Floating bracket patient examination table with multi-modal imaging function

Abstract

A patient table (46) for a computed tomography (CT) imaging system (10) is provided. The patient table (46) includes a base (52). The patient table (46) also includes a floating carriage (50) configured to support the subject (22) to be imaged and to move bidirectionally relative to the base (52). The patient table (46) also includes a stationary structure (78) coupled to the base (52). The patient table (46) also includes a plurality of rollers (84) mounted to the stationary structure (78). The plurality of rollers (84) are configured to both guide and support the floating carriage (50). The floating bracket (50) is configured to guide itself when extending beyond the stationary structure (78).

Description

Background Art

[0001] The subject matter disclosed herein relates to imaging systems, and more particularly to a floating cradle patient table with multi-modality imaging capabilities.

[0002] Non-invasive imaging techniques allow images of a patient's internal structures or features to be obtained without performing an invasive procedure on the patient. Specifically, such non-invasive imaging techniques rely on various physical principles (such as differential transmission of X-rays through a target volume or reflection of sound waves) to acquire data and construct an image or otherwise represent the observed internal features of a patient.

[0003] For example, in computed tomography (CT) and other X-ray based imaging techniques, X-ray radiation passes across a subject of interest (such as a human patient) and a portion of the radiation impacts a detector that collects image data. In digital X-ray systems, photodetectors generate signals representing the amount or intensity of radiation that strikes discrete pixel regions of the detector surface. The signals can then be processed to generate an image that can be displayed for viewing. In a CT imaging system, a detector array comprising a series of detector elements generates similar signals through various locations as the gantry moves around the patient.

[0004] The patient is moved into and out of the orifice of the rack of the CT scanner through the patient table. A typical CT patient table usually includes a long fixed beam structure (e.g., an extruded beam structure) on which a linear motion guide is installed to guide the patient support bracket during the movement of the patient support bracket into and out of the rack. This structure of the patient table constrains the size layout of the room for installing the CT system. In addition, due to the long beam structure of the CT patient table, it is very challenging for the field engineer performing maintenance to manipulate the rack cover of the rack. In short, the typical CT table structure is bulky, which makes packaging, transportation, assembly and installation complicated. In addition, the beam structure of the CT patient table is long, and it is impossible to achieve or support the coordinated use of some radiation, treatment or procedures (e.g., interventional radiography, image-guided therapy, fluoroscopy, angiography, etc.) with other imaging equipment (e.g., fixed radiation, fluoroscopy, fixed C-arm, mobile C-arm, etc.). Specifically, the patient tables of these other imaging devices cannot be used for CT-based radiation, treatment or procedures because the scanning range of the CT patient table carriage used to perform the CT scan moves. For the CT scanning gantry, linear motion rails need to be installed on the floor, and a larger scan is required to achieve this. In addition, in order to achieve this, the CT patient table structure will become so complex and large (and expensive), and the length of the table will increase significantly (e.g., by 80%), so that this will cause the table carriage to deflect more, making it difficult to ensure image quality. Summary of the invention

[0005] Certain embodiments commensurate with the scope of the originally claimed subject matter are summarized below. These embodiments are not intended to limit the scope of the claimed subject matter, but rather, these embodiments are intended only to provide a brief overview of possible forms of the subject matter. In fact, the subject matter may include a variety of forms that may be similar to or different from the embodiments described below.

[0006] In one embodiment, a patient table for a computed tomography (CT) imaging system is provided. The patient table includes a base. The patient table also includes a floating carriage configured to support a subject to be imaged and to move bidirectionally relative to the base. The patient table also includes a fixed structure coupled to the base. The patient table even includes a plurality of rollers mounted to the fixed structure. The plurality of rollers are configured to both guide and support the floating carriage. The floating carriage is configured to guide itself when extending beyond the fixed structure.

[0007] In another embodiment, a computed tomography (CT) imaging system is provided. The CT imaging system includes a frame coupled to an imaging component, which is configured to acquire imaging data of a subject. The CT imaging system also includes a patient table. The patient table includes a base. The patient table also includes a floating bracket, which is configured to support a subject to be imaged and move bidirectionally relative to the base. The patient table also includes a fixed structure coupled to the base. The patient table also includes a plurality of rollers mounted to the fixed structure. The plurality of rollers are configured to both guide and support the floating bracket. The floating bracket is configured to guide itself when extending beyond the fixed structure.

[0008] In another embodiment, a patient table for an imaging system is provided. The patient table includes a base. The patient table also includes a floating bracket, which is configured to support a subject to be imaged and to move bidirectionally relative to the base. The patient table also includes a fixed structure coupled to the base. The fixed structure includes a pair of beams that flank a portion of the floating bracket. The pair of beams extend in a direction parallel to the longitudinal axis of the floating bracket. A first length of the floating bracket along the longitudinal axis is greater than a corresponding length of each of the pair of beams in that direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] These and other features, aspects, and advantages of the subject matter disclosed herein will be better understood when the following detailed description is read with reference to the accompanying drawings, in which like characters refer to like parts throughout the several views, and in which:

[0010] Figure 1 is a combined pictorial view and block diagram of a computed tomography (CT) imaging system as discussed herein;

[0011] Figure 2 According to various aspects of the present disclosure Figure 1 A perspective view of a patient table (e.g., having a base configured to move vertically) of a CT imaging system of FIG.

[0012] Figure 3 According to various aspects of the present disclosure Figure 1 A perspective view of a patient table (e.g., having a fixed base) of a CT imaging system;

[0013] Figure 4 According to various aspects of the present disclosure Figure 3 A side view of a patient table of a CT imaging system;

[0014] Figure 5 According to various aspects of the present disclosure Figure 3 Top view of the patient table of the CT imaging system;

[0015] Figure 6 is taken along line 6-6 according to aspects of the present disclosure Figure 5 A cross-sectional view of a patient table (e.g., with support rollers on the side wings);

[0016] Figure 7 is taken along line 7-7 according to aspects of the present disclosure Figure 4 A cross-sectional view of a patient table (eg, with steps on the side of the floating tray);

[0017] Figure 8 is taken along line 8-8 according to aspects of the present disclosure Figure 7 A cross-sectional view of a patient table;

[0018] Fig. 9 is taken along line 7-7 according to aspects of the present disclosure Figure 4 A cross-sectional view of a patient table (eg, a floating cradle having tapered sides);

