Charging device and X-ray photography system

Abstract

The utility model provides a charging device and an X-ray photography system, the charging device is used for charging a flat panel detector, the charging device comprises a cavity wall, a cavity cover and a contact structure, the cavity wall encloses a charging cavity with an opening; the opening of the charging cavity is shielded by moving to be attached to or away from the edge of the cavity wall; the contact structure is fixedly connected with the cavity wall or the cavity cover, the contact structure comprises a charging end and an in-place detection end, the in-place detection end is used for being connected with a power supply, when the flat panel detector is connected with the charging end, the in-place detection end turns on the power supply, and when the flat panel detector is disconnected from the charging end, the in-place detection end turns off the power supply, so that the power supply does not need to be switched on and off manually; as long as the flat panel detector is placed in the charging cavity to be electrically connected with the charging end, the in-place detection end can detect a signal and activate the power supply. And after a user turns on the charging device and takes out the flat panel detector, the in-place detection end can detect a signal and turn off the power supply, so that the charging end is exposed in an external environment without a short circuit risk, and the energy consumption of the power supply is also reduced.

Description

Technical Field

[0001] The utility model belongs to the field of medical equipment, and in particular relates to a charging device and an X-ray photography system. Background Art

[0002] Flat panel detectors are the main components of X-ray imaging systems. They are placed on the part of the patient where the X-ray is to be taken to form a digital X-ray image. Since flat panel detectors are used frequently, they need to be charged promptly after each use, regardless of whether they have power or not, to ensure that the flat panel detector is always charged.

[0003] In a busy medical environment, when a wireless flat-panel detector needs to be used, calibrated, or maintained, personnel must remove the flat-panel detector from the charging device. This separation exposes the charging terminal of the charging device to the external environment. The charging terminal has multiple power contacts, and the power supply is not turned off. These contacts are close together, making them susceptible to adverse environmental influences. For example, dust or other conductive objects could cause electrical contact between the power contacts, leading to a short circuit. Furthermore, leaving the power supply on when the device is not charging increases energy consumption and reduces service life. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a charging device, which aims to automatically and timely disconnect the power supply after the flat-panel detector is removed from the charging device, so that the charging end is in a power-off state.

[0005] In order to solve the above technical problems, the present invention provides a charging device for charging a flat panel detector, comprising:

[0006] A cavity wall, wherein the cavity wall encloses a charging cavity having an opening;

[0007] The cavity cover can be moved to fit or move away from the edge of the cavity wall to cover the opening of the charging cavity;

[0008] The contact structure is fixedly connected to the cavity wall or cavity cover. The contact structure includes a charging terminal and a position detection terminal. The position detection terminal is used to detect the connection between the charging terminal and the power supply. The charging terminal and the flat panel detector have a connected state and a disconnected state:

[0009] In the connected state, the charging terminal is configured to be electrically connected to the flat panel detector, and the presence detection terminal detects a presence signal, which is used to activate the power supply;

[0010] In the disconnected state, the charging terminal is configured to be disconnected from the flat panel detector circuit, and the presence detection terminal detects an absence signal, which is used to turn off the power supply.

[0011] In one embodiment, the contact structure further includes a controller, which can receive an on-position signal and an off-position signal to activate or shut down the power supply accordingly.

[0012] In one embodiment, a switch structure is further included. The switch structure is installed on the cavity wall or cavity cover. The switch structure is in the electrical circuit between the charging terminal and the power supply. The cavity cover has an open state and a closed state relative to the charging cavity.

[0013] In the closed state, the switch structure connects the electrical circuit, and the charging terminal and the power supply current are connected;

[0014] In the open state, the switch structure disconnects the electrical circuit, and the charging terminal and the power supply current are disconnected.

