Film holder and film for measuring radiation / mechanical central axis and dose distribution

Abstract

Disclosed is a film holder for measuring a radiation / mechanical central axis and a dose distribution. The film holder for measuring the radiation / mechanical central axis and the dose distribution comprises: a polygonal frame fixed to a frame holder to which a stereotactic frame is fixed during stereotactic surgery; and a gamma knife accuracy measurement film holder having a columnar shape and having one end assembled to the center of the polygonal frame so that the longitudinal direction of the columnar shape is perpendicular to one surface of the polygonal frame.

Description

Film holder and film for radiation / mechanical center axis and dose distribution measurement

[0001] The present invention relates to a film holder and a film for measuring a radiation / mechanical center axis and dose distribution, and more particularly, to a film holder and a film for measuring a radiation / mechanical center axis and dose distribution that can reduce errors in measured values ​​for dose distribution even when the measurers are different.

[0002] Gamma Knife radiosurgery delivers high doses of radiation in a single session. The surgical procedure consists of four steps: stereotactic fixation, image acquisition, treatment planning, and radiation delivery. The treatment process is typically completed in one day. Because it delivers a single, high dose of radiation, patient safety and maintaining a precise treatment system during preparation and treatment are paramount. Therefore, regular quality control is essential to ensure accurate treatment planning and the maintenance of a precise treatment system.

[0003] Film analysis is typically used to measure the accuracy (radiation / mechanical centering and dose distribution) of a Gamma Knife.

[0004] The accuracy measurement method using film analysis is to mark a central axis on the film and irradiate radiation toward the central axis, which will result in a dose distribution on the film, and measure the full width at half maximum (FWHM) for the dose distribution on each of the X, Y, and Z axes. However, since there is no precise reference point for the X and Y axes, the FWHM measurement results for the X and Y axes differ for each measurer. In other words, since the inclination or angle of the X and Y axes on the film set for the FWHM measurement may differ for each measurer, it has been difficult to obtain accurate measurement data at all times.

[0005] Therefore, the problem to be solved by the present invention is to provide a film holder and film for measuring a radiation / mechanical center axis and dose distribution, which can significantly reduce the error in the measured value for the dose distribution even if the measurer is different, and further improve the reliability of the radiation / mechanical center axis and dose distribution measurement results.

[0006] According to one embodiment of the present invention, a film holder for measuring a radiation / mechanical center axis and dose distribution comprises: a polygonal frame fixed to a frame holder to which a stereotactic frame is fixed during stereotactic surgery; and a gamma knife accuracy measurement film holder having a columnar shape and one end assembled at the center of the polygonal frame such that the longitudinal direction of the columnar shape is perpendicular to one surface of the polygonal frame, wherein the gamma knife accuracy measurement film holder comprises: a horizontal plane extending a predetermined length along the longitudinal direction of the columnar shape at a predetermined height within a distance between an outer surface and a center of the columnar shape; a film mounting groove formed on the horizontal plane and on which a gamma knife accuracy measurement film is mounted; a film fixing cover formed with a horizontal cover surface parallel to the horizontal plane, the cover surface covering the horizontal plane and assembled to the horizontal plane; a center point marking means provided at the center of a region of the cover surface facing the film mounting groove or at the center of the film mounting groove to mark a center point on a measurement film within the film mounting groove when the film fixing cover is assembled; And it includes a reference point display means for displaying four reference points on the measuring film, each positioned on both sides of a virtual first line segment parallel to the Z-axis parallel to the longitudinal direction of the holder and passing through the center point, and a virtual second line segment parallel to the X-axis or Y-axis perpendicular to the Z-axis and passing through the center point, which is provided around the center of the area facing the film mounting groove of the cover surface or around the center of the film mounting groove.

[0007] In one embodiment, the center point indicating means may be a button-type push pin that is provided to penetrate perpendicularly to the length direction of the film fixing cover and is pressed in a button-like manner to press the film seated in the film seating groove.

[0008] In one embodiment, the center point indicating means may be a pressure pin that protrudes from the cover surface of the film fixing cover or the film fixing groove and presses the measuring film when the film fixing cover is assembled.

[0009] In one embodiment, the reference point indicating means may be four pressure pins that protrude from the cover surface or the film fixing groove and press the measuring film when the film fixing cover is assembled.

[0010] In one embodiment, the reference point indicating means may be four through holes penetrating from the outer surface of the film fixing cover to the cover surface.

[0011] In one embodiment, the reference point indicating means may be four through holes penetrating from the outer surface of the holder into the film mounting groove.