[0019] Fig.10 is taken along line 7-7 according to aspects of the present disclosure Figure 4 Cross-sectional view of a patient table (eg, no steps on the sides of a floating tray);

[0020] Fig.11 is taken along line 7-7 according to aspects of the present disclosure Figure 4 A cross-sectional view of a patient table (eg, a floating cradle having rounded sides);

[0021] Fig.12 According to various aspects of the present disclosure Figure 3A schematic diagram of a patient table with a patient disposed on a floating support (eg, the floating support is external to the gantry);

[0022] Fig.13 According to various aspects of the present disclosure Figure 3 A schematic diagram of a patient table with a patient disposed on a floating support (eg, the floating support is inside a gantry);

[0023] Fig.14 is taken along line 6-6 according to aspects of the present disclosure Figure 5 A cross-sectional view of a patient table (e.g., with drive rollers on the side wings);

[0024] Fig.15 is taken along line 7-7 according to aspects of the present disclosure Figure 4 A cross-sectional view of a patient table (e.g., with drive rollers on the side of a floating carriage);

[0025] Fig.16 According to various aspects of the present disclosure Figure 4 A top view of a portion of a patient table (e.g., having a single friction drive) of a CT imaging system;

[0026] Fig.17 According to various aspects of the present disclosure Figure 4 A top view of a portion of a patient table of a CT imaging system (e.g., having multiple synchronized friction drives);

[0027] Fig.18 According to various aspects of the present disclosure Figure 3 A side view of a patient table (e.g., with an adjustable cable retractor) of a CT imaging system;

[0028] Fig.19 According to various aspects of the present disclosure Figure 3 A side view of a patient table (e.g., with an anti-collision sensor) of a CT imaging system;

[0029] Fig. 20 An image showing a comparison of stress analysis results for a typical bracket and a floating bracket;

[0030] Fig.21 In a scanning room sized to fit a typical patient table and by Figure 3 Smaller scanning room with a patient table Figure 3 Schematic diagram of the patient examination table and CT scanner;

[0031] Fig. 22 is a scanning room according to aspects of the present disclosure (e.g., during normal operation and during maintenance) Figure 3 Schematic diagram of the patient examination table and CT scanner;

[0032] Fig.23 According to various aspects of the present disclosure Figure 2 Side view of a patient examination table;

[0033] Fig.24 According to various aspects of the present disclosure, there is a CT scanner and a Figure 2 Schematic diagram of a scanning room (e.g., during a CT scanning room procedure) of a mobile C-arm imaging system with a patient examination table;

[0034] Fig.25 According to various aspects of the present disclosure, there is a CT scanner and a Figure 2 a schematic diagram of the scanning room for a mobile C-arm imaging system with a patient table (during a stationary radiographic scanning procedure); and

[0035] Fig.26 According to various aspects of the present disclosure, there is a CT scanner and a Figure 2 Schematic diagram of the scanning room with a ceiling-mounted C-arm imaging system on the patient examination table. DETAILED DESCRIPTION

[0036] One or more specific embodiments will be described below. In order to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be understood that in the development of any such actual implementation, as in any engineering or design project, many implementation-specific decisions must be made to achieve the developer's specific goals, such as complying with system-related and business-related constraints that may vary from implementation to implementation. In addition, it should be understood that such development efforts may be complex and time-consuming, but are still routine tasks for design, fabrication, and manufacturing for ordinary technicians who benefit from this disclosure.

[0037] When introducing elements of various embodiments of the present subject matter, the articles "a," "an," "the," and "said" are intended to indicate that there are one or more elements. The terms "comprising," "including," and "having" are intended to be inclusive, and mean that there may be additional elements in addition to the listed elements. Furthermore, any numerical examples in the following discussion are intended to be non-limiting, and thus the additional numerical values, ranges, and percentages are within the scope of the disclosed embodiments.

[0038] Although various aspects of the following discussion are provided in the context of medical imaging, it should be understood that the technology disclosed in the present invention is not limited to such medical contexts. In fact, the examples and explanations are provided in such medical contexts only to facilitate explanation by providing examples of realistic specific implementations and applications. However, the technology disclosed in the present invention can also be used in other contexts, such as non-destructive inspection of manufactured parts or goods (i.e., quality control or quality review application scenarios) and / or image reconstruction of non-invasive inspection of packages, boxes, suitcases, etc. (i.e., security inspection or screening application scenarios). In general, the technology disclosed in the present invention can be used in any imaging or screening context or image processing or photography field, in which a group or class of collected data undergoes a reconstruction process to generate an image or volume.

[0039] The present disclosure provides various embodiments of a patient table of a medical imaging system (e.g., a computed tomography (CT) imaging system) including a floating bracket. The patient table includes a base. In certain embodiments, the base is a fixed base. In certain embodiments, the base is configured to move in both directions in a vertical direction (e.g., relative to a floor). The patient table also includes a floating bracket, which is configured to support a subject to be imaged and to move in both directions relative to the base (which enables a practical scanning range on both sides of the patient table). The patient table also includes a fixed structure coupled to the base. The patient table even includes a plurality of rollers (e.g., guide rollers) mounted to the fixed structure. The plurality of rollers are configured to both guide and support the floating bracket. The floating bracket is configured to guide itself when extending beyond the fixed structure.

[0040] In certain embodiments, the fixed structure includes a pair of beams (e.g., extruded beams) flanking a portion of the floating carriage, wherein the pair of beams extend in a direction parallel to the longitudinal axis of the floating carriage. The first length of the floating carriage along the longitudinal axis is greater than the corresponding length of each beam in the pair of beams in that direction. The fixed structure includes a first side and a second side opposite to the first side, wherein the first side is configured to face the rack of the CT imaging system. The floating carriage is configured to enable the subject on the floating carriage to be scanned on at least one of the first side and the second side using an imaging system (e.g., C-arm imaging) that is separate from and different from the CT imaging system. This enables the use of multiple imaging devices in a single room.

