TWI558433B - A mobile x-ray unit and a method for dosimetry control - Google Patents

Description

Mobile X-ray unit and dose control method

The invention relates to a mobile X-ray unit comprising a base for accommodating a control unit and a power supply, and further comprising an articulated displaceable arm for supporting an X-ray treatment with an X-ray tube The device emits an X-ray beam through an exit window to illuminate a target.

More particularly, the present invention relates to a dosimetry control method for an X-ray beam emitted from a mobile X-ray unit.

The incidence of skin cancer has increased in the past 10 years in the 20th century, and professional medical personnel need to invest a lot of spirit in early diagnosis, logistics and providing appropriate treatment. However, it is gratifying that more than 1.3 million new skin cancers are diagnosed each year and increase at a rate of about 5% per year. Increasing exposure to the sun and reduction of the ozone layer without skin protection is the main reason - it is estimated that more than 1 billion euros will be spent each year on the medical costs of the disease. More than 80% of skin cancers occur in the head and neck areas, and 50% occur in patients over 60 years of age. Compared to current demographics, it is expected that by 2025 the elderly population will be twice as large as today.

Substantially non-proliferative of superficial lesions Non proliferated cancer can be treated in different ways. First, surgery can be considered. However, the disadvantage is that the waiting time is long and the postoperative treatment is complicated, and the risk of infection may be high after the postoperative trauma. Second, soft X-ray electron irradiation can be considered. This approach has the advantage of being non-invasive, with each treatment being as short as 2 minutes, and it is gratifying that radiation therapy techniques are commonly used as a finishing treatment to include a certain number of treatments.

Therefore, the more the incidence of skin cancer and the increase in the proportion of the elderly population in the overall demographics, pose a substantial challenge to cancer treatment and treatment materials.

In recent years, it has been generally recommended to use mobile and portable X-ray units, which can be used in the hospital's radiation therapy department. An implementation of such a portable unit is described, for example, in Patent Publication No. US2007/0076851. The known unit includes an X-ray device including an X-ray source and a filter device having a plurality of filters rotatably corresponding to a focal point relative to the X-ray tube for changing according to needs Filtering characteristics. A plurality of filters are disposed in the filter device and are disposed laterally relative to one of the longitudinal axes of the X-ray tube. Such a configuration requires additional considerations to provide an X-ray beam toward the filter plane. This known device uses a distance from the X-ray applicator relative to the patient's skin.

A disadvantage of this known X-ray tube is that the actual delineation control between the X-ray beam emitted from the X-ray device to the patient's area to be treated is not easy.

It is an object of the present invention to provide an improved mobile X-ray unit. More particularly, it is an object of the present invention to provide a mobile X-ray unit in which the X-ray beam can be provided in a controllable manner.

Based on this, the mobile X-ray unit according to the present invention comprises a phantom-based dosimetry system adapted to perform on-line or real time versus X-ray beams. Do a dosimetry check.

As used herein, "mobile" and "portable" are interchangeable and are equivalent to a device that can be easily moved or transported, for example, by a single individual or Transport device.

It has been found that the advantage of providing a prosthetic-based dosimetry system in accordance with the X-ray unit of the present invention is that a fast and robust device is provided which is guaranteed and has radiation safety control.

More preferably, the prosthetic-based dosimetry system includes a pre-manufactured, more preferably a solid, phantom block providing one or more spaces to accommodate a suitable dosimeter (dose Meter). More preferably, the dosimeter can be a film, an ionization chamber or a semiconductor detector. For facilitating film dosimetry, the prosthesis can be provided with an extendable drawer for receiving one or more of the film portions at their intended dwell position. For ionization chambers and semiconductor detectors, the prosthesis can include a predetermined cavity to accommodate the contained agent. The size of the gauge. The prosthesis may be more preferably made of a material having properties corresponding to the nature of the human skin. In a particular embodiment, the prosthesis may not only correspond to the nature of the human dose, but may also simulate its appearance, such as the hand, neck, ears, face, chest, nose or any other non-flat surface. Implemented on the prosthesis. It can be found to be particularly important to ensure proper treatment regimens and therapeutic rations. More particularly, the prosthesis can include suitable inserts for use in the pre-dose dosimetry as in therapy. For example, the prosthesis can include ear and nose inserts to ensure that these organs are illuminated with an electronic balance and appropriate dose distribution. It is conceivable to provide human prostheses of different shapes and sizes, for example, to cater for different sizes of adults, and for different sizes between children and adults.

In one embodiment, the dosimetry system can be configured to be coupled to a receptacle of the X-ray applicator, although a given chamber can be envisioned, and more preferably, the dosimetry system is coupled to a quasi-acceptance Collimator receptacle. For this purpose, a prosthetic based dosimetry system can be provided with a connection device similar to a collimator connected to a collimator chamber. The dosimetry system can be connected to an embodiment of an X-ray applicator, which will be described later with reference to Figures 5a and 5b.

In an X-ray unit according to an embodiment of the invention, the dosimetry system comprises a digital readout means which is particularly advantageous for providing an on-line and/or real time dosimetry system. The direct data is passed to a suitable data processing unit that can be configured to be in electrical communication with a controller of the X-ray unit.

In an X-ray unit according to another embodiment of the present invention, the dosimetry system can be configured to recognize at least one dose depth dose, one beam flatness, and one of the generated X-ray ranges. Dose rate.

More preferably, different embodiments can be considered. First, a dosimetric film can be provided to sense the X-rays produced by the X-ray tube in a direction substantially the same as one of the longitudinal axes of the emitted X-ray beams. Accordingly, the dose depth ratio can be measured. Additionally, one or more of the above films may be provided for other off-center measurements.

Next, a number of thermoluminescent dosimeters (TLDs) can be provided in the prosthesis along a given depth of the beam corresponding to the central axis of the X-ray range. Similarly, off-center measurements can also be obtained by properly positioning a dose meter at the desired location. The radiation of the thermoluminescence dating method can be read by a given reading unit and such data can be further analyzed. For example, the reader of the thermoluminescence dating method can output a computer file to a suitable data processing unit.

Next, the phantom may provide one or more cavities for housing one or more ionization chambers, or one or more semiconductor devices. Such dosimeters can be coupled to a metrology unit adapted to provide on-line dosimetry data. A signal sent from the measuring unit can be supplied to the control unit of the mobile X-ray unit according to the invention for recording dosimetry data and/or for adjusting the high voltage Power supply settings, if needed.

