JP2011141402A - Simulation device for ultrasonic diagnosis education - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable simulation device for ultrasonic diagnosis education that simulates ultrasonic diagnosis in the actual body posture and gives the same feeling as in the actual ultrasonic diagnosis. <P>SOLUTION: The simulation device for ultrasonic diagnosis education includes: a hollow human upper-body model containing a magnetic sensor for detecting magnetism in a predetermined position of the chest and/or the abdomen and which is provided with a light emitting section for emitting light; a pseudo probe which has a magnet, a pressure-sensitive sensor for detecting pressure, a gyro sensor for detecting a rotation angle, a light receiving part for detecting light, and a triaxial sensor for detecting an inclination angle inside; a storage part for storing real plane image data of echocardiography and/or abdominal ultrasonography; a calculation part for calculating a spatial position of the pseudo probe based on the information transmitted from each sensor, and reading the real plane image data corresponding to the spatial position of the pseudo probe from the storage part; and a display part for displaying plane image data. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an educational simulation apparatus for learning an abdominal ultrasound diagnostic method and a transthoracic heart ultrasound diagnostic method.

  Currently, ultrasound diagnostic devices are the most commonly used for diagnosing heart and abdominal diseases, but doctors and laboratory technicians can operate ultrasound diagnostic devices to perform inspections and perform accurate ultrasound diagnosis. A lot of training and experience is required before it can be done. In particular, skilled techniques are required to operate the ultrasonic probe, and the operator must take an image while finely adjusting the position, angle, contact pressure, and the like of applying the ultrasonic probe to the specimen.

  On the other hand, ultrasonic diagnostic apparatuses are sophisticated and expensive, and in addition, it is difficult to obtain a specimen having a predetermined heart disease or built-in disease. Furthermore, since an ultrasonic diagnostic image is a reflection image unlike a transmission image, learning and experience are required for reading. Therefore, in the field of medical education, instead of an ultrasonic diagnostic device that is actually used, Educational simulation devices tend to be used more and more.

By the way, as an indispensable technical element in the educational simulation apparatus for ultrasonic diagnosis, there is an ultrasonic probe position detection technique.
For this position detection technique, a spatial position sensor is used. As a conventional spatial position sensor, for example, there is a magnetic spatial sensor using magnetism. This magnetic space sensor uses the principle that an electromotive force is generated in a coil due to a change in magnetic flux. However, there are disadvantages such as an expensive device, and if there is a magnetic substance in the vicinity, it immediately leads to an error. is there.

Against this background, an educational simulation apparatus related to ultrasonic diagnosis that does not rely on a magnetic space sensor has been proposed. For example, there is a technique disclosed in JP-A-2002-336247.
This technology relates to the name of the invention “image display apparatus and image display method” and solves the problem of “providing an image display apparatus capable of performing operation training with the same feeling as in actual ultrasonic diagnosis”. "The pseudo probe that has the shape imitating the ultrasonic probe and is used to indicate the display range of the image, and the contact position of the pseudo probe that has the shape imitating the human body surface for contacting the pseudo probe. Corresponds to the range calculated by the pseudo-body table to be detected, the image memory for storing the three-dimensional image data inside the human body, the display range calculation unit for calculating the range of the tomographic image of the human body to be displayed, and the range calculated by the display range calculation unit A configuration that includes an echo signal generation unit and a signal processing unit that generate an image signal, and a display unit that displays an image based on the generated image signal. The case, the inclination detecting means for detecting an inclination with respect to pseudo-body surface of the pseudo-probe relies light emitting diode provided in pseudo-probe, to a stereo television camera for photographing the light emitted from the light emitting diode.

  By the way, the technique disclosed in Japanese Patent Application Laid-Open No. 2002-336247 is intended for the liver, kidney, spleen, and the like that can be ultrasonically diagnosed from the abdomen. Therefore, this technology cannot be used as it is in an echocardiographic diagnosis education apparatus. In addition, a light emitting diode and a stereo TV camera are used as position detection sensors, and the stereo TV camera is not included in an actual ultrasonic diagnostic apparatus, and the apparatus is relatively large. It is what you have.

