JP4671282B2 - Ultrasonic device - Google Patents

Description

  The present invention relates to an ultrasonic apparatus, and more particularly to an ultrasonic apparatus suitable for prostate cancer sealed brachytherapy permanent insertion therapy (brachytherapy) in which a brachytherapy source is placed in the prostate by a puncture needle.

  This type of ultrasonic apparatus selects a tomographic image (linear image) including a prostate obtained by an ultrasonic probe and an appropriate tomographic image (linear image) by rotating the ultrasonic probe. It has become. In order to image the tomographic image of a puncture needle that is guided by a guide hole of a grid template that constitutes a treatment jig together with the ultrasonic probe and is inserted in a direction parallel to the longitudinal direction of the ultrasonic probe. is there.

  Then, while observing the tomographic image, the puncture needle is moved in the axial direction, and when the puncture needle is positioned at an appropriate location, the brachytherapy source is sequentially placed from the tip of the puncture needle. It has become.

Such a technique is disclosed, for example, in Patent Document 1 below.
Special table 2002-509517 gazette

  However, the ultrasonic device configured in this way has no experience of where to place the brachytherapy source, even if it is placed while observing the tomographic image of the puncture needle. It depends on the law and may require an expert separately from the operator.

  On the other hand, such treatment is usually pre-set with treatment planning software, etc., and if a brachytherapy source can be placed at an appropriate location according to this treatment planning software, etc., the efficiency of treatment can be improved. Such a realization was requested. Moreover, such a request is not disclosed in Patent Document 1 described above.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide an ultrasonic apparatus capable of accurately placing a small-beam source at a predetermined position.

   Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.

(1) An ultrasonic device according to the present invention includes, for example, a treatment jig and an image display device, and the treatment jig has at least a group of ultrasonic transducers arranged in parallel in the longitudinal direction and is supported by a fixed base. An ultrasonic probe capable of rotating around an axis parallel to at least the longitudinal direction and a plurality of guide holes supported by the fixed base and capable of guiding a puncture needle movable in the longitudinal direction of the ultrasonic probe are provided. A template, and the imaging device images a tomographic image obtained from the ultrasonic transducer,
The puncture needle can place a brachytherapy source from its tip,
Probe rotating means for obtaining a tomographic image including the axis of the guide hole by rotation of the ultrasonic probe by inputting position information of the guide hole for inserting the puncture needle;
In addition to the tomographic image, graphic image creation means for creating at least a needle insertion path displayed on the axis and a brachycardia indwelling planned position mark displayed on the needle insertion path is provided. Features.

(2) An ultrasonic apparatus according to the present invention is based on, for example, the configuration of (1), wherein the tomographic image is a tomographic image of the prostate, and the graphic image creating means includes the needle insertion path and the brachytherapy device placement. In addition to the planned position mark, a prostate base point position mark is also created, and this prostate base point position mark is displayed together with the tomographic image.

(3) The ultrasonic apparatus according to the present invention is, for example, on the premise of the configuration of (2), wherein the prostate base point position mark is displayed as a line segment that intersects the insertion path.

(4) The ultrasonic apparatus according to the present invention is based on, for example, the configuration of either (2) or (3), and the prostate base point position mark moves on the insertion path by an input from the operation panel. It is characterized by that.

(5) The ultrasonic apparatus according to the present invention is based on the configuration of (2), for example, and extracts the outer contour of the prostate from the information of the tomographic image obtained from the ultrasonic transducer group. The prostate origin position mark is created by contact.

(6) The ultrasonic apparatus according to the present invention is based on, for example, the configuration of any of (2), (3), (4), and (5), and is based on information of tomographic images obtained from the ultrasonic transducer group. Needle tip analyzing means for detecting position information of the tip of the puncture needle, and brachytherapy position comparison processing for determining whether the information from the needle tip analyzing means matches the information of the planned brachyposition position And a sound output means for generating a sound when the coincidence is determined by the brazing source indwelling position comparison processing means.

(7) The ultrasonic apparatus according to the present invention is based on, for example, the configuration of any of (2), (3), (4), and (5), and is based on information of tomographic images obtained from the ultrasonic transducer group. Needle tip analyzing means for detecting position information of the tip of the puncture needle, and brachytherapy position comparison processing for determining whether the information from the needle tip analyzing means matches the information of the planned brachyposition position And a display blinking means for blinking at least a part of the graphic image when the coincidence is determined by the brazing source indwelling position comparison processing means.