It is even better to use a micro-sized ionization chamber set. Alternatively, the recess may be provided with a diode radiation detector comprising a first set of surfaces positioned on the prosthesis-based dosimetry system and a second set positioned at a depth of 5 mm. More preferably, the second set of independent detectors are positioned outside of the shadow of the detectors of the first group. In a particular embodiment, 10 to 15 detectors can be provided at a depth of 5 mm, and 10 to 15 detectors can be provided at a depth of 10 mm, that is, away from the shadow of the detector at a higher position. More preferably, the absolute values of the first depth and the second depth used to provide the detector group can be selected to be different.

In an X-ray unit in accordance with another embodiment of the present invention, the dosimetry system is calibrated based on the absolute dose of the dose depth ratio. It can be found to be particularly advantageous when the prosthetic based dosimetry system is adapted to provide on-line or immediate absolute dose data. It is even better that such known techniques are required for calibration measurements to be absolutely calibrated with a dosimetric film, ionization chamber or semiconductor detector.

In an X-ray unit according to another embodiment of the present invention, the surface of the prosthesis is provided with an alignment pattern.

It may be found to be particularly advantageous to provide a targeting pattern on the surface and/or inside of the prosthesis. Even better, the internal pattern is visualizable and the material of the pattern needs to be substantially transparent.

More preferably, the aiming pattern can be used to identify the geometrical correspondence between the desired X-ray range and the actual X-ray range (geometric Correspondence), using a light source indicator to visualize all or part of it. More preferably, the geometry described above corresponds to the X-ray applicator being inspected at different angular positions.

A dosimetry system, such as a film or suitable device (TLD, ionization chamber or semiconductor detector), may include a plurality of measurement points, preferably distributed on a plane, when such devices are positioned in the X-ray range The read data is processed to establish dose data across the application range. For example, the data on the central axis and several surrounding data will be read, preferably at different radii distances. Based on this, not only the information of the absolute dose in the center range is obtained, but also the beam flattening information across the range is obtained. More preferably, a film dosimetry is available for this purpose.

A mobile X-ray unit according to another embodiment of the present invention further includes an indicator for visualizing at least a portion of the X-ray beam emitted from the exit window.

It has been found that when an indicator is provided to visually define at least a portion of the resulting X-ray beam, such as one of its central axes and/or all of the beam geometry, it can be found that the efficiency of the treatment can be substantially improved.

More particularly, this indication may facilitate positioning of the prosthetic dosimetry system relative to the X-ray beam. More preferably, the indicator includes a light source that can be disposed in the X-ray applicator or that can be disposed on an outer surface surrounding the X-ray applicator. In the former example, the light indicator can be configured to define a central axis of the X-ray beam and/or all of the beam geometry, while in the latter example, the light indicator can be configured to define an X-ray beam. The central axis, more preferably, is a predetermined distance from the X-ray device. The above characteristics are favorable When the X-ray device is used for a standard distance from the patient's skin. More preferably, however, the configuration of the light indicator surrounding the X-ray device is adjustable to indicate the central axis of the X-ray beam from different axial distances from the X-ray device. When with axial visualization, it is better to use a transparent prosthesis to provide an internal aiming pattern to identify coplanar alignment between the central beam of the prosthesis and the central beam of the X-ray range.

Alternatively, the dosimetry system can be coupled to the X-ray applicator such that the exit surface through which the X-ray beam passes can be in contact with the upper surface of one of the prosthetic based dosimetry systems.

In accordance with an embodiment of the present invention, a mobile X-ray unit includes two or more light sources that are concentrically arranged around the X-ray device. Although it is sufficient to provide only a single light source to produce a narrow beam, i.e., sufficient to indicate the central axis of the X-ray beam, it has been found to be more advantageous to provide a plurality of light sources to produce individual narrow beams at a predetermined distance from the exit surface of the X-ray treatment. Shanghai International Trade Fair. Based on this embodiment, an X-ray applicator is placed at a predetermined distance from the prosthesis as if the dosimetry system were installed relative to the X-ray beam. In order to ensure that the target portion is properly covered by the X-ray beam, the X-ray device can be positioned such that the center of the indicated X-ray beam is positioned substantially at the center of the prosthesis, and more preferably, provided When aiming at the pattern. The function of this embodiment is achieved by a regular shaped X-ray beam, for example when a circular, rectangular, elliptical, or triangular collimator is used to shape the X-ray beam.

According to an embodiment of the present invention, in the mobile X-ray unit, the indicator includes a light source disposed inside the X-ray treatment device to generate a beam preset for collimation. The instrument is intercepted to provide a light image of the X-ray field emitted from the exit surface.

In this embodiment, it can be found that it is better when the entire shape of the X-ray beam is defined. For example, when an irregular (irrdgular) beam profile is used. In this case, the light source can be provided close to the target, or through a mirror, off-axis, to produce a beam that is preset as a collimator. More preferably, the direction in which the beam extends is the same as the direction in which the X-ray beam extends. In an embodiment, when a mirror is used, the light source can advantageously be positioned off-axis.

In accordance with another embodiment of the present invention, a mobile X-ray unit includes a light source and an optical fiber configured to provide light from the light source for intercepting by the collimator.

An advantage of this embodiment is that the light source can be positioned outside of the X-ray device without affecting the overall size. For example, the light source can be disposed on the base of the X-ray unit, and the optical fiber can be from the base to the inside of the X-ray device to properly illuminate the collimator to obtain the optical image of the generated X-ray beam. .

In accordance with another embodiment of the present invention, a mobile X-ray unit includes a plurality of optical fibers distributed in an area of the X-ray treatment device above the collimator for illuminating a collimator opening for collimation The instrument opening intercepts a range of resulting light. This embodiment can be advantageous in obtaining a light range having a strong intensity.

In accordance with another embodiment of the present invention, the mobile X-ray unit includes a light source that emits a narrow beam of light disposed on the inside of the X-ray device to define a longitudinal axis of the X-ray beam. Better yet, use a miniature laser source (miniature laser source).

According to another embodiment of the present invention, an X-ray unit can be provided in an outer casing for detecting an X-ray beam.

More preferably, the X-ray unit in accordance with the present invention includes a primary timer that is set for a time for the high voltage supply to provide a predetermined radiation dose. The radiation sensor housed in the X-ray device can be part of a second timer, the loop of which is adapted to close the high voltage supply when the predetermined radiation dose is reached. In this way, radiation safety control can be improved.

It can be found that it is advantageous to provide a separate device for detecting the presence or absence of the generated X-ray beam. More preferably, in one embodiment, when the dosimetry system is operable to provide on-line or immediate absolute radiation dose data, the signal from the dosimetry system can be built in addition to the X-ray unit in accordance with the present invention. It is used in addition to the signal of the built-in radiation detector that performs quality control.

