Ultrasonic device and method for displaying three-dimensional ultrasonic images

Abstract

The present invention discloses an ultrasound device and a method and system for displaying three-dimensional ultrasound images. The system first acquires raw three-dimensional ultrasound volume data containing a fetal face; then determines the orientation of the fetal face from the raw three-dimensional ultrasound volume data based on the image features of the fetal face; and then, based on the orientation of the fetal face, automatically obtains and displays an ultrasound image of the fetal face at a preset viewing angle. This allows the three-dimensional ultrasound volume data of the subject to be automatically rotated to the desired orientation, eliminating the need for manual orientation adjustment and improving efficiency.

Description

Technical Field

[0001] The present invention relates to an ultrasonic device, and in particular to a method for displaying a three-dimensional ultrasonic image on the ultrasonic device. Background Art

[0002] Prenatal ultrasound examinations are one of the most important tests that expectant mothers must undergo during pregnancy. Their main functions include determining fetal age, analyzing fetal development, detecting fetal malformations or abnormalities, and taking photos and videos of the fetus. Among them, fetal facial ultrasound examinations can automatically record the fetal facial appearance and detect facial deformities for expectant mothers, and are also a must-check item in prenatal ultrasound examinations. Because the fetus may be in various positions during a prenatal ultrasound examination, fetal facial ultrasound examinations currently require an experienced physician who moves the probe according to the fetal position to find the appropriate orientation for imaging, or requires the pregnant woman to move appropriately to adjust the fetal position for imaging. This inevitably increases the cost of the examination, prolongs the examination time, and places high demands on the physician. Summary of the Invention

[0003] The present invention mainly provides an ultrasound device and a method for displaying a three-dimensional ultrasound image thereof, aiming to solve the problem that the three-dimensional volume data of a measured object cannot be automatically rotated to a desired orientation.

[0004] In one embodiment, a three-dimensional ultrasound image display transformation method is provided, comprising:

[0005] Acquiring original ultrasonic three-dimensional volume data containing the measured object;

[0006] Detecting the position of the object under test from the original ultrasonic three-dimensional volume data according to the image features of the object under test;

[0007] Comparing the orientation of the object under test with the expected orientation to obtain rotation transformation parameters in the three-dimensional coordinate system;

[0008] Performing a rotation transformation on the original ultrasonic three-dimensional volume data according to the rotation transformation parameters to obtain transformed three-dimensional volume data; and,

[0009] Output the transformed 3D volume data.

[0010] In one embodiment, a three-dimensional ultrasound image display transformation method is provided, comprising:

[0011] Acquire original ultrasound three-dimensional volume data containing the fetus's face;

[0012] detecting the orientation of the fetal face from the original ultrasound three-dimensional volume data according to the image features of the fetal face;

[0013] Rotating the orientation of the fetus's face to obtain transformed three-dimensional volume data; and,

[0014] Displays the transformed 3D volume data.

[0015] In one embodiment, an ultrasound device is provided, comprising:

[0016] monitor;

[0017] An ultrasonic probe, used for transmitting ultrasonic waves to a region of interest in biological tissue and receiving echoes of the ultrasonic waves;

[0018] A transmit / receive sequence controller is used to generate a transmit sequence and / or a receive sequence, output the transmit sequence and / or the receive sequence to the ultrasound probe, and control the ultrasound probe to transmit ultrasound to the region of interest and receive ultrasound echoes;

[0019] The processor is configured to generate original ultrasonic three-dimensional volume data containing a measured object based on ultrasonic echo data; detect the orientation of the measured object from the original ultrasonic three-dimensional volume data based on image features of the measured object; compare the orientation of the measured object with a desired orientation to obtain rotation transformation parameters in a three-dimensional coordinate system; perform a rotation transformation on the original ultrasonic three-dimensional volume data based on the rotation transformation parameters to obtain transformed three-dimensional volume data; and output the transformed three-dimensional volume data to a display for display to obtain an ultrasonic image.

[0020] In one embodiment, an ultrasound device is provided, comprising:

[0021] Memory, used to store programs;

[0022] The processor is configured to implement the method described above by executing the program stored in the memory.

[0023] In one embodiment, an ultrasound device is provided, comprising:

[0024] monitor;

[0025] An ultrasonic probe, used for transmitting ultrasonic waves to a region of interest in biological tissue and receiving echoes of the ultrasonic waves;

[0026] A transmit / receive sequence controller is used to generate a transmit sequence and / or a receive sequence, output the transmit sequence and / or the receive sequence to the ultrasound probe, and control the ultrasound probe to transmit ultrasound to the region of interest and receive ultrasound echoes;

[0027] The processor is configured to generate raw ultrasonic three-dimensional volume data containing a fetal face based on ultrasonic echo data; detect the orientation of a measured object from the raw ultrasonic three-dimensional volume data based on image features of the fetal face; rotate the orientation of the fetal face to obtain transformed three-dimensional volume data; and output the transformed three-dimensional volume data to a display to obtain an ultrasonic image of a preset viewing angle.

