The present disclosure relates to the technical field of medical equipment, and in particular, to a bowtie filter, a radiation scanning apparatus, and a radiation scanning method.
During tumor scanning on a patient's head or body, in order to reduce a scanning radiation dose and reduce effects of beam hardening and scattering, and improve quality of a scanned image, a bowtie filter is generally disposed between an X-ray source and the patient. Since for different patients, body parts, tumor locations and tumor sizes that need to be scanned are different, different types of bowtie filters are generally needed to be selected to suit the patients.
Currently, one of the most common methods is to manually replace the bowtie filters to ensure that the bowtie filters applied to different patients are capable of meeting the needs of corresponding patients. Of course, in order to improve an efficiency of replacing the bowtie filters, a filter adjustment component may also be used to automatically switch different bowtie filters. For example, different types of bowtie filters are respectively disposed on different sliders of the filter adjustment component. By controlling a movement of each slider on a corresponding guide rail, a bowtie filter suitable for the patient may be kept at a filtering position. However, whether the bowtie filters are manually replaced or automatically switched, different types of bowtie filters are continuously disassembled and assembled or switched according to different scanning needs of the patients, which is cumbersome to operate, and easy to increase a difficulty of radiation scanning and consume a large labor cost. Therefore, it is not conducive to an efficient execution of the radiation scanning.
An objective of the present disclosure is to provide a bowtie filter, a radiation scanning apparatus, and a radiation scanning method, which are used to improve the versatility of the bowtie filter, simplify an operation of the radiation scanning, and improve an operation efficiency of the radiation scanning.
In order to achieve the above objective, the present disclosure provides the following technical solutions.
In a first aspect, the present disclosure provides a bowtie filter, and the bowtie filter includes a filter body, and the filter body includes at least two filter regions. Each of the at least two filter regions is in contact with or partially coincident with an adjacent filter region, and every two adjacent filter regions have different radiation compensation amounts.
In the bowtie filter provided by the present disclosure, at least two filter regions are disposed on a same filter body, and each of the at least two filter regions is in contact with or partially coincident with an adjacent filter region, so that every two adjacent filter regions have different radiation compensation amounts, which may effectively improve the versatility of the bowtie filter, that is, at least two different filtering effects may be achieved with a same bowtie filter, so as to meet at least two different scanning requirements of the users, thereby appropriately reducing a replacement frequency of the bowtie filter. Moreover, a structure of the bowtie filter provided by the present disclosure is simple, and the bowtie filter provided by the present disclosure may be used to perform different degrees of radiation compensation by adjusting an exit angle of a corresponding radiation source, which greatly simplifies an operation of radiation scanning corresponding to different scanning requirements, and is advantageous for reducing an operation difficulty of the radiation scanning, and reducing consumption of labor costs, thereby improving the operation efficiency of the radiation scanning.
Based on the above bowtie filter, in a second aspect, the present disclosure provides a radiation scanning apparatus, and the radiation scanning apparatus includes a radiation source and a bowtie filter. The bowtie filter includes a filter body, and the filter body includes at least two filter regions. Each of the at least two filter regions is in contact with or partially coincident with an adjacent filter region, and every two adjacent filter regions have different radiation compensation amounts. The bowtie filter is disposed at a light outlet side of the radiation source, and each filter region of the bowtie filter corresponds to a different irradiation field of the radiation source.
Based on the radiation scanning apparatus, in a third aspect, the present disclosure provides a radiation scanning method, and the method includes: determining a filter region from filter regions of the bowtie filter as a target filter region according to a scanning requirement of a user; controlling radioactive rays emitted from a radiation source to pass through the target filter region to irradiate a portion to be scanned of the user, an irradiation field of the radiation source corresponding to the target filter region being a target irradiation field; and redetermining another filter region as the target filter region from the filter regions of the bowtie filter in a case where a scanning requirement of a user is changed, and correspondingly switching another irradiation field of the radiation source as the target irradiation field.