According to an aspect of the present invention, a dosimetry control method for emitting an X-ray beam from a mobile X-ray unit is provided. The mobile X-ray unit includes a base for accommodating a control unit and a power supply. And a cooler, and further comprising a hinged displaceable arm for supporting an X-ray device having an X-ray tube for emitting an X-ray beam, the method comprising:

A prosthetic based dosimetry system is provided for identifying at least one dose depth ratio of the X-ray beam.

More preferably, a physical prosthesis provides one or more dose meters for checking dose depth ratio, beam flatness, and dose rate. A prosthesis according to an aspect of the present invention can be manufactured from a material having a dose characteristic corresponding to human skin. In a particular embodiment, the prosthesis is humanoid-like, simulating the outer surface of a portion of the human body, such as the ears, hands, nose, chest, neck, and the like.

In accordance with another embodiment of the present invention, an indicator is provided at or adjacent to the X-ray applicator for visually defining at least a portion of the X-ray beam to position the prosthesis-based dosimetry system. More preferably, the indicator includes a light source configured to generate a range of light that is preset to be captured by a collimator opening to provide a visualized X-ray beam. Alternatively, the indicator can include a light source configured to define one of the longitudinal axes of the X-ray beam.

The above described objects, features, and advantages of the invention will be apparent from the embodiments of the invention. range.

The details disclosed in the specific embodiments of the present invention will be described in detail in conjunction with the drawings.

Figure 1a is a schematic diagram showing a mobile X-ray unit in accordance with an embodiment of the present invention. The mobile X-ray unit 10 includes a base 2 including at least one power supply unit, a cooling system, and a control unit for controlling an X-ray device (X-ray). The operation of the applicator 4 includes an X-ray tube housed in an outer casing. The X-ray device 4 is connected to the base 2 by a flexible cable 3, which can be at least partially housed in a displaceable panel 5 in. The X-ray applicator 4 is supported by an articulated displaceable arm 4a which may include a pivot for changing the position of the X-ray applicator 4 in space. The X-ray treatment device 4 includes a longitudinal axis and an exit window 8 through which the X-ray beam generated can be emitted. The hinged displaceable arm 4a can also be mechanically coupled to the displaceable panel 5 to change the position of the x-ray applicator 4 in the vertical direction. More preferably, the displaceable panel 5 is provided with a handle 6, whereby it can be easily operated. The displaceable panel 5 can be guided by a suitable rail so as to be substantially smooth and shock-free when displaced.

More preferably, the X-ray tube accommodates an X-ray tube having a coaxial geometry, wherein the X-ray beam 8a is intended to illuminate a target area to a patient ( One of the surfaces P of the patient P, which extends through the exit window 8 has a beam axis 8b substantially corresponding to the longitudinal axis of the X-ray tube. For example, this can be achieved by setting the longitudinal axis of one of the anodes of the X-ray tube substantially parallel to the longitudinal axis of the X-ray device 4.

In accordance with one aspect of the invention, a phantom-base based dosimetry system 9a, 9b is provided to provide a dose depth dose of at least the emitted X-ray range. More preferably, for the dosimetry system 9a, 9b, a system can be selected which produces on-line data. An ionization chamber and a solid state detector, for example, a semiconductor detector can be adapted for this purpose. These detectors are not only configured The surface of the prosthetic-based dosimetry system is also at a predetermined depth, such as a depth of 5 mm. The dose depth ratio and beam flatness can be obtained by providing a plurality of measurement points by measuring the radiation dosimeter parameters. More preferably, the dosimetry system can be operated to provide relevant data, such as an absolute dosimetry to perform a calibration. When measuring the dose depth ratio, several dose meters 9d (at least two) can be used at a given depth of the central axis 8b. For soft X-rays (50~130KV), it is sufficient to measure the surface and the data at a depth of 5mm. Even better, the dosimeter group can have 10 to 20 or even 50 detectors. In order to avoid interference with the prosthetic-based dosimetry systems, the dosimeter at depth 9c may be better positioned to the outside of the shadow corresponding to the dosimeter at surface 9b. More preferably, the signal from the dosimetry unit can be supplied to a control unit 21 of the X-ray device for on-line dose supply control and/or interruption.

More preferably, the X-ray device 4 and the dosimetry system 9a are positioned corresponding to each other, and the X-ray device provides an indicator disposed in the X-ray device 4 to be visually defined (visually Delineate) The range of X-rays produced by an X-ray tube. More preferably, the indicator includes a light source such as a light emitting diode, a laser, and the like.

The light source can be disposed on the inside of the X-ray device 4, or around the X-ray device 4, or can be remotely positioned, for example, on the base 2. In the latter example, light from a light source (not shown) can be directed toward the X-ray applicator using one or more suitable optical fibers. A more detailed description will be described later with reference to Figures 4a-4c of the drawings.

More preferably, the mobile X-ray unit 10 includes a base 2 equipped with a display 7 for feeding-backing the desired user information. The display 7 can be configured with a touch-sensitive screen for inputting appropriate data to the system. For example, the display panel includes means for switching the light source indicator, or alternatively, when the X-ray unit is turned on, the light source indicator can be always on. The user interface can be used to enter a prescribed dose and a possible prescription dose distribution, especially when a dose modifier is used to introduce a dose distribution across the X-ray range. When the gradient is in the dose profile. The user interface can be configured to display data on actual dose supply and dose supply distribution during treatment. More preferably, the dosimetry system is utilized, the dosing regimen can be compared to the actual dose supply, and if desired, the actual dose supply can be corrected at the next stage, causing the difference between the established and supply doses to exceed 1%.

Figure 1b is a schematic diagram showing a displaceable panel of a mobile X-ray unit in accordance with an embodiment of the present invention. In the enlarged schematic form, the component symbol 10a refers to a specific component of the displaceable panel 5. Based on this, the grip 6 can be used as a mechanical member to pull or push the displaceable panel 5. Alternatively, the grip 6 can be configured as an electronic actuator for triggering the motor (not shown) to displace the displaceable panel 5. For example, when the grip 6 is pulled to cause the motor to be activated, the displaceable panel 5 can be displaced in the direction A, and pushing the grip 6 can cause the displaceable panel 5 to be along Direction B drops. More preferably, the mobile X-ray unit is included to limit the displacement A device for shifting the distance of the panel 5. This has the advantage of ensuring the mechanical stability (limitation of the upper level) of the system on the one hand and the limitation of the lower level on the other hand. More preferably, the displaceable panel 5 can be moved using a built-in rail, the length of which can be selected to limit the range of movement of the displaceable panel 5 in a desired manner.

