KR101794444B1 - Pelvic phantom - Google Patents

Abstract

The pelvic phantom according to the present invention includes a phantom unit having a shape corresponding to an anatomical structure of the human pelvis and a measurement unit for measuring a radiation dose for the phantom unit, ) Number. According to this configuration, it becomes possible to predict an accurate dose of radiation to the pelvis of the patient, and it is possible to improve the reliability of the patient according to the improvement of the treatment accuracy.

Description

Pelvic phantom {PELVIC PHANTOM}

The present invention relates to a pelvic phantom, and more particularly, to a pelvic phantom capable of improving the accuracy of predicting a radiation dose for a patient's pelvis.

Remote radiotherapy and brachytherapy are common methods of radiation therapy for cancer patients. Here, the remote radiotherapy is a treatment for removing cancer cells by irradiating the patient with radiation from the outside of the patient using a radiation generator, and the proximity radiotherapy is a method of inserting a radioisotope into the body's internal part, It is a treatment to remove cancer cells.

On the other hand, the proximity radiotherapy has the advantage of excellent clinical effect by directly irradiating the treatment site with radiation, but has a problem due to unnecessary radiation coating when the radiation is irradiated to a nearby site rather than the affected site. Accordingly, the proximity radiotherapy requires dose control together with precise positional irradiation.

Quality control for the treatment of near - field radiation is generally performed visually by measuring point doses using a well - type chamber and by measuring the distribution of non - standardized doses using a radiation sensitive film. It is difficult to predict the change in the quality of the radiation as it passes through the inhomogeneity of the body, as the anatomical structure of the human body is not considered.

In addition, location and volume changes of pelvic organs such as rectum and bladder in all radiotherapy including brachytherapy are very important factors for dose distribution, but precise dose prediction is difficult due to structural features. Therefore, there is a need for a method for confirming the actual quality control of the proximal radiotherapy and the change in the dose distribution due to the location and size of the organs in the pelvis.

Korean Patent No. 10-1478402 Korean Patent No. 10-0613244

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pelvic phantom capable of improving treatment accuracy through accurate prediction of a radiation dose to the pelvis.

To achieve the above object, a pelvic phantom includes a phantom unit having a shape corresponding to an anatomical structure of the human pelvis, and a measurement unit for measuring a dose of radiation to the phantom unit, CT (Computed Tomography) number.

According to one aspect of the present invention, the phantom unit includes a first phantom part corresponding to the external shape of the human body and formed of a silicone material, a second phantom part corresponding to the bones of the human body in the first phantom part, And a third phantom portion having a shape corresponding to an organ of the human body and formed of a silicon material in the first phantom portion.

According to one aspect of the present invention, the third phantom part is provided with an insertion port for communicating the inside and the outside, and the measurement unit can be inserted through the insertion port.

According to one aspect, the third phantom part includes a bladder phantom, a uterine phantom, a vaginal phantom, and a rectal phantom having a shape corresponding to the bladder, uterus, vagina, and rectum of the human body. The bladder phantom, the uterine phantom, The workplace phantom can change volume.

According to one aspect, the measurement unit includes a dose meter inserted into the phantom unit for measuring a radiation dose, a pair of support plates for supporting the dose meter, and a clip for fixing the pair of support plates to each other And the dosimeter includes at least one of a metal oxide field effect transistor (MOSFET) dosimeter, an OSLD (Optically Stimulated Luminescence Dosimeter) dosimeter, a TLD (Thermoluminescence Dosimeter) dosimeter, and a glass dosimeter.

According to one aspect, the measurement unit is inserted into the uterine direction from the hip region of the phantom unit to measure the dose of radiation.

According to one aspect of the present invention, the measurement unit includes a bar-shaped measurement unit that can be inserted into the bladder phantom, vaginal phantom, and rectal phantom through an insertion port communicating the inside and the outside of the bladder phantom, the vaginal phantom, and the rectal phantom, A dosimeter is provided for.

According to one aspect, the phantom unit is capable of CT (Computed Tomography), MRI (Magnetic Resonance Imaging), PET (Positron Emission Tomography), or ultrasound imaging.

A pelvic phantom according to a preferred embodiment of the present invention includes a phantom unit having a shape corresponding to an anatomical structure of the human pelvis and formed of a material similar to a CT (Computed Tomography) number corresponding to the human body, And a measurement unit inserted into the phantom unit for measuring the dose of radiation to the phantom unit.

