-direction.

[0009] The gantry is static. This is to be understood in particular in that, unlike other conventional gantries, the gantry does not rotate during the CT measurement. This is achieved by providing a detector ring and an X-ray source ring. Thus, a complete image can be generated even without rotating the detector and the X-ray source. In particular, the detector ring can be a 360° detector. In this sense, a 360° detector is a detector that picks up signals emitted from the examination area in all radial directions without rotating itself. In particular, the detector ring can be a static detector ring. In particular, the X-ray source ring can be a 360° X-ray emitter. In this sense, a 360° X-ray emitter is an X-ray emitter that sends X-rays from a full 360° area around the examination area to the examination area without rotating itself. In particular, the X-ray source ring can be a static X-ray source ring. The detector ring can, for example, have a plurality of detector elements distributed around the circumference of the detector ring. The X-ray source ring can, for example, have a plurality of X-ray sources distributed around the circumference of the X-ray source ring. The X-ray source can preferably be based on nanotube field emission technology. Compared with the X-ray sources based on thermally induced emission commonly used in CT systems of the prior art, X-ray sources based on field emission have the advantage that faster switching can be achieved because afterglow effects can be avoided as much as possible. However, other X-ray sources can also be used in general. The X-ray source ring can be configured to continuously activate a single X-ray source or a group of X-ray sources from its multiple X-ray sources during a CT scan of a subject or object in the examination area. Therefore, the advantages of quasi-"simulated" rotation or rotation can be achieved according to the CT systems commonly used in the prior art. Advantageously, this can avoid the actual rotation of the gantry, so that the disadvantages of the above-mentioned rotating parts can also be avoided to a large extent. Therefore, it is advantageous that complex and expensive interfaces, such as sliding contacts, are generally not required between the parts that move relative to each other. Rotational vibrations and the artifacts and wear in the measurement data caused by them can also be avoided. In addition, due to the lower stability of the components required, a more compact design can be achieved. For example, the module carrier and the detector mechanism of the detector or detector ring can be constructed in a significantly simpler, lighter and more economical way, because the detector does not have to withstand any rotational forces. For example, the system according to the present invention can also be configured for mobile use. Furthermore, since there is no need to consider inertia during mechanical rotation, images can advantageously be captured faster and with more flexibility in selecting successive capture angles.

[0010] The X-ray source ring has a larger diameter than the detector ring. Thus, viewed radially, the X-ray source ring is arranged around the inspection area more externally than the detector ring. In other words, the X-ray source ring is arranged more externally than the detector ring in the gantry. Advantageously, the X-ray source ring and the detector ring can therefore be constructed in a particularly space-saving manner. At the same time, the detector ring is arranged axially offset relative to the X-ray source ring, so that viewed radially, the beam exit opening of the X-ray source ring is at least partially not covered by the detector ring, that is, not completely not covered by the detector ring. In particular, the center of the beam exit opening can be made not covered by the detector ring. The beam exit opening should be understood in a broad sense. It generally refers to the position on the X-ray source ring where the X-rays are emitted outward from the X-ray source. In some cases, for example, for collimation, in particular according to some exemplary embodiments discussed herein, it may be advantageous to limit the beam exit opening in a targeted manner, in particular at the edge of the beam, by a portion of the detector ring or a portion on the detector ring. The detector ring can optionally be used as a collimator or a part of a collimator for the beam exit opening, thereby covering a portion of the beam exit opening. However, it is provided that at least a portion of the beam exit opening, preferably the center, is generally not blocked.

[0011] According to a preferred embodiment, the detector ring and the X-ray source ring partially overlap in the axial direction. This variant allows a particularly compact design of the gantry. In addition, the detector ring and the X-ray source ring can thus be assembled in a particularly close manner in the axial direction, so that an improved image quality can be achieved. In particular, the distance between the X-ray source focus of the X-ray source ring and the detector center can thus be reduced. As a result, for example, image errors caused by axial offsets can be less noticeable, or image correction can be facilitated accordingly.

[0012] According to one embodiment, the detector ring and the X-ray source ring are attached to the gantry from different sides, seen in the axial direction. For example, the detector ring can be mounted on the gantry from the positive axial direction (or from the +z direction), while the X-ray source ring can be mounted on the gantry from the negative axial direction (or from the -z direction). Due to the mounting from different sides, on the one hand, a particularly good spatial division can be achieved, and on the other hand, a particularly good accessibility of the two components (X-ray source ring and detector ring) can be achieved separately. This may be advantageous, for example, for maintenance purposes. For example, the detector ring can be disassembled or partially disassembled, without the X-ray source ring making disassembly more difficult. For example, the detector ring can thus be directly approached and removed, wherein for this purpose, for example, only a cover plate needs to be removed.