[0015] In one embodiment, the switch structure is a direct-acting travel switch, which includes a bracket, a moving part, a normally open contact, and a normally closed contact. The bracket is mounted on a cavity wall or a cavity cover. The moving part is movably connected to the bracket. The normally open contact and the normally closed contact are fixedly connected to the bracket. The normally open contact and the normally closed contact are spaced apart. One end of the moving part is a conductive end, and the other end is a free end. The free end has a first position and a second position:

[0016] In the closed state, the free end is in the first position, the conductive end is connected to the normally open contact, and the normally open contact is closed;

[0017] In the open state, the free end is in the second position, the conductive end is connected to the normally closed contact, and the normally closed contact is closed.

[0018] In one embodiment, the direct-acting travel switch is provided on a contact surface between the cavity wall and the cavity cover, and the free end protrudes from the contact surface when in the second position;

[0019] In the open state, the cavity cover is away from the free end, and the free end is in the second position;

[0020] In the closed state, the cavity cover pushes the free end to the first position.

[0021] In one embodiment, the contact structure is installed in a middle area of a side surface of the cavity cover close to the charging cavity.

[0022] In one embodiment, a spring pin is further included. The spring pin is connected to the contact structure and is used to electrically connect the flat panel detector and the contact structure.

[0023] In one embodiment, a converter is further included. The converter is located in a current loop between the presence detection terminal and the power supply. The presence detection terminal can switch the converter to switch between a connected state and a disconnected state.

[0024] In one embodiment, the cavity cover fits the edge of the cavity wall by magnetic attraction or snap-fitting.

[0025] The present application also provides an X-ray imaging system, comprising a host and a flat-panel detector, and a charging device according to any one of the above embodiments, wherein the cavity wall of the charging device is connected to the host, and the flat-panel detector can be electrically connected through the charging end in the charging device to realize charging of the flat-panel detector.

[0026] Compared with the prior art, the charging device of the present invention has the following advantages: there is no need to manually turn the power on and off; as long as the flat-panel detector is placed in the charging cavity and electrically connected to the charging terminal, the presence detection terminal can detect the signal and activate the power supply; after the user opens the charging device and takes out the flat-panel detector, the presence detection terminal will detect the signal and turn off the power supply. In this way, even if the charging terminal is exposed to the external environment, there is no risk of short circuit, and power consumption is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a simplified side view of a charging device in one embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A schematic diagram of the contact structure in the embodiment;

[0029] Figure 3 yes Figure 1 Schematic diagram of current disconnection under the switch structure in the embodiment;

[0030] Figure 4 yes Figure 1 Schematic diagram of current closing under the switch structure in the embodiment;

[0031] Figure 5 FIG. 1 is a circuit diagram of a charging device in one embodiment.

[0032] In the accompanying drawings, the various reference numerals represent: charging device 10; cavity wall 11; cavity cover 12; flat panel detector 20; contact structure 30; charging end 31; in-position detection end 32; switch structure 40; moving part 41; conductive end 411; free end 412; normally closed contact 42; normally open contact 43; controller 50; converter 60. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0036] The present application provides a charging device 10 for charging and storing a flat panel detector 20 in an X-ray imaging system. Figure 1 and Figure 2 ,in, Figure 1 A simplified side view of the charging device 10 is shown. Figure 2 The schematic diagram of the contact structure 30 is shown. Specifically, the charging device 10 includes a cavity wall 11, a cavity cover 12 and a contact structure 30. Of course, it is understandable that some other existing devices and technologies such as power supplies and circuits are common knowledge and will not be described in detail here.

[0037] The cavity wall 11 encloses a charging cavity with an opening. The cavity cover 12 can be moved toward or away from the edge of the cavity wall 11 to cover the opening of the charging cavity. For example, the cavity cover 12 can rotate around a point on the outer shell of the cavity wall 11 to cover the charging cavity, or it can be pushed along the edge of the cavity wall 11 to slowly cover the charging cavity. The contact structure 30 is fixedly connected to the cavity wall 11 or the cavity cover 12. The contact structure 30 includes a charging terminal 31 and a presence detection terminal 32. The presence detection terminal 32 is used to detect the connection between the charging terminal 31 and the power supply. The charging terminal 31 and the flat-panel detector 20 have a connected state and a disconnected state. In the connected state, the charging terminal 31 is configured to be electrically connected to the flat-panel detector 20, and the presence detection terminal 32 detects a presence signal, which is used to activate the power supply. In the disconnected state, the charging terminal 31 is configured to be disconnected from the flat-panel detector 20, and the presence detection terminal 32 detects an absence signal, which is used to shut down the power supply.