According to one aspect of the present invention, a plurality of long term phantoms corresponding to organs of the human body are provided in the inside of the phantom unit, and the plurality of long term phantoms are each connected to the outside to change volume.

According to one aspect of the present invention, the phantom unit includes a first phantom part corresponding to the external shape of the human body and formed of a silicone material, a second phantom part corresponding to the bones of the human body in the first phantom part, And a third phantom portion having a shape corresponding to an organ of the human body and formed of a silicon material in the first phantom portion.

According to one aspect of the present invention, the third phantom part is provided with an insertion port for communicating the inside and the outside, and the measurement unit can be inserted through the insertion port.

According to one aspect, the measurement unit includes a dose meter inserted into the phantom unit to measure a dose of radiation, and the dose meter includes a metal oxide field effect transistor (MOSFET) dosimeter, an OSLD (Optically Stimulated Luminescence Dosimeter) (Thermoluminescence Dosimeter) dosimeter and a glass dosimeter.

According to one aspect, the phantom unit is capable of CT (Computed Tomography), MRI (Magnetic Resonance Imaging), PET (Positron Emission Tomography), or ultrasound imaging.

According to the present invention having the above-described configuration, firstly, it is possible to accurately reproduce the actual patient's pelvis, and realistic treatment simulation becomes possible.

Second, it is possible to improve the precision of calculation of the radiation dose in the treatment plan for the pelvic area of the patient, thereby contributing to the improvement of the reliability of the patient according to the improvement of the treatment precision.

Third, the change of dose distribution according to the position and size of organs in the pelvis can be measured, which is advantageous for quality control of radiotherapy.

1 is a perspective view schematically showing a phantom unit of a pelvis phantom according to a preferred embodiment of the present invention,
FIG. 2 is a perspective view schematically showing the third phantom portion shown in FIG. 1,
3 is a perspective view schematically showing a first measuring unit of a measurement unit of a pelvis phantom according to a preferred embodiment of the present invention,
FIG. 4 is a side view and a plan view schematically showing the first measuring unit shown in FIG. 3,
5 is a perspective view schematically showing a second measuring unit of the measuring unit according to the preferred embodiment of the present invention,
Fig. 6 is a side view and a plan view schematically showing the second measuring unit shown in Fig. 5,
7 is a perspective view schematically showing a third measuring unit of the measuring unit according to the preferred embodiment of the present invention,
FIG. 8 is a side view and a plan view schematically showing the third measuring unit shown in FIG. 7,
FIG. 9 is a perspective view schematically showing a fourth measuring unit according to a preferred embodiment of the present invention, FIG.
FIG. 10 is a side view and a plan view schematically showing the fourth measuring unit shown in FIG. 9;
11 is a perspective view schematically showing a fifth measuring unit of the measuring unit according to a preferred embodiment of the present invention,
FIG. 12 is a perspective view schematically showing a modification of the phantom unit of the pelvis phantom shown in FIG. 1; FIG.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 3, a pelvic phantom 1 according to a preferred embodiment of the present invention includes a phantom unit 10 and a measurement unit 20.

For reference, the pelvic phantom 1 described in the present invention is a device for measuring a dose of a near-field radiation used for measuring the dose of radiation for the purpose of managing the degree of brachytherapy radiation treatment.

The phantom unit 10 has a shape corresponding to an anatomical structure of the human pelvis and is formed of a material similar to a CT (Computed Tomography) number corresponding to a human body. The phantom unit 10 includes a first phantom part 11, a second phantom part 12, and a third phantom part 13.

The first phantom part 11 has a shape corresponding to the external shape of the human pelvis. The first phantom part 11 is formed of a silicone material similar to the human body, which is similar in CT number to the actual patient's tissue.

The second phantom part 12 is provided in the first phantom part 11 in a shape corresponding to the bones of the human body. The second phantom part 12 is formed of a urethane material having a CT number similar to that of an actual patient's bone tissue. When the pelvic phantom 1 is photographed by CT, the second phantom part 12 reproduces the bone shape corresponding to the second phantom part 12 with the same brightness as the actual patient, thereby improving the accuracy of calculating the dose .