  In addition, this invention is not limited to the above structure, A various change is possible in the range which does not deviate from the technical idea of this invention.

  Embodiments of an ultrasonic device according to the present invention will be described below with reference to the drawings.

  FIG. 2 is a block diagram showing an embodiment of the ultrasonic apparatus according to the present invention, and shows the appearance thereof.

  As shown in FIG. 2, the ultrasonic apparatus is roughly configured to include an apparatus main body 1, a treatment jig 2, and an image display device 3. The treatment jig 2 and the image display device 3 are respectively connected to the device main body 1 and used.

  The treatment jig 2 includes an ultrasonic probe 4 and a grid template 6 for guiding the treatment puncture needle 5 respectively attached to a fixed base 8.

  The ultrasonic probe 4 has a first ultrasonic transducer group 4A that can input image information consisting of a so-called linear image arranged in the longitudinal direction, and image information consisting of a so-called convex image arranged circumferentially at the tip. The second ultrasonic transducer group 4B that can be input is provided. In the figure, the positional relationship between the linear image 9A obtained by the first ultrasonic transducer group 4A and the convex image 9B obtained by the second ultrasonic transducer group 4B is conceptualized in relation to the ultrasonic probe 4. Is shown.

  The ultrasonic probe 4 is attached so as to be movable with respect to the fixed base 8, and can move back and forth in the longitudinal direction and rotate within a certain range with respect to an axis parallel to the longitudinal direction. It is like that. The movement and rotation of the ultrasonic probe 4 are configured to be driven by a probe rotating unit (indicated by reference numeral 4D in FIG. 3) disposed in the treatment jig. The grit template 6 is arranged so that its main surface is orthogonal to the longitudinal direction of the ultrasonic probe 4 and is fixed to the fixed base 8. And the grid template 6 represents the row | line | column of each guide hole 7A formed in the matrix form in either of 1, 2, ..., 7 of the said display, as shown in the top view in the same figure, Can be expressed by any one of A, B,..., G in the above-described display. For example, each guide hole 7A can be expressed as (2, B), (2, D), (4, E), for example. Can be identified.

  FIG. 3 is a block diagram showing the configuration of the ultrasonic apparatus, in which an ultrasonic probe 4 (including a probe rotating unit 4D for rotating the ultrasonic probe 4) is shown. The other configurations except for the image display device 3 and the operation panel 10 are configured to be incorporated in the device main body 1. This is because the ultrasonic probe 4 is the ultrasonic probe 4 shown in FIG. 2, and the image display device 3 is the image display device 3 shown in FIG. Although not shown in FIG. 2, the operation panel 10 is, for example, integrally attached to the outer surface of the apparatus main body 1.

  In FIG. 3, the information of the tomographic image of the subject including the treatment site is obtained by driving the ultrasonic transducer of the ultrasonic probe 4 used in contact with the subject by the ultrasonic image acquisition circuit 11. The reflected echo obtained by the above is input to the ultrasonic image acquisition circuit 11 via the ultrasonic transducer and obtained. An output from the ultrasonic image acquisition circuit 11 is input to the image display device 3 via the display information configuration unit 12, and the tomographic image is displayed on the image display device 3. The display information configuration unit 12 is configured to input information from a graphic image creation unit 13 described later when the graphic display is displayed on the image display device 3 so as to overlap the tomographic image.

  On the other hand, in this embodiment, when the puncture needle 5 is inserted through the guide hole 7A of the grid template 7, the operation panel 10 is inputted with positional information of the guide hole 7A for guiding the puncture needle 5. It can be done.

  From the operation panel 10, the position information of the guide hole 7 </ b> A is input to the rotation angle calculation unit 14, and the rotation angle calculation unit 14 selects the grid template 7 from the current rotation position of the ultrasonic probe 4. Further, the rotation amount of how much rotation is required until a tomographic image including the extension direction axis of the guide hole 7A is calculated, and the probe rotating unit 4D is driven.