The pedestal 2 preferably includes a display 7, which can function as a suitable user interface 7a, for example, a patient's data such as a photo of the patient and/or a photo of the condition can be displayed. On the window 7b, the related patient information such as birthday, gender, dose prescription, and dose delivery protocol can be displayed on the window 7c. A button 7d can provide a touch function to input data, or a suitable hardware switch or button can be provided as appropriate.

Fig. 1c is a schematic view showing an X-ray unit with a displaceable function medical device according to an embodiment of the present invention. In accordance with one aspect of the present invention, the mechanism of the mobile X-ray unit is developed and constructed to support the X-ray applicator 4 to have a greater range of movement and rotational displacement.

Reference numeral 11 denotes a schematic embodiment in which the X-ray applicator is located in a parked position. For the sake of clarity, lines and fibers are not shown. In this position, it may be adapted to transmit the mobile X-ray unit towards a room and/or to be mobile near the patient. In order to retract the X-ray applicator as close as possible to the base 2, the hinged displaceable arm 4a is available under the outer portion 5a of the displaceable panel 5. Bent. In order to ensure the stability of the mobile X-ray unit during its maneuvering, a load block 2a close to the floor is provided to reduce the absolute position of the gravity point of the overall structure.

Reference numeral 12 denotes a schematic embodiment in which the X-ray treatment device 4 is located in one of the working positions, having an x-ray exit surface 8 facing the patient P, in order to The X-ray applicator has a suitable position relative to the patient P, and the displaceable panel is movable to a predetermined dwell position between the lowest position and the highest position of the displaceable panel 5. The articulated arm 4a can be used to properly rotate the X-ray applicator in accordance with a rotational axis. More preferably, the choice of the axis of rotation is the imaginary direction of the X-ray beam, and the X-ray device is oriented vertically from the exit surface.

Reference numeral 13 denotes an exemplary embodiment in which the X-ray treatment device 4 is located at the lowest position, for which purpose the displaceable panel 5 can be located at its lowest position and the hinged displaceable arm 4a can be oriented to the X-ray in a desired manner. Therapy.

2 is a block diagram showing the structure of a mobile X-ray unit according to an embodiment of the present invention. The mobile X-ray unit according to the present invention comprises a high voltage supply, and more preferably, is adapted to generate 50-75 KV X-rays in a suitable X-ray tube, a cooling The system is used to cool the X-ray tube during use, and a control system is used to control the electronic and electrical parameters of the sub-unit of the X-ray unit when in use. The component symbol 20 refers to a display control unit 21 and an X-ray treatment device (X-ray). The main unit of applicator)22. However, the X-ray tube can also be configured to operate in the range of 50 to 130 KV.

The control unit 21 preferably includes a hard wired user interface 21a for switching the opening and closing of the high voltage supply 21b. More preferably, the high voltage supply 21b includes a high voltage generator 21c having improved ramp-up and ramp-down characteristics. More preferably, the ramp-up time is approximately 100 ms. The hardwired user interface 21a can be configured to automatically activate a cooling system 21d when the high voltage generator is turned on. Additionally, control system 21 can include a primary controller 21e configured to control dose delivery when the X-ray device is in use. The primary controller 21e can provide a primary counter to delete the logged-in data after the X-ray illumination is initialized. This master calculator automatically shuts down the high pressure supply to the X-ray tube after reaching the established dose. More preferably, the established dose is at least dependent on the energy and dose rate at which X-rays are produced. Wherein, the above situation can be calibrated in advance, and corresponding calibration data is provided as much as possible, so that the main dose distribution control of the main controller can be achieved. More preferably, the secondary controller 21f provides an independent loop for initiating dose dispensing control, and the secondary controller 21f can be coupled to a dose meter for accommodation in the X-ray device. In the X-ray range before the collimator. Accordingly, the dose meter can be assigned to the actual dose, providing immediate data in view of changes in the dose during ramp up and ramp down of the high pressure source. Equally better, The control system may further include a safety controller 21g adapted to read data from the main controller 21e, and the secondary controller 21f turns off the high voltage generator 21c after the desired dose is dispensed. Alternatively, or in addition, the safety controller 21g can be coupled to an emergency stop, a door interlock, and a generator interlock.

The control system can further include a dose control 21h adapted to be in electrical communication with the prosthesis-based dosimetry system, and more preferably on-line. However, it is also possible that the dose controller 21h can receive data for the analyzed dose range and updated dose dispensing data.

The dose controller 21h is preferably configured to provide an interrupt signal that measures the difference between the on-line dose and the established dose and the measured dose. For example, the dose controller 21h can provide a suitable interrupt signal to the high voltage generator 21c.

The control system can further include an indicator controller 21i for controlling the light source to define at least a portion of the X-ray beam. Although the instructing controller 21i is coupled to the power supply unit 21b to turn on the light source when the system is turned on, the structure can be simplified, and more preferably, the light source can be switched as needed. Accordingly, the instructing controller can be configured to provide power to the light source when triggered by the user, and the user can provide an appropriate trigger signal through a device such as a user interface or, for example, through a dedicated hardware switch.

The X-ray device 22 preferably includes the following features: an X-ray tube 22a, pre-packaged in an outer shield 22k. The X-ray tube according to the present invention can provide a collision target, a collimator and an exit window with a coplanar geometry, whereby the generated X-ray beam extends substantially Parallel to the longitudinal axis of the X-ray tube. More preferably, the target-collimator is about 4 to 10 cm apart, more preferably about 5 to 6 cm. The distance between the impact target and the collimator is equal to the distance between the outer surface of the impact target and the median plane of the collimator. The X-ray treatment device may further include a beam hardening filter 22b selected to intercept low-energy radiation and a beam flattening filter 22c to intercept portions The X-ray radiation is used to produce a substantially flat beam profile near the exit surface of the X-ray applicator. Still further, the X-ray applicator 22 can include one or more collimator configurations to define the processing beam geometry. More preferably, a set of collimators can be used, for example, having diameters of 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 cm. More preferably, although a circular collimator is considered here, any form of collimator such as square, elliptic or custom made collimator Can be used. It can be found that the X-ray treatment device 22 provided with the automatic collimator detection mean 22f has the advantage that it is suitable for automatically signaling the collimator in use. More preferably, resistance sensing is used wherein each collimator is provided with at least one pair of projections for bridging the resistive path provided in the collimator receptacle. The resistance generated by this chamber constitutes the signal representative of the collimator in use. X Preferably, the light therapy device 22 includes a built-in temperature sensor adapted to emit temperature signals from the X-ray tube and/or its outer casing. The signal from the temperature sensor is received by the control system and loaded with an analysis system. Once the measured temperature rises beyond the allowable range, an alarm signal is generated, optionally, a high voltage is also provided. The shutdown signal of the generator. The X-ray device 22 further includes a radiation sensor 22h disposed inside the outer casing 22k for detecting the actual X-ray radiation emitted by the X-ray tube. More preferably, based on safety factors, the X-ray charge device 22 can further include a non-volatile data storage 22i for recording at least the operational parameters of the X-ray tube. Further, in order to enhance the safety of the radiation, the X-ray treatment device 22 can provide a radiation indicator 22j to provide a visual and/or an audio output for the user and/or patient to know X. The on/off state of the light pipe. More preferably, the radiation indicator 22j may comprise a plurality of distributed signaling means. More preferably, at least one of the signal means, for example, a light emitting diode (LED) is electrically connected to the X Light therapy device 22. More preferably, the signal device is provided on the X-ray device 22.