  Therefore, the applicant of the present application is an ultrasonic diagnostic simulation apparatus for the heart, which can perform simulation with the same feeling as in actual ultrasonic diagnosis, and can accurately and accurately determine the position and inclination of the pseudo probe. A technology aimed at providing an echocardiographic diagnosis and education apparatus that is well understood and excellent in portability has been developed, and this technology is disclosed in Japanese Patent No. 4679379.

  The technology disclosed in Japanese Patent No. 4679379 is related to the title “Echocardiography Educational Device”, and is an “ultrasound diagnostic simulation device for the heart, which performs simulation with the same feeling as in actual ultrasonic diagnosis. The purpose is to provide an echocardiographic education and education device that can be performed ", and in order to solve this problem," an echocardiographic education and education device is a human body model in which a position sensor is embedded at a predetermined position on the body surface of the chest. A pseudo probe including a pressure sensor including a magnet and having at least three pressure sensitive elements at the tip, a storage unit for storing echocardiographic stereoscopic image data, and a pseudo probe based on information from each sensor A calculation unit that calculates the position, inclination, and pressing force of the image, and extracts the plane image data from the stereoscopic image data based on the calculation, and the extracted plane image data The are a display unit for displaying a planar image, and comprising configuration 'from.

JP 2002-336247 A Japanese Patent No. 4679379

  However, in the technology disclosed in Japanese Patent No. 4679379, the echocardiographic image stored in the storage unit is a stereoscopic image, and a plane image is cut out from the stereoscopic image by the arithmetic unit in accordance with the scanning of the pseudo probe, and the display unit To be displayed.

  The 3D image stored in the storage unit can be easily cut out and displayed as a flat image, and can be freely cut out into a flat image as a feature of the 3D image. It was not necessary to collect the spatial position information of the actual ultrasonic probe when capturing the echo image by scanning. On the other hand, there has been a problem in that color Doppler display and cardiac function measurement, which are indispensable elements for the ultrasonic diagnostic imaging technique, cannot be performed due to a reduction in image resolution when extracting a planar image from a stereoscopic image.

  Therefore, the present invention can perform a simulation with the same feeling as well as an ultrasonic diagnosis education simulation apparatus for the heart and other organs in the same posture as that of the actual human body in the actual ultrasonic diagnosis. An object of the present invention is to provide an apparatus that can be performed and has excellent portability and does not reduce image resolution.

To achieve the above object, a simulation apparatus for ultrasonic diagnostic education according to claim 1 of the present application is a human body model in which a magnetic sensor for sensing magnetism is embedded at a predetermined position on the body surface of the chest and / or abdomen and emits light. A hollow upper body human body model that has a side light emitting unit or a human model side light receiving unit that senses light, a pressure sensor and a magnet that detect the pressing force against the human model at the tip, and a rotation angle is detected inside An actual ultrasonic wave comprising: a gyro sensor that detects light, a probe-side light-receiving unit that senses light from the human-body-model-side light-emitting unit, or a probe-side light-emitting unit that emits light to the human-model-side light-receiving unit; A pseudo probe that imitates a probe, a storage unit that stores planar image data of echocardiogram and / or abdominal echo, and the pressure sensor detects pressure, Information on the position of the pseudo probe on the human body model detected by the magnetic sensor, information on the rotation reference position of the pseudo probe detected by the human body model side light receiving unit or the probe side light receiving unit, and the gyro sensor detects Obtain information on the relative rotation angle of the pseudo probe and information on the tilt angle of the pseudo probe detected by the three-axis sensor, calculate the spatial position of the pseudo probe with respect to the human body model, and store it in the storage unit. A calculation unit that reads the plane image data corresponding to the spatial position of the pseudo probe from the stored plane image data, and a display unit that displays the read plane image data. It is said.
An ultrasonic diagnostic education simulation apparatus according to claim 2 of the present application is the ultrasonic diagnosis education simulation apparatus according to claim 1, wherein the pressure sensor, magnetic sensor, gyro sensor, triaxial sensor, human body Information detected by the model-side light-receiving unit or the probe-side light-receiving unit (hereinafter collectively referred to as “each sensor”) is divided into information for each sensor by the control unit and sent to the calculation unit. It is characterized by.
The ultrasonic diagnostic education simulation apparatus according to claim 3 of the present application is the ultrasonic diagnosis education simulation apparatus according to claim 1 or 2, wherein the human body model side light emitting unit or the human body model side light reception is provided. The unit is fixed to the head side of the human body model, and the human body model side light emitting unit or the probe side light emitting unit emits a modulated infrared ray.
Furthermore, an ultrasonic diagnostic educational simulation apparatus according to claim 4 of the present application is the ultrasonic diagnostic educational simulation apparatus according to any one of claims 1 to 3, wherein the planar image data is actually obtained on a specimen. Corresponding echocardiographic image data and / or abdominal echo image data picked up by scanning with an ultrasonic probe and spatial information including planar position information, rotation angle information, and tilt angle information of the actual ultrasonic probe with respect to the specimen. And stored in the storage unit.
An ultrasonic diagnostic educational simulation apparatus according to claim 5 of the present application is the ultrasonic diagnostic educational simulation apparatus according to claim 4, wherein the echocardiographic image data and / or the abdominal echo image data are captured for a predetermined time. The moving image data or the still image data.
An ultrasonic diagnostic education simulation apparatus according to claim 6 of the present application is the ultrasonic diagnostic education simulation apparatus according to any one of claims 1 to 5, wherein the display unit includes the planar image data. In addition, a schema based on the planar image data is displayed.