  In this case, the rotation amount is calculated as follows, for example. FIG. 4 is a diagram showing the ultrasonic probe 4 and a grid template 7 when the ultrasonic probe 4 is viewed from the direction of the rotation axis. When the line segment perpendicular to the rotation axis of the ultrasonic probe 4 intersects the selected guide hole 7A of the grid template 7 is L2, the vertical line intersecting the line segment L2 and the rotation axis of the ultrasonic probe 4 is used. The angle θ2 between the line segment LV can be easily calculated. This is because the angle θ2 is uniquely determined by the position of each guide hole 7A. Now, assuming that the direction of the first ultrasonic transducer 4A of the ultrasonic probe 4 is in the direction of the line segment L1 in the figure, this line segment L1 crosses the rotation axis of the ultrasonic probe 4. The angle θ1 with respect to the vertical line segment LV to be detected is detected by the rotation angle learning unit 15 described later. For this reason, when the ultrasonic probe 4 is rotated (θ1 + θ2) by the probe rotating unit 4D, the first ultrasonic transducer 4A is directed in the direction of the line segment L2. This means that the tomographic image information obtained by the first ultrasonic transducer 4A is obtained as tomographic image information including the virtual extension axis of the selected guide hole 7A of the grid template 7.

  Further, the position information of the guide hole 7A for guiding the puncture needle 5 is inputted from the operation panel 10 to the graphic image creating unit 13. The graphic image creation unit 13 includes a needle insertion path creation unit 13A, a brachytherapy placement position creation unit 13B, and a prostate base position mark creation unit 13C. Among these, the position information of the guide hole 7A for guiding the puncture needle 5 is input to the needle insertion path creation unit 13A and the prostate reference point position mark creation unit 13C.

  The needle insertion path creation unit 13A draws a line segment superimposed on the virtual extension axis against a tomographic image including the virtual extension axis of the selected guide hole 7A of the grid template 7. Yes. This line segment corresponds to the needle insertion path, and when the puncture needle 5 is inserted through the guide hole 7A in the subsequent process, the puncture needle 5 moves along the needle insertion path. 3 comes to be imaged.

  In this embodiment, the prostate reference point position mark creating unit 13C includes a prostate reference point position mark composed of a line segment orthogonal to the needle insertion path, and a plurality of distance reference lines that are spaced at equal intervals in parallel to the prostate reference point position mark. And to draw. In this case, the position of the prostate base point position mark is not strictly set, and is drawn so as to be positioned on the left side of the image of the image display device 3 as an approximate guide. This is because, in a later step, an operation of matching the prostate image with the prostate origin position mark is performed on the prostate image.

  And the information from the treatment plan software part 16 is input into the brachytherapy indwelling plan position creation part 13B. The treatment planning software unit 16 relates to predetermined planning information for placing a brachytherapy source on the prostate, and at least in this embodiment, the brachytherapy is placed at every distance from the tip of the prostate. It contains information on what to do. In the brachytherapy indwelling planned position creation unit 13B, in the graphic in which the needle insertion path and the prostate origin position mark are defined, a plurality of distances from the intersection with the prostate origin position mark on the needle insertion path at predetermined distances. The braided source detention plan position mark is drawn.

  In this embodiment, the needle tip position analyzing unit 17 is provided, and the tomographic information from the ultrasonic image acquisition circuit 11 obtained after the puncture needle 5 is inserted into the subject is used, for example, for the outer contour of the puncture needle 5. Information is extracted and position information of the tip of the puncture needle 5 is analyzed. Information from the needle tip position analysis unit 17 is input to the brachytherapy source indwelling position comparison processing unit 18. Information on the prostate base point position is input from the prostate base position mark creation unit 13C to the brachytherapy source placement position comparison processing unit 18, and information on the brachytherapy source placement plan position is input from the brachytherapy source placement plan position creation unit 13B. Have been entered. That is, the brachytherapy indwelling position comparison processing unit 18 can detect whether or not the tip of the puncture needle to be moved (mainly retracted in this case) matches the brachytherapy indwelling planned position. ing. When a coincidence between the tip of the puncture needle 5 and the brachytherapy placement position is detected, a warning is issued by the voice output unit 20 through the voice information creation unit 19. The reason for this is to avoid missing the dwarf source.

  Hereinafter, an operation of placing the brachytherapy source accurately at the planned brachytherapy site from the prostate base point using the ultrasonic apparatus having the above-described configuration will be described. In a state where the ultrasound probe 4 is arranged to obtain a linear image of the prostate of a subject (not shown), first, for example, one guide hole 7A among the guide holes 7A of the grid template 7 is specified. To do. This specified guide hole 7A becomes the guide hole 7A into which the puncture needle 5 is to be inserted in the subsequent operation. The guide hole 7A is specified by inputting numerals and characters of the position coordinates of the guide hole 7A to the operation panel 10. The input is for example (4, F).

