JP2009136384A - Implant selection supporting device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a template image read from a transparent sheet-like template where a visible outline of an implant is described in an appropriate size relative to a medical image without performing complicated work. <P>SOLUTION: Additional information including a resolution of the medical image is acquired with the medical image by a medical image acquisition means 200. In addition, the additional information with a desired template image is read from a template image holding means 220 for holding the template image read from the template and the additional information including the resolution. Then, the template image is superimposed on the medical image and is displayed on a monitor device 30. At the time, the template image magnification means 230 varies the magnification of the template image based on each resolution of the medical image and the template image and a magnification ratio of the medical image in the monitor device 30 so that the resolution on the screen of both images coincides. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an implant selection support apparatus and program, and more particularly to a technique for selecting an implant used for artificial joint replacement surgery or the like on a display screen.

  In an operation using an implant such as an artificial joint replacement operation, it is important to select an implant having an appropriate shape and size according to the patient. At present, many clinicians use the template with the outline of the implant drawn on a transparent sheet on the X-ray film when performing preoperative planning such as artificial joint replacement surgery. Select an implant that is predicted to fit.

  On the other hand, in recent years, systemization in hospitals has progressed, and various systems such as a picture management system (PACS: Picture Archiving Communication System) have come into operation in hospitals. As a result, filmless medical images have been developed, and the number of cases in which X-ray images are observed only on a display without using an X-ray photographic film is increasing. Similarly, in preoperative planning such as artificial joint replacement surgery, a system that displays an X-ray image and a template image superimposed on the display without using an X-ray film (hereinafter referred to as an implant selection support system) has appeared. However, it is beginning to be used for preoperative planning (Patent Document 1).

  In general, a template on which an outline of an implant is drawn is created by a manufacturer that manufactures and sells the implant. Therefore, in order to use the template in the implant selection support system, the implant selection support system manufacturer needs to receive the digital data of the implant from the implant manufacturer and incorporate the digital data into the system.

  However, new implants are being developed every day, and if the hospital wants to use a newly developed implant template in an implant selection support system, it must wait for the implant selection support system manufacturer to incorporate the digital template into the system. I have a problem.

  Therefore, it is conceivable to create a digital template by reading a transparent sheet template held by a hospital with a scanner. In order to use a template image obtained by reading with a scanner as a medical digital template, it is necessary to display the template image in an appropriate size with respect to the X-ray image displayed on the display.

  In Patent Document 2, taking into account the case where the reading resolution of the template is changed by reading with an image reading apparatus such as a scanner or the processing after reading, a scale is attached to the template and the length of the scale is measured. An information processing apparatus is described that determines the enlargement ratio of the template, determines whether the enlargement ratio is within a predetermined error range, and corrects the resolution of the template if it is not within the error range. Yes.

Patent Document 3 discloses a model image input from a scanner, or a template image input via a network or a recording medium (CD-ROM). The model number, size, manufacturer, and part of the implant indicated by the template image. An operation plan support device that provides additional information such as information has been proposed, and in particular, a device that can efficiently input the additional information has been proposed.
JP 2003-271749 A Japanese Patent Laid-Open No. 2007-200353 JP 2007-233870 A

  However, the apparatus described in Patent Document 2 needs to add a scale or the like to the template in advance in order to confirm the enlargement ratio of the template. However, the transparent sheet template held by the hospital is provided by various implant manufacturers. The template format must be standardized so that it cannot be used. In addition, the invention described in Patent Document 2 has a problem that the length information of the template data must be measured each time when displaying a medical image with different resolutions, and the work becomes complicated. .

  On the other hand, the cited document 3 does not have a description of recording the resolution (reading resolution) when the template is read by an image reading device such as a scanner as the incidental information of the template image.

  Furthermore, paragraph [0017] of Cited Document 3 describes that background portions other than line drawings of image data have a transmission attribute. However, image data obtained by reading with a scanner generally has a transmission attribute. Therefore, an operation for converting to image data having a transparent attribute in advance is required, which is complicated.

  The present invention has been made in view of such circumstances, and can use a transparent sheet-like template on which the outline of an implant owned by a hospital is drawn as it is, and without performing complicated work, the template It is an object of the present invention to provide an implant selection support apparatus and program capable of displaying a template image read from the above in an appropriate size with respect to a displayed medical image.