[0028] In one embodiment, a computer-readable storage medium is provided, comprising:

[0029] The invention comprises a program which can be executed by a processor to implement the method described above.

[0030] In one embodiment, a three-dimensional ultrasound image display conversion system is provided, comprising:

[0031] An acquisition unit for acquiring original ultrasonic three-dimensional volume data containing the measured object;

[0032] An orientation detection unit for detecting the orientation of the object to be measured from the original ultrasonic three-dimensional volume data according to the image features of the object to be measured;

[0033] a calculation unit for comparing the orientation of the object under test with the expected orientation to obtain rotation transformation parameters in a three-dimensional coordinate system;

[0034] a transformation unit configured to perform a rotation transformation on the original ultrasonic three-dimensional volume data according to the rotation transformation parameters to obtain transformed three-dimensional volume data;

[0035] An image output unit is used to output the transformed three-dimensional volume data to a display to obtain an ultrasound image.

[0036] In one embodiment, a three-dimensional ultrasound image display conversion system is provided, comprising:

[0037] An acquisition unit for acquiring original ultrasonic three-dimensional volume data including the fetus's face;

[0038] An orientation detection unit for detecting the orientation of the object to be detected from the original ultrasonic three-dimensional volume data according to the image features of the fetus' face;

[0039] A transformation unit for rotating the orientation of the fetus' face to obtain transformed three-dimensional volume data;

[0040] An image output unit is used to output the transformed three-dimensional volume data to a display to obtain an ultrasound image.

[0041] In one embodiment, a method for displaying a three-dimensional ultrasound image is provided, comprising:

[0042] Acquire original ultrasound three-dimensional volume data containing the fetus's face;

[0043] determining an orientation of the fetal face in the original three-dimensional ultrasound volume data based on image features of the fetal face, wherein the image features include image characteristics corresponding to anatomical structures of one or more tissue structures on the fetal face in the three-dimensional ultrasound volume data, wherein the one or more tissue structures are selected from a group consisting of a fetal eye, a fetal nose, a fetal forehead, a fetal chin, a fetal cheek, a fetal ear, a fetal facial contour, and a fetal mouth;

[0044] Based on the orientation of the fetal face, obtaining an ultrasound image of the fetal face at a preset viewing angle;

[0045] Displays an ultrasound image of the fetus's face at a preset viewing angle.

[0046] In one embodiment, the preset viewing angle includes at least one of the front of the fetus' face, the side of the fetus' face, and a 45-degree angle diagonally in front of the fetus' face.

[0047] In one embodiment, obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes:

[0048] Rotating the original three-dimensional ultrasonic volume data according to the orientation of the fetus' face so that the current viewing angle of the rotated original three-dimensional ultrasonic volume data is the preset viewing angle;

[0049] The rotated original ultrasonic three-dimensional volume data is rendered at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

[0050] In one embodiment, obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes:

[0051] Adjusting the current viewing angle of the original three-dimensional ultrasound data to the preset viewing angle according to the orientation of the fetus' face;

[0052] The original ultrasonic three-dimensional volume data is rendered at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

[0053] In one embodiment, determining the position of the fetal face in the original three-dimensional ultrasound data based on the image features of the fetal face includes one of the following methods:

[0054] The orientation of the fetal face is obtained by inputting the original ultrasound three-dimensional volume data into a machine learning model, and the machine learning model is trained using samples of the correspondence between the image features and orientation of the fetal face that have been labeled;

[0055] Outputting the original three-dimensional ultrasound data to a display for display to obtain an ultrasound image, detecting one or more marker points input by a user on the ultrasound image, wherein the one or more marker points correspond to one or more tissue structures on the fetal face on the ultrasound image; obtaining a first connecting line based on the fetal eyes; obtaining a second connecting line based on any two of the midpoint of the first connecting line, the fetal nose, and the fetal mouth, or obtaining a second connecting line based on multiple points on the fetal facial contour in the center of the fetal face; obtaining the orientation of the fetal face based on the first connecting line and the second connecting line; and,

[0056] One or more tissue structures are automatically extracted from the original ultrasound three-dimensional data based on the image features of the fetal face; a first connecting line is obtained based on the detected fetal eyes; a second connecting line is obtained based on the midpoint of the first connecting line, any two of the fetal nose and the fetal mouth, or a second connecting line is obtained based on multiple points on the fetal facial contour in the center of the fetal face; the orientation of the fetal face can be obtained based on the first connecting line and the second connecting line.