  In this case, the apparatus main body 1 drives the probe rotating unit 4D of the ultrasonic probe 4 based on the position coordinate information input to the operation panel 10. As shown in FIG. 4, the specified guide hole 7 </ b> A on the grid template 7 has an angle θ that is uniquely specified with respect to the longitudinal axis of the ultrasonic probe 4. If the angle on the longitudinal axis of the ultrasonic probe 4 at the present time is known, the ultrasonic probe 4 is rotated so as to match the specified angle with this angle as a reference. Note that the current angle on the longitudinal axis of the ultrasound probe 4 is detected by the rotation angle acquisition unit 15 shown in FIG.

  Thereby, as shown in FIG. 1A, the prostate fistula cross-sectional image SI is imaged on the image display device 3, and this prostate fistula cross-sectional image SI is from now on the specified guide of the grid template 7. It is a tomographic image cut along a plane including the insertion direction axis of the puncture needle 5 to be inserted through the hole 7A. On the other hand, a graphic image to be displayed superimposed on the prostate fistula cross-sectional image SI is created by the graphic image creation unit 13, and the graphic image is displayed on the needle insertion path NL, this needle insertion as shown in FIG. It consists of a prostate reference point position mark (line) BM drawn perpendicular to the path NL and a distance reference line FL drawn in parallel with the prostate reference point position mark BM and at equal intervals. In the image display device 3, the needle insertion path NL is displayed as a straight line parallel to the x axis, and the prostate base position mark BM and the distance reference line FL are displayed as straight lines parallel to the y axis.

  As described above, a tomographic image is displayed on the image display device 3 based on the image information from the ultrasound probe 4, and the tomographic image includes the prostate fistula sectional image SI. . In this case, as shown in FIG. 1A, the prostate is usually displayed with its tip shifted from the prostate base position mark BM. By moving in the direction, the tip of the prostate is made to coincide with the prostate base position mark BM. In order to inform the apparatus main body 1 of this fact, for example, confirmation information is input through the operation panel 10.

  In this case, in the apparatus main body 1, on the graphic image, the brachytherapy position mark LM is created on the needle insertion path NL with the prostate base position mark BM as the start point, as shown in FIG. Are displayed on the image display device 3. The brachytherapy placement position mark LM in this case means that the information of the treatment plan software unit 16 is visualized on the image display device 3.

  After the preparation as described above is made, the puncture needle 5 is inserted into the above-described guide hole 7A of the grid template 7 so as to be guided into the subject as it is. The image display device 3 displays an image of the puncture needle 5 being moved along the needle insertion path NL displayed on the image display device 3. For this reason, while observing the image display device 3, the puncture needle 5 is moved until the tip thereof coincides with the prostate base position mark BM. FIG. 1 (c) shows a case where the tip of the puncture needle 5 has exceeded the prostate base position mark BM, but in this case as well, the puncture needle 5 is retracted so that FIG. ), The tip is made to coincide with the prostate base point position mark BM.

  The brachytherapy site position plan mark LM is attached at a position intersecting the prostate base position mark BM on the needle insertion path NL, and the tip of the puncture needle 5 is positioned at this position. A brachytherapy source is placed from the tip. Thereafter, the puncture needle 5 is retracted so that the tip thereof is positioned at the next brachytherapy indwelling planned position mark LM, and the brachytherapy source is placed from the tip of the puncture needle 5. Thereafter, this operation is repeated.

  In this embodiment, for convenience of explanation, the puncture needle 5 inserted into the guide hole 7A of the grid template 7 is described as one. However, it goes without saying that a plurality of puncture needles 5 may be provided. This is because the above-described operation is performed on each puncture needle 5.

  In the embodiment described above, the following operations are performed as shown in the flowchart of FIG. That is, as shown in FIG. 10, the rotation angle of the ultrasonic probe 4 is detected in step ST1. This is necessary to obtain a cross-sectional image in which the process of inserting the puncture needle 5 can be seen, and the cross-sectional image can be obtained from the detected angle and insertion position information of the puncture needle 5. In the next step ST2, the prostate base point position is acquired on the tomographic image. This prostate base point position is the first place where the brachytherapy source is placed, and the distance away from this base point based on the treatment planning software is the place where the brachytherapy source is placed later. In the next step ST3, locations for placing the brachytherapy source are acquired based on the treatment planning software, and in the final step ST4, these locations are displayed on the cross-sectional image. On the needle insertion path through which the puncture needle 5 will be inserted. For this reason, it is possible to place the brachytherapy source at an appropriate predetermined position by simply moving the puncture needle (retracting) and determining whether or not its tip matches the displayed placement location. become able to. This means that it is almost impossible to place the brachytherapy source in the wrong place due to carelessness of the operator.