By the above solution, the present invention has the following effects.
(1) As a sensor for detecting the position of the pseudo probe, the present invention provides a magnetic sensor and a light emitting unit (human body side light emitting unit or probe side light emitting unit) embedded in a predetermined position of the human body model and a light receiving unit (human body side). The photosensor includes a light receiving unit or a probe-side light receiving unit. Since the magnetic sensor is extremely small, it can be embedded at a position corresponding to a location required for actual ultrasonic diagnosis, and operates regardless of the position and orientation of the human body model. Furthermore, the photosensor for detecting the reference position of the pseudo probe also operates regardless of the position and orientation of the human body model because the light emitting unit that emits light is provided in the human body model. Therefore, it is not necessary to hold the human body model in the supine position, and the position and orientation required for actual ultrasonic diagnosis such as the lateral position or the sitting position can be obtained. The same effect can be obtained when the light emitting unit is provided in the pseudo probe.
(2) Each sensor (pressure sensor, gyro sensor, photosensor consisting of a light emitting part and a light receiving part, and a three-axis sensor) built in the pseudo probe and a small control circuit are used. Therefore, a pseudo probe having a shape, mass, and the like mimicking that of an actual ultrasonic probe can be obtained.
(3) Planar image data is real image data of an echocardiogram and / or an abdominal echo image captured by scanning the real ultrasonic probe on the specimen, and the storage unit correlates the spatial information of the real ultrasonic probe at that time Since the echocardiogram and / or the abdominal echo image displayed on the display unit by operating the pseudo probe is a real image, a clear image is displayed without a reduction in image resolution. In addition, by using real image data as moving image data, color Doppler display and cardiac function measurement (in the case of echocardiography) essential for ultrasonic image diagnosis can be performed.
(4) In an actual ultrasonic diagnostic apparatus, it is not easy for beginners and skilled workers to read which part of the plane image displayed on the display unit is an image. By displaying the plane image data and a schema (line drawing or deformed figure) based on the plane image data on the display unit, it is easy to read predetermined information, and it is also easy to learn a plane image reading technique in ultrasonic diagnosis. .

It is a schematic diagram of the simulation apparatus for ultrasonic diagnosis education which concerns on an Example. It is a block diagram of the simulation apparatus for ultrasonic diagnosis education which concerns on an Example. It is detection item explanatory drawing of each sensor of the ultrasonic diagnostic educational simulation apparatus which concerns on an Example. It is an image display flowchart figure of the simulation apparatus for ultrasonic diagnosis education which concerns on an Example. It is an imaging method explanatory drawing used as echocardiogram image data and / or abdominal echo image data.