Figure 3 is a schematic diagram showing an X-ray unit according to the present invention having a prosthetic dosimetry system 100, the phantom-based dosimetry system 100 being adapted to be at a distance relative to the X-ray device (X-ray applicator) 4 positioning, which also represents the location of the patient. In general, the above distance is about 0.5 to 2 cm, however, it is conceivable that the above distance is as large as 10 cents. Prosthesis-based dosimetry Preferably, the system 100 is used to obtain all of the dose data between the X-ray device 4 and the phantom Ph, although for the sake of clearing the display, the prosthesis Ph is displayed as a tablet. Structure, however, the prosthesis Ph may also be a non-planar structural surface corresponding to a human or external organ, which may represent a humanoid prosthesis. More preferably, the human prosthesis has a mass Z corresponding to human soft tissue.

In order to align the prosthesis Ph with the X-ray applicator 4, the former is provided with alignment means, while the latter provides means for visualizing the X-ray beam. Moreover, it is preferred to utilize only a laser to visualize only the central beam of the X-ray beam 8a.

The X-ray device 4 as described above includes an X-ray tube configured with an anode 1 having a target region 1a for generating a divergent X-ray beam 8a. The impact target range 1a is substantially flat and extends substantially perpendicular to the longitudinal axis of the anode 1, although it is preferred that the anode 1 tends to be coaxial with the beam axis 8b of the X-ray beam (and X-ray tube). Other relative directions are also possible. The resulting X-ray beam is emitted from an X-ray applicator from an exit surface 8'. For clarity, suitable filters, collimators and outlets in the X-ray tube The exit window is not shown. Accordingly, the exit surface 8' does not necessarily correspond to the exit window of the X-ray tube.

More preferably, an indicator can be used to position the X-ray applicator 4 relative to the target area of the patient. The indicator may include two light sources 15a, 15b configured to generate a narrow beam light, the light source being mountable to a corresponding support arm 16a, 16b, by means of these devices on the outer surface of the X-ray device 4. More preferably, the light source is configurable to provide a point C on the space corresponding to the beam axis 8b. A dosimetry system can be concentrated relative to a point C to intercept the X-ray beam.

In order to obtain the dose depth dose data of the prosthesis Ph, a plurality of dose meters may be provided, distributed therein, for example, a quantity of dosimetric film may be provided in the horizontal The cross-X-ray range is at its characteristic depth, for example at 5 mm, 1 cm and 5 cm. These films can check the beam flatness at a given depth.

Alternatively, a dose measuring film may be provided extending over the vertical plane of the prosthesis Ph and passing through the central axis 8b, such configuration being used to provide continuous depth dose data.

More preferably, the prosthesis Ph can be used in a variety of ways with a plurality of radiation detectors, which are now available for soft X-ray dosimetry. These prior art techniques can be used to correspond to the prosthesis Ph of the present embodiment.

More preferably, the prosthetic dosimetry system 100 provides on line reading, which can be provided by connecting to the dose control unit 21 using a suitable cabling 19, as shown in FIG. Show. More preferably, the cable 19 can be used in conjunction with an eletronic dose meter, such as an ionization chamber or a semiconductor detector.

Although the dosimetry system of the above embodiment is described with reference to an X-ray applicator provided with a range defining device, the present invention can also be practiced without the indicator defining the X-ray range.

Figure 4a is a cross-sectional view showing the indicator of the first embodiment of the X-ray device of the mobile X-ray unit according to the first embodiment of the present invention, the indicator being used to define the emission from the X-ray device X-ray range. The X-ray applicator 30 includes an outer housing 36 that houses an X-ray tube assembly 35 with an external shielding 35a.

According to one aspect of the present invention, the X-ray device 30 further includes a light source 48a that cooperates with a mirror 48 to emit light, that is, an X-ray beam generated by the X-ray tube. Beam indication. More preferably, the X-ray has a propagation axis 45a that fits the longitudinal axis of the X-ray tube. Light source 48a and mirror 48 are configured such that the resulting beam of light can extend substantially along the longitudinal axis of X-ray tube assembly 35.

When the resulting beam is intercepted by a collimator 33, one of the X-ray beams can be visually sensed to facilitate accurate alignment between the X-ray applicator and the target area of the patient.

More preferably, the distance between the impact target (anode) and the collimator 33 is about 4 to 10 cm, more preferably about 5 to 6 cm, so that the relatively short impact target-collimation The instrument distance is advantageous for generating an X-ray beam having a substantially narrow penumbra (about 1.5-1.8 mm per 20/80% of the line) and a preferred beam flatness.

The X-ray applicator 30 further includes a filter 39 to harden the X-ray beam emitted from the impact target 45, a beam flattening filter 40 to flatten the beam profile, and a quasi-junction The straight gauge 33 is inserted into a collimator receptacle 41.

In order to avoid overheating of the X-ray tube during use, a cooling system 34 will be provided, advantageously disposed between the X-ray tube assembly 35 and the external mask 35a, and with the X-ray tube assembly 35. The surfaces are in contact. A suitable refrigerant can be provided by a pipe 31. More preferably, the refrigerant is recyclable and can be water or a compressed gas. The X-ray device 30 can further include a temperature sensor 37.

The X-ray applicator 30 can further include a suitable radiation detector 38 coupled to a radiation indicator 43. More preferably, the data collected by the radiation detector 38 is stored to a data storage unit 44.

