JP5802421B2 - diagnostic imaging system - Google Patents

diagnostic imaging system Download PDF

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JP5802421B2
JP5802421B2 JP2011092561A JP2011092561A JP5802421B2 JP 5802421 B2 JP5802421 B2 JP 5802421B2 JP 2011092561 A JP2011092561 A JP 2011092561A JP 2011092561 A JP2011092561 A JP 2011092561A JP 5802421 B2 JP5802421 B2 JP 5802421B2
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magnetic field
field generator
measurement
distance
measurement points
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JP2012223300A (en
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孝則 平井
孝則 平井
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株式会社日立メディコ
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The present invention uses a volume data of an object imaged by an image diagnostic apparatus such as an ultrasonic diagnostic apparatus, a magnetic resonance imaging (MRI) apparatus or an X-ray computed tomography (X-ray CT) apparatus, and scans an ultrasonic image. The present invention relates to a diagnostic imaging system that displays a reference image having the same cross section as the above.

  In an image diagnostic system that displays an ultrasound image and a reference image, a magnetic field generator that generates a magnetic field is installed near the subject. A position sensor for detecting the three-dimensional position and inclination of the ultrasonic probe is attached to the ultrasonic probe. The three-dimensional position information (position and inclination) of the ultrasonic probe is detected by a position sensor based on a magnetic signal generated in a three-dimensional space from the magnetic field generator. Based on the position information detected by the position sensor, a reference image having the same cross section as the scan surface of the ultrasonic image is cut out from the volume data and displayed. (For example, Patent Document 1).

JP 10-151131 A

  However, when an obstacle that affects the magnetic field, such as a magnetic substance, is present near the position sensor or the magnetic field generator, the position measurement reliability of the position sensor is lowered and it is difficult to obtain accurate position information. In the diagnostic imaging system, the cross section between the ultrasonic image projected by the ultrasonic examination in real time and the reference image cut out from the volume data is shifted, and the cross-section display support function may be impaired.

An object of this invention is to provide the diagnostic imaging system which can grasp | ascertain the magnetic field state of a magnetic field generator and can improve a magnetic field state.

In order to solve the problems of the present invention, a volume that includes a magnetic field generator that generates a magnetic field and a position sensor that detects position information based on a magnetic signal of the magnetic field generator, and is previously imaged by an image diagnostic apparatus based on the position information In an image diagnostic system that extracts a reference image having the same cross section as the scan plane of an ultrasonic image configured in real time from the data and displays the reference image on a display unit, the image diagnosis system includes a plurality of measurement points for measuring the magnetic field of the magnetic field generator. A magnetic field measurement tool, a magnetic field generator distance calculation unit for calculating a distance between the measurement point and the magnetic field generator from position information of the measurement point measured by the position sensor, and the magnetic field generator distance A determination unit that determines a magnetic field state of the magnetic field generator based on a distance between the measurement point calculated by the calculation unit and the magnetic field generator; The determination unit compares the distance between the measurement point calculated by the magnetic field generator distance calculation unit and the magnetic field generator and a predetermined appropriate distance range, thereby determining the magnetic field state of the magnetic field generator. judge.
Furthermore, each measurement point in the magnetic field measurement jig is provided with a recess corresponding to the size of the ultrasonic probe. Or the said display part displays the measurement point used as the factor that the magnetic field state of the said magnetic field generator is unsatisfactory.

Further, a magnetic field measurement jig having a plurality of measurement points for measuring the magnetic field of the magnetic field generator, and a distance between the measurement points adjacent from the position information of the measurement points measured by the position sensor And a determination unit that determines the magnetic field state of the magnetic field generator based on the distance between the adjacent measurement points calculated by the measurement point distance calculation unit. The determination unit compares the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit with the distance between actual measurement points in the magnetic field measurement jig. Determine the magnetic field state.
Furthermore, each measurement point in the magnetic field measurement jig is provided with a recess corresponding to the size of the ultrasonic probe. Or the said display part displays the measurement point used as the factor that the magnetic field state of the said magnetic field generator is unsatisfactory.

  ADVANTAGE OF THE INVENTION According to this invention, while grasping | ascertaining the magnetic field state of a magnetic field generator, a magnetic field state can be improved.