[0041] In certain embodiments, the plurality of rollers include a first group of rollers disposed above the floating carriage and a second group of rollers disposed below the floating carriage. In certain embodiments, the first group of rollers is configured to hold the floating carriage on a fixed structure. In certain embodiments, at least one roller in the second group of rollers is configured to support the floating carriage, and at least one roller in the second group of rollers is configured to drive the floating carriage to move in both directions relative to the base. In certain embodiments, the second group of rollers includes a friction drive roller configured to drive the floating carriage to move in both directions relative to the base, and a pair of rollers on the flanks of the friction drive roller and configured to support the floating carriage. In certain embodiments, the second group of rollers includes a roller configured to support the floating carriage, and a pair of friction drive rollers on the flanks of the roller and configured to drive the floating carriage to move in both directions relative to the base.

[0042] In certain embodiments, the plurality of rollers comprises a third group of rollers disposed on a first side and a second side of the floating carriage, wherein both the first side and the second side extend between a top surface and a bottom surface of the floating carriage. In certain embodiments, at least one roller in the third group of rollers is configured to guide the floating carriage to move in both directions relative to the base. In certain embodiments, at least one roller in the third group of rollers is configured to hold the floating carriage on a fixed structure. In certain embodiments, at least one roller in the third group of rollers is configured to drive the floating carriage to move in both directions relative to the base. In certain embodiments, the third group of rollers comprises a first roller disposed on a first side of the floating carriage and a second roller disposed on a second side of the floating carriage, and both the first roller and the second roller are configured to drive the floating carriage to move in both directions relative to the base.

[0043] In some embodiments, the patient examination table includes a cable retractor (e.g., an adjustable cable retractor). The cable retractor includes a first end structure coupled to a fixed structure, a second end structure coupled to a longitudinal end of a floating carriage, and a rope extending between the first end structure and the second end structure. The cable retractor is configured to keep the longitudinal end of the floating carriage from extending beyond a fixed distance from the fixed structure. The cable retractor is also configured to be adjusted to change or set a fixed distance. In some embodiments, the patient examination table includes a sensor (e.g., an anti-collision sensor) coupled to the longitudinal end of the floating carriage. The sensor is configured to sense an object and send a signal to stop the floating carriage from moving to avoid collision with the object.

[0044] The disclosed embodiments provide a patient table with a floating bracket that reduces the space size requirements for a CT scanner. The disclosed embodiments also enable easier transportation, handling, and installation. For example, the symmetrical construction of the fixed structure and the floating bracket enables the table to be mounted in a mirror image relative to the frame (i.e., either longitudinal end can be mounted adjacent to the frame). The disclosed embodiments also include easier serviceability due to easy manipulation of the frame cover, thereby reducing downtime of the CT imaging system. The disclosed embodiments provide an enhanced platform for a patient table for use in conjunction with multiple imaging modalities (e.g., enhanced by having a practical scanning range on both sides of the patient table). The disclosed embodiments also include reduced costs due to the lack of a long beam structure. The disclosed embodiments even provide a low-cost solution for a multi-modal intervention / imaging environment in a common scanning room. The disclosed embodiments also provide a faster scanning process in the multi-modal intervention / imaging environment.

[0045] Taking into account the foregoing and referring to Figure 1 , a computed tomography (CT) imaging system 10 is shown by way of example. The CT imaging system 10 includes a gantry 12. The gantry 12 has an X-ray source 14 that projects a beam of X-rays 16 toward a detector assembly 15 on the opposite side of the gantry 12. The X-ray source 14 projects the X-ray 16 beam through a pre-patient collimator assembly 13, which determines the size and shape of the X-ray 16 beam. The detector assembly 15 includes a collimator assembly 18 (post-patient collimator assembly), a plurality of detector modules 20 (e.g., detector elements or sensors), and a data acquisition system (DAS) 32. The plurality of detector modules 20 detect the projected X-rays that pass through a subject or object 22 being imaged, and the DAS 32 converts the data into digital signals for subsequent processing. Each detector module 20 in a conventional system generates an analog electrical signal that represents the intensity of the incident X-ray beam and, therefore, the intensity of the beam that is attenuated when the incident X-ray beam passes through the subject or object 22. During a scan to acquire x-ray projection data, the gantry 12 and components mounted thereon are rotated about a center of rotation 25 (eg, isocenter) to collect attenuation data from multiple viewing angles relative to the imaging volume.

[0046] The rotation of the gantry 12 and the operation of the X-ray source 14 are controlled by a control system 26 of the CT imaging system 10. The control system 26 includes an X-ray controller 28, which provides power and timing signals to the X-ray source 14; a collimator controller 29, which controls the aperture length and width of the pre-patient collimator 13 (and therefore, the size and shape of the beam of X-rays 16); and a gantry motor controller 30, which controls the rotation speed and position of the gantry 12. An image reconstructor 34 receives sampled and digitized X-ray data from the DAS 32 and performs high-speed image reconstruction. The reconstructed image is applied as input to a computer 36, which stores the image in a storage device 38. The computer 36 also receives commands and scanning parameters from an operator via a console 40. An associated display 42 allows the operator to observe the reconstructed image and other data from the computer 36. The computer 36 uses the commands and parameters provided by the operator to provide control signals and information to the DAS 32, the x-ray controller 28, the collimator controller 29, and the gantry motor controller 30. In addition, the computer 36 operates a table motor controller 44, which controls a motorized table 46 (e.g., a patient table) to position the subject 22 and the gantry 12. Specifically, the table 46 moves portions of the subject 22 through a gantry opening or aperture 48.

[0047] Although the patient table 46 in the present disclosure is discussed in the context of a CT imaging system, the patient table 46 may be utilized in conjunction with other types of medical imaging systems (e.g., magnetic resonance imaging systems, nuclear medicine imaging systems, etc.). Various aspects of the patient table 46 in the following figures are discussed using a coordinate system having a y-direction (or y-axis), an x-direction (or x-axis), and a z-direction (or z-axis). The coordinate system may be discussed relative to a longitudinal axis 49 of the patient table 46 (and floating carriage 50). Figure 2 and Figure 3 yes Figure 1 A perspective view of a patient table 46 of the CT imaging system 10 in FIG. Figure 4 and Figure 5 They are Figure 34 is a side view and a top view of a patient table 46 of a CT imaging system in a scanning room. The patient table 46 includes a base 52. In some embodiments, the base 52 is fixed to a single position on the floor in the scanning room. In other words, the base 52 does not move in the y direction, the x direction, and the z direction. In some embodiments, the base 52 is configured to move bidirectionally (e.g., extend in the x direction or axial direction) along the path on the floor in the scanning room (e.g., via a linear motion guide rail). As shown, the base 52 is configured to move bidirectionally (as indicated by arrows 54) in the y direction or vertical direction (e.g., extend and contract). As shown, the base 52 includes a plurality of parts 56, which extend and contract relative to each other in the y direction in a telescopic manner, wherein the largest part 56 is at the top and the smallest part 56 is at the bottom. In some embodiments, the arrangement of the plurality of parts 56 can be reversed, and the largest part 56 can be located at the bottom, while the smallest part is at the top. The movement of the base 52 in the y direction enables the height of the floating bracket 50 relative to the floor to be adjusted.