To protect the X-ray exit surface of the X-ray applicator 30 from contamination during the clinic, an exchange cap 42 may be provided to cover at least the exit surface of the X-ray applicator 30. More preferably, the thickness of the applicator cover is thick enough to completely intercept the secondary electrons emitted by the X-ray device. More preferably, the cap is made of polyvinylidene fluoride (PVDF) and has a thickness of about 0.4 to 0.7 mm, more preferably 0.6 mm, across the window portion. A density of about 1.75 to 1.8, more preferably a density of 1.78. Alternatively, the cap is made of polyphenylsulfone (PPSU). The thickness of the portion spanning the window is about 0.3 to 0.6 mm, more preferably 0.5 mm, and has a density of about 1.30 to 1.45, more preferably 1.39. It has been found that the above materials are particularly suitable for use herein due to their stability under the influence of X-rays and are suitable for different types of sterilization, such as chemical sterilization or sterilization at elevated temperatures.

Figure 4b is a cross-sectional view showing the indicator of the second embodiment of the X-ray device of the mobile X-ray unit according to the second embodiment of the present invention. In the present embodiment, an optical fiber 47a is provided. The collimator chamber 41 is above the collimator 33, and the optical fiber 47a is configured to generate a light field substantially centered on the opening of the collimator 33 to simulate X-rays emitted from the collimator. The beam, for this purpose, the fiber 47a is a beam that is configured to be substantially narrower than the expected X-ray beam.

Alternatively, it is possible to use an optical fiber 47a for visualizing the central axis 45a of the X-ray beam. In this example, the fiber is preferably configured to emit a narrower beam source to produce a smaller spot of light on the surface of the patient. More preferably, the size of the spot is less than 5 mm ² , and more preferably the spot size is about 1 mm ² . A suitable light emitting diode or laser can be used to generate light emitted from the optical fiber 47a. More preferably, the light emitting diode and the laser are disposed remotely relative to the X-ray applicator 30. It will be appreciated that one or more light sources may be used in conjunction with one or more optical fibers in another alternative configuration.

Figure 4c is a cross-sectional view showing the indicator of the third embodiment of the X-ray device of the mobile X-ray unit according to the third embodiment of the present invention. In the present embodiment, the X-ray applicator has a strike target 45 for generating an X-ray beam 45c having an X-ray longitudinal axis 45a, which is provided with an external indicator (external The indicator is used to visualize the longitudinal axis 45a from a pre-determined distance D from the lower surface 49 of the X-ray device, and more preferably, the bottom surface 49 corresponds to The exit window shown in Fig. 1c corresponds to the applicator cover as shown in Fig. 4.

The external indicator includes one or more light sources 52a, 52b disposed on respective support arms 54a, 54b to individually generate light beams 53a, 53b, which are direct It is oriented towards the longitudinal axis 45a and is adapted to meet at a predetermined distance D from the bottom surface 49 of the X-ray applicator 30. Even better, the established distance D is chosen to be between 0.5 and 2 cm. The support arms 54a, 54b are in a state in which the light beams 53a, 53b are not blocked by the X-ray applicator.

When the X-ray applicator is positioned relative to the patient P, the former must operate in such a manner that the beams 53a, 53b meet on one of the surfaces of the patient. However, when the treatment protocol should use a dose build-up material, the beams 53a, 53b can cross the surface of the dose enhancing material. More preferably, the support arms 54a, 54b are adjustable to indicate the central axis 45a at different distances from the bottom surface 49 of the X-ray applicator.

To calibrate the adjustment of the support arm, a transparent calibration phantom may be used in which the central axis and depth have been indicated. It can be understood that although the 4a-4c diagrams respectively show indicators of different embodiments, it is also feasible to use them in combination. for example, An indicator to indicate the center axis can be combined with an indicator to indicate the full range. In addition, internal and external indicators can also be combined.

Figure 5a is a schematic illustration of a prosthetic-based dosimetry system in accordance with an aspect of the present invention, in accordance with an embodiment of the present invention, an X-ray applicator 4 and a prosthesis-based dosimetry system are adapted to form a fixed structure (affixed configuration) 60. For example, a prosthetic based dosimetry system can be screwed, clicked, slided, or otherwise secured to the X-ray applicator 4. In the present embodiment, a phantom-based dosimetry system 61 includes a handle 62 for holding a member. The X-ray applicator 4 or prosthesis-based dosimetry system can be provided with a suitable body 64 that cooperates with an appropriate number of screws 67a, 67b to securely connect the dosimetry system to X-rays. Charger. The body 63 of the prosthesis-based dosimetry system can be made of a plastic material or, more preferably, a tissue equivalent material.

It has been found that the benefit of providing a prosthetic-based dosimetry system that can be coupled to the X-ray applicator 4 is that suitable dose measurements can be performed on X-ray applicators 4 of different angles.

Figure 5b is a cross-sectional view showing a prosthesis-based dosimetry system as shown in Figure 5a. As shown in Figure 5a, the X-ray device 4 provides a beam of X-ray radiation 8a, which is configured to Preferably, the prosthesis-based dosimetry system 61 can include a background material 63 and a similar or different material 66 for accommodation. Detector group. For example, PCB The material can be used to house the detector.

In one embodiment, a radiation detector is provided in a prosthetic based dosimetry system for providing a signal representative of the measured radiation dose. For example, the background material 63 can include a transmitter 68 electrically coupled to the detector and adapted to wirelessly transmit the corresponding read signal. The conveyor 68 can be provided wherever desired, on the inside or inside of the prosthesis, and more preferably on the outside of the X-ray beam. Alternatively, the prosthesis is provided with an electronic device that can be connected to an external data interceptor or data processing unit using a suitable cable. Conventional techniques can be used to implement the data transfer unit in the above embodiments.

Figure 6 is a schematic view showing an X-ray tube of a mobile X-ray device according to another embodiment of the present invention, and Figure 6E-E is a longitudinal sectional view showing an X-ray device of an embodiment, 6F-F The figure shows an embodiment as shown in Figures 6E-E which shows a cathode. The X-ray tube 100 has a body 102 with a closed end at one end and an end window 104 at the other end, from which X-rays are emitted. The end window is made of thin sheet of Beryllium. The end window 104 is covered by an applicator cap 106 to protect the window portion from damage and to protect against metal toxic effects. The applicator cover 106 is preferably made of a plastic material.