  In order to achieve the above object, an implant selection assisting apparatus according to claim 1 includes a medical image acquisition means for acquiring a medical image of a patient to which an implant is applied and additional information including at least the resolution of the medical image, Template image acquisition means for acquiring a template image indicating a transparent sheet-like template on which a line drawing including an outline is drawn, the acquired template image, and auxiliary information including at least the resolution of the template image are stored in association with each other. Storage means, template image selection means for selecting an arbitrary template image from the template images stored in the storage means, display means for displaying the acquired medical image and the selected template image in an overlapping manner, and the medical use Medical image to be scaled and displayed on the display means A scaling unit, and a template image scaling unit that scales the template image and displays the template image on the display unit, and obtains the resolution on the screen after scaling of the medical image and the resolution of the template image, And a template image scaling unit for scaling the template image so that the resolution of the scaled medical image on the screen matches the resolution of the template image on the screen.

  That is, the medical image and the template image are acquired, and accompanying information including the resolution of each image is acquired. The template image and its accompanying information are stored in association with each other in the storage means.

  A template image appropriately selected from the template images stored in the storage unit is superimposed on the acquired medical image and displayed on the display unit, and an optimal template image (implant) is selected.

  At this time, the resolution of the template image on the screen is matched with the resolution of the medical image displayed on the display means. That is, the resolution on the screen after scaling of the medical image and the resolution of the template image are obtained, and the template so that the resolution on the screen of the medical image after scaling and the resolution on the screen of the template image match. Scale the image. The on-screen resolution of the medical image after scaling can be obtained from the resolution of the medical image and the scaling factor when displayed on the display means.

  Thus, by displaying the screen resolution of the medical image on the screen of the display means and the screen resolution of the template image in agreement with each other, it is possible to accurately compare the sizes of both images. Template images (implants) can be selected.

  As shown in claim 2, in the implant selection support device according to claim 1, the template image scaling unit changes a ratio between the resolution of the medical image after the scaling and the resolution of the template image. The template image is scaled as a magnification.

  3. The implant selection support device according to claim 1 or 2, wherein a transparent attribute indicating that the background portion is transparent in a background portion other than the line drawing indicating the implant in the template image. Further, a transparent attribute setting means for setting is provided. As a result, even when the template image is displayed superimposed on the medical image, the medical image of the background portion other than the line drawing of the template image can be visually recognized, and the template image and the medical image can be compared well. it can.

  The implant selection support device according to any one of claims 1 to 3, wherein incidental information including a resolution of the medical image is added as tag information to the medical image. It is said. As a result, by reading the tag information of the medical image, it is possible to acquire incidental information including the resolution of the medical image.

  5. The implant selection support device according to claim 1, wherein the template image acquisition unit takes in the template image from an image reading device that reads the template, or the image reading device. The template image output from is stored in an external storage unit that stores the template image.

  That is, the template image may be obtained directly from an image reading device such as a scanner that reads a transparent sheet template, or is read in advance by an image reading device and recorded on a recording medium such as a CD-ROM. May be obtained via the recording medium.

  6. The implant selection support apparatus according to claim 5, wherein additional information including resolution at the time of reading the template by the image reading apparatus is added to the template image as tag information, and the storage unit Is characterized by storing a template image to which the tag information is added.

  That is, when a template image is created by reading a transparent sheet template with an image reader, only the image file need be stored if the resolution is recorded in the tag of the image file.

  7. The implant selection support apparatus according to claim 5, further comprising resolution input means for manually inputting a resolution at the time of template reading by the image reading apparatus, wherein the storage means includes the template image. Along with the template image acquired by the acquisition means, the resolution input by the resolution input means is stored in association with the template image.

  In other words, if the resolution at the time of reading the template image is not recorded in the tag of the image file in which the template image is recorded, the reading resolution when the template is read by the image reading device is manually input and this input is performed. The incidental information including the resolution is stored and held in association with the template image. The supplementary information may be recorded in the header of an image file in which the template image is recorded, or may be recorded in a script file or the like in association with the image file.

  The implant selection support device according to any one of claims 1 to 7, further comprising a magnification designation unit that designates a magnification of a medical image to be displayed on the display unit. The means is characterized in that the medical image is scaled according to the scaling factor designated by the scaling factor indicating means and displayed on the display means. By changing the scaling factor of the medical image or the like, the entire medical image can be confirmed or the attention location can be enlarged and confirmed.