[0048] In some embodiments, the base 52 may be Figure 3 As shown, the floating bracket 50 is fixed in the y direction. Therefore, the height of the floating bracket 50 relative to the floor cannot be adjusted via the base 52. Figure 3 As shown, the base 52 may include a plurality of rods 60 extending in the y-direction, the x-direction, and the z-direction to form the base 52. The structure of the base 52 may be different from Figure 2 and Figure 3 The structure shown.

[0049] The patient table 46 also includes a floating carriage 50. The floating carriage 50 is configured to support a subject (e.g., a patient) to be imaged. The floating carriage 50 is configured to move bi-directionally relative to the base 52 in the x-direction and along the longitudinal axis 49 (as indicated by arrow 62). The floating carriage 50 includes a first side 64 and a second side 66, both of which extend in the x-direction between a first end 68 (a first longitudinal end) and a second end 70 (a second longitudinal length). The first end 68 is configured to face the gantry (e.g., Figure 1 The first side 64 and the second side 66 have a length 72 (eg, a longitudinal length) in the x-direction and a width 74 in the z-direction. Figure 2 As shown, respective edges of the first side 64 and the second side 66 integrally include a step 76 .

[0050] The patient table 46 also includes a fixed structure 78 coupled to the top (eg, top portion 58) of the base 52. The fixed structure 78 is not rotatable in any direction relative to the top (or Figure 3The fixed structure 78 includes a pair of beams or beam structures 80 (e.g., extruded beams) coupled to the base 52. The pair of beams 80 extends in an x-direction parallel to the longitudinal axis 49. Each beam 80 in the pair of beams has a corresponding length 82 (e.g., a longitudinal length). The length 72 of the floating bracket 50 is greater than the corresponding length 82 of each beam 80. In certain embodiments, the corresponding length 82 of each beam 80 may be in the range of about 20% to 75% of the length 72 of the floating bracket 50. Portions of the floating bracket 50 that are free of the base 52 and the fixed structure 78 are considered to be floating (e.g., not affected by rails or any support structure). These portions of the floating bracket 50 also guide themselves when extending beyond the fixed structure 78.

[0051] The patient examination table 46 also includes a plurality of rollers 84 mounted to the fixed structure 78. The plurality of rollers 84 are configured to both guide and support the floating carriage 50, as described in more detail below. In certain embodiments, the plurality of rollers 84 include a first group of rollers disposed above the floating carriage 50 and a second group of rollers disposed below the floating carriage 50. In certain embodiments, the first group of rollers is configured to hold the floating carriage 50 on the fixed structure. In certain embodiments, at least one roller in the second group of rollers is configured to support the floating carriage 50, and at least one roller in the second group of rollers is configured to drive the floating carriage 50 to move in both directions relative to the base 52 (as indicated by arrow 62). In certain embodiments, the second group of rollers includes a friction drive roller configured to drive the floating carriage 50 to move in both directions relative to the base 52, and a pair of rollers on the flanks of the friction drive roller and configured to support the floating carriage 50. In certain embodiments, the second set of rollers includes a roller configured to support the floating carriage 50 and a pair of friction drive rollers flanking the roller and configured to drive bi-directional movement of the floating carriage 50 relative to the base 52 .

[0052] In some embodiments, the plurality of rollers 84 include a third group of rollers disposed on the first side 64 and the second side 66 of the floating carriage 50, wherein both the first side 64 and the second side 66 extend between the top surface and the bottom surface of the floating carriage 50. In some embodiments, at least one roller in the third group of rollers is configured to guide the floating carriage 50 to move in both directions relative to the base 52. In some embodiments, at least one roller in the third group of rollers is configured to hold the floating carriage 50 on the fixed structure 78. In some embodiments, at least one roller in the third group of rollers is configured to drive the floating carriage 50 to move in both directions relative to the base 52. In some embodiments, the third group of rollers includes a first roller disposed on the first side 64 of the floating carriage 50 and a second roller disposed on the second side 66 of the floating carriage 50, and both the first roller and the second roller are configured to drive the floating carriage 50 to move in both directions relative to the base 52.

[0053] Figure 6 It was taken along line 6-6 Figure 5 46 (e.g., with support rollers on the side wings). As described above, the patient examination table 46 includes a plurality of rollers 84. The size, location, and number of rollers 84 may vary. Figure 6 The rollers shown are optimized to minimize local stress on the floating carriage 50. In certain embodiments, each roller 84 may be a highly durable rubber coated with a polymeric sheath to prevent wear on the floating carriage 50.

[0054] As shown, the plurality of rollers 84 include a first set 86 of rollers 84 disposed above the floating carriage 50 and a second set 88 of rollers 84 disposed below the floating carriage 50. The first set 86 of rollers 84 contact the top surface 89 of the floating carriage 50. The first set 86 of rollers 84 are configured to hold the floating carriage 50 on the fixed structure 78. In other words, the first set 86 of rollers 84 are load bearing members. As shown, the first set 86 of rollers 84 includes three rollers 84 on each side of the floating carriage 50 (see FIG. Figures 2 to 5 ). However, the number of rollers 84 in the first set 86 of rollers 84 may be different from this.