  In the embodiment described above, the following operations are performed as shown in the flowchart of FIG. That is, as shown in FIG. 11, in step ST1, the position of the tip of the puncture needle 5 imaged on the image display device 3 is detected. For example, it can be easily detected by tracking the movement of the image corresponding to the tip of the puncture needle 5. In the next step ST2, the braided source detention plan position is acquired. This position can be easily determined from the indication of the planned placement of the source of the beam source LM. In the next step ST3, it is determined by comparison whether or not the tip position of the puncture needle 5 matches the brachytherapy placement position. Since each of these positions is on the needle insertion path, the determination is very easy. In the next step ST4, if a match is found, the operator is informed by voice. Even if the operator is not observing the image display device 3, the operator can recognize from the voice that the brachytherapy source must be placed.

  5A and 5B correspond to FIGS. 5A and 5B, respectively. In the image display device 3, the prostate fistula sectional view SI, the needle insertion path NL, and the prostate base point position mark BM Is displayed, and when the prostate base position mark BM is displayed offset from the tip of the prostate, it is an explanatory view showing a different embodiment in the case where the prostate base position mark BM and the prostate tip are matched. .

  In the embodiment in this case, as shown in FIG. 6, the operation panel 10 is provided with, for example, a trackball 10A. By operating the trackball 10A, as shown in FIG. The base position mark BM can be freely moved in the x-axis direction in the image display device 3. As a result, when the prostate base position mark BM matches the distal end of the prostate, confirmation information is input through the operation panel 10 in order to notify the apparatus main body.

  After that, as shown in FIG. 5 (b), the apparatus main body 1 creates the brachytherapy placement position mark FL on the needle insertion path NL with the prostate base position mark BM as the starting point on the graphic image. And displayed on the image display device 3.

  5 (a) and 5 (b), the distance guide line FL is shown to be created at the time of the small wire source detention plan position mark LM, but it is limited to this. Needless to say, it may be generated at the same time as the position of the prostate base position mark BM is determined at the previous stage. This is because the distance reference line FL is created at a certain distance from the prostate base point position mark BM, and is formed so that the sense of distance of each small-line source placement planned position mark LM can be easily grasped.

  7 (a) and 7 (b) are explanatory views showing another embodiment that changes to FIGS. 5 (a) and 5 (b). At the stage where the prostate fistula sectional view SI is imaged on the image display device 3, FIG. In this embodiment, at least the prostate base point position mark BM is automatically displayed. By operating the ultrasonic probe 4 or the track bowl 10A as in the above-described embodiment, it is possible to save the trouble of making the prostate base position mark BM coincide with the tip of the prostate.

  That is, as shown in FIG. 8, a prostate outer contour extraction unit 22 for inputting an output from the ultrasound image acquisition circuit 11 is provided, and the prostate base point position mark BM is determined from the prostate outer contour. This is to be formed by the creation unit 13C.

  Information on the outer contour OL of the prostate is obtained by detecting the luminance of the prostate fistula sectional view SI stored in the memory by the outer contour extracting unit 22 of the prostate, and the position of the tip of the prostate (the maximum) is obtained from this information. Left outer contour information) is calculated. Then, as shown in FIG. 7 (a), the position of the prostate base point position mark BM is specified so as to match the position of the tip of the prostate, thereby automatically setting the prostate base point position mark BM. Can do.

  After that, as shown in FIG. 7 (b), the apparatus main body 1 creates the brachycardia indwelling planned position mark LM on the needle insertion path NL from the prostate base position mark BM on the graphic image. And displayed on the image display device 3.

  Further, in the embodiment shown in FIG. 1, when the puncture needle 5 is moved and the tip of the puncture needle 5 overlaps with the brachytherapy site placement plan mark LM, it is configured to notify by voice. However, the present invention is not limited to this. For example, as shown in FIG. 9, when the tip of the puncture needle 5 overlaps the brachytherapy source placement planned position mark LM, Needless to say, the display blinking unit 23 may be configured to send an output, and the display blinking unit 23 may be configured to blink a part of the graphic image.

  Each of the embodiments described above may be used alone or in combination. This is because the effects of the respective embodiments can be achieved independently or synergistically.