The third phantom part 13 has a shape corresponding to an organ of a human body and is provided inside the first phantom part 11. [

The third phantom part 13 has a shape corresponding to the bladder, the uterus, the vagina, the rectum and the like. 2, the third phantom portion 13 includes a bladder phantom 14, a uterus phantom 15, a vaginal phantom 16, and a rectal phantom 17, as shown in Fig. do. The bladder phantom 14, the uterine phantom 15, the vaginal phantom 16 and the rectal phantom 17 of the third phantom part 13 are also formed of a material having a CT number similar to a human body, It may be formed of a silicon material as in the first embodiment.

The bladder phantom 14, the uterus phantom 15, the vaginal phantom 16, and the rectal phantom 17 are all capable of volume change, so that an environment similar to organs of a human body can be formed. Particularly, the bladder phantom 14 is manufactured such that a volume change is possible by connecting a hose (not shown) having a small diameter to the outside and injecting a fluid such as water.

The third phantom unit 13 improves the recall rate for the organs inside the pelvis of the human body, and enables realistic simulations in the case of close treatment for an actual patient.

The measurement unit (20) measures the dose of radiation to the phantom unit (10). More specifically, the measurement unit 20 is inserted into the interior of the phantom unit 10 to measure the dose of near-field radiation to the phantom unit 10.

3 to 11, the measurement unit 20 includes the first to fifth measurement units 30, 40, 50, 60, and 70, and the phantom unit 10, As shown in FIG. 3 to 11, a plurality of first to fifth measuring units 30, 40 and 50 (not shown) are provided in the phantom unit 10, (60) and (70) is inserted to measure the near-field dose to the pelvis phantom (1).

At this time, an unillustrated insertion port provided in the phantom unit 10 is positioned in the direction of the uterine phantom 15 of the third phantom part 13 from the hip of the first phantom part 11, As shown in FIG.

First, the first measuring unit 30 of the measuring unit 20 shown in FIGS. 3 and 4 includes a MOSFET (Metal Oxide Field Effect Transistor) dosimeter 31. A plurality of MOSFET dose meters 31 are provided between a pair of first support plates 32 and the pair of first support plates 32 are fixed to each other by a first clip 33. At this time, the MOSFET dosimeter 31 has a shape extending in the longitudinal direction, and is arranged to be parallel to each other in the width direction. In this embodiment, the plurality of MOSFET dosimeters 31 are arranged in two rows with different lengths, but the present invention is not limited thereto.

The MOSFET dosimeter 31 measures a change in the voltage of the MOSFET dosimeter 31 according to a change in resistance and measures the absorbed dose of radiation using a characteristic that the resistance changes when the radiation is absorbed. The MOSFET dosimeter 31 is made of a silicon material and has regenerable characteristics.

The second measuring unit 40 includes an OSLD (Optically Stimulated Luminescence Dosimeter) dosimeter 41 as shown in FIGS. Like the first measuring unit 30, the OSLD dosimeter 41 is provided between a pair of second support plates 42, and a plurality of OSLD dosimeters 41 are provided so as to be parallel to each other. At this time, the pair of second support plates 42 are fixed in mutually engaged state by the second clip 43.

The OSLD dosimeter 41 has a plurality of OSLD dosimeters 41 spaced apart from each other in the longitudinal direction. The OSLD dosimeter 41 is a light emission luminescent dosimeter for measuring a radiation dose using a characteristic of emitting light in proportion to a coated dose.

7 and 8, the third measuring unit 50 includes a TLD (Thermoluminescence Dosimeter) dosimeter 51, a pair of third supporting plates 52 for supporting the TLD dosimeter 51, And a third clip 53 for fixing the three support plates 52 to each other. Since the third support 53 plate 52 and the third clip 53 are similar to the first and second measurement units 30 and 40, detailed description will be omitted.

The TLD dosimeter 51 has a characteristic of a thermal fluorescence dosimeter that is proportional to the amount of radiation absorbed by the amount of emitted light generated after the absorption of the fluorescent material and is composed of calcium fluoride (CaF2), lithium fluoride (LiF), calcium sulfate CaSO4), and an oxidized berry room (BeO). The TLD dosimeter 51 has a square shape having a smaller size than the OSLD dosimeter 41 described above. In addition, five of the third support plates 52 are arranged side by side so as to be spaced apart from each other in the longitudinal direction. It is needless to say that the shape, size and number of such TLD dosimeters 51 are not limited to the illustrated examples.