The block diagram of the diagnostic imaging system of this invention. The figure which shows the jig 300 for magnetic field measurement of this invention. The figure which shows the magnetic field measurement of the magnetic field generator 110 of this invention. The figure which shows the magnetic field measurement of the magnetic field generator 110 of this invention. The figure which shows the display form of the display part 108 of this invention. The figure which shows the display form of the display part 108 of this invention. The flowchart which shows the execution procedure of this invention.

  The image diagnostic system and magnetic field state determination method of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of the diagnostic imaging system of the present invention. As shown in the figure, the diagnostic imaging system includes a reference image configuration unit 104 that configures a reference image from volume data captured in advance by the image diagnostic apparatus 100, and an ultrasonic image configuration unit 200 that configures an ultrasound image in real time. It is comprised including. Volume data is multi-slice image data obtained by imaging the inside of a subject with a plurality of slice planes.

  Volume data captured by the image diagnostic apparatus 100 is input to the image diagnostic system. As the diagnostic imaging apparatus 100, for example, an X-ray computed tomography apparatus (X-ray CT apparatus) or a magnetic resonance imaging apparatus (MRI apparatus) can be applied. X-ray CT images and MR images can provide objective images that do not depend on the procedure of the examiner. On the other hand, the image obtained by the ultrasonic diagnostic apparatus is an image that depends on the procedure of the examiner. Therefore, it is effective to use an image of the same cross section of an X-ray CT or MR image ultrasonic diagnostic apparatus as a reference image. When performing ultrasonic diagnosis of changes in the tissue of the subject over time, volume data of an ultrasonic image acquired in advance can be drawn as a reference image.

  In FIG. 1, description of functions generally provided in the ultrasonic diagnostic apparatus is omitted, and functions of main parts related to display of a reference image according to features of the present invention are described. As shown in the figure, the diagnostic imaging system can be broadly divided into a system that configures an ultrasound image and a system that reconstructs a reference image.

  The ultrasound image configuration system is configured by including an ultrasound probe 202 and an ultrasound image configuration unit 200, and the latter reference image reconstruction system is configured by including a volume data storage unit 102 and a reference image configuration unit 104. Is done.

  The ultrasound image construction unit 200 constructs an ultrasound image based on the reflected echo signal output from the ultrasound probe 202. Further, position information (position and inclination) of the position sensor 114 is associated with the ultrasound image formed by the ultrasound image construction unit 200.

  On the other hand, the control unit 112 calculates the scan plane coordinates of the ultrasonic probe 202 based on the position information of the position sensor 114, and outputs the calculated scan plane coordinates to the reference image construction unit 104. The reference image construction unit 104 extracts tomographic image data corresponding to the scan plane coordinates input from the control unit 112 from the volume data storage unit 102, and reconstructs the reference image. The image synthesis unit 106 synthesizes the ultrasound image configured by the ultrasound image configuration unit 200 and the reference image reconstructed by the reference image configuration unit 104. The synthesis of the ultrasonic image and the reference image is to display each image in parallel or in a superimposed manner. The synthesized ultrasonic image and reference image are displayed on the display unit.

  The ultrasonic probe 202 transmits and receives ultrasonic waves to and from the subject, and includes a plurality of transducers that generate ultrasonic waves and receive reflected echoes. The ultrasound image constructing unit 200 inputs the reflected echo signal output from the ultrasound probe 202 and converts it into a digital signal, and for example, an ultrasound image of a diagnostic part such as a tomographic image or a color flow mapping image (CFM image) Configure. The ultrasonic image construction unit 200 has a function of a scan converter for matching the constructed ultrasonic image with the display format of the display unit 108.

  The volume data storage unit 102 captures and stores volume data imaged by the diagnostic imaging apparatus 100 via a network or a portable storage medium such as a magneto-optical disk (MO).

  The position sensor 114 is attached to the ultrasonic probe 202 and detects the three-dimensional position and inclination of the ultrasonic probe 202. In addition, a magnetic field generator 110 of a coordinate system including the subject is installed near the bed on which the subject lies. A magnetic signal generated in the three-dimensional space from the magnetic field generator 110 is detected by the position sensor 114, and the three-dimensional position and inclination of the position sensor 114 in the reference coordinate system formed by the magnetic field generator 110 are detected.