[0012] A film for measuring a radiation / mechanical center axis and dose distribution according to one embodiment of the present invention is a film for measuring a radiation / mechanical center axis and dose distribution accommodated in a film holder, comprising: a center point formed by the film holder; and four reference points positioned respectively in both directions of a virtual first line segment parallel to a Z-axis parallel to a longitudinal direction of the holder and passing through the center point, and a virtual second line segment parallel to an X-axis or a Y-axis perpendicular to the Z-axis and passing through the center point.

[0013] According to the film holder and film for measuring the radiation / mechanical center axis and dose distribution of the present invention, when different measurers measure the radiation dose distribution, the selection criteria for the X and Y axes can be applied in the same manner, so that even if the measurers are different, the error in the measured value for the dose distribution can be significantly reduced, and furthermore, there is an advantage in that the reliability of the radiation / mechanical center axis and dose distribution measurement results can be improved.

[0014] FIG. 1 is an exploded perspective view illustrating a film holder for measuring a radiation / mechanical center axis and dose distribution according to one embodiment of the present invention.

[0015] FIGS. 2 to 5 are drawings for explaining a process of marking a center point and four reference points on a measurement film and irradiating radiation using a film holder for measuring a radiation / mechanical center axis and dose distribution according to one embodiment of the present invention.

[0016] Hereinafter, with reference to the attached drawings, a film holder for measuring a radiation / mechanical center axis and dose distribution according to an embodiment of the present invention will be described in detail. The present invention can be modified in various ways and can take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, but it should be understood that the invention includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing each drawing, similar reference numerals are used to refer to similar components. In the attached drawings, the dimensions of structures are shown larger than actual size to ensure clarity of the present invention.

[0017] While terms like "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0018] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0019] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0020] FIG. 1 is a perspective view illustrating a film holder for measuring a radiation / mechanical center axis and dose distribution according to one embodiment of the present invention.

[0021] Referring to FIG. 1, a film holder according to one embodiment of the present invention includes a polygonal frame (100) and a gamma knife accuracy measurement film holder (200).

[0022] The polygonal frame (100) can be fixed to a holder to which the stereotactic frame is fixed during stereotactic surgery. For example, the polygonal frame (100) can include an octagonal annular frame portion (110), a plurality of diagonal frame portions (120) extending from the inner four corners of the annular frame portion (110) toward the center of the annular frame portion (110), and a holder assembly frame portion (130) connected to the ends of the diagonal frame portions (120) and formed at the center of the annular frame portion (110).

[0023] The gamma knife accuracy measurement film holder (200) may be provided in a columnar shape and may include a coupling shaft (260) assembled to the holder assembly frame (130) at one end. For example, the gamma knife accuracy measurement film holder (200) may have a circular columnar shape.

[0024] Meanwhile, the gamma knife accuracy measurement film holder (200) may include a horizontal surface (210), a film mounting groove (220), a film fixing cover (230), a center point indicating means (240), and a reference point indicating means (250).

[0025] The horizontal plane (210) may extend along the longitudinal direction of the columnar shape at a predetermined height within the distance between the outer surface and the center of the columnar shape of the gamma knife accuracy measurement film holder (200). That is, when the longitudinal end of the horizontal plane (210) is viewed from the front, the horizontal plane (210) may be formed at a height lower than the outer surface of the holder (200) by being stepped from the outer surface of the holder (200).

[0026] A film mounting groove (220) is formed on a horizontal surface (210), and a gamma knife accuracy measurement film (310, 320) can be mounted thereon. For example, the film mounting groove (220) can be formed as a square groove with one corner chamfered.

[0027] The film fixing cover (230) is formed with a horizontal cover surface (231) that is parallel to the horizontal plane (210), and can be assembled to the horizontal plane (210) while the cover surface (231) covers the horizontal plane (210). When the film fixing cover (230) is assembled to the horizontal plane (210), it can form a completed cylindrical shape of the holder (200). For example, the film fixing cover (230) can be joined through a tightening screw (270) that is joined to a portion of the horizontal plane (210) that is outside the film fixing groove (220).

[0028] The center point indicating means (240) is provided at the center of the area facing the film mounting groove (220) of the cover surface (231) or at the center of the film mounting groove (220), so that the center point can be indicated on the measuring film (310, 320) within the film mounting groove (220) when the film fixing cover (230) is assembled.

[0029] The reference point marking means (250) is provided around the center of the area facing the film mounting groove (220) of the cover surface (231) or around the center of the film mounting groove (220), and can mark four reference points on the measuring film (310, 320) located on both sides of each of a virtual first line segment (a) that is parallel to the Z-axis that is parallel to the longitudinal direction of the holder (200) and passes through the center point and a virtual second line segment (b) that is parallel to the X-axis or Y-axis that is perpendicular to the Z-axis and passes through the center point.