  Hereinafter, an embodiment according to an embodiment for carrying out the present invention will be described with reference to FIGS. 1 to 3 and FIG. 5, reference numeral 1 is an ultrasonic diagnostic educational simulation apparatus according to the embodiment, reference numeral 10 is a human body model, reference numeral 11 is a magnetic sensor, reference numeral 13 is a human body model side light emitting unit, reference numeral 15. Is a control unit, 30 is a pseudo probe, 31 is a magnet, 33 is a pressure sensor, 35 is a gyro sensor, 37 is a probe-side light receiving unit, 39 is a triaxial sensor, 41 is a control circuit, Reference numeral 50 denotes a personal computer, reference numeral 51 denotes a display unit, reference numeral 53 denotes a calculation unit, reference numeral 55 denotes a storage unit, reference numeral 61 denotes a sample, reference numeral 63 denotes an actual ultrasonic probe, reference numeral 65 denotes a position detection sensor unit, and reference numeral 67 denotes infrared rays. A light emitter.

  First, the configuration and operation of the ultrasonic diagnostic education simulation apparatus 1 according to the embodiment will be described with reference to FIGS. 1 to 4. In the description of the positional relationship of the pseudo probe, the direction across the human body model is defined as the X axis. And the direction perpendicular to the X-axis and the direction perpendicular to the X-axis and the direction perpendicular to the X-axis and the Y-axis, that is, the direction perpendicular to the human-body model is described as the Z-axis. .

  The ultrasonic diagnostic education simulation apparatus 1 mainly includes a human body model 10, a pseudo probe 30, and a personal computer 50.

  The human body model 10 imitates the upper body including the head, has a hollow casing, and is made of a synthetic resin having elasticity. A plurality of magnetic sensors 11, a human body model side light emitting unit 13, and a control unit 15 are installed in the housing of the human body model 10.

  The magnetic sensor 11 is a position sensor that detects the magnetism of the magnet 31 built in the pseudo probe 30, and is arranged at each of the predetermined positions where the actual ultrasonic probe is actually pressed when performing an ultrasonic diagnosis. The body model 10 is fixed to the inner surface of the housing wall corresponding to the chest and abdomen. Then, when the magnetic sensor 11 sends the magnetic sensing information of the magnet 31 to the calculation unit 53 described later, the calculation unit 53 uses the X axis and the Y axis which are positions on the plane of the pseudo probe 30 with respect to the human body model 10 as coordinate axes. A position (x, y) on the coordinates is acquired.

  The human body model side light emitting unit 13 is installed on the lower jaw of the human body model 10 and emits infrared light that is modulated and diffused to 38 kHz toward the chest, and an infrared LED is used as the light source. Yes. The human body model side light emitting unit 13 may be installed at any position where it can receive light emitted by a probe side light receiving unit 37 described later. For example, when used in the supine position, it is installed near the shoulder. Good.

  The control unit 15 divides each data sent from the magnetic sensor 11, the pressure sensor 33, the gyro sensor 35, the probe side light receiving unit 37, and the triaxial sensor 39 into information for each sensor, and I have a role to send.

  The pseudo probe 30 imitates the shape of an actual ultrasonic probe. The pseudo probe 30 includes a pressure-sensitive sensor 33 and a magnet 31 at the tip, and a gyro sensor 35 and a probe-side light receiving unit 37 and a triaxial one of photo sensors. A sensor 39 is incorporated.

The pressure-sensitive sensor 33 is at the tip of the pseudo probe 30 and detects the pressing force (Pz) in the central axis direction of the pseudo probe 30 when pressed against the human body model 10. The gyro sensor 35 detects the relative rotation angle of the pseudo probe 30, and the probe-side light receiving unit 37 detects the infrared rays emitted from the human-model-side light emitting unit 13, thereby detecting the pseudo probe for the human model 10. A reference rotation angle of 30 is detected. The triaxial sensor 39 detects the inclination angle of the pseudo probe 30, that is, the inclination with respect to the X axis (Gx), the inclination with respect to the Y axis (Gy), and the inclination with respect to the Z axis (Gz).
The light receiving unit may be installed on the human body model 10 to serve as the human body model side light receiving unit, and the light emitting unit may be installed on the pseudo probe 30 side to serve as the probe side light emitting unit. It is the same as the side light receiving unit 37, and the role of the probe side light emitting unit is the same as that of the human body model side light emitting unit.

  Then, the pressing force (Pz) detected by each of the pressure-sensitive sensor 33, the gyro sensor 35, the probe-side light receiving unit 37, and the three-axis sensor 39, a relative rotation angle, a reference rotation angle, and an inclination with respect to the X axis ( Gx), the inclination (Gy) with respect to the Y axis, and the inclination (Gz) with respect to the Z axis are sent to the control unit 15 via the control circuit 41.