  The control unit 112 obtains the position and inclination of the ultrasonic probe 202 in the reference coordinate system based on the output signals of the position sensor 114 and the magnetic field generator 110, and includes the position and inclination of the ultrasonic scan plane with respect to the subject. Scan plane coordinates are calculated. Further, the reference image construction unit 104 calculates the scan plane coordinates in the coordinate system of the reference image based on the scan plane coordinates calculated by the control unit 112. In other words, in the coordinate system of the volume data, the scan plane coordinates including, for example, x, y, z coordinate data at one corner of the scan plane and the rotation angles around the x, y, z axes of the scan plane are calculated. . Based on the calculated scan plane coordinates, the reference image construction unit 104 reconstructs a reference image having the same cross section as the ultrasonic scan plane from the volume data.

  Here, the magnetic field measurement of the magnetic field generator 110 is performed using a specific magnetic field measurement jig 300. The magnetic field measurement jig 300 will be described with reference to FIG. The magnetic field measurement jig 300 is installed on the bed on which the subject lies before diagnosis of the subject begins. That is, the subject is not lying on the bed on which the magnetic field measurement jig 300 is installed.

  The magnetic field measurement jig 300 is installed on the bed in accordance with the measurement site of the subject. For example, if the measurement site is the abdomen, the measurement site is set near the center of the bed, so the magnetic field measurement jig 300 is installed at the center in the longitudinal direction and the center in the short direction of the bed. Further, if the measurement site is a toe of a leg, the measurement site is set near the end of the bed, so the magnetic field measurement jig 300 is installed at the end of the bed in the longitudinal direction and in the center of the lateral direction. .

  The magnetic field measurement jig 300 has a predetermined three-dimensional shape such as a combination of a rectangle, a hemisphere, and a semicircular plate. Here, a cubic magnetic field measurement jig 300 is used. A magnetic field measurement jig 300 shown in FIG. 2 is formed of a cube having the same vertical and horizontal height, and has three flat plates. Each flat plate has a plurality of measurement points. On the flat plate of the magnetic field measurement jig 300, nine measurement points are installed at equal intervals (for example, at intervals of 5 cm). In addition, the measurement points on the upper and lower flat plates are also set at equal intervals (for example, at intervals of 5 cm). That is, a plurality of measurement points (27 points) are installed at equal intervals on the magnetic field measurement jig 300.

  Measurement points P (1) to P (9) are provided on the uppermost flat plate. A measuring point P (10) to P (18) is installed on the middle flat plate. Measurement points P (19) to P (27) are provided on the lowermost flat plate. For example, the distance between adjacent P (1) and P (2) on the uppermost flat plate is 5 cm, and the distance between P (2) and P (3) is 5 cm. The distance between P (1) on the uppermost flat plate and P (10) on the middle flat plate is 5 cm, and P (10) on the middle flat plate and P (19) on the lowermost flat plate The distance between is 5cm.

  In addition, each measurement point in the magnetic field measurement jig 300 is provided with a concave portion that matches the size of the ultrasonic probe 202 so that the ultrasonic probe 202 can be easily and appropriately installed. . For example, a recess having the same size as the aperture (vertical width, horizontal width) of the ultrasonic probe 202 is installed in the magnetic field measurement jig 300.

  Here, the magnetic field measurement of the magnetic field generator 110 will be described with reference to FIGS. The control unit 112 calculates position information of the measurement points of the magnetic field measurement jig 300 obtained from the position sensor 114, and determines the distortion of the magnetic field of the magnetic field generator 110. Specifically, as shown in FIG. 3, the control unit 112 includes a position information storage unit 400 that stores position information of measurement points of the magnetic field measurement jig 300, and position information of measurement points measured by the position sensor 114. The magnetic field generator distance calculation unit 402 that calculates the distance between the measurement point and the magnetic field generator 110 from the measurement point, and the distance between the measurement points that calculates the distance between the adjacent measurement points from the position information of the measurement point measured by the position sensor 114 Based on the distance between the measurement point calculated by the calculation unit 404 and the magnetic field generator distance calculation unit 402 and the magnetic field generator 110 and / or the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit 404 It is comprised from the determination part 406 which determines a magnetic field state.