The fourth measuring unit 60 includes a glass dosimeter 61 as shown in Figs. 9 and 10. The glass dosimeter 61 is also provided between the pair of fourth support plates 62 and fixed in a posture in the same manner as the first to third measurement portions 30, The fourth support plate 62 is fixed to each other by the fourth clip 63.

A plurality of the glass dosimeters 61 are arranged in parallel to each other so as to be spaced apart in the longitudinal direction of the fourth support plate 62. In the present embodiment, six glass dosimeters are illustrated. Further, the glass dosimeter 61 is formed of silver or cobalt glass, and has a substantially cylindrical shape.

For reference, the first to fourth supporting plates 32, 42, 52, and 62 of the first to fourth measuring units 30, 40, 50, and 60 described above interfere with the radiation dose measurement Such as acrylic, and has a substantially rectangular plate shape.

11, the fifth measuring unit 70 of the measuring unit 20 is shown. The fifth measuring unit 70 has a bar shape that can be inserted into the phantom unit 10 through the bladder phantom 14, vaginal phantom 16 and rectal phantom 17 shown in Fig. That is, the fifth measuring unit 70 may be configured to communicate the inside and outside of the bladder phantom 14, the vaginal phantom 16, and the rectal phantom 17, not the insertion port (not shown) separately provided in the phantom unit 10 Is inserted through an insertion port (not shown), and a radiation dose is measured.

The fifth measuring unit 70 includes first to third insertion rods 71, 73 and 75 and first and second insertion rods 71, 73 and 75, 74, and 76 provided in the first to third dose meters 72, 74, and 76, respectively.

The first to third insertion rods 71, 73 and 75 are inserted into insertion ports (not shown) communicating the bladder phantom 14, the vaginal phantom 16, and the rectal phantom 17 internally and externally. The first through third insertion rods 71, 73 and 75 are arranged in the same manner as the first through fourth support plates 32, 42, 52 and 62, And has a substantially rectangular plate shape.

The first to third dosimeters 72, 74 and 76 provided in the first through third insertion rods 71, 73 and 75 are connected to the above-described MOSFET (Metal Oxide Field Effect Transistor) An OSLD (Optically Stimulated Luminescence Dosimeter) dosimeter, a TLD (Thermoluminescence Dosimeter) dosimeter, and a glass dosimeter.

On the other hand, the first to third insertion rods 71, 73 and 75 provided with the first to third dosimeters 72, 74 and 76 of the fifth measuring unit 70 are not only used for measuring the dose, , And maintenance of the third phantom part (13). Specifically, at least one of the first to third insertion rods 71, 73, and 75 of the fifth measuring unit 70 is inserted into the bladder phantom 14, It can be used to insert the inside of the uterine phantom 15, vaginal phantom 16, and rectum phantom 17 to remove the inner mold. It is also possible to clean the impurities introduced into the bladder phantom 14, the uterine phantom 15, the vaginal phantom 16, and the rectal phantom 17 during use. In addition, the fifth measuring unit 70 may be inserted into the bladder phantom 14 to control the amount of fluid such as water flowing into the bladder phantom 14.

As described above, the phantom unit 10 according to the present invention is formed of a material having a CT number similar to that of a human body, which is the same as the anatomy of the pelvis, and the measurement unit 20 is inserted into the phantom unit 10 . Therefore, it becomes possible to measure the near-field radiation dose for the phantom unit 10, and it becomes possible to accurately predict the radiation dose for the pelvis of the human body.

Meanwhile, the pelvic phantom 1 described above can be applied not only to computed tomography (CT) and magnetic resonance imaging (MRI) but also to positron emission tomography (PET) and ultrasound imaging. In particular, in the case of the proximity radiotherapy, the phantom unit 10 of the pelvic phantom 1 with the legs closed as shown in FIG. 1 can be mainly applied for the MRI imaging. In addition, the phantom unit 10? Having the legs opened as in the modification of the pelvis phantom 1 shown in Fig. 12 can be applied mainly to CT imaging. The phantom unit 10? According to the modification shown in Fig. 12 also includes first to third phantom units 11?, 12 ?, 13?.

However, the present invention is not limited thereto. The phantom unit 10 having the legs as shown in Fig. 1 and the phantom unit 10? Having the legs as shown in Fig. 12 can be used for both MRI and CT. That is, the phantom unit 10 having the legs as shown in FIG. 1 and the phantom unit 10? Having the legs as shown in FIG. 12 can be used for CT, MRI, PET and ultrasound imaging. Any one of the phantom units 10 and 10?