[0013] According to one embodiment, the gantry comprises an annular baffle having at least a first baffle portion and a second baffle portion, wherein the baffle is arranged in front of the beam exit opening of the X-ray source ring, wherein the first baffle portion is fastened to the detector ring or is a component of the detector ring. In particular, the baffle can be arranged in front of the beam exit opening so that the baffle collimates the X-rays of the X-ray source ring. By fastening the baffle portion to the detector ring, the detector ring can be arranged particularly close to the beam exit opening and a more compact design can be achieved. The second baffle portion can preferably be attached to the X-ray source ring or another part of the gantry, or can be a component of the X-ray source ring or another part of the gantry, respectively. The baffle can be a completely closed ring in the circumferential direction of the X-ray source ring or the detector ring. The first baffle portion and the second baffle portion can together form a channel that limits the propagation of X-ray radiation. The channel can extend in particular in the radial direction. Viewed in the circumferential direction, the channel can have a substantially constant cross section and / or a constant channel opening relative to the beam exit opening.

[0014] According to one embodiment, the detector ring is configured to be movable together with the first shutter part in the axial direction, so that the shutter opening of the shutter can be adjusted by moving the detector ring in the axial direction. This embodiment can represent an efficient way to realize different shutter openings of an X-ray source. In particular, a particularly space-saving adjustable shutter can thus be realized. Advantageously, the position of the detector ring and the beam distribution can thus be adjusted simultaneously. In this way, the propagation of the X-rays and the detector position can be synchronized in a simple and efficient manner.

[0015] According to one embodiment, the computed tomography system further comprises a patient bed, wherein the detector ring is attached to the gantry in the axial direction from the side of the patient bed. The patient bed can preferably be moved axially into and out of the gantry. By attaching the detector ring according to this embodiment, the detector ring can be accessed particularly easily, for example for maintenance purposes. In particular, the detector ring or elements of the detector ring can be removed from the gantry particularly easily.

[0016] According to one embodiment, the detector ring comprises functional units with detector elements, which can be removed individually from the rack. Advantageously, for example, when the functional units can be removed individually, individual detector elements can be maintained or replaced without removing the entire detector ring. For example, the overall orientation and adjustment of the detector ring can thus be maintained more easily, so that only a single functional unit needs to be reinstalled, while the overall orientation of the detector ring (and possible sunshade) can remain unchanged. This can simplify maintenance and make it more cost-effective. The detector ring may optionally include other functional units. A single functional unit may include or may be a module, a cable and / or a DSF (data flow front end). For example, a functional unit may be a module with detector elements arranged in a part circle.

[0017] According to one embodiment, the detector ring comprises at least one housing segment, wherein the housing segment is configured such that at least one functional unit can be at least partially inserted into the housing segment. At least one functional unit can be inserted into the housing segment. For example, it can be provided that at least one functional unit is inserted into the housing segment during operation of the detector ring. It can be provided that the functional unit is removed or removable from the housing to maintain the functional unit. The housing segment can preferably be annular or partially annular. The housing segment can be configured in particular such that a detector element of at least one functional unit can be inserted into the housing segment. Advantageously, the detector element can thus have a position defined by the position of the housing segment. In this way, the detector element can be replaced without having to subsequently readjust its position, or the position of the detector element can be adjusted in a simplified manner. It can be provided that a plurality of functional units with detector elements can be inserted or inserted into the housing segment. For example, a housing segment can be configured such that each two functional units can be at least partially inserted into the housing segment. The insertability of each two functional units can be particularly advantageous so that stable positioning and simple maintenance can be achieved. The first visor part as described herein can preferably be fastened to the housing segment. Therefore, it is possible to preferably prevent a position change of the first light shielding plate portion from occurring during removal or replacement of the functional unit.

[0018] According to one embodiment, the detector ring comprises a plurality of shell segments which, when assembled, define the annular shape of the detector ring. In this sense, the shell segments may be segments of the detector ring, in particular circular segments. The shell segments may be substantially equally sized circular segments of the detector ring. The detector ring may preferably comprise three or more shell segments. Particularly preferably, the detector ring may comprise three shell segments. The three shell segments may in particular be substantially three equally sized circular segments of the detector ring. For example, the shell segments may each be a 120° segment. It has been shown that the division into three shell segments is particularly advantageous for maintenance purposes and for flexible adjustment of the orientation of the detector ring. The first baffle portion described herein may comprise a plurality of first baffle portions, or may be assembled from a plurality of first baffle portions, which are each fastened to one shell segment.