The personal computer 50 includes a display unit 51, a calculation unit 53, and a storage unit 55.
The storage unit 55 stores real image data of an echocardiogram image and / or an abdominal echo image captured by scanning the real ultrasonic probe on the specimen, and data (x, y) of the position of the real ultrasonic probe. , Rotation angle data (Jθ) and inclination data (Gx, Gy, Gz) with respect to the X, Y, and Z axes. The calculation unit 53 is calculated from the position data (x, y) of the pseudo probe 30 sent from each sensor installed on the human body model 10 and the pseudo probe 30, the relative rotation angle, and the reference rotation angle. The real image data corresponding to the plane image data is selected from the storage unit 55 from the absolute rotation angle (Jθ) and the inclination (Gx, Gy, Gz) with respect to each axis, and the plane image data is displayed. The image is sent to the unit 52 and displayed as a planar image.

  When displaying the plane image data, a schema with each data of the pseudo probe 30 corresponding to the plane image is displayed. This schema is also stored in the storage unit 55.

  Next, a usage example of the ultrasonic diagnostic education simulation apparatus 1 according to the embodiment will be described in order based on FIG.

(1) When the ultrasonic diagnostic education simulation apparatus 1 is turned on and the artificial probe 33 is pressed against the human body model 10 and pressed, the calculation unit 53 pushes the pseudo probe 30 sent from the pressure sensor 33 (Pz). If a signal is detected and the pressing force (Pz) is equal to or greater than a predetermined value, the ultrasonic diagnostic education simulation apparatus 1 is activated (step S1).

(2) The computing unit 53 detects which one of the plurality of magnetic sensors 11 is a signal sent from the magnetic sensor 11, and acquires the position data (x, y) of the pseudo probe 30 (step S2). .

(3) Further, the calculation unit 53 acquires absolute rotation angle data (Jθ) for the human body model 10 of the pseudo probe 30 from the signals of the gyro sensor 35 and the probe-side light receiving unit 37 (step S3), and The inclination data (Gx, Gy, Gz) of the pseudo probe 30 is acquired by detecting the signal of the triaxial sensor 39 (step S4).

(4) The calculation unit 53 reads from the storage unit 55 based on the spatial position data of the pseudo probe 30 including (x, y), (Jθ), and (Gx, Gy, Gz) data of the acquired pseudo probe 30. Select the corresponding planar image data. That is, the calculation unit 53 compares the data (x, y), (Jθ), and (Gx, Gy, Gz) sent from each sensor installed on the human body model 10 and the pseudo probe 30 with the actual image data. Thus, the matching actual image data is selected from the storage unit 55 (step S5).

(5) Further, the calculation unit 53 selects a schema corresponding to the actual image data selected in step S5 from the storage unit 55 and causes the display unit 52 to display the schema (step S6).

(6) When the use of the ultrasonic diagnostic education simulation apparatus 1 is terminated, the power may be turned off. However, when the use is continued, the process returns to Step 1 (Step S7), and the predetermined location is set to the pseudo probe 30. When the pressure is pressed, the calculation unit 53 detects a pressing force (Pz) signal of the pseudo probe 30 sent from the pressure sensor 33 (step S1).

  Since the planar image displayed on the display unit 52 is a moving image with a time axis, cardiac function measurement can be performed in the case of color Doppler display and echocardiographic diagnosis.

  Next, an imaging method of echocardiographic image data and / or abdominal echo image data will be described with reference to FIG.

  When imaging echocardiographic image data and / or abdominal echo image data, an actual ultrasonic probe 63 attached with a position detection sensor unit 65 is pressed against a predetermined position of the specimen 61 and infrared light is emitted to the head side of the specimen 61. A device 67 is installed, and infrared light is emitted from the infrared light emitter 67 toward the lower half of the body so that the position detecting sensor unit 65 receives the infrared light. The position detection sensor unit 65 includes a light receiving unit that detects a rotation angle that is a reference of the actual ultrasonic probe 63 by sensing infrared rays emitted from the infrared light emitter 67, and a relative position of the actual ultrasonic probe 63. A gyro sensor for detecting a typical rotation angle is incorporated. The actual ultrasonic probe 63 is connected to a personal computer (not shown) via an ultrasonic diagnostic apparatus (not shown), and the position detection sensor unit 65 is connected to the personal computer.