The operator installs the position sensor 114 on the magnetic field measurement jig 300. As shown in FIG. 4, an ultrasonic probe 202 on which the position sensor 114 is mounted may be installed at a measurement point of the magnetic field measurement jig 300. Then, the position information of the measurement points of the magnetic field measurement jig 300 is obtained from the position sensor 114. The position information of the measurement points obtained from the position sensor 114 is stored in the position information storage unit 400. For example, the position information (Xp1, Yp1, Zp1) is measured at the measurement point P (1) and stored in the position information storage unit 400. At the measurement point of P (2), position information (Xp2, Yp2, Zp2) is measured and stored in the position information storage unit 400.
The magnetic field generator distance calculation unit 402 calculates the distance between the measurement point and the magnetic field generator 110 from the position information of each measurement point. Specifically, when the distance D (1) between the measurement point P (1) and the magnetic field generator 110 is calculated, the magnetic field generator distance calculation unit 402 stores P (1) stored in the position information storage unit 400. The distance D (1) between the measurement point and the magnetic field generator 110 is calculated from the position information (Xp1, Yp1, Zp1) of the measurement point. The magnetic field generator distance calculation unit 402 calculates the distance D (1) between P (1) and the magnetic field generator 110 using the following equation. Since the magnetic field generator 110 is the origin, the position information of the magnetic field generator 110 is (0, 0, 0).

Similarly, the magnetic field generator distance calculation unit 402 calculates the distances D (2) to D (27) between the respective measurement points P (2) to P (27) and the magnetic field generator 110.

  The determination unit 406 compares the distance D (1) between the measurement point P (1) calculated by the magnetic field generator distance calculation unit 402 and the magnetic field generator 110 with a predetermined appropriate distance range, The magnetic field state of the magnetic field generator 110 is determined. That is, the determination unit 406 determines the magnetic field state of the magnetic field generator 110 based on the distance between the measurement point calculated by the magnetic field generator distance calculation unit 402 and the magnetic field generator 110.

  If the measurement point is too close to the magnetic field generator 110 (for example, within 10 cm), the magnetic field strength of the magnetic field generator 110 is strong, and the position sensor 114 cannot properly measure the position information. If the measurement point is too far from the magnetic field generator 110 (for example, 100 cm or more), the magnetic field strength of the magnetic field generator 110 is weak and the position sensor 114 cannot properly measure the position information.

  In the magnetic field generator 110 of the present embodiment, the magnetic field strength is stable at about 0.1 mT when the distance from the magnetic field generator 110 is 10 cm to 100 cm. Therefore, in this embodiment, the appropriate distance range is 10 cm to 100 cm. The determination unit 406 stores a predetermined appropriate distance range. Note that the operator can change the appropriate distance range as appropriate.

  When the distance D (1) between the measurement point P (1) and the magnetic field generator 110 is within an appropriate distance range (10 cm to 100 cm), the determination unit 406 has a stable magnetic field strength and a normal magnetic field state. Is determined. If the distance D (1) between the measurement point P (1) and the magnetic field generator 110 is outside the appropriate distance range (˜10 cm, 100 cm˜), the determination unit 406 indicates that the magnetic field strength is unstable and the magnetic field state is It is determined to be defective.

  Similarly, the determination unit 406 includes a distance D (2) to D (27) between each measurement point of P (2) to P (27) and the magnetic field generator 110, and a predetermined appropriate distance range. To determine whether the magnetic field state is normal or defective. That is, the determination unit 406 determines whether the distance between the magnetic field measurement jig 300 (each measurement point) installed at the position to be the measurement site of the subject and the magnetic field generator 110 is within the appropriate distance range, Determine the state.

  The inter-measurement point distance calculation unit 404 calculates the distance between adjacent measurement points based on the position information of the measurement points of the magnetic field measurement jig 300 stored in the position information storage unit 400. Specifically, when calculating the distance between the measurement point of P (1) and the measurement point of P (2), the inter-measurement point distance calculation unit 404 stores the P (1) stored in the position information storage unit 400. From the position information (Xp1, Yp1, Zp1) of the measurement points and the position information (Xp2, Yp2, Zp2) of the measurement points of P (2), the distance between the P (1) -P (2) measurement points is calculated. The inter-measurement point distance calculation unit 404 calculates the distance between P (1) -P (2) measurement points using the following equation.