[0019] According to one embodiment, at least one functional unit comprises a guide which is oriented such that the functional unit can be inserted into the housing segment in a precise manner.Alternatively or additionally, the guide may be provided as part of the housing segment.

[0020] The guide can be, for example, a guide rail or a guide rod. The housing segment can, for example, include an inner edge or a guide channel that is configured to interact with the guide of the functional unit. The guide can be used to position the functional unit particularly accurately in the housing segment. In addition, the guide can help prevent the functional unit, in particular the detector element, from being damaged, for example due to impacts during insertion.

[0021] According to one embodiment, the detector ring and / or the housing segment comprises a scattered beam collimator which is oriented to shield the detector elements of the detector ring from the scattered beams of the X-ray source ring, wherein the housing segment is configured such that when the at least one functional unit is inserted into the housing segment, the detector elements of the at least one functional unit are inserted in an exactly fitting manner relative to the scattered beam collimator. Advantageously, the positioning of the scattered beam collimator can thus be maintained while, for example, the functional unit is replaced.

[0022] According to one embodiment, the X-ray source ring comprises a plurality of X-ray source segments. All advantages and features regarding the maintenance of the detector ring can be similarly transferred to the X-ray source ring. Thus, individual segments of the X-ray source ring can be advantageously removed. For example, corresponding functional units and / or housing segments of the X-ray source ring can also be provided.

[0023] Another aspect of the invention is a detector ring for a computed tomography system, wherein the detector ring comprises at least one annular or partially annular housing segment and one or more functional units with detector elements, wherein the housing segment is configured such that at least one functional unit can be at least partially inserted into the housing segment. The detector ring can in particular be a detector ring as described herein with respect to a computed tomography system. All advantages and features of a computed tomography system can be transferred analogously to the detector ring and vice versa. The detector ring can comprise a plurality of housing segments as described herein, which define the annular shape of the detector ring when assembled.

[0024] According to one embodiment, at least one functional unit comprises a guide, which is oriented so that the functional unit can be inserted into the housing segment in a positionally accurate manner. Alternatively or additionally, the guide can be provided as part of the housing segment. The guide can be, for example, a guide rail or a guide rod. The housing segment can, for example, include an inner edge or a guide channel, which is configured to interact with the guide of the functional unit.

[0025] According to one embodiment, the detector ring comprises a first baffle part, which is fastened to the detector ring or is an integral part of the detector ring, wherein the first baffle part is configured to produce, together with the second baffle part, a baffle for an X-ray emission ring, which has a larger diameter than the detector ring. In particular, a baffle can be provided for an X-ray ring as described herein. The first baffle part can, for example, be fastened to a housing segment.

[0026] According to one embodiment, the detector ring and / or the housing segment include a scattered beam collimator, wherein the housing segment is configured such that when at least one functional unit is inserted into the housing segment, the detector element of the at least one functional unit is inserted in a precisely matched manner relative to the scattered beam collimator.

[0027] Another aspect of the invention is a method for adjusting a baffle opening of a computed tomography system having a static gantry, wherein the gantry comprises a detector ring, an X-ray source ring having a beam exit opening, and an annular baffle having at least a first baffle portion and a second baffle portion, wherein the baffle is arranged in front of the beam exit opening of the X-ray source ring, wherein the first baffle portion is fastened to the detector ring or is an integral part of the detector ring. The computed tomography system can in particular be a computed tomography system as described herein. The method comprises the following steps:

[0028] - axially moving the detector ring and thus the first shutter part, thereby changing the distance between the first shutter part and the second shutter part and adjusting the shutter opening of the shutter.

[0029] All advantages and features of the computed tomography system and the detector ring can be transferred analogously to the method and vice versa.

[0030] Unless explicitly stated otherwise, all embodiments described herein are combinable with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Embodiments will be described below with reference to the accompanying drawings.