[0038] Specifically, the charging terminal 31 and the presence detection terminal 32 both belong to existing technologies. There are multiple power contacts on the charging terminal 31. When the multiple power contacts are connected to the battery of the flat-panel detector 20, the necessary conditions for charging are provided. The presence detection terminal 32 can detect the conduction signal and determine that the flat-panel detector 20 is in place. There is a conditional relationship between the presence signal (conduction signal) and the power supply. The power supply is turned on or off depending on the presence or absence of the presence signal.

[0039] At present, in order to ensure that the multiple power contacts on the charging terminal 31 are not affected by the external environment and the power supply is not always in the on state, the staff usually needs to manually turn off the power supply after removing the flat-panel detector 20. Turning on the power supply before charging the flat-panel detector 20 brings inconvenience to the staff. The charging device 10 provided in the present application does not require manual power off and on. As long as the flat-panel detector 20 is placed in the charging cavity and electrically connected to the charging terminal 31, the in-place detection terminal 32 can detect the signal and activate the power supply. After the user opens the charging device 10 and removes the flat-panel detector 20, the in-place detection terminal 32 will detect the signal and turn off the power supply. In this way, even if the charging terminal 31 is exposed to the external environment, there is no risk of short circuit, and the power supply energy consumption will also be reduced.

[0040] Preferably, in one embodiment, the contact structure 30 further includes a controller 50 , which is capable of receiving a presence signal and an absence signal to activate or deactivate the power supply accordingly. The controller 50 can be a single-chip microcomputer or other control chip capable of processing signals. The controller 50 can quickly receive the presence signal or the absence signal and feed it back to the control terminal, which then determines whether the power supply should be activated. This makes the charging device 10 more intelligent and efficient.

[0041] In one embodiment, a switch structure 40 is further included. The switch structure 40 is installed on the cavity wall 11 or the cavity cover 12. The switch structure 40 is in the electrical circuit between the charging terminal 31 and the power supply. The cavity cover 12 has an open state and a closed state relative to the charging cavity. In the closed state, the switch structure 40 connects the electrical circuit, and the charging terminal 31 and the power supply current are connected. In the open state, the switch structure 40 disconnects the electrical circuit, and the charging terminal 31 and the power supply current are disconnected.

[0042] The above embodiment primarily ensures that the charging terminal 31 is powered off when the operator removes and replaces the flat-panel detector 20. Since the human body is conductive, this poses a safety hazard to both the flat-panel detector 20 and the operator. The switch structure 40 ensures that when the operator opens the cavity cover 12, the flat-panel detector 20 has already finished charging. When the flat-panel detector 20 is replaced, even if it is already connected to the charging terminal 31, charging does not begin. Charging only begins after the cavity cover 12 is closed and the switch structure 40 reconnects the electrical circuit.

[0043] In the above embodiment, the switch structure 40, the power supply, and the charging terminal 31 are in an electrical circuit. The switch structure 40 primarily functions as a switch, enabling the flow and disconnection of current. The design of the electrical circuit is already publicly available and will not be described in detail herein.