[0030] In one embodiment, the center point indicating means (240) may be a first pressure pin (241) that protrudes from the cover surface or film fixing groove (220) of the film fixing cover and presses the measuring film (310, 320) when the film fixing cover (230) is assembled, and the reference point indicating means (250) may be four second pressure pins (251) that protrude from the cover surface (231) or film fixing groove (220) and presses the measuring film (310, 320) when the film fixing cover (230) is assembled. For example, the first pressure pin (241) and the four second pressure pins (251) may protrude from the cover surface (231).

[0031] Hereinafter, a process of marking a center point and four reference points on a measurement film (310, 320) and irradiating radiation using a film holder for measuring a radiation / mechanical center axis and dose distribution according to one embodiment of the present invention will be described.

[0032] First, a measuring film (310, 320) for XZ plane measurement and a measuring film (310, 320) for YZ plane measurement are prepared. For convenience of explanation, the measuring film (310, 320) for XZ plane measurement is referred to as 'XZ measuring film', and the measuring film (310, 320) for YZ plane measurement is referred to as 'YZ measuring film (320)'.

[0033] The polygonal frame (100) is fixed to a frame holder (not shown) to which the stereotactic frame is fixed during stereotactic surgery, and the gamma knife accuracy measurement film holder (200) is coupled to the polygonal frame (100) so that the horizontal plane (210) of the gamma knife accuracy measurement film holder (200) is parallel to the plane on which the frame holder is positioned, so that the horizontal plane (210) and the bottom surface of the film mounting groove (220) are placed on the XZ plane, as shown in FIG. 2.

[0034] Next, after separating the film fixing cover (230) from the horizontal plane (210), the XZ measuring film (310) is inserted into the film fixing groove (220), and then the film fixing cover (230) is coupled to the horizontal plane (210). At this time, when the fastening screw (270) is tightened to fix the film fixing cover (230), the first pressure pin (241) protruding from the cover surface (231) of the film fixing cover (230) marks the center point (311) at the center of the XZ measuring film (310), and the second pressure pin (251) protruding from the cover surface (231) marks four reference points (312) on the XZ measuring film (310).

[0035] As shown in Fig. 4, with the center point (311) and four reference points (312) marked on the XZ measuring film (310), radiation is irradiated toward the center point (311) of the XZ measuring film (310) in the XZ plane.

[0036] Next, the film fixing cover (230) is separated from the horizontal surface (210) and the XZ measuring film (310) inside the film fixing groove (220) is removed.

[0037] Next, as shown in Fig. 3, the gamma knife accuracy measurement film holder (200) is attached to the polygonal frame (100) so that the horizontal plane (210) and the film mounting groove (220) are placed on the YZ plane perpendicular to the XZ plane.

[0038] Next, after inserting the YZ measuring film (320) into the film fixing groove (220), the film fixing cover (230) is attached to the horizontal plane (210) to mark the center point (321) at the center of the YZ measuring film (320), and mark four reference points (322) on the YZ measuring film (320). This process is the same as forming the center point (312) and four reference points (312) on the XZ measuring film (310) described above.

[0039] As shown in Fig. 5, with the center point (321) and four reference points (322) marked on the YZ measuring film (320), radiation is irradiated toward the center point (321) of the YZ measuring film (320) in the YZ plane.

[0040] Meanwhile, the center points (311, 321) of the XZ measuring film (310) and YZ measuring film (320) irradiated with radiation become mechanical center axes, and the dose distribution of radiation appears at each center point, and the dose distribution of each measuring film (310, 320) and the half width of the X, Y, and Z axes for the dose distribution are measured using a measuring device. For example, the measuring device may be a scanner and a scan analysis program.

[0041] Meanwhile, before measuring the half-width for the dose distribution, an X-axis parallel reference line (a) and a Y-axis parallel reference line (b) can be indicated through four reference points (312, 322) indicated on each measurement film (310, 320) as shown in FIGS. 4 and 5. That is, in the XZ measurement film (310), an X-axis parallel reference line (a) can be indicated by drawing a line segment passing through the center point with two reference points located in both directions of the X-axis among the four reference points as the start and end, and in the YZ measurement film (320), a Y-axis parallel reference line (b) can be indicated by drawing a line segment passing through the center point with two reference points located in both directions of the Y-axis among the four reference points as the start and end.

[0042] This X-axis parallel reference line (a) serves as a measurement standard for the half-width of the X-axis when measuring the half-width for the dose distribution on the XZ measuring film (310), and the Y-axis parallel reference line (b) serves as a measurement standard for the half-width of the Y-axis when measuring the half-width for the dose distribution on the YZ measuring film (320). Therefore, the measurement standard for the half-width for the same X-axis and Y-axis dose distribution can be equally applied to each measurer who measures the half-width of the dose distribution.