[0032] Figure 1 shows a side schematic cross-sectional view of a computer tomography system according to an embodiment of the present invention,

[0033] Figure 2 A perspective view showing a gantry of a computed tomography system according to an embodiment of the present invention is shown,

[0034] Figure 3 shows a housing segment and two functional units of a detector ring according to an exemplary embodiment of the invention, and

[0035] Figure 4A schematic diagram of a method for adjusting a visor opening of a computed tomography system with a static gantry according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0036] Figure 1 A side schematic cross-sectional view of a computed tomography system according to an embodiment of the present invention is shown. The computed tomography system comprises a static gantry 4, which is arranged as a short annular channel around an examination region 2. The gantry 4 comprises a detector ring 6 and an X-ray source ring 8, of which an upper part and a lower part are shown, respectively, and they surround the examination region 2, respectively. The detector ring 6 and the X-ray source ring 8 have a common axial direction, which corresponds to the z-direction shown. With reference to the figure, the detector ring 6 is attached to the gantry 4 from the right side, while the X-ray source ring 8 is attached to the gantry 4 from the left side. This means that the detector ring 6 and the X-ray source ring 8 are attached to the gantry 4 from different sides. In this case, the detector ring 6 is attached to the gantry 4 from the side where the patient bed 3 is also provided. The detector ring 6 and the X-ray source ring 8 partially overlap in the axial direction, i.e., a portion of the X-ray source ring 8 is in the same z position as a portion of the detector ring 6. The X-ray source ring 8 has a larger diameter than the detector ring 6, so that when viewed in the radial direction (i.e., in the x, y direction), the X-ray source ring 8 is arranged around the examination region 2 more externally than the detector ring 6. In addition, the detector ring 6 is arranged offset relative to the X-ray source ring 8 in the axial direction, so that when viewed in the radial direction relative to the examination region 2, the beam exit opening 9 of the X-ray source ring 8 is not completely covered by the detector ring 6. The first baffle part 11 is a part of an annular baffle plate 10 arranged in front of the beam exit opening 9, and the first baffle plate part 11 is fastened to the detector ring 6. The second baffle plate part 12 of the baffle plate 10 is fastened to the X-ray source ring 8 itself. In this embodiment, and preferably in other embodiments, the baffle plate part 11 and the baffle plate part 12 are in particular independent components, but they interact functionally. The detector ring 6 is configured to be movable in the axial direction (in other words, here in the z direction) together with the first baffle plate part 11, so that the baffle plate opening of the baffle plate 10 can be adjusted by moving the detector ring 6 in the axial direction.

[0037] Figure 2A perspective view of a gantry 4 of a computed tomography system according to an embodiment of the invention is shown. In this case, the gantry 4 is shown without an outer cladding. A detector ring 6 is attached to the gantry 4. An X-ray source ring 8 (not shown here) is arranged on the opposite side of the gantry 4 (from this perspective, the rear side). The detector ring 6 comprises three partially annular shell segments 61 and two functional units 62 for each shell segment 61, which have detector elements 63 inserted into the shell segments 61. The shell segments 61 together form the annular shape of the detector ring 6. The functional units 62 can be removed from the gantry 4 separately. The X-ray source ring 8 (not visible here) can also optionally include a plurality of X-ray source segments, similar to the functional units 62 or the shell segments 61 of the detector ring 6.

[0038] Figure 3 A housing segment 61 and two functional units 62 of a detector ring 6 according to an embodiment of the invention are shown. The detector elements 63 of the two functional units 62 can be inserted into the housing part 61. The functional units 62 each comprise a guide 64 in the form of a guide rod, which is oriented so that the functional unit 62 can be inserted into the housing part 61 in a positionally accurate manner, which is achieved in that the guide 64 is guided along the inner edge of the housing part 61, thereby causing an orientation of the respective functional unit 62. The housing part 61 also comprises a scattered beam collimator 65, which is oriented so as to shield the detector elements 63 from the scattered beams of the X-ray source ring 8. The guide 64 can also ensure that when the functional unit 62 is inserted into the housing part 61, the detector element 63 is inserted in a precisely fitting manner relative to the scattered beam collimator 65.

[0039] Figure 4 A schematic diagram of a method for adjusting a shutter opening of a computed tomography system having a static gantry 4 according to one embodiment of the invention is shown. The gantry 4 comprises a detector ring 6 and an X-ray source ring 8, the X-ray source ring 8 having a beam exit opening 9 and an annular shutter 10 having a first shutter portion 11 and a second shutter portion 12, the annular shutter 10 being arranged in front of the beam exit opening 9 of the X-ray source ring 8. The first shutter portion 11 is fastened to the detector ring 6. As shown, in the method, the detector ring 6 and therefore the first shutter portion 11 are moved in the axial direction (z direction), thereby changing the distance between the first shutter portion 11 and the second shutter portion 12 (in this case enlarging), and adjusting the shutter opening of the shutter 10.