[0044] Preferably, in one embodiment, see Figure 3 and Figure 4 , Figure 3 The schematic diagram of the direct-acting limit switch in the power-off state is shown. Figure 4 The schematic diagram shows the current flow state. The switch structure 40 is a direct-acting travel switch, which includes a bracket (not shown), a moving portion 41, a normally open contact 43, and a normally closed contact 42. The bracket is mounted on the cavity wall 11 or the cavity cover 12, and serves to fix the moving portion 41 and the normally open contact 43 and normally closed contact 42. The moving portion 41 is movably connected to the bracket, and the normally open contact 43 and normally closed contact 42 are fixedly connected to the bracket. The normally open contact 43 and normally closed contact 42 are spaced apart. One end of the moving portion 41 is a conductive end 411, and the other end is a free end 412. The free end 412 has a first position and a second position:

[0045] In the closed state, the free end 412 is in the first position, the conductive end 411 is connected to the normally open contact 43, and the normally open contact 43 is closed;

[0046] In the open state, the free end 412 is in the second position, the conductive end 411 is connected to the normally closed contact 42, and the normally closed contact 42 is closed.

[0047] The direct-acting limit switch is an existing device that uses the collision of mechanical moving parts to move its contacts to connect or disconnect the control circuit to achieve a certain control purpose. In this embodiment, the mechanical moving part is the cavity cover 12 or the cavity wall 11. Figure 3 In this embodiment, when the cavity cover 12 is closed, the cavity cover 12 or the cavity wall 11 provides a thrust to the free end 412 of the moving part 41. The free end 412 and the conductive end 411 are an integrated or fixed device. The conductive end 411 connects the two contacts of the normally open contact 43 to connect the two contacts. One end of the two contacts is connected to the power supply, and the other end is connected to the charging end 31. When the power supply is activated by the presence detection end 32, the circuit is connected and the flat panel detector 20 starts to charge.

[0048] See Figure 4When the cavity cover 12 is opened, the thrust provided by the cavity cover 12 or the cavity wall 11 to the free end 412 disappears, and the moving part 41 will reset. The resetting power is usually provided by an elastic member. At this time, the conductive end 411 leaves the normally open contact 43, and the circuit is disconnected. The conductive end 411 can be supported on the normally closed contact 42, and the normally closed contact 42 is not energized; it can also stay at a certain position.

[0049] In other embodiments, the switch structure 40 may be a capacitive proximity switch or a reflective photoelectric switch. A capacitive proximity switch is a sensor that detects position without direct contact with moving parts. When the flat-panel detector 20 approaches the capacitive proximity switch, the dielectric constant of the capacitor changes, thereby changing the capacitance and the state of the circuit connected to the measuring head. This generates a switching signal, which further controls the on / off of the circuit connecting the power supply to the flat-panel detector 20. In this embodiment, the capacitive proximity switch or reflective photoelectric switch can be adjusted so that when the cavity cover 12 is closed, the capacitive proximity switch or reflective photoelectric switch generates a close signal, connecting the circuit; when the cavity cover 12 is opened, an open signal is generated, disconnecting the circuit.

[0050] Preferably, see Figure 1 In one embodiment, the direct-acting limit switch is arranged on the fitting surface of the cavity wall 11 and the cavity cover 12, and the free end 412 protrudes from the fitting surface when in the second position; in the open state, the cavity cover 12 is away from the free end 412, and the free end 412 is in the second position; in the closed state, the cavity cover 12 pushes the free end 412 to the first position.

[0051] As will be appreciated, the cavity wall 11 is a passive component and larger than the cavity cover 12, so it is more appropriate to place the direct-acting limit switch on the cavity wall 11. Of course, placing it on the cavity cover 12 is also acceptable. In this embodiment, the direct-acting limit switch is placed on the mating surface between the cavity wall 11 and the cavity cover 12. When the cavity cover 12 is closed, it squeezes the free end 412 protruding from the mating surface of the cavity wall 11, causing the free end 412 to switch from the second position in the static state to the first position where the conductive end 411 connects to the normally open contact 43. When the cavity cover 12 is opened, the free end 412 is in the second position, disconnecting the circuit.

[0052] In one embodiment, the contact structure 30 is mounted in the middle area of the side of the cavity cover 12 near the charging chamber. The charging port of the flat panel detector 20 is generally located in the middle area of its back. Therefore, placing the contact structure 30 in the middle area of the cavity cover 12 maximizes the contact area between the flat panel detector 20 and the cavity cover 12 during charging, and provides greater stability for the flat panel detector 20 during movement of the charging device 10.