In the tube body 102, a strike target 108 is located about 4 to 10 centimeters from the collimator 130, and more preferably about 4 to 6 centimeters from the collimator 130 (see section 6F). -F map), this distance is equal to the outer plane of the impact target plate and the midplane of the collimator 130 the distance between. The impact target 108 is fabricated from Tungsten metal to provide the desired X-ray spectrum. The tungsten tip of the impact target 108 is mounted on a large anode assembly 110, which is also provided as a function in the impact target 108 to conduct heat generated by the generation of X-rays. Most anode assemblies are made of copper. The cathode 112 is located slightly off-axis near the end window, and the electrons emitted from the cathode are accelerated across the potential difference between the cathode and the anode, which is set to about 70 KV in this example, and reaches the impact target as in the prior art. 108, where the X-ray is struck and X-rays are generated, and the X-rays emitted from the impacting target 108 are subjected to a beam hardening before passing through the collimator 130 and passing through an exit surface 124 on the medicated cap 106. Beam hardening filter 122. The collimator 130 can be mounted on a suitable collimator receptacle 128.

The anode assembly 110 is mounted in the body 102 and is electrically insulated. Several known techniques and conventional materials can be used to provide the desired degree of insulation between the anode and the body 102.

As is known in the art, the generation of X-rays generates a large amount of waste heat, and therefore, it is necessary to maintain the tube cooling below a safe temperature. A variety of cooling mechanisms are known and can be used. In this embodiment, the cooling of the tube is cooled by means of water forced around the anode region, the water entering the back of the tube by means of a conduit 116 device, and by means of a second conduit 118 device go away. The water cooling circuit is a closed loop circuit with a remote cooler (not shown) before the water leaves the tube to be cooled and before the return tube. Or oil or other fluids can be used as cold But the media. In some applications, compressed gas can also be used as an effective coolant.

As in the prior art, X-rays are generated and emitted in all directions, except for the shelter of the tube body 102 and other internal component shields, thereby minimizing the amount of radiation from the tube body and making more radiation. Shoot from the end window. The thickness of the shield provided by the tube body is designed to at least provide the minimum level of shading required for safe use by the user.

A high voltage cable assembly 120 is coupled to the anode assembly 110. The high voltage line assembly is connected to a flexible cable means (not shown) which is in turn connected to the high voltage power supply.

A radiation detector 114 is disposed outside the path of the X-ray beam exiting the impact target 108 to the end window 104. The detector can be any known radiation detector. In this embodiment, it is connected to an amplifier using a conventional radiation hardened semi-conductor. When the X-ray tube 100 is operating and emits X-ray energy, the radiation detector 114 begins to detect. The output of the detector is coupled to a control unit whereby the output signal can be provided as an optical indication to confirm that the X-ray tube is in operation. The device can provide an X-ray detector for detecting whether the X-ray tube is activated or deactivated.

The radiation detector 114 is further calibrated to control the determination of the arrival of the patient and calculate the X-ray dose during the course of treatment. The device can have an instant dose measurement system whereby the precise radiation dose can be determined. Once available The dose rate is determined and the treatment schedule can be adjusted. This has the advantage of achieving an accurate and precise X-ray dose control that is to be controlled.

In order for the tube 102 to be properly placed on a tumor, a tumor illumination device is used. The tumor illumination device can include a plurality of light sources 126 placed at the periphery of the tube near the end window. When used, the light from the source is on the patient's skin. Since the light source 126 is located around the circumference of the tube body 102, a small distance from the end of the tube, a circle of light is created, the interior of which is empty. In this way, the position of the light creates a shadow at the tube body 102. This shaded circle is used to indicate the area where the target is radiated when the X-ray tube is activated. The inside of the circle will not be completely black, as ambient light will enter this shaded area.

More preferably, the light source 126 is a white LED that is bright enough to clearly illuminate the target area without excessive heat generation and a long lifetime. The absence of heat is important because the source is very close to the patient's skin and, as importantly, the risk of skin wrap or other damage is minimized. Light-emitting diodes of other colors can of course also be used. Alternatively, other sources of light may be used, such as a conventional filament lamp, or even a remote light connected to a ring by a fibre optic cable.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The invention The scope of protection is subject to the definition of the scope of the patent application attached.

1‧‧‧Anode

1a‧‧‧target range

2‧‧‧Base

2a‧‧‧Load block

3‧‧‧flexible cable

4‧‧‧X-ray applicator

4a‧‧‧ articulated arm (articulated displaceable arm)

5‧‧‧Displaceable panel

5a‧‧‧outer portion

6‧‧‧Handle

7‧‧‧Display

7a‧‧‧user interface

7b‧‧‧window

7c‧‧‧window

7d‧‧‧ button (button)

8‧‧‧Exit window/X-ray exit surface

8'‧‧‧Exit surface

8a‧‧‧X-ray beam

8b‧‧‧beam axis

9a, 9b‧‧‧dosimetry system

9c‧‧‧depth

9d‧‧‧dose meter

10‧‧‧mobile X-ray unit

15a, 15b‧‧‧light source

16a, 16b‧‧‧support arm

19‧‧‧Cable (cabling)

21‧‧‧control unit

21a‧‧‧user interface

21b‧‧‧high voltage supply/power supply unit

21c‧‧‧high voltage generator

21d‧‧‧Cooling system

21e‧‧‧primary controller

21f‧‧‧secondary controller

21g‧‧‧safety controller

21h‧‧‧dosimetry control

21i‧‧‧indicator controller

22‧‧‧X-ray applicator

22a‧‧‧X-ray tube

22b‧‧·beam hardening filter

22c‧‧·beam flattening filter

22d‧‧‧collimator

22e‧‧‧applicator cap

22f‧‧‧Automatic collimator detection mean

22g‧‧‧ housing temperature sensor

22h‧‧‧radiation sensor

22i‧‧‧non-volatile data storage

22j‧‧‧radiation indicator

22k‧‧‧outer shielding

30‧‧‧X-ray applicator

31‧‧‧pipe

33‧‧‧collimator

34‧‧‧Cooling system

35‧‧‧X-ray tube assembly

35a‧‧‧External shielding

36‧‧‧outer housing

37‧‧‧temperature sensor

38‧‧‧radiation detector

39‧‧‧Filter

40‧‧‧beam flattening filter

41‧‧‧collimator receptacle

42‧‧‧Therapy cover (exchange cap)

43‧‧‧radiation indicator

44‧‧‧data storage unit

45‧‧‧ impact target (target)

45a‧‧‧propagation axis/central axis

45c‧‧‧X-ray beam

47a‧‧‧optical fiber

48‧‧‧Mirror (mirror)

48a‧‧‧light source

49‧‧‧lower surface

52a, 52b‧‧‧light source

53a, 53b‧‧‧light beam

54a, 54b‧‧‧support arm

60‧‧‧Fixed configuration

61‧‧‧Phenomenon-based dosimetry system

62‧‧‧Handle

63‧‧‧ body

64‧‧‧ body (body)