  The implant selection support device according to any one of claims 1 to 8, as shown in claim 9, wherein a movement instruction means for instructing a parallel movement and a rotation movement of the template image, and an instruction input from the movement instruction means And a movement control means for moving the template image displayed on the display means on the medical image based on the above. Thereby, both images can be compared while moving the template image with respect to the medical image, and it can be determined whether or not the selected template image (implant) is appropriate.

  The implant selection support program according to claim 10 is a transparent image in which a medical image of a patient to which an implant is applied and a supplementary information including at least the resolution of the medical image and a line drawing including an outline of the implant are drawn. A function of acquiring a template image indicating a sheet-like template, a function of storing the acquired template image in association with additional information including at least the resolution of the template image, and an arbitrary template from the stored template image A function for selecting an image, a function for displaying the acquired medical image and the selected template image on the display unit, a function for scaling the medical image and displaying it on the display unit, and the template A function for scaling an image and displaying it on the display means; The resolution on the screen after scaling of the medical image and the resolution of the template image are obtained so that the resolution on the screen of the medical image after scaling and the resolution on the screen of the template image match. It is characterized by having a computer implement the function of scaling the template image.

  According to the present invention, together with a template image obtained by reading a transparent sheet-like template on which an outline of an implant owned by a hospital is drawn by an image reading device such as a scanner, the resolution at the time of reading the template image is associated. When the medical image and the arbitrarily selected template image are displayed in a superimposed manner, the template image is scaled so that the resolutions of both images match based on the resolution of both images. Since it did in this way, a template image can be displayed with a suitable magnitude | size with respect to the displayed medical image, without performing a complicated operation | work, and a suitable template image (implant) can be selected. Moreover, the transparent sheet-like template which a hospital holds can be utilized as it is.

Hereinafter, preferred embodiments of an implant selection support device and a program according to the present invention will be described with reference to the accompanying drawings.
[System configuration]
FIG. 1 is a system configuration diagram of a network system including an implant selection support device according to the present invention.

  This system is mainly composed of an implant selection support device 10 operated by a clinician, a scanner 50, an X-ray imaging device 60, an image database (image DB) 70, and a network 80 such as a hospital LAN connecting them. It is configured.

  The implant selection support device 10 is configured by a personal computer (personal computer), and mainly stores a central processing unit (CPU) 12 that controls the operation of each component, and a control program for the device, and works when the program is executed. The main memory 14 serving as a region, the graphic board 16 for controlling the display of the monitor device 30 such as a liquid crystal display or a CRT display, a communication interface (communication I / F) 18 connected to the network 80, and an operating system of a personal computer ( OS), a device driver of a peripheral device such as a scanner 50 connected to a personal computer, a hard disk device 20 storing various application software including an implant selection support program according to the present invention, a CD-ROM drive 22, a keyboard 2 detects the key operation 2 and outputs it to the CPU 12 as an instruction input, and detects the state of the mouse 34 as the position input device, and signals such as the position of the mouse pointer on the monitor device 30 and the state of the mouse 34 Are output to the CPU 12 and an external interface (external I / F) 28.

  The scanner 50 is provided mainly for reading a transparent sheet-like template on which an outline of an implant owned by a hospital is drawn, and is connected to the implant selection support device 10 via an external I / F 28.

  In addition, the outline which expanded 10% rather than the actual size of the implant is drawn on the template. This is because an X-ray image (medical image) of a subject imaged by the X-ray imaging apparatus 60 is imaged by about 10% larger than the actual object.

  A template image indicating a template read by the scanner 50 is recorded on the hard disk device 20 in a general file format such as BMP (bitmap) or JPG (Joint Photographic Experts Group).

  At this time, the implant selection support device 10 acquires the resolution (for example, 600 dpi (Dot per Inch)) set by the driver of the scanner 50, and records the incidental information including at least the resolution in the header of the image file of the template image. To do.

  Further, by operating the keyboard 32, identification information indicating which implant corresponds to the template image captured from the scanner 50 is input, and a file name including this identification information is attached to the image file. According to this, the implant indicated by the template image can be specified from the file name. Instead of embedding the identification information of the implant in the file name, it may be recorded in the header of the image file.

  Furthermore, the implant selection support apparatus 10 includes a transmission attribute setting unit that sets a transmission attribute indicating that the background portion is transparent in a background portion other than the line drawing indicating the implant in the acquired template image. . As a result, the medical image in the background portion other than the line drawing of the template image can be visually recognized even when the template image is displayed superimposed on the medical image as described later. Details of the transparency attribute setting means will be described later.