[0053] Preferably, in other embodiments, a fixed structure may be provided to fix the flat panel detector 20, and the contact structure 30 may also be set according to the position of the charging port of the flat panel detector 20. Since the circuit conductor is a flexible circuit, it is easy to adjust the position, so it is relatively easy to change the position of the contact structure 30.

[0054] In one embodiment, a spring pin is further included. The spring pin is connected to the contact structure 30 and is used to electrically connect the flat panel detector 20 and the contact structure 30 .

[0055] Specifically, the spring pin is a relatively commonly used connector, which will not be described here. Similarly, the spring pin can be replaced by a magnetic connector, a pin / female connector, a spring connector, etc.

[0056] See Figure 5 , Figure 5 The circuit schematic diagram of the charging device in the present application is shown. In one embodiment, it also includes a converter 60. The converter 60 is located in the current loop between the presence detection terminal 32 and the power supply. The presence detection terminal 32 can switch the converter 60 to switch between the connected state and the disconnected state.

[0057] In this application, the converter 60 uses a DC-DC charging converter. Compared with the controller 50 directly connected to the power supply, the addition of the converter 60 in the circuit will make the circuit more stable and safe. The converter 60 can receive an in-place signal or an out-of-place signal, or receive other control signals from the controller 50, and then adjust the power switch accordingly.

[0058] In one embodiment, the cavity cover 12 is attached to the edge of the cavity wall 11 by magnetic attraction or snap-fitting. The magnetic attraction or snap-fitting can enable the cavity cover 12 to drive the movement of the moving part 41 and maintain the free end 412 in the first position.

[0059] When a user wishes to access the flat-panel detector 20, they first need to open the charging device 10 and then remove the flat-panel detector 20 from the charging device 10. During this continuous process, the user opens the cavity cover 12 of the charging device 10, which releases the pressure exerted on the direct-acting limit switch. This disconnects the normally open contact 43, generating a switch signal. This disconnects the circuit from the output of the converter 60 to the flat-panel detector 20, and the flat-panel detector 20 is no longer charged. The user then removes the flat-panel detector 20 from the charging device 10 while it is de-energized. After removal, the presence detection terminal 32 and the controller 50 determine that the flat-panel detector 20 is not in place based on the contact connection between the flat-panel detector 20 and the charging device 10, and they disable the converter 60, completely shutting down the charging power supply. Similarly, after using the flat-panel detector 20, the user first places the flat-panel detector 20 into the charging device 10. The presence detection terminal 32 and the controller 50 recognize that the flat-panel detector 20 is in place and enable the converter 60 to activate the power supply. The user then closes the cavity cover 12 of the charging device 10. The conductive end 411 of the direct-acting limit switch connects to the normally open contact 43, which closes, generating a switch signal that connects the power supply to the circuit of the flat-panel detector 20, and the flat-panel detector 20 begins charging. During this process, the user does not need to manually turn off the power supply and then remove and insert the flat-panel detector 20.

[0060] The present application also provides an X-ray imaging system, including a host and a flat-panel detector 20, and a charging device 10 in any one of the above embodiments, wherein the cavity wall 11 of the charging device 10 is connected to the host, and the flat-panel detector 20 can be electrically connected through the charging terminal 31 in the charging device 10 to realize charging of the flat-panel detector 20.