[0055] The second group 88 of rollers 84 contacts the bottom surface 91 of the floating carriage 50. At least one roller 84 in the second group 88 of rollers 84 is configured to support the floating carriage 50. In addition, at least one roller 84 in the second group 88 of rollers 84 is configured to drive the floating carriage 50 to move in both directions relative to the base. The second group 88 of rollers 84 includes a friction drive roller 90, which is configured to drive the floating carriage to move in both directions relative to the base 52 (as indicated by arrow 62). The friction drive roller 90 is coupled to and driven by a drive motor 92. As shown, the second group 88 of rollers 84 includes a pair of rollers 94, 96 on the flanks of the friction drive roller 90. A pair of rollers 94, 96 is configured to support the floating carriage 50 on the bottom surface 91. The roller 94 is located on the front side 98 (facing the gantry in the CT imaging system), and the roller 96 is located on the rear side 100 (arranged on the opposite side of the gantry). The second group 88 of rollers 84 extends in the z direction between a pair of beams 80. As shown, the second set 88 of rollers 84 includes three rollers 84. However, the number of rollers 84 in the second set 88 of rollers 84 may be different. In certain embodiments, the second set 88 of rollers 84 includes a roller 84 configured to support the floating carriage 50, and a pair of friction drive rollers flanking the roller 84 and configured to drive the floating carriage 50 to move bidirectionally relative to the base 52.

[0056] Figure 7 It was taken along Route 7-7 Figure 4 FIG. 4 is a cross-sectional view of a patient table 46 . Figure 8 It was taken along line 8-8 Figure 7 A cross-sectional view of the patient examination table 46. The first set 86 of rollers 84 and the second set 88 of rollers 84 are as shown in FIG. Figure 6 As stated. Figure 7 and Figure 8 As shown, the respective ends 102 (longitudinal ends) of each roller 84 in the second set 88 of rollers 84 extend into the respective beam 80 in the pair of beams 80. In addition, the first set 86 of rollers 84 contact the top of the step 76 disposed along the edge adjacent to the first side 64 and the second side 66 of the floating bracket 50.

[0057] In addition, the plurality of rollers 84 include a third group 104 of rollers 84. The third group 104 of rollers 84 are disposed on the first side 64 and the second side 66 of the floating carriage 50. Both the first side 64 and the second side 66 extend between the top surface 89 and the bottom surface 91 of the floating carriage 50. The third group 104 of rollers 84 is configured to guide the bidirectional movement of the floating carriage 50 relative to the base 52. As shown, the rollers 84 in the third group 104 of rollers contact the respective sides 64, 66 of the floating carriage 50. The third group 104 of rollers 84 includes two rollers 84 on each side 64, 66 of the floating carriage 50 (see Figures 2 to 5 ). However, the number of rollers 84 in the third set 104 of rollers 84 on each side 64, 66 of the floating carriage 50 may vary.

[0058] In some embodiments, at least one roller 84 in the third set 104 of rollers 84 is configured to hold the floating carriage 50 on the fixed structure 78. In some embodiments, at least one roller 84 in the third set 104 of rollers 84 is configured to drive the floating carriage 50 to move in both directions relative to the base 52. In some embodiments, the third set 104 of rollers 84 includes a first roller 84 disposed on the first side 64 of the floating carriage 50 and a second roller 84 disposed on the second side 66 of the floating carriage 50, and both the first roller 84 and the second roller 84 are configured to drive the floating carriage 50 to move in both directions relative to the base 52.

[0059] like Figure 8 As shown, each roller 84 in the first set 86 of rollers 84 has an axis of rotation 106 extending in the z-direction. Each roller 84 in the second set 88 of rollers 84 has an axis of rotation 108 also extending in the z-direction. Each roller 84 in the third set 104 of rollers 84 has an axis of rotation 110 extending in the y-direction. In certain embodiments, the respective axes of rotation of different sets of rollers 84 may be different.

[0060] Figures 9 to 11are alternative arrangements of rollers 84 when the shape of the floating carriage 50 varies on the sides 64, 66. Although arrangements of rollers 84 are shown only for the second side 66 of the floating carriage 50, these arrangements may also be used on the first side 64 of the floating carriage 50. Fig. 9 It was taken along Route 7-7 Figure 4 Cross-sectional view of a patient table. Fig. 9 As shown, the side 66 of the floating bracket 50 has a tapered end 112. The tapered end 112 has a top surface 114 and a bottom surface 116.

[0061] One or more rollers 84 in the third set 104 of rollers 84 contact a top surface 114 of the tapered end portion 112 .

[0062] One or more rollers 84 in the third set 104 of rollers 84 also contact the bottom surface 116 of the tapered end 112. Each roller 84 in the third set 104 of rollers 84 that contacts the tapered end 112 (the top surface 114 or the bottom surface 116) is configured to both hold the floating carriage 50 on the fixed structure and guide the floating carriage 50 to move bi-directionally relative to the base. As shown, the rotation axis 110 of each roller 84 in the third set 104 of rollers 84 is parallel to the surface of the tapered end 112 contacted by the corresponding roller 84 (e.g., the top surface 114 or the bottom surface 116).

[0063] Fig.10 It was taken along Route 7-7 Figure 4 A cross-sectional view of a patient examination table 46 is shown. Fig. 9 As shown, the side 66 of the floating carriage 50 has no steps (i.e., is straight). One or more rollers 84 in the first group 86 of rollers 84 contact the top surface 89 of the floating carriage 50. Each roller 84 in the first group 86 of rollers 84 is configured to hold the floating carriage 50 on a fixed structure. One or more rollers 84 in the second group 88 of rollers 84 contact the top surface 114 of the tapered end 112. One or more rollers 84 in the third group 104 of rollers 84 contact the side 66. Each roller 84 in the third group 104 of rollers 84 is configured to guide the floating carriage 50 to move in both directions relative to the base. As shown, the rotation axis 106 of each roller 84 in the first group 86 of rollers 84 extends in the z direction. In addition, as shown, the rotation axis 110 of each roller 84 in the third group 104 of rollers 84 extends in the y direction.

[0064] Fig.11 It was taken along Route 7-7 Figure 4 A cross-sectional view of a patient examination table 46 is shown. Fig. 9As shown, the side 66 of the floating carriage 50 is rounded. One or more rollers 84 in the first group 86 of rollers 84 contact the top surface 89 of the floating carriage 50. Each roller 84 in the first group 86 of rollers 84 is configured to hold the floating carriage 50 on a fixed structure. One or more rollers 84 in the second group 88 of rollers 84 contact the top surface 114 of the tapered end 112. One or more rollers 84 in the third group 104 of rollers 84 contact the side 66. Specifically, each roller 84 in the third group of rollers has a concave surface 118 corresponding to the rounded side 66. Each roller 84 in the third group 104 of rollers 84 is configured to guide the floating carriage 50 to move bidirectionally relative to the base. As shown, the rotation axis 106 of each roller 84 in the first group 86 of rollers 84 extends in the z direction. In addition, as shown, the rotation axis 110 of each roller 84 in the third group 104 of rollers 84 extends in the y direction.