  The X-ray imaging apparatus 60 is a digital X-ray imaging apparatus in which a flat panel X-ray detector (FPD) is mounted, and the captured X-ray image (medical image) is, for example, DICOM (Digital Save as an Imaging and Communications in Medicine) image file (DICOM file). The DICOM file tag (DICOM tag) includes personal information such as the patient name, imaging date, imaging facility, imaging site, and Imager Pixel Spacing value (mm / pix) corresponding to the resolution of the detection surface (mm / pix) ( Attached information such as the size of one pixel) is recorded.

  A medical image (DICOM file) imaged by the X-ray imaging apparatus 60 is stored in the image DB 70 via the network 80.

  The image DB 70 stores and manages DICOM files in association with patients, imaging dates and times, imaging sites, and the like.

<Implant selection operation>
FIG. 2 is a diagram showing an example of a monitor screen displayed when selecting an implant, and shows a case where a hip implant is selected.

  A user such as a clinician activates an implant selection support program and operates the implant selection support device 10 when selecting an implant suitable for a patient who needs an artificial joint replacement operation.

  First, the implant selection support apparatus 10 is operated, and a medical image (DICOM file) of a patient is acquired from the image DB 70 by the implant selection support apparatus 10 via the network 8 based on the DICOM communication standard, and the medical image 100 is monitored. It is displayed on the device 30. Further, a desired template image is selected from the template images indicating the implants held in the hard disk device 20 (template image holding means), and the template images 102 and 104 are displayed superimposed on the medical image.

  This hip prosthesis is mainly composed of a stem (stem), a head (bone head), and a cup (acetabular part). The template image 102 shown in FIG. 2 is inserted and fixed in the medullary cavity of the femur. The template image 104 shows a cup that is placed and fixed to the acetabular part of the pelvis.

  A user selects a template image (implant) having a shape and size suitable for a patient while comparing a medical image and a template image on a monitor screen, and makes a preoperative plan for artificial joint replacement surgery.

  In addition, the implant selection support device 10 includes a magnification designation unit that designates a scaling factor of a medical image to be displayed on the monitor device 30. This magnification designation means may be capable of arbitrarily designating the scaling ratio of the medical image, or one that switches the scaling ratio step by step (for example, a window fit scaling ratio that displays the medical image on the display screen of the display means, It may be a variable magnification that enables actual size display) or a combination thereof.

  Further, the implant selection support device 10 is displayed on the monitor device 30 based on the movement instruction means for instructing the parallel movement and the rotation movement of the template image on the screen of the monitor device 30 and the instruction input from the movement instruction means. Movement control means for moving the template image on the medical image.

  The magnification designation means and the movement instruction means include a GUI (Graphical User Interface) screen such as an icon 106 and a window displayed on the monitor screen and a mouse 34 for performing operations such as magnification designation and movement instruction on the GUI screen. And input means of the keyboard 32.

  In addition, the implant selection support device 10 includes a medical image scaling unit that scales the medical image so that a medical image displayed on the monitor device 30 has a scaling factor specified by the scaling factor specifying unit, and scaling. Template image scaling means for scaling the template image so that the resolution of the later medical image on the screen and the resolution of the template image on the screen match is provided.

  Details of the medical image scaling unit and the template image scaling unit will be described later.

<First Embodiment>
FIG. 3 is a functional block diagram showing the first embodiment of the implant selection support device 10 according to the present invention.

  In FIG. 3, the medical image acquisition unit 200 corresponds to the communication I / F 18 shown in FIG. 1, and takes in a medical image (DICOM file) of a patient from the image DB 70. In the DICOM tag of this DICOM file, incidental information including the resolution (mm / pix) of the medical image is recorded.

  The medical image scaling unit 210 scales the acquired medical image so that the scaling factor specified by the scaling factor specifying unit is obtained. For example, when the window fit scaling factor is set, the image size (number of pixels) of the medical image is 4000 × 3000 pixels, and the number of pixels in the medical image display area of the monitor device 30 is 1200 × 900 pixels, The medical image is reduced to 3/10 (magnification factor = 30%). Note that when the image pixel and the monitor pixel have a one-to-one correspondence, the scaling factor is 100%. Further, when displaying an actual size image of a medical image on the monitor screen, the medical image is scaled by using a ratio between the screen resolution (display resolution) of the monitor device 30 and the resolution of the medical image as a scaling factor. For example, when the resolution of the medical image and the screen resolution of the monitor device 30 match, if the medical image is displayed at a scaling factor of 100%, the actual size image of the medical image can be displayed on the monitor screen. it can.