[0061] Specifically, the host includes various hardware devices and software programs, etc. The flat-panel detector 20 is the core technical component of the X-ray photography system, and it plays a vital role in X-ray imaging. The flat-panel detector 20 is a device that can directly or indirectly convert X-rays that penetrate the human body into electrical signals, thereby generating digital images. The charging device 10 can be placed below the host hardware devices, and the upper surface of the cavity wall is fixedly connected to the host. Medical staff can push the host to move for work. When the flat-panel detector 20 is needed, they only need to bend down to open the cavity cover 12, take out the flat-panel detector 20, and bend down again to put it back for charging after use.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A charging device for charging a flat panel detector (20), characterized in that: include: A cavity wall (11), wherein the cavity wall (11) encloses a charging cavity having an opening; a cavity cover (12), wherein the cavity cover (12) can be moved to fit into or away from an edge of the cavity wall (11) to cover the opening of the charging cavity; A contact structure (30) is fixedly connected to the cavity wall (11) or the cavity cover (12), and the contact structure (30) includes a charging terminal (31) and an on-site detection terminal (32). The on-site detection terminal (32) is used to detect the connection relationship between the charging terminal (31) and the power supply. The charging terminal (31) and the flat panel detector are in a connected state and a disconnected state. In the connected state, the charging terminal (31) is configured to be electrically connected to the flat panel detector (20), and the presence detection terminal (32) detects a presence signal, and the presence signal is used to activate the power supply; In the disconnected state, the charging terminal (31) is configured to be disconnected from the circuit of the flat panel detector (20), and the presence detection terminal (32) detects an absence signal, which is used to turn off the power supply.

2. The charging device according to claim 1, characterized in that The contact structure (30) further includes a controller (50), and the controller (50) is capable of receiving the on-site signal and the off-site signal to activate or shut down the power supply accordingly.

3. The charging device according to claim 1, wherein: The device further comprises a switch structure (40), the switch structure (40) being mounted on the cavity wall (11) or the cavity cover (12), the switch structure (40) being located in an electrical circuit between the charging terminal (31) and the power source, and the cavity cover (12) having an open state and a closed state relative to the charging cavity: In the closed state, the switch structure (40) is connected to the electrical circuit, and the charging terminal (31) is connected to the power supply current; In the open state, the switch structure (40) opens the electrical circuit, and the charging terminal (31) is disconnected from the power supply current.

4. The charging device according to claim 3, characterized in that The switch structure (40) is a direct-acting travel switch, comprising a bracket, a moving part (41), a normally closed contact (42) and a normally open contact (43). The bracket is mounted on the cavity wall (11) or the cavity cover (12). The moving part (41) is movably connected to the bracket. The normally open contact (43) and the normally closed contact (42) are both fixedly connected to the bracket. The normally open contact (43) and the normally closed contact (42) are spaced apart. One end of the moving part (41) is a conductive end (411), and the other end is a free end (412). The free end (412) has a first position and a second position. In the closed state, the free end (412) is in the first position, the conductive end (411) is connected to the normally open contact (43), and the normally open contact (43) is closed; In the open state, the free end (412) is in the second position, the conductive end (411) is connected to the normally closed contact (42), and the normally closed contact (42) is closed.

5. The charging device according to claim 4, characterized in that The direct-acting travel switch is arranged on a contact surface where the cavity wall (11) contacts the cavity cover (12), and the free end (412) protrudes from the contact surface when in the second position; In the open state, the cavity cover (12) is away from the free end (412), and the free end (412) is in the second position; In the closed state, the cavity cover (12) pushes the free end (412) to the first position.

6. The charging device according to claim 1, wherein: The contact structure (30) is installed in the middle area of the cavity cover (12) close to the side of the charging cavity.

7. The charging device according to claim 1, wherein: It also includes a spring pin connected to the contact structure (30), and the spring pin is used to electrically connect the flat panel detector (20) and the contact structure (30).

8. The charging device according to claim 1, wherein: The invention also includes a converter (60), which is located in a current loop between the on-site detection terminal (32) and the power supply. The on-site detection terminal (32) can switch the converter (60) to switch between the connected state and the disconnected state.

9. The charging device according to claim 1, wherein: The cavity cover (12) is attached to the edge of the cavity wall (11) by magnetic attraction or snap-fitting.

10. An X-ray imaging system comprising a host and a flat panel detector (20), characterized in that: The charging device comprises the charging device according to any one of claims 1 to 9, wherein the cavity wall (11) of the charging device is connected to the host, and the flat panel detector (20) can be electrically connected through the charging terminal (31) in the charging device to realize charging of the flat panel detector (20).

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