When an examination engineer related to ultrasound diagnosis operates the actual ultrasound probe 63, the captured echocardiographic image data and / or abdominal echo image data is a pressing force (Pz) in the central axis direction of the actual ultrasound probe 63. And the tilt angle of the actual ultrasonic probe 63, that is, the tilt (Gx) with respect to the X-axis, the tilt (Gy) with respect to the Y-axis, and the tilt (Gz) with respect to the Z-axis are recorded in the personal computer. Further, the reference rotation angle and the relative rotation angle of the actual ultrasonic probe 63 acquired by the position detection sensor unit 65 are sent to the personal computer and the absolute rotation of the actual ultrasonic probe 63 with respect to the specimen 61 is absolute. The angle is calculated, and the absolute rotation angle data and the predetermined location data of the real ultrasonic probe 63 are recorded in advance (the echo echo image data and / or the abdominal echo image data and the push of the real ultrasonic probe 63). The data is recorded on the personal computer in synchronism with the pressure and tilt angle data.
These recorded data are taken into the storage unit 55 of the personal computer 50.

DESCRIPTION OF SYMBOLS 1 Simulation apparatus for ultrasonic diagnosis education according to an embodiment 10 Human body model 11 Magnetic sensor 13 Human body model side light emitting unit 15 Control unit 30 Pseudo probe 33 Pressure sensor 35 Gyro sensor 37 Probe side light receiving unit 39 Triaxial sensor 50 Personal computer 51 Display unit 53 Calculation unit 55 Storage unit

Claims (6)

A hollow upper body model including a human body model-side light emitting unit that emits light and a human body model-side light receiving unit that senses light, with a magnetic sensor that senses magnetism embedded in a predetermined position on the body surface of the chest and / or abdomen When,
A gyro sensor for detecting a rotation angle inside, a probe side light receiving unit for detecting light of the human body model side light emitting unit, or the human body model side, including a pressure sensitive sensor and a magnet for detecting a pressing force on the human body model at a tip portion A pseudo-probe imitating a real ultrasonic probe comprising a probe-side light emitting unit that emits light to the light receiving unit, and a three-axis sensor that detects an inclination angle;
A storage unit for storing planar image data of echocardiogram and / or abdominal echo;
Information on the position of the pseudo probe detected by the magnetic sensor on the human body model when the pressure sensor detects a pressing force, the pseudo probe detected by the human body model side light receiving unit or the probe side light receiving unit Information on the rotation reference position, information on the relative rotation angle of the pseudo probe detected by the gyro sensor, and information on the tilt angle of the pseudo probe detected by the three-axis sensor, and A calculation unit that calculates a spatial position of the pseudo probe and reads the planar image data corresponding to the spatial position of the pseudo probe from the planar image data stored in the storage unit;
An ultrasonic diagnostic education simulation apparatus comprising: a display unit configured to display the read plane image data.   Information detected by the pressure sensor, magnetic sensor, gyro sensor, triaxial sensor, human body side light receiving unit or probe side light receiving unit (hereinafter collectively referred to as “each sensor”) is controlled by the control unit. The ultrasonic diagnostic education simulation apparatus according to claim 1, wherein the simulation apparatus is divided into information for each sensor and sent to the calculation unit.   The human body model side light emitting unit or the human body model side light receiving unit is fixed to a head side of the human body model, and the human body model side light emitting unit or the probe side light emitting unit emits modulated infrared rays. The ultrasonic diagnostic education simulation apparatus according to claim 1 or 2.   The planar image data includes echocardiographic image data and / or abdominal echo image data captured by scanning a real ultrasonic probe on the specimen and planar positional information, rotation angle information, and tilt angle of the real ultrasonic probe with respect to the specimen. The ultrasonic diagnostic education simulation apparatus according to any one of claims 1 to 3, wherein spatial information including information is stored in the storage unit in association with the spatial information.   The ultrasonic diagnostic education simulation apparatus according to claim 4, wherein the echocardiographic image data and / or abdominal echo image data is moving image data or still image data captured for a predetermined time.   6. The ultrasonic diagnostic education simulation apparatus according to claim 1, wherein a schema based on the planar image data is displayed together with the planar image data on the display unit.

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