Claims

1. A computer tomography system, comprising: Check area (2), and a static gantry (4), the gantry comprising a detector ring (6) and an X-ray source ring (8), the detector ring and the X-ray source ring respectively surrounding the examination region (2) and having substantially a common axial direction, wherein the X-ray source ring (8) has a larger diameter than the detector ring (6), so that when viewed in the radial direction, the X-ray source ring (8) is arranged further outwardly around the examination region (2) than the detector ring (6), The detector ring (6) is arranged axially offset relative to the X-ray source ring (8) so that when viewed radially relative to the examination region (2), a beam exit opening (9) of the X-ray source ring (8) is at least partially not covered by the detector ring (6).

2. The computer tomography system according to claim 1, Viewed in the axial direction, the detector ring (6) and the X-ray source ring (8) are attached to the gantry (4) from different sides.

3. The computer tomography system according to any one of the preceding claims, The frame (4) comprises an annular shading plate (10) having at least a first shading plate portion (11) and a second shading plate portion (12), wherein the light shield is arranged in front of the beam exit opening (9) of the X-ray source ring (8), The first light shield part (11) is fastened to the detector ring (6), or the first light shield part (11) is a component of the detector ring (6).

4. The computer tomography system according to claim 3, The detector ring (6) is configured to be movable in the axial direction together with the first light shielding plate part (11), so that the light shielding plate opening of the light shielding plate (10) can be adjusted by moving the detector ring (6) in the axial direction.

5. The computer tomography system according to claim 3 or 4, The second shading plate part (12) is attached to the X-ray source ring (8) or to another part of the gantry (4), or the second shading plate part (12) is a component of the X-ray source ring (8) or a component of another part of the gantry (4), respectively.

6. The computer tomography system according to any one of the preceding claims, The detector ring (6) and the X-ray source ring (8) partially overlap in the axial direction.

7. The computer tomography system according to any one of the preceding claims, The computer tomography system further comprises a patient bed (3), which can be moved into and out of the frame (4), in particular in the axial direction. The detector ring (6) is axially attached to the gantry (4) from the side of the patient bed (3).

8. The computer tomography system according to any one of the preceding claims, The detector ring (6) comprises a functional unit (62) with a detector element (63), which can be removed individually from the frame (4).

9. The computer tomography system according to claim 7 or 8, The detector ring (6) comprises at least one annular or partially annular housing segment (61). The housing section (61) is configured such that at least one functional unit (62) can be at least partially inserted into the housing section (61).

10. The computer tomography system according to claim 9, The at least one functional unit (62) comprises a guide (64) which is oriented such that the functional unit (62) can be inserted into the housing section (61) in a precisely positioned manner.

11. The computer tomography system according to claim 9 or 10, wherein the housing section (61) comprises a scattered beam collimator (65) which is oriented to shield the detector elements (63) of the detector ring (6) from the scattered beams of the X-ray source ring (8), The housing section (61) is configured such that when the at least one functional unit (62) is inserted into the housing section (61), the detector element (63) of the at least one functional unit (62) is inserted in a precisely matched manner relative to the scattered light beam collimator.

12. The computer tomography system according to any one of claims 9 to 11, The detector ring (6) comprises a plurality of shell segments (61), which define the annular shape of the detector ring (6) when assembled.

13. A detector ring (6) for a computed tomography system, in particular a detector ring (6) according to any one of the preceding claims, The detector ring (6) comprises at least one annular or partially annular housing segment (61) and one or more functional units (62) having detector elements (63). The housing section (61) is configured such that at least one functional unit (62) can be at least partially inserted into the housing section (61).

14. The detector ring (6) according to claim 13, The detector ring (6) comprises a first light shielding plate part (11), the first light shielding plate part is fastened to the detector ring (6), or the first light shielding plate part (11) is a component of the detector ring (6), The first baffle part (10) is configured to produce, together with the second baffle part (12), a baffle (10) for an X-ray beam ring having a larger diameter than the detector ring (6).

15. A method for adjusting a shutter opening of a computed tomography system having a static gantry (4), in particular a computed tomography system according to any one of the preceding claims, The frame (4) comprises a detector ring (6), an X-ray source ring (8) and an annular light shielding plate (10), wherein the X-ray source ring has a beam exit opening (9), and the light shielding plate (10) has at least a first light shielding plate portion (11) and a second light shielding plate portion (12). wherein the light shield (10) is arranged in front of the beam exit opening (9) of the X-ray source ring (8), wherein the first light shielding plate part is fastened to the detector ring (6), or the first light shielding plate part (11) is a component of the detector ring (6), The method comprises the following steps: The detector ring (6) is moved in the axial direction and thus the first baffle part (11) is moved, thereby changing the distance between the first baffle part (11) and the second baffle part (12) and adjusting the baffle opening of the baffle (10).

Images