[0065] Fig.12 yes Figure 3 A schematic diagram of a patient 120 (eg, subject) disposed on a patient table 46 on a floating support 50. Fig.12 As shown, the floating carriage 50 is in a home position, wherein both the patient 120 and the floating carriage 50 are outside the gantry (not shown) of the CT imaging system. In the home position, the majority of the floating carriage 50 is located at the rear portion 100 of the base 52 and the fixed structure 78. In addition, the center of gravity of the patient 120 (indicated by arrow 122) is also located at the rear portion 100 of the base 52 and the fixed structure 78. This causes the front roller 124 and the middle roller 126 of the first set 86 of rollers 84 to act as load bearing members and to hold the floating carriage 50 on the fixed structure 78, as indicated by arrows 128, 130, respectively. This also causes the rear roller 132 of the second set 88 of rollers 84 to support the floating carriage 50, as indicated by arrow 134.

[0066] Fig.13 yes Figure 3 Another schematic diagram of a patient table 46 in which a patient is arranged on a floating bracket 50. Fig.13 As shown, the patient 120 is within the scanning range, and a portion of the patient 120 and a portion of the floating carriage 50 are both located within the gantry 12 of the CT imaging system. With a portion of the patient 120 and a portion of the floating carriage 50 located inside the gantry 12, a majority of the floating carriage 50 is located at the front 98 of the base 52 and the fixed structure 78. In addition, the center of gravity 122 of the patient 120 is also located at the front 98 of the base 52 and the fixed structure 78. This causes the middle rollers 126 and the rear rollers 136 of the first set 86 of rollers 84 to act as load bearing members and to hold the floating carriage 50 on the fixed structure 78, as indicated by arrows 138 and 140, respectively. This also causes the front roller 142 in the second set 88 of rollers 84 to support the floating carriage 50, as indicated by arrow 144.

[0067] Fig.14 It was taken along line 6-6 Figure 5 A cross-sectional view of a patient table 46 (e.g., with drive rollers on the side wings). In addition to the second set 88 of rollers 84, Fig.14 The structure of the patient examination table 46 is similar to Figure 6 The structure of the patient examination table. The second group 88 of rollers 84 contacts the bottom surface 91 of the floating carriage 50. A pair of friction drive rollers 146, 148 in the second group 88 of rollers 84 are configured to drive the floating carriage 50 to move bidirectionally relative to the base 52 (as indicated by arrow 62) (via a dual synchronous friction drive). This can achieve better carriage traction. The friction drive roller 146 is positioned adjacent to the front 98 of the fixed structure 78. The friction drive roller 148 is positioned adjacent to the rear 100 of the fixed structure 78. Each friction drive roller 146, 148 is coupled to and driven by a corresponding drive motor 150, 152. The second group 88 of rollers 84 also includes a roller 154. Roller 154 is centrally located between the pair of friction drive rollers 146, 148 and on the sides of the pair of friction drive rollers.

[0068] Fig.15 It was taken along Route 7-7 Figure 4 A cross-sectional view of a patient table 46 (e.g., with drive rollers on the side of a floating carriage 50). In certain embodiments, as Fig.15 As shown, each roller 84 in the second set 88 of rollers 84 (e.g., roller 96) is configured to contact the bottom surface 91 of the floating carriage 50 and support the floating carriage 50. In addition, as shown in Fig.15 As shown, the third set 104 of rollers 84 includes a friction drive roller 156 (e.g., contacting the first side 64 of the floating carriage 50) that is configured to drive the floating carriage 50 to move in both directions relative to the base 52. The friction drive roller 156 is coupled to and driven by a drive motor 158. In certain embodiments, other rollers 84 in the third set 104 of rollers 84 may be configured to guide the floating carriage 50 to move in both directions relative to the base 52.

[0069] Fig.16 yes Figure 4 A top view of a portion of a patient table 46 (eg, having a single friction drive) of a CT imaging system of FIG. Fig.16As shown, the third set 104 of rollers 84 includes a single roller 84 disposed on and in contact with the first side 64 of the floating carriage 50. The single roller 84 is a friction drive roller or wheel 160 (driven by a drive motor) that is configured to drive the floating carriage 50 to move in both directions relative to the base (as indicated by arrow 62). The third set 104 of rollers 84 also includes a pair of rollers 84 disposed on and in contact with the second side 66 of the floating carriage 50. The pair of rollers 84 on the second side 66 of the floating carriage 50 are configured to guide the floating carriage 50 to move in both directions relative to the base.

[0070] Fig.17 yes Figure 4 A top view of a portion of a patient table 46 of a CT imaging system (eg, having multiple synchronized friction drives). Fig.17 As shown, the third set 104 of rollers 84 includes a pair of friction drive rollers or wheels 162, 164 disposed on and in contact with the first side 64 of the floating carriage 50. The third set 104 of rollers 84 also includes a pair of friction drive rollers or wheels 166, 168 disposed on and in contact with the second side 66 of the floating carriage 50. The friction drive rollers 162, 164, 166, 168 (driven by respective drive motors) are configured to drive the floating carriage 50 to move bi-directionally relative to the base (as indicated by arrow 62). This configuration enables multiple synchronous friction drives on both sides 64, 66 of the floating carriage 50.

[0071] In certain embodiments, Figures 15 to 17 The friction drive rollers can each be spring loaded so that there is always a high pressure contact against the floating bracket 50 during the movement of the floating bracket 50 to avoid traction loss. In some embodiments, the housing associated with each friction drive roller can be configured to protect the patient from being pinched by the friction drive roller.