The beneficial effects that may be achieved by the radiation scanning apparatus and the radiation scanning method provided by the present disclosure are the same as the beneficial effects of the bowtie filter provided by the above technical solution, which will not be described here again.
In order to further describe the bowtie filter, the radiation scanning apparatus, and the radiation scanning method provided by the embodiments of the present disclosure, a detailed description will be made with reference to the accompanying drawings.
Referring to
The number of filter regions in the filter body 1, a structure and a radiation compensation amount of each filter region may be set according to actual needs. In some embodiments, the filter body includes three filter regions as shown in
It will be noted that the above filter regions are disposed in a same filter body 1 and are used for performing different degrees of radiation compensation for a same radiation source 2, and the filter regions may be sequentially arranged in the filter body 1 along a circumferential direction of the radiation source 2. In order to achieve a seamless switching between adjacent filter regions and effectively improve space utilization of the filter body, sidelines of each filter region and an adjacent filter region, such as the first filter region 11 and the second filter region 12 shown in
In the bowtie filter provided by the embodiments of the present disclosure, at least two filter regions are provided in a same filter body 1, and each of the at least two filter regions is in contact with or partially coincident with an adjacent filter region, so that every two adjacent filter regions have different radiation compensation amounts, which may effectively improve the versatility of the bowtie filter. That is, a same bowtie filter may be used to achieve at least two different filtering effects, so as to meet at least two different scanning requirements of the user, thereby appropriately reducing a replacement frequency of the bowtie filter. Moreover, the structure of the bowtie filter provided by the embodiments of the present disclosure is simple, and the bowtie filter provided by the embodiments of the present disclosure may be used to perform different degrees of radiation compensation by adjusting an exit angle of a corresponding radiation source, which greatly simplifies the operation of radiation scanning corresponding to different scanning requirements, and is advantageous for reducing an operation difficulty of the radiation scanning, and reducing consumption of labor costs, thereby improving the operation efficiency of the radiation scanning.
It will be understood that the radiation scanning that the user needs to perform on a daily basis may be generally divided into two categories: a head scanning and a body scanning. Therefore, in order to ensure high versatility of the bowtie filter, referring to
Optionally, a surface of the first filter region 11 used for facing the radiation source 2 is a first curved surface, a surface of the second filter region 12 used for facing the radiation source 2 is a second curved surface, and a curvature center of the first curved surface and a curvature center of the second curved surface are in a same straight line or coincident. For example, radioactive rays emitted from the radiation source directly irradiate the filter body 1, and the curvature center of the first curved surface and the curvature center of the second curved surface are in a same straight line or coincident with a light source center of the radiation source. In addition, if the filter body 1 is further provided with a third filter region 13, similarly, a surface of the third filter region 13 used for facing the radiation source 2 is a third curved surface, and a curvature center of the third curved surface and the curvature center of the first curved surface are in a same straight line or coincident.
In some embodiments, referring to
In some other embodiments, referring to
In some embodiments, referring to
It is worth mentioning that, in the above embodiment, the first filter region 11 is used for radiation compensation of the head to be scanned, and the second filter region 12 is used for radiation compensation of the body to be scanned. In a case where the first curved surface of the first filter region 11 and the second curved surface of the second filter region 12 have the same curvature ρ, curvature of the curved surface required for the radiation compensation of the head to be scanned is a head applicable curvature ρt1, and curvature of the curved surface required for the radiation compensation of the body to be scanned is a body applicable curvature ρt2. Since the head applicable curvature ρt1 is generally greater than the body applicable curvature ρt2, the curvature ρ of the first curved surface and the second curved surface may generally be selected between the head applicable curvature ρt1 and the body applicable curvature ρt2. That is, ρt2 is less than ρ, and ρ is less than ρt1. In addition, in order to reduce a design difficulty of the bowtie filter and facilitate the fabrication, it is also acceptable to adopt the body applicable curvature ρt2 as the above curvature ρ of the first curved surface and the second curved surface.