  On the other hand, the template image holding means 220 corresponds to the hard disk device 20 shown in FIG. A desired template image is selected from the template images indicating the implants held in the template image holding means 220, and accompanying information including the resolution of the template image is captured along with the template image.

  The template image scaling unit 230 acquires the resolution on the screen of the medical image after scaling that has been scaled by the medical image scaling unit 210, and converts the template image to match the resolution on the screen of the medical image. Zoom in. That is, the template image scaling unit 230 scales the template image using the ratio between the resolution of the medical image after scaling and the resolution of the template image as a scaling factor.

  The resolution of the medical image on the screen can be obtained by multiplying the resolution of the original medical image by the scaling factor when displayed on the monitor device 30.

  Further, the template image scaling unit 230 needs to perform conversion to match the resolution unit when the resolution of the medical image acquired as the supplementary information does not match the resolution unit of the template image. For example, when the resolution unit of the medical image is the size of one pixel (mm / pix) and the resolution unit of the template image is the number of dots per inch (25.4 mm) (dpi), both Set the resolution unit to one of the units.

  Furthermore, when the medical image is appropriately scaled by the medical image scaling unit 210, the template image scaling unit 230 scales the template image in accordance with the scaling factor of the medical image to obtain the resolution on the screen of the medical image. Always match the resolution of the template image on the screen. Note that by changing the magnification of a medical image or the like, it is possible to check the entire medical image or to enlarge and check a point of interest.

  The medical image scaled by the medical image scaling unit 210 as described above and the template image scaled by the template image scaling unit 230 are displayed superimposed on the monitor device 30. Since the resolution of the medical image on the monitor screen matches the resolution of the template image, the size of both images can be appropriately compared and determined, and a template image (implant that is suitable for the patient) ) Can be selected.

<Second Embodiment>
FIG. 4 is a functional block diagram showing a second embodiment of the implant selection support device 10 according to the present invention. In addition, the same number is attached | subjected to the part which is common in FIG. 3, and the detailed description is abbreviate | omitted.

  As shown in FIG. 4, the second embodiment is different from the first embodiment shown in FIG. 3 in that a transparent attribute setting unit 240 is provided.

  The transparency attribute setting unit 240 recognizes a pixel having a luminance value larger than a predetermined threshold value (a threshold value for binarization) of the template image as a background part, and sets a transparency attribute to the background part. That is, since the background portion of the template in which the outline of the implant is drawn on a transparent sheet is transparent, the template image obtained by reading this template with a scanner has the luminance value of the background portion as the luminance value of the line drawing. Is bigger than. Therefore, the background portion of the template image can be easily extracted by threshold processing. Of course, the background portion may be recognized by other recognition processes.

  Further, the setting of the transparency attribute of the background portion of the template image can be set by the α channel. The α channel is a data area for storing the transparency information set for each pixel separately from the image data, and the transparency information (alpha value) can be set from transparent (colorless) to opaque. In this embodiment, the background portion is set to a transparent alpha value.

  As a result, the monitor device 30 displays the template image superimposed on the medical image, but the background portion other than the line drawing of the template image becomes transparent, so that the medical image may not be visible due to the background portion of the template image. Therefore, it is possible to satisfactorily compare the template image and the medical image.

  Note that the template image may be displayed with a specific density (white or black) or a specific color regardless of the density or color of the line drawing of the implant drawn on the template. According to this, it is possible to easily identify the template image and the medical image.

<Modification>
In this embodiment, the implant selection support apparatus 10 does not include the scanner 50, but may be configured to include the scanner 50. The medical image is not limited to the DICOM format, and is not limited to being acquired through the network 80, but may be acquired through the external I / F 28, the CD-ROM drive 22, or the like.

  Further, the template image is not limited to the case of directly capturing from the scanner 50, and the template image that has been read in advance by an image reading device such as a scanner and recorded on a recording medium such as a CD-ROM is sent via the recording medium. You may make it acquire.

  Further, when the resolution at the time of taking a medical image is not recorded as tag information, it is necessary to input the resolution by manual operation.

  In this embodiment, the incidental information including the resolution of the medical image and the template image is recorded as tag information in the header of the image file. However, the present invention is not limited thereto, and is recorded in association with the image file in a script file or the like. You may make it do.

  Further, the present invention is not limited to the case of selecting the hip joint implant shown in the embodiment, and can be applied to the case of selecting an implant to be applied to, for example, the elbow, knee, and shoulder.