[0072] In certain embodiments, the home position of the floating bracket 50 (ie, the position when the floating bracket 50 is not disposed within the rack) may be adjustable. Fig.18 yes Figure 31 is a side view of a patient table 46 of a CT imaging system of FIG. The patient table 46 includes a cable retractor 170 (e.g., an adjustable cable retractor). The cable retractor 170 includes a first end structure 172 coupled to a fixed structure 78 (e.g., at the rear 100). The cable retractor 170 also includes a second end structure 174 coupled to the longitudinal end 70 of the floating carriage 50. The cable retractor 170 also includes a rope 176 extending between the first end structure 172 and the second end structure 174. The first end structure 172 acts as a housing for the rope 176 and also includes a torsion spring that provides tension to the rope 176 when coupled to the longitudinal end 70. The cable retractor 170 is configured to keep the longitudinal end 70 of the floating carriage 50 from extending beyond a fixed or set distance 178 from the fixed structure 78. The cable retractor 170 is also configured to be adjusted based on the size of the scanning room to change or set the fixed distance 178. The cable retractor 170 enables the original position of the floating carriage 50 to be maintained by a hard stop.

[0073] Fig.19 yes Figure 3 1 is a side view of a patient table 46 of a CT imaging system of the present invention. The patient table 46 includes a sensor 180 (e.g., an anti-collision sensor) coupled to the longitudinal end 70 of the floating carriage 50. The sensor 180 is configured to sense an object (e.g., a person, a wall, etc.) and send a signal to stop the floating carriage 50 from moving in the z direction to avoid collision with the object (e.g., to a signal to the floating carriage 50). Figure 1 In some embodiments, another sensor 180 may be disposed on the longitudinal end 68 of the floating carriage 50.

[0074] Fig. 20 Images comparing stress analysis results for a typical bracket to a floating bracket are shown. Image 182 indicates where supports are provided on a typical bracket. As shown in image 182, a fixed support is provided at one end of the bracket, wherein a roller support is located below. Image 184 indicates where supports are provided on a floating bracket. As shown in image 184, as described above, fixed supports are provided at the contact line of the retainer rollers along the sides of the floating bracket. In addition, as described above, three rollers provide support on the bottom surface of the floating bracket. Images 186 and 188 are stress graphs for a typical bracket and a floating bracket, respectively. As shown in images 186 and 188, for similar loading conditions and bracket cross-sections, the deflection and stress of the floating bracket are similar to the deflection and stress of the typical bracket.

[0075] Fig.21 is in a scanning room 190 sized for a typical patient table and by Figure 3 The smaller scanning room 192 can be realized by using the patient examination table 46 Figure 3 1 and 12. As described above, the patient table 46 includes an adjustable carriage home position. The room length 194 of the scanning room 190 is approximately 5000 millimeters (mm). In the scanning room 190, during maintenance, the floating carriage 50 can be pulled back (i.e., away from the gantry 12 in the x-direction) a first distance 196 to form a gap 198 between the gantry 12 and the patient table 46. In view of the room length 194, the first distance 196 can be up to about 205 mm. The floating carriage 50 is pulled back to the default carriage home position indicated by arrow 200. In the scanning room 190, the second distance 202 of the floating carriage 50 (in the default carriage home position) from the wall 204 can be up to about 580 mm. However, if the operator needs to enter the space between the wall 204 and the floating carriage 50, a portion of the floating carriage can be moved in the x-direction into the opening 48 of the gantry for a certain distance. Furthermore, by providing an adjustable cradle home position, the patient table 46 can be provided and used in a smaller scanning room (eg, scanning room 192). The room length of the scanning room 192 saves a distance of approximately 580 mm (as indicated by arrow 208). Fig.21 The distances recorded in may vary based on the size of the patient table in the scanning room and the size of the CT scanner.

[0076] If located adjacent to the door of the scanning room, use Figure 3 The patient table 46 can further reduce the size of the scanning room. Fig. 22 is the amount of energy in the scanning room 210 (e.g., during normal operation and during maintenance) Figure 3 A schematic diagram of a patient table 46 and a CT scanner (eg, gantry 12). Fig. 22 As shown, the patient table is arranged in the scanning room 210 so that the floating carriage 50 can be moved bi-directionally (as indicated by arrows 62 ) so that the floating carriage 50 can be moved into the gantry 12 or through the door opening 212 . Fig. 22 The top portion of illustrative embodiment shows a portion of a floating bracket 50 disposed within the opening 48 of the frame 12 during normal operation. Fig. 22 The bottom portion of the drawing shows a portion of the floating carriage 50 moved through the door opening 212 to create a gap 214 between the patient table 46 and the gantry 12 to enable access during maintenance. Moving the floating carriage 50 through the door opening 212 enables the room length 216 of the scanning room 210 to be further reduced (e.g., to 3870 mm).

[0077] Fig.23 yes Figure 2 The patient examination table 46 is shown in a side view. Figure 2Arrows 218 and 220 indicate that the floating carriage 50 moves in both directions relative to the fixed structure 78 in the x-direction. Since a long metal beam structure (eg, an extruded beam) is not used, both sides of the patient table 46 can be X-ray scanned using the floating carriage 50. Fig.24 and Fig.25 A CT scanner (e.g., gantry 12) and a Figure 2 Schematic diagram of a scanning room 222 of a mobile C-arm imaging system 224 with a patient examination table 46. Fig.24 As shown, the patient table 46 is utilized during a CT scanning procedure using a portion of a floating cradle 50 disposed within an opening 48 of the gantry 12. Fig.25 As shown, the patient table 46 is utilized during a stationary radiographic scanning procedure performed using a mobile C-arm imaging system 224. Fig.25 As shown, the floating bracket 50 moves out of the opening 48 of the gantry 12 and moves backward from the fixed structure 78 and the base 52. The C-arm 226 of the C-arm imaging system 224 is arranged around the floating bracket 50. In some embodiments, the ceiling-suspended C-arm imaging system can be used in conjunction with the patient examination table 46 in a similar manner. Since both sides of the patient examination table 46 have an X-ray scanning range, such as Fig.23 As shown, a single patient table 46 may be used as shown. Fig.24 and Fig.25 Multiple (eg, separate and distinct) imaging devices are shown in a common scanning room 222 .