FIG. 3 is a process chart showing an embodiment of an operation mode of the ultrasonic apparatus according to the present invention. It is a block diagram which shows one Example of the external appearance structure of the ultrasonic device by this invention. It is a block diagram which shows one Example of a structure of the ultrasonic device by this invention. It is explanatory drawing shown by the relationship with rotation of the ultrasonic probe for obtaining a predetermined sectional view in the ultrasonic device by the present invention. It is a process figure which shows the other Example of the operation mode of the ultrasonic device by this invention. It is a block diagram which shows the other Example of a structure of the ultrasonic device by this invention. It is a process figure which shows the other Example of the operation mode of the ultrasonic device by this invention. It is a block diagram which shows the other Example of a structure of the ultrasonic device by this invention. It is a block diagram which shows the other Example of a structure of the ultrasonic device by this invention. It is a flowchart which shows the principal part operation | movement of the ultrasonic device by this invention. It is a flowchart which shows the other principal part operation | movement of the ultrasonic device by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Apparatus main body, 2 ... Treatment jig, 3 ... Image display device, 4 ... Ultrasonic probe, 4D ... Probe rotation part, 5 ... Puncture needle, 7 ... Grid template, 7A: Guide hole, 10: Operation panel, 11: Ultrasound image acquisition circuit, 12: Display information configuration unit, 13: Graphic image creation unit, 13A: Needle insertion path creation unit, 13B: Small Radiation source indwelling planned position creation unit, 13C: Prostate base position mark creation unit, 14: Rotation angle calculation unit, 15 ... Rotation angle acquisition unit, 16 ... Treatment planning software unit, 17 ... Needle tip position analysis unit , 18... Brachytherapy position comparison processing section, 19... Voice information creation section, 20... Voice output section, NL... Needle insertion path, BM. Planned position mark, FL ... Distance reference line.

Claims (7)

A treatment jig and an image display device are provided. The treatment jig has at least a group of ultrasonic transducers arranged side by side in the longitudinal direction and is supported by a fixed base and rotates around an axis parallel to at least the longitudinal direction. And a template provided with a plurality of guide holes supported by the fixed base and capable of guiding a puncture needle that can move in the longitudinal direction of the ultrasonic probe. Tomographic images obtained from acoustic transducers,
The puncture needle can place a brachytherapy source from its tip,
Probe rotating means for obtaining a tomographic image including the axis of the guide hole by rotation of the ultrasonic probe by inputting position information of the guide hole for inserting the puncture needle;
In addition to the tomographic image, graphic image creation means for creating at least a needle insertion path displayed on the axis and a brachycardia indwelling planned position mark displayed on the needle insertion path is provided. Ultrasonic device characterized.   The tomographic image is a tomographic image of the prostate, and the graphic image creating means creates a prostate base point position mark in addition to the needle insertion path and the brachytherapy placement position mark, and the prostate base point position mark The ultrasonic apparatus according to claim 1, wherein the ultrasonic apparatus is displayed together with the tomographic image.   The ultrasonic apparatus according to claim 2, wherein the prostate base point position mark is displayed as a line segment that intersects the insertion path.   The ultrasound apparatus according to claim 2, wherein the prostate base point position mark moves on the insertion path by an input from an operation panel.   3. The prostate origin position mark is created by extracting an outer contour of a prostate from information of tomographic images obtained from an ultrasonic transducer group and contacting a part of the outer contour. Ultrasonic device.   Needle tip analysis means for detecting position information of the tip of the puncture needle from tomographic image information obtained from the ultrasonic transducer group, and whether the information from the needle tip analysis means matches the information on the planned position of placement of the brachytherapy source Characterized in that it comprises: a brachysource indwelling position comparison processing means for determining whether or not, and an audio output means for generating a sound when the coincidence is determined by the brazing source indwelling position comparison processing means. The ultrasonic device according to any one of claims 2, 3, 4, and 5.   Needle tip analysis means for detecting the position information of the tip of the puncture needle from the tomographic image information obtained from the ultrasonic transducer group, and whether the information from the needle tip analysis means matches the information on the planned position of placement of the brachytherapy source A braid source indwelling position comparison processing unit that determines whether or not, and a display blinking unit that blinks at least a part of the graphic image when the coincidence is determined by the brazing source indwelling position comparison processing unit. The ultrasonic device according to any one of claims 2, 3, 4, and 5, wherein:

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