Similarly, the inter-measurement point distance calculation unit 404 calculates the distance between the measurement points P (1) −P (10). Further, the inter-measurement-point distance calculation unit 404 calculates the distance between adjacent measurement points for the measurement points P (2) to P (27). For example, for the measurement point P (2), the inter-measurement point distance calculation unit 404 calculates the distance between the measurement points P (1) -P (2) and the measurement point P (2) -P (3). And the distance between the measurement points P (2) -P (11).

  The determination unit 406 measures the distortion of the magnetic field by comparing the distance between the adjacent measurement points calculated by the inter-measurement point distance calculation unit 404 with the distance between the actual measurement points in the magnetic field measurement jig 300. Then, the magnetic field state of the magnetic field generator 110 is determined. That is, the determination unit 406 determines the magnetic field state of the magnetic field generator 110 based on the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit 404.

  For example, when the actual measurement points in the magnetic field measurement jig 300 are installed at equal intervals of 5 cm, the distance between adjacent measurement points calculated by the distance calculation unit 404 is within a predetermined range, for example, 5 cm. If it is within the range of ± 0.2 cm (4.8 cm to 5.2 cm), there is no distortion of the magnetic field, and it is determined that the magnetic field state of the magnetic field generator 110 is normal. If the distance between adjacent measurement points calculated by the distance calculation unit 404 between measurement points is outside a predetermined range, for example, outside the range of 5 cm ± 0.2 cm (~ 4.8 cm, 5.2 cm ~), the magnetic field is distorted, It is determined that the magnetic field state of the magnetic field generator 110 is defective.

  Here, the display form of the display unit 108 will be described with reference to FIGS. The display unit 108 displays a jig model 500 that models the magnetic field measurement jig 300 and a position sensor model 502 that models the position sensor 114. Further, the display unit 108 displays coordinates 504 that are position information of the measurement points P (1) to P (27) of the magnetic field measurement jig 300. Registration of position information of a plurality of measurement points on the magnetic field measurement jig 300 is sequentially received, and their coordinates 504 are sequentially displayed. The display unit 108 also serves to guide the operator in the order of registering a plurality of measurement points. For example, since the jig model 500 of the magnetic field measurement jig 300 is displayed, the measurement points P (1), P (2),... Measurement points of the jig 300 can be measured in the accepted order.

  Further, the distance between measurement points calculated by the distance calculation unit 404 between measurement points is displayed in the measurement point distance display frame 506 in association with the measurement point. For example, for the measurement point P (1), the distance between the measurement points P (1) -P (2) and the distance between the measurement points P (1) -P (10) are displayed in association with each other. .

  The distance between each measurement point calculated by the magnetic field generator distance calculation unit 402 and the magnetic field generator 110 is displayed in the magnetic field generator distance display frame 508 in association with the measurement point. For example, for the measurement point P (1), a distance D (1) that is the distance between the measurement point P (1) and the magnetic field generator 110 is displayed. For the measurement point P (2), a distance D (2) that is the distance between the measurement point P (2) and the magnetic field generator 110 is displayed.

  In addition, the magnetic field state (normal or defective) of the magnetic field generator 110 determined by the determination unit 406 is displayed in the determination frame 512. In the display form of the display unit 108 in FIG. 5, the magnetic field state of the magnetic field generator 110 is normal. In the display form of the display unit 108 in FIG. 6, the magnetic field state of the magnetic field generator 110 is defective. Furthermore, the display unit 108 can also display a comment for improving a defect in the magnetic field state in the comment frame 512. If any of the distances D (1) to D (27) between the measurement point and the magnetic field generator 110 is outside the appropriate distance range (~ 10cm, 100cm ~), "Please move the magnetic field generator." Or, a comment “Please remove the magnetic substance from the surroundings of the magnetic field generator and the position sensor” is displayed in the comment frame 512. If the distance between the measurement points of P (2) -P (3) is outside the specified range (up to 4.8 cm, 5.2 cm), the magnetic field of P (2) -P (3) is distorted. Is displayed in the comment frame 512. It is also possible to display a comment for checking an obstacle near P (2) -P (3).