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

1: Pelvic phantom
10: Phantom unit
11: First phantom part
12: second phantom part
13: Third phantom part
20: Measuring unit
30: first measuring unit
31: MOSFET dosimeter
40: second measuring unit
41: OSLD dosimeter
50: Third measuring part
51: TLD dosimeter
60: fourth measuring unit
61: Glass dosimeter
70: fifth measuring unit
71, 73, 75: first to third insertion rods
72, 74, 74: first to third dosimeters

Claims (14)

A phantom unit having a shape corresponding to an anatomical structure of the human pelvis; And
A measurement unit for measuring a radiation dose for the phantom unit;
/ RTI >
The phantom unit is formed of a material similar to a CT (Computed Tomography) number corresponding to the human body,
The phantom unit includes:
A first phantom part corresponding to the external shape of the human body and formed of a silicon material;
A second phantom part corresponding to the bones of the human body and formed of a urethane material in the first phantom part; And
A third phantom having a shape corresponding to an organ including the bladder, uterus, vagina, and rectum of the human body, the third phantom being formed of a volumetrically deformable silicone material;
Including the pelvic phantom.
delete The method according to claim 1,
The third phantom part is provided with an insertion port for communicating the inside and the outside,
Wherein the measurement unit is insertable through the insertion port.
The method according to claim 1,
Wherein the third phantom includes a bladder phantom, a uterus phantom, a vaginal phantom, and a rectal phantom having shapes corresponding to the bladder, the uterus, the vagina, and the rectum, respectively.
The method according to claim 1,
Wherein the measuring unit comprises:
A dose meter inserted into the phantom unit for measuring a dose of radiation;
A pair of support plates for supporting the dose meter therebetween; And
A clip for mutually fixing the pair of support plates;
And at least one measurement section including the measurement section,
Wherein the dosimeter comprises at least one of a metal oxide field effect transistor (MOSFET) dosimeter, an OSLD (Optically Stimulated Luminescence Dosimeter) dosimeter, a TLD (Thermoluminescence Dosimeter) dosimeter, and a glass dosimeter.
6. The method of claim 5,
Wherein the measurement unit is inserted into the uterine direction from the hip region of the phantom unit to measure the dose of radiation.
5. The method of claim 4,
Wherein the measuring unit comprises:
And a bar-shaped measuring unit inserted into the bladder phantom, the vaginal phantom, and the rectal phantom through an insertion port provided to communicate the inside and the outside of the bladder,
And a pedometer for measuring a radiation dose is provided at an insertion end of the measurement unit.
8. The method according to any one of claims 1 to 7,
The phantom unit may be a computed tomography (CT), a magnetic resonance imaging (MRI), a positron emission tomography (PET), or a pelvic phantom capable of ultrasound imaging.
A phantom unit having a shape corresponding to an anatomical structure of the human pelvis and formed of a material similar to a CT (Computed Tomography) number corresponding to the human body; And
A measurement unit inserted into the phantom unit for measuring a dose of radiation to the phantom unit;
Is formed,
The phantom unit includes:
A first phantom part corresponding to the external shape of the human body and formed of a silicon material;
A second phantom part corresponding to the bones of the human body and formed of a urethane material in the first phantom part; And
A third phantom portion formed in the first phantom portion and corresponding to an organ of the human body and made of a silicon material;
/ RTI >
The third phantom part includes a plurality of organs phantom having a shape corresponding to the bladder, uterus, vagina, and rectum of the human body, respectively, and the plurality of organs phantom are respectively connected to the outside to be volume deformed.
delete delete 10. The method of claim 9,
The third phantom part is provided with an insertion port for communicating the inside and the outside,
Wherein the measurement unit is insertable through the insertion port.
10. The method of claim 9,
Wherein the measurement unit includes a dosimeter which is inserted into the phantom unit and measures a dose of radiation,
Wherein the dosimeter comprises at least one of a metal oxide field effect transistor (MOSFET) dosimeter, an OSLD (Optically Stimulated Luminescence Dosimeter) dosimeter, a TLD (Thermoluminescence Dosimeter) dosimeter, and a glass dosimeter.
14. A method according to any one of claims 9, 12 and 13,
The phantom unit may be a computed tomography (CT), a magnetic resonance imaging (MRI), a positron emission tomography (PET), or a pelvic phantom capable of ultrasound imaging.

Images