[0078] Fig.26 A CT scanner (e.g., gantry 12) and a Figure 2 Schematic diagram of a scanning room 228 of a ceiling mounted C-arm imaging system 230 with a patient table 46. The patient table 46 is configured for bi-directional movement in the x-direction (as indicated by arrow 62). The ceiling mounted C-arm imaging system 230 is configured for bi-directional movement in the z-direction (as indicated by arrow 232) via a pair of linear motion rails 234. The base 52 of the patient table 46 is configured for bi-directional movement in the y-direction (as indicated by arrow 236). The patient table 46 is configured together for bi-directional movement in the x-direction (as indicated by arrow 238) via a pair of linear motion rails 240. The patient table 46 may be utilized during a CT scanning procedure performed using a floating carriage 50 disposed within an opening 48 of the gantry 12. The patient table 46 may also be utilized during a stationary radiography scanning procedure performed using the ceiling mounted C-arm imaging system 230, as shown. Fig.26As shown in the figure, the C-arm 242 of the ceiling-mounted C-arm imaging system 230 is arranged around a portion of the floating bracket 50 (for example, between the frame 12 and the fixed structure 78). As described above, since both sides of the patient examination table 46 have an X-ray scanning range, a single patient examination table 46 can be used, for example, Fig.26 Multiple (eg, separate and distinct) imaging devices are shown in a common scanning room 228 .

[0079] The technical effects of the disclosed embodiments include providing a patient table with a floating bracket that reduces the space size requirements for the CT scanner. The technical effects of the disclosed embodiments also include making it easier to transport, handle and install. The technical effects of the disclosed embodiments also include making serviceability easier due to the easy manipulation of the rack cover, thereby reducing the downtime of the CT imaging system. The technical effects of the disclosed embodiments include providing an enhanced platform for a patient table for use in combination with multiple imaging modalities. The technical effects of the disclosed embodiments also include reducing costs due to the lack of a long beam structure. The technical effects of the disclosed embodiments even include providing a low-cost solution for a multi-modal intervention / imaging environment in a public scanning room. The technical effects of the disclosed embodiments also include achieving a faster scanning process in the multi-modal intervention / imaging environment.

[0080] Reference is made to the technology presented and claimed herein and applied to physical and specific examples of a practical nature that clearly improves upon the present state of the art and, therefore, is not abstract, intangible, or purely theoretical. In addition, if any claim appended to the end of this specification contains one or more elements designated as "means for [performing] the function of ..." or "steps for [performing] the function of ...," it is intended that such elements be interpreted under 35 U.S.C. § 112(f). However, for any claim containing elements designated in any other manner, it is not intended that such elements be interpreted under 35 U.S.C. § 112(f).

[0081] This written description uses examples to disclose the subject matter, including the best mode, and also to enable those skilled in the art to practice the subject matter, including making and using any devices or systems and performing any included methods. The patentable scope of the subject matter is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insignificant differences from the literal language of the claims.

Claims

1. A patient examination table (46) for a computed tomography (CT) imaging system (10), the patient examination table comprising: Base (52); a floating carriage (50) configured to support a subject (22) to be imaged and to move bidirectionally relative to the base (52); a fixed structure (78) coupled to the base (52); and A plurality of rollers (84) are mounted to the fixed structure (78), wherein the plurality of rollers (84) are configured to both guide and support the floating carriage (50), and the floating carriage (50) is configured to guide itself when extended beyond the fixed structure (78).

2. A patient examination table (46) according to claim 1, wherein the fixed structure (78) includes a pair of beams (80) flanking a portion of the floating bracket (50), wherein the pair of beams (80) extend in a direction parallel to the longitudinal axis (49) of the floating bracket (50).

3. A patient examination table (46) according to claim 2, wherein the length (72) of the floating bracket (50) along the longitudinal axis (49) is greater than the corresponding length (82) of each beam (80) of the pair of beams (80) in the direction.

4. The patient examination table (46) according to claim 1, wherein the base (52) is configured to move bidirectionally in a vertical direction.

5. The patient examination table (46) of claim 1, wherein the plurality of rollers (84) includes a first set of rollers (84) disposed above the floating carriage (50) and a second set of rollers (84) disposed below the floating carriage (50).

6. The patient table (46) of claim 5, wherein the first set of rollers (84) are configured to retain the floating carriage (46) on the fixed structure (78).

7. A patient examination table (46) according to claim 5, wherein at least one roller (84) of the second group of rollers (84) is configured to support the floating bracket (50), and at least one roller (84) of the second group of rollers (84) is configured to drive the floating bracket (50) to move bidirectionally relative to the base (52).

8. A patient examination table (46) according to claim 7, wherein the second set of rollers (84) includes a friction drive roller configured to drive the floating bracket (50) to move bidirectionally relative to the base (52), and a pair of rollers (84) on the sides of the friction drive roller and configured to support the floating bracket (50).

9. A patient examination table (46) according to claim 7, wherein the second set of rollers (84) includes rollers (84) configured to support the floating bracket (50), and a pair of friction drive rollers on the sides of the rollers (84) and configured to drive the floating bracket (50) to move bidirectionally relative to the base (52).

10. The patient examination table (46) of claim 5, wherein the plurality of rollers (84) includes a third set of rollers (84) disposed on a first side (64) and a second side (66) of the floating bracket (50), wherein both the first side (64) and the second side (66) extend between a top surface and a bottom surface of the floating bracket (50).

11. The patient examination table (46) of claim 10, wherein at least one roller (84) in the third set of rollers (48) is configured to guide bi-directional movement of the floating carriage (50) relative to the base (52).

12. The patient table (46) of claim 10, wherein at least one roller in the third set of rollers is configured to retain the floating carriage (50) on the fixed structure (78).

13. The patient examination table (46) of claim 10, wherein at least one roller (84) of the third set of rollers (84) is configured to drive bi-directional movement of the floating carriage (50) relative to the base (52).

14. A patient examination table (46) according to claim 13, wherein the third group of rollers (84) includes a first roller (84) arranged on the first side (64) of the floating bracket (50) and a second roller (84) arranged on the second side (66) of the floating bracket (50), and both the first roller (84) and the second roller (84) are configured to drive the floating bracket (50) to move bidirectionally relative to the base (52).

15. The patient examination table (46) according to claim 1, further comprising a cable retractor (170), wherein the cable retractor (170) includes a first end structure (172) coupled to the fixed structure (78), a second end structure (174) coupled to the longitudinal end (70) of the floating bracket (50), and a rope (176) extending between the first end structure (172) and the second end structure (174), wherein the cable retractor (170) is configured to prevent the longitudinal end (70) of the floating bracket (50) from extending beyond a fixed distance (178) from the fixed structure (78), and wherein the cable retractor (170) is configured to be adjusted to change or set the fixed distance (178).

Images