The display unit 108 can also display the measurement point that has caused the magnetic field state to be defective. For example, when only the distance between the measurement point P (25) and the magnetic field generator 110 is outside the appropriate distance range (up to 10 cm, 100 cm), and the determination unit 406 determines that the magnetic field state is defective, the display unit 108 The measurement point P (25) is displayed. The operator can perform measurement again at the measurement point P (25) or adjust the installation position of the magnetic field generator 110 so as to deviate from the measured position of the measurement point P (25).
The display unit 108 can take various display methods in which the magnetic field state is poor.For example, the display color between measurement points that caused the poor magnetic field state is different from other display colors. Can be displayed. Further, as shown in FIG. 6, the display unit 108 deforms (for example, tilts) the position sensor model 502 of the ultrasonic probe 202 at the measurement point that causes the poor magnetic field state. ) It can also be displayed.

  Next, the operation procedure of the present embodiment will be described with reference to FIG.

  (S100) The magnetic field generator distance calculation unit 402 calculates the distance between the measurement point and the magnetic field generator 110 from the position information of each measurement point.

  (S102) The determination unit 406 compares the distance between each measurement point calculated by the magnetic field generator distance calculation unit 402 and the magnetic field generator 110 with a predetermined appropriate distance range, and generates each measurement point and the magnetic field generated. It is determined whether the distance from the device 110 is within the appropriate distance range. If the distance between each measurement point and the magnetic field generator 110 is within an appropriate distance range, the process proceeds to S106. If the distance between a certain measurement point and the magnetic field generator 110 is outside the appropriate distance range, the process proceeds to S104.

  (S104) The operator moves the magnetic field generator 110 and adjusts the position of the magnetic field generator 110.

  (S106) The distance calculation unit 404 between measurement points calculates the distance between adjacent measurement points at each measurement point.

  (S108) The determination unit 406 compares the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit 404 with the distance between actual measurement points in the magnetic field measurement jig 300, and measures the adjacent measurement points. It is determined whether the distance between them is within a predetermined range. If the distance between adjacent measurement points is within a predetermined range, the process proceeds to S112. If the distance between adjacent measurement points is outside the predetermined range, the process proceeds to S110.

  (S110) The operator confirms an obstacle or the like near the measurement point where the distance between the adjacent measurement points is outside the predetermined range. If an obstacle is found near the measurement point, the operator removes the obstacle. If no obstacle is found, the operator changes the position of the bed or changes the diagnostic room.

  (S112) The determination unit 406 determines that the magnetic field state of the magnetic field generator 110 is normal. The operator confirms that the diagnosis is possible.

  As described above, the determination unit 406 determines whether the distance between the magnetic field measurement jig 300 (each measurement point) and the magnetic field generator 110 is within the appropriate distance range, and then measures the adjacent measurement of the magnetic field measurement jig 300. By determining whether the distance between the points is within a predetermined range, it is possible to efficiently grasp the magnetic field state of the magnetic field generator and improve the magnetic field state. This is because the distance between the magnetic field measurement jig 300 (each measurement point) and the magnetic field generator 110 installed at the position to be the measurement site of the subject most affects the magnetic field state of the magnetic field measurement jig 300. .

  To summarize this example, the magnetic field generator 110 that generates a magnetic field and the position sensor 114 that detects position information based on the magnetic signal of the magnetic field generator 110 are provided, and are imaged in advance by the diagnostic imaging apparatus 100 based on the position information. A plurality of measurement points for measuring the magnetic field of the magnetic field generator 110 in the diagnostic imaging system in which a reference image having the same cross section as the scan plane of the ultrasonic image configured in real time is extracted from the volume data and displayed on the display unit 108. A magnetic field measurement jig 300, a magnetic field generator distance calculation unit 402 that calculates a distance between the measurement point and the magnetic field generator 110 from position information of the measurement point measured by the position sensor 114, and a magnetic field generator A determination unit 406 that determines the magnetic field state of the magnetic field generator 110 based on the distance between the measurement point calculated by the distance calculation unit 402 and the magnetic field generator 110 is provided. The determination unit 406 compares the distance between the measurement point calculated by the magnetic field generator distance calculation unit 402 and the magnetic field generator 110 with a predetermined appropriate distance range, thereby determining the magnetic field state of the magnetic field generator 110. judge.