66‧‧‧Background material

67a, 67b‧‧‧screw

68‧‧‧transmitter

100‧‧‧Phenomenon-based dosimetry system/X-ray tube

102‧‧‧ body

104‧‧‧End window

106‧‧‧Applicator cap

108‧‧‧ impact target (target)

110‧‧‧Anode assembly

112‧‧‧cathode

114‧‧‧radiation detector

116‧‧‧catheter (conduit)

118‧‧‧second conduit

120‧‧‧High voltage cable assembly

122‧‧‧beam hardening filter

124‧‧‧Exit surface

126‧‧‧Light source

128‧‧‧collimator receptacle

130‧‧‧collimator

C‧‧‧ gathering point

D‧‧‧pre-determined distance

P‧‧‧patient

P’‧‧‧Surface

Ph‧‧‧prosthesis (phantom)

1a is a schematic view showing a mobile X-ray unit according to an embodiment of the present invention; FIG. 1b is a schematic view showing a displaceable panel of a mobile X-ray unit according to an embodiment of the present invention; FIG. 2 is a schematic diagram showing the structure of a mobile X-ray unit according to an embodiment of the present invention; FIG. 3 is a schematic diagram showing the structure of a mobile X-ray unit according to an embodiment of the present invention; The X-ray unit has a schematic diagram based on a prosthetic dosimetry system; and FIG. 4a is a cross-sectional view showing the X-ray device of the mobile X-ray unit according to the first embodiment of the present invention depicting the indicator of the first embodiment; Figure 4b is a cross-sectional view showing the indicator of the second embodiment of the X-ray device of the mobile X-ray unit according to the second embodiment of the present invention; and Figure 4c is a view showing the third embodiment of the present invention. The X-ray device of the mobile X-ray unit is depicted in cross-section of the indicator of the third embodiment; Figure 5a is a schematic view of a prosthesis-based dosimetry system in accordance with one aspect of the present invention; Figure 5b is a cross-sectional view showing a prosthesis-based dosimetry system according to an embodiment of the present invention, for example, Figure 5a; and Figure 6 is a view showing an X-ray tube of a mobile X-ray unit according to another embodiment of the present invention. Figure 6E-E is a schematic longitudinal cross-sectional view showing an X-ray device of an embodiment; and Figure 6F-F shows a cathode as shown in the embodiment of Figure 6E-E.

2‧‧‧Base

3‧‧‧flexible cable

4‧‧‧X-ray applicator

4a‧‧‧ articulated arm (articulated displaceable arm)

5‧‧‧Displaceable panel

6‧‧‧Handle

7‧‧‧Display

8‧‧‧Exit window

8a‧‧‧X-ray beam

8b‧‧‧beam axis

9a, 9b‧‧‧dosimetry system

9c‧‧‧depth

9d‧‧‧dose meter

10‧‧‧mobile X-ray unit

21‧‧‧control unit

P‧‧‧patient

Claims (23)

A mobile X-ray unit includes a base for accommodating a control unit and a power supply, and further comprising a hinged displaceable arm for supporting an X-ray device having an X-ray tube to Illuminating a target by emitting an X-ray beam through an exit window, wherein the mobile X-ray unit further comprises a prosthetic-based dosimetry system having an equivalent tissue material, suitable for performing an online or an instant Dosimetry check of the X-ray beam. The mobile X-ray unit of claim 1, wherein the dosimetry system comprises a digital read out means. The mobile X-ray unit of claim 1 or 2, wherein the dosimetry system is configured to be electrically connected to the control unit. The mobile X-ray unit of claim 1 or 2, wherein the dosimetry system is configured to recognize a percentage depth dose in the generated X-ray range, and a beam leveling One of beam flatness and a dose rate. The mobile X-ray unit of claim 1 or 2, wherein the dosimetry system is calibrated to obtain an absolute dose ratio of the dose depth ratio. The mobile X-ray unit of claim 1 or 2, wherein the prosthesis comprises one or more dosimeters located at a predetermined location in the prosthesis. A mobile X-ray unit as described in claim 6 of the patent application, The prosthesis is made of a solid material. The mobile X-ray unit of claim 1 or 2, wherein one of the prostheses is provided with an alignment pattern on its surface. The mobile X-ray unit of claim 1 or 2, wherein the dosimetry system is configured to be coupled to a chamber of the X-ray device. The mobile X-ray unit of claim 1 or 2, further comprising an indicator for providing at least a portion of the visual indication of the X-ray beam emitted from the exit window. The mobile X-ray unit of claim 10, wherein the indicator comprises a light source. The mobile X-ray unit of claim 11, wherein the indicator comprises an array of light sources arranged concentrically around the X-ray device. The mobile X-ray unit of claim 12, wherein the X-ray beam has a longitudinal axis, and each of the light sources is configured to emit a narrow beam from a bottom surface of the X-ray device. The predetermined distance is toward the longitudinal axis. The mobile X-ray unit of claim 11, wherein the indicator comprises a light source housed in the X-ray device for generating a beam preset by a collimator ( Intercepted) to provide a light image of one of the X-ray fields emitted from the exit window. The mobile X-ray unit of claim 11, wherein the indicator comprises a light source and an optical fiber configured to provide light from the light source for interception by a collimator. The mobile X-ray unit of claim 13, wherein the indicator comprises a plurality of optical fibers distributed in an area of the X-ray treatment device located above a collimator for illuminating a quasi-alignment The spectrometer opening allows the collimator opening to intercept a range of resulting light. The mobile X-ray unit of claim 11, wherein the indicator comprises a light source, emits a narrow beam, and is disposed inside the X-ray device to define one of the X-ray beams. Vertical axis. The mobile X-ray unit of claim 11, wherein the light source is a light emitting diode or a laser. The mobile X-ray unit of claim 1 or 2, wherein a radiation detector is provided inside the X-ray treatment device for detecting the X-ray beam. The mobile X-ray unit of claim 19, wherein the radiation detector is configured to generate a control signal according to the X-ray beam. The mobile X-ray unit of claim 1 or 2, wherein the prosthesis is humanoid. A dose control method for emitting an X-ray beam from a mobile X-ray unit, the mobile X-ray unit comprising a base for accommodating a control unit and a power supply, and further comprising a An articulating displaceable arm for supporting an X-ray device having an X-ray tube to generate the X-ray The method comprises the steps of providing a prosthesis-based dosimetry system having an equivalent tissue material to identify at least one dose depth dose of the X-ray beam. The method of claim 22, wherein a solid false system provides one or more dosimeters for use.