[0043] According to one embodiment of the present invention, the film holder for measuring the radiation / mechanical center axis and dose distribution has the advantage that the selection criteria for the X and Y axes can be applied equally when different measurers measure the radiation dose distribution, so that even if the measurers are different, the error in the measured value for the dose distribution can be significantly reduced, and further, the reliability of the radiation / mechanical center axis and dose distribution measurement results can be improved.

[0044] FIG. 6 is a drawing for explaining a film holder for measuring a radiation / mechanical center axis and dose distribution according to another embodiment of the present invention.

[0045] Referring to FIG. 6, the center point indicating means (240) of the film holder for measuring the radiation / mechanical center axis and dose distribution according to another embodiment of the present invention may be a button-type pressing pin (242) that penetrates vertically in the longitudinal direction of the film fixing cover (230) and presses the measuring film (310, 320) seated in the film seating groove (220) by being pressed in a button-type manner.

[0046] In addition, the reference point marking means (250) may be four through holes (252) penetrating from the outer surface of the film fixing cover (230) to the cover surface (231). In this case, when it is desired to mark four reference points on the measuring film (310, 320) inserted into the film mounting groove (220), a pen or pin may be inserted into each of the four through holes (252) to mark four reference points on the measuring film (310, 320) inserted into the film mounting groove (220).

[0047] The film holder for measuring the radiation / mechanical center axis and dose distribution according to another embodiment of the present invention has the same configuration, operation, and effect as the film holder for measuring the radiation / mechanical center axis and dose distribution according to one embodiment of the present invention, except that the structure of the center point indicating means (240) and the reference point indicating means (250) are different, so a more detailed description will be omitted.

[0048] The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments disclosed herein, but is to be construed in the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polygonal frame fixed to a frame holder to which a stereotactic frame is fixed during stereotactic surgery; and It includes a gamma knife accuracy measurement film holder having a column shape and one end assembled at the center of the polygonal frame such that the longitudinal direction of the column shape is perpendicular to one side of the polygonal frame. The above Gamma Knife accuracy measurement film holder is, A horizontal plane extending a certain length along the longitudinal direction of the column shape at a certain height within the distance between the outer surface and the center of the column shape; A film mounting groove formed on the above horizontal surface and in which a gamma knife accuracy measurement film is mounted; A film fixing cover having a horizontal cover surface parallel to the horizontal surface and assembled to the horizontal surface while covering the horizontal surface; A center point marking means provided at the center of the area facing the film fixing groove of the cover surface or at the center of the film fixing groove to mark the center point on the measuring film within the film fixing groove when the film fixing cover is assembled; and A reference point display means is provided around the center of the area facing the film mounting groove of the cover surface or around the center of the film mounting groove, and displays four reference points on the measuring film, each of which is positioned in both directions of a virtual first line segment parallel to the Z-axis parallel to the longitudinal direction of the holder and passing through the center point, and a virtual second line segment parallel to the X-axis or Y-axis perpendicular to the Z-axis and passing through the center point. Film holder for radiation / mechanical center axis and dose distribution measurements.

2. In paragraph 1, The above center point indicating means is characterized in that it is a button-type pressing pin that is provided to penetrate perpendicularly to the length direction of the film fixing cover and is pressed in a button-type manner to press the film seated in the film seating groove. Film holder for radiation / mechanical center axis and dose distribution measurements.

3. In paragraph 1, The above center point indicating means is a pressure pin that protrudes from the cover surface of the film fixing cover or the film fixing groove and presses the measuring film when the film fixing cover is assembled. Film holder for radiation / mechanical center axis and dose distribution measurements.

4. In paragraph 1, The above reference point indicating means are four pressure pins that protrude from the cover surface or the film fixing groove and press the measuring film when the film fixing cover is assembled. Film holder for radiation / mechanical center axis and dose distribution measurements.

5. In paragraph 1, The above reference point indicating means are four through holes penetrating from the outer surface of the film fixing cover to the cover surface. Film holder for radiation / mechanical center axis and dose distribution measurements.

6. In paragraph 1, The above reference point indicating means are four through holes that penetrate from the outer surface of the holder to the film mounting groove. Film holder for radiation / mechanical center axis and dose distribution measurements.

7. A film for measuring the radiation / mechanical center axis and dose distribution accommodated in the film holder of paragraph 1, formed by the above film holder, center point; and Including four reference points located on both sides of each of an imaginary first line segment parallel to the Z-axis parallel to the longitudinal direction of the holder and passing through the center point and an imaginary second line segment parallel to the X-axis or Y-axis perpendicular to the Z-axis and passing through the center point, Film for measuring radiation / mechanical center axis and dose distribution.

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