  Further, the magnetic field measurement jig 300 having a plurality of measurement points for measuring the magnetic field of the magnetic field generator 110 and the distance between adjacent measurement points from the position information of the measurement points measured by the position sensor 114 are calculated. A measurement point distance calculation unit 404 to be calculated, and a determination unit 406 that determines the magnetic field state of the magnetic field generator 110 based on the distance between adjacent measurement points calculated by the measurement point distance calculation unit 404 based on the position information. With. The determination unit 406 compares the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit 404 with the actual distance between the measurement points in the magnetic field measurement jig 300, thereby determining the magnetic field generator 110. Determine the magnetic field state.

  According to the present embodiment, the magnetic field state of the magnetic field generator 110 can be grasped, the magnetic field state can be improved, and a diagnosis can be performed when the magnetic field state of the magnetic field generator 110 is normal. In other words, the reference image of the same cross section as the scan plane of the ultrasonic image is not shifted by the magnetic field state of the magnetic field generator 110, and the cross section of the ultrasonic image displayed by the ultrasonic inspection in real time and the reference image cut out from the volume data is not shifted. Can be cut out and displayed.

  Here, Example 2 will be described. The difference from the first embodiment is that the determination unit 406 determines the magnetic field state of the magnetic field generator 110 based on the magnetic field strength of the magnetic field generator 110. The operator installs the magnetic field strength measurement unit on the magnetic field measurement jig 300. Note that an ultrasonic probe 202 equipped with a magnetic field strength measurement unit may be installed at a measurement point of the magnetic field measurement jig 300.

  The determination unit 406 obtains the magnetic field strength from the magnetic field strength measurement unit at each measurement point of the magnetic field measurement jig 300. In this embodiment, it is assumed that the magnetic field strength is stable when it is 0.1 ± 0.02 mT. The determination unit 406 determines that the magnetic field strength is appropriate and the magnetic field state is normal if the magnetic field strength at each measurement point measured by the magnetic field strength measurement unit is within the appropriate magnetic field strength range (0.08 mT to 0.12 mT). To do. The determination unit 406 determines that the magnetic field strength is not good if the magnetic field strength at each measurement point measured by the magnetic field strength measurement unit is outside the proper magnetic field strength range, for example, 0.1 ± 0.02 mT (up to 0.08 mT, 0.12 mT). It is appropriate and the magnetic field state is determined to be poor. When it is determined that the magnetic field state is defective, the operator moves the magnetic field generator 110 and adjusts the position of the magnetic field generator 110.

  The operation procedure of the present embodiment can be implemented by replacing S100 and S102 in the flowchart of FIG. 7 with the above-described measurement of the magnetic field strength and determination based on the magnetic field strength, and thus detailed description thereof is omitted.

  According to the present embodiment, the magnetic field state of the magnetic field generator 110 can be grasped based on the magnetic field strength, the magnetic field state can be improved, and diagnosis can be performed when the magnetic field state of the magnetic field generator 110 is normal. it can.

  100 diagnostic imaging apparatus, 102 volume data storage unit, 104 reference image construction unit, 106 image composition unit, 108 display unit, 110 magnetic field generation unit, 112 control unit, 114 position sensor, 200 ultrasound image construction unit, 202 ultrasound probe Tentacles, 300 magnetic field measuring jigs

Claims (9)