  Furthermore, the present invention is not limited to the above examples, and it goes without saying that various improvements and modifications may be made without departing from the scope of the present invention.

FIG. 1 is a system configuration diagram of a network system including an implant selection support device according to the present invention. FIG. 2 is a diagram illustrating an example of a monitor screen displayed when an implant is selected. FIG. 3 is a functional block diagram showing a first embodiment of an implant selection support device according to the present invention. FIG. 4 is a functional block diagram showing a second embodiment of an implant selection support device according to the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Implant selection assistance apparatus, 12 ... Central processing unit (CPU), 14 ... Main memory, 18 ... Communication interface, 20 ... Hard disk apparatus, 30 ... Monitor apparatus, 32 ... Keyboard, 34 ... Mouse, 50 ... Scanner, 60 ... X-ray imaging apparatus, 70 ... image database, 100 ... medical image, 102, 104 ... template image, 200 ... medical image acquisition means, 210 ... medical image scaling means, 220 ... template image holding means, 230 ... template image scaling Means 240 ... Transparent attribute setting means

Claims (10)

Medical image acquisition means for acquiring a medical image of a patient to which an implant is applied and additional information including at least the resolution of the medical image;
A template image acquisition means for acquiring a template image indicating a transparent sheet-like template in which a line drawing including an outline of the implant is drawn;
Storage means for storing the acquired template image and associated information including at least the resolution of the template image in association with each other;
Template image selection means for selecting an arbitrary template image from the template images stored in the storage means;
Display means for superimposing and displaying the acquired medical image and the selected template image;
A medical image scaling means for scaling the medical image and displaying it on the display means;
A template image scaling unit that scales the template image and displays the template image on the display unit, obtains the resolution on the screen after scaling of the medical image and the resolution of the template image, and after the scaling Template image scaling means for scaling the template image so that the resolution of the medical image on the screen matches the resolution of the template image on the screen;
An implant selection support device comprising:   2. The template image scaling unit according to claim 1, wherein the template image scaling unit scales the template image using a ratio between a resolution of the medical image after scaling and the resolution of the template image as a scaling factor. Implant selection support device.   The transmission attribute setting means which sets the transmission attribute which shows that this background part is transparent to background parts other than the line drawing which shows the said implant of the said template image is further provided. The implant selection assistance apparatus described in 1.   The implant selection support apparatus according to any one of claims 1 to 3, wherein incidental information including a resolution of the medical image is added to the medical image as tag information.   5. The template image acquisition means takes in the template image from an image reading apparatus that reads the template, or takes in from an external storage means that stores the template image output from the image reading apparatus. The implant selection assistance apparatus in any one of. To the template image, additional information including the resolution at the time of reading the template with the image reading device is added as tag information,
The implant selection support device according to claim 5, wherein the storage unit stores a template image to which the tag information is added. A resolution input means for manually inputting a resolution at the time of reading the template in the image reading apparatus;
The implant selection support according to claim 5, wherein the storage unit stores the resolution input by the resolution input unit in association with the template image together with the template image acquired by the template image acquisition unit. apparatus. A magnification designating unit for designating a display magnification of the medical image displayed on the display unit;
8. The medical image scaling unit according to claim 1, wherein the medical image is scaled according to a scaling factor designated by the magnification instruction unit and displayed on the display unit. 9. Implant selection support device.   Movement instruction means for instructing parallel movement and rotation movement of the template image, and movement control means for moving the template image displayed on the display means on the medical image based on an instruction input from the movement instruction means; The implant selection assisting device according to any one of claims 1 to 8, further comprising: A function of acquiring a medical image of a patient to which the implant is applied and incidental information including at least the resolution of the medical image;
A function of obtaining a template image showing a transparent sheet-like template in which a line drawing including an outline of the implant is drawn;
A function of storing the acquired template image and associated information including at least the resolution of the template image in association with each other;
A function of selecting an arbitrary template image from the stored template images;
A function of superimposing the acquired medical image and the selected template image on a display means;
A function of scaling the medical image and displaying it on the display means;
A function of scaling the template image and displaying the template image on the display unit, obtaining a resolution on the screen after scaling of the medical image and a resolution of the template image, and obtaining the resolution of the medical image after scaling A function of scaling the template image so that the resolution on the screen and the resolution on the screen of the template image match;
An implant selection support program characterized by causing a computer to execute the above.

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