In order to evenly distribute the filter regions having different radiation compensation amounts, referring to
It will be noted that the bowtie filter in the above embodiment is used for radiation compensation, and the filter body is generally made of material with good radiation attenuation properties. For example, the above filter body 1 includes an aluminum filter body, a ceramic filter body or a teflon filter body, that is, the filter body 1 may be made of aluminum metal, ceramic material or polytetrafluoroethylene (PTFE) material.
In addition, the above filter body 1 may also be composed of a light-transmitting substrate and heavy metal compound particles 3 doped in the light-transmitting substrate. The light-transmitting substrate allows visible light to pass through, and is generally made of transparent or translucent material such as glass or light-transmitting resin and the like. The heavy metal compound generally has high radiation attenuation properties. In the embodiment of the present disclosure, the heavy metal compound particles are doped in the light-transmitting substrate, and the radioactive rays emitted from the radiation source may be compensated for a certain amount by using the heavy metal compound particles having a certain density. Optionally, the above heavy metal compounds include a compound of at least one metal element of lead, chromium, tin, nickel, cobalt, antimony, cadmium, or bismuth. For example, the above filter body adopts a glass filter body doped with heavy metal compound particles. The glass filter body is lead glass, and the heavy metal compound particles included therein are lead oxide particles.
It will be added that in a case where the filter body 1 is composed of the light-transmitting substrate and the heavy metal compound particles doped in the light-transmitting substrate, each filter region may be formed by shaping the heavy metal compound particles in a corresponding region in the light-transmitting substrate. That is to say, a shape of each filter region is related to a distribution shape of the heavy metal compound particles. Optionally, the glass filter body is formed by fitting the shapes of the filter regions, such as the bow column shown in
It will be understood that the above bowtie filter is generally fixedly installed on a base of an accessory of the radiation source, and the radioactive rays emitted from the radiation source generally refer to X-rays or y-rays or the like for scanning lesion portions of the patient. The radioactive rays are invisible light. Therefore, in order to accurately verify the radiation field of the radiation source corresponding to each filter region, it is generally necessary to use a light field lamp to perform an optical path simulation of the radiation source. Since light emitted from the light field lamp is generally visible light, and the bowtie filter in the embodiments of the present disclosure adopts a filter body composed of the light-transmitting substrate and the heavy metal compound particles doped in the light-transmitting substrate, a light-transmitting property of the light-transmitting substrate for visible light may be utilized to perform an optical path simulation of the light field lamp without disassembling the bowtie filter, thereby facilitating a verification operation of the radiation field of the radiation source.
Based on the above bowtie filter, the embodiments of the present disclosure further provide a radiation scanning apparatus. Referring to
In a case where the radiation scanning apparatus provided in the above embodiment is used, referring to
In step S1, a target filter region is determined from filter regions of the bowtie filter according to a scanning requirement of the user.
For example, referring to
In step S2, the radioactive rays emitted from a radiation source are controlled to pass through the target filter region to irradiate a portion to be scanned of the user, and an irradiation field of the radiation source corresponding to the target filter region is a target irradiation field.
With continued reference to
In step S3, another filter region is redetermined as the target filter region from the filter regions of the bowtie filter in a case where the scanning requirement of the user is changed, and another irradiation field of the radiation source is correspondingly switched as the target irradiation field.
With continued reference to
It will be noted that, ranges of regions covered by the head irradiation field A and the body irradiation field B respectively may be specifically determined according to the actual needs of the user's head scanning or body scanning. For example, referring to
The beneficial effects that may be achieved by the radiation scanning apparatus and the radiation scanning method provided by the embodiments of the present disclosure are the same as the beneficial effects of the bowtie filter provided by the above embodiments, which will not be described here again.
The foregoing descriptions are merely specific implementation manners of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can readily conceive of changes or replacements within the technical scope of the present disclosure should all be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.
This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2018/115269 filed on 13 Nov. 2018, which is incorporated herein by reference in its entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2018/115269 | 11/13/2018 | WO | 00 |