  1. A magnetic field generator that generates a magnetic field, and a position sensor that detects position information based on a magnetic signal of the magnetic field generator, and is configured in real time from volume data imaged in advance by an image diagnostic apparatus based on the position information. In the diagnostic imaging system that cuts out a reference image having the same cross section as the scan surface of the ultrasonic image and displays it on the display unit,
    A magnetic field measurement tool having a plurality of measurement points for measuring the magnetic field of the magnetic field generator;
    A magnetic field generator distance calculation unit that calculates a distance between the measurement point and the magnetic field generator from position information of the measurement point measured by the position sensor, and the measurement point calculated by the magnetic field generator distance calculation unit And a determination unit that determines a magnetic field state of the magnetic field generator based on a distance between the magnetic field generator and the magnetic field generator ,
    The imaging system in each measurement point in the magnetic field measurement jig, characterized in Rukoto recess that matches the size of the ultrasonic probe is provided.
  2. A magnetic field generator that generates a magnetic field, and a position sensor that detects position information based on a magnetic signal of the magnetic field generator, and is configured in real time from volume data imaged in advance by an image diagnostic apparatus based on the position information. In the diagnostic imaging system that cuts out a reference image having the same cross section as the scan surface of the ultrasonic image and displays it on the display unit,
    A magnetic field measurement tool having a plurality of measurement points for measuring the magnetic field of the magnetic field generator;
    A magnetic field generator distance calculation unit that calculates a distance between the measurement point and the magnetic field generator from position information of the measurement point measured by the position sensor, and the measurement point calculated by the magnetic field generator distance calculation unit And a determination unit that determines a magnetic field state of the magnetic field generator based on a distance between the magnetic field generator and the magnetic field generator,
    The image display system, wherein the display unit displays a measurement point that causes a failure of a magnetic field state of the magnetic field generator.
  3. The determination unit compares the distance between the measurement point calculated by the magnetic field generator distance calculation unit and the magnetic field generator and a predetermined appropriate distance range, thereby determining the magnetic field state of the magnetic field generator. 3. The diagnostic imaging system according to claim 1, wherein the diagnostic imaging system is determined.
  4. A magnetic field generator that generates a magnetic field, and a position sensor that detects position information based on a magnetic signal of the magnetic field generator, and is configured in real time from volume data imaged in advance by an image diagnostic apparatus based on the position information. In the diagnostic imaging system that cuts out a reference image having the same cross section as the scan surface of the ultrasonic image and displays it on the display unit,
    A magnetic field measurement tool having a plurality of measurement points for measuring the magnetic field of the magnetic field generator;
    A distance calculation unit between measurement points that calculates a distance between adjacent measurement points from position information of the measurement points measured by the position sensor, and a distance between adjacent measurement points calculated by the distance calculation unit between measurement points and a determining unit a magnetic field state of the magnetic field generator based for a distance,
    The imaging system in each measurement point in the magnetic field measurement jig, characterized in Rukoto recess that matches the size of the ultrasonic probe is provided.
  5. A magnetic field generator that generates a magnetic field, and a position sensor that detects position information based on a magnetic signal of the magnetic field generator, and is configured in real time from volume data imaged in advance by an image diagnostic apparatus based on the position information. In the diagnostic imaging system that cuts out a reference image having the same cross section as the scan surface of the ultrasonic image and displays it on the display unit,
    A magnetic field measurement tool having a plurality of measurement points for measuring the magnetic field of the magnetic field generator;
    A distance calculation unit between measurement points that calculates a distance between adjacent measurement points from position information of the measurement points measured by the position sensor, and a distance between adjacent measurement points calculated by the distance calculation unit between measurement points A determination unit that determines the magnetic field state of the magnetic field generator based on the distance of
    The display unit, diagnostic imaging system according to claim you to view the measurement point field state of the magnetic field generator is a factor is poor.
  6. The determination unit compares the distance between adjacent measurement points calculated by the inter-measurement point distance calculation unit with the distance between actual measurement points in the magnetic field measurement jig. 6. The diagnostic imaging system according to claim 4, wherein the magnetic field state is determined.
  7. The diagnostic imaging system according to any one of claims 1, 2, 4, and 5, wherein the magnetic field measurement jig is installed on a bed in accordance with a measurement site of a subject.
  8. 6. The diagnostic imaging system according to claim 1, wherein a plurality of the measurement points are installed at equal intervals on the magnetic field measurement jig.
  9. The ultrasonic probe includes a magnetic field strength measurement unit that measures the magnetic field strength of the magnetic field generator, and the determination unit determines the magnetic field state of the magnetic field generator based on the magnetic field strength of the magnetic field generator. The diagnostic imaging system according to any one of claims 1 , 2, 4, and 5 .
JP2011092561A 2011-04-19 2011-04-19 diagnostic imaging system Expired - Fee Related JP5802421B2 (en)

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