[0057] In one embodiment, the method further includes: detecting the position of the fetal face from the original ultrasonic three-dimensional volume data based on the image features of the fetal face; determining the relative position of the fetal face in the display window based on the position of the fetal face, comparing the relative position of the fetal face with the expected position of the fetal face in the display window to obtain a displacement vector or coordinate difference in the three-dimensional coordinate system; and performing coordinate transformation on the original ultrasonic three-dimensional volume data based on the displacement vector or coordinate difference to translate the fetal face to the expected position in the display window.

[0058] In one embodiment, the orientation of the fetal face includes the direction of the fetal face and the direction of the top of the fetal head.

[0059] In one embodiment, an ultrasound device is provided, comprising:

[0060] monitor;

[0061] An ultrasonic probe, used for transmitting ultrasonic waves to a region of interest in biological tissue and receiving echoes of the ultrasonic waves;

[0062] A transmit / receive sequence controller is used to generate a transmit sequence and / or a receive sequence, output the transmit sequence and / or the receive sequence to the ultrasound probe, and control the ultrasound probe to transmit ultrasound to the region of interest and receive ultrasound echoes;

[0063] Processor for:

[0064] generating original ultrasound three-dimensional volume data including the fetal face according to the ultrasound echo data;

[0065] determining an orientation of the fetal face in the original three-dimensional ultrasound volume data based on image features of the fetal face, wherein the image features include image characteristics corresponding to anatomical structures of one or more tissue structures on the fetal face in the three-dimensional ultrasound volume data, wherein the one or more tissue structures are selected from a group consisting of a fetal eye, a fetal nose, a fetal forehead, a fetal chin, a fetal cheek, a fetal ear, a fetal facial contour, and a fetal mouth;

[0066] Based on the orientation of the fetal face, obtaining an ultrasound image of the fetal face at a preset viewing angle;

[0067] Displays an ultrasound image of the fetus's face at a preset viewing angle.

[0068] In one embodiment, the preset viewing angle includes at least one of the front of the fetus' face, the side of the fetus' face, and a 45-degree angle diagonally in front of the fetus' face.

[0069] In one embodiment, the processor obtains an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face, including:

[0070] The processor rotates the original three-dimensional ultrasonic volume data according to the orientation of the fetus' face so that the current viewing angle of the rotated original three-dimensional ultrasonic volume data is the preset viewing angle;

[0071] The processor renders the rotated original ultrasonic three-dimensional volume data at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

[0072] In one embodiment, the processor obtains an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face, including:

[0073] The processor adjusts the current viewing angle of the original ultrasonic three-dimensional volume data to the preset viewing angle according to the orientation of the fetus' face;

[0074] The processor renders the original ultrasonic three-dimensional volume data at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

[0075] In one embodiment, the processor determines the position of the fetal face in the original three-dimensional ultrasound data based on the image features of the fetal face by one of the following methods:

[0076] The orientation of the fetal face is obtained by inputting the original ultrasound three-dimensional volume data into a machine learning model, and the machine learning model is trained using samples of the correspondence between the image features and orientation of the fetal face that have been labeled;

[0077] Outputting the original three-dimensional ultrasound data to a display for display to obtain an ultrasound image, detecting one or more marker points input by a user on the ultrasound image, wherein the one or more marker points correspond to one or more tissue structures on the fetal face on the ultrasound image; obtaining a first connecting line based on the fetal eyes; obtaining a second connecting line based on any two of the midpoint of the first connecting line, the fetal nose, and the fetal mouth, or obtaining a second connecting line based on multiple points on the fetal facial contour in the center of the fetal face; obtaining the orientation of the fetal face based on the first connecting line and the second connecting line; and,

[0078] One or more tissue structures are automatically extracted from the original ultrasound three-dimensional data based on the image features of the fetal face; a first connecting line is obtained based on the detected fetal eyes; a second connecting line is obtained based on the midpoint of the first connecting line, any two of the fetal nose and the fetal mouth, or a second connecting line is obtained based on multiple points on the fetal facial contour in the center of the fetal face; the orientation of the fetal face can be obtained based on the first connecting line and the second connecting line.

[0079] In one embodiment, the processor is further used to: detect the position of the fetal face from the original ultrasound three-dimensional volume data based on the image features of the fetal face; determine the relative position of the fetal face in the display window based on the position of the fetal face, compare the relative position of the fetal face with the expected position of the fetal face in the display window, and obtain a displacement vector or coordinate difference in the three-dimensional coordinate system; move the three-dimensional volume data according to the displacement vector or coordinate difference so that the fetal face is translated to the expected position in the display window.

[0080] In one embodiment, the orientation of the fetal face includes the direction of the fetal face and the direction of the top of the fetal head.

[0081] According to the ultrasound device and method for displaying 3D ultrasound images in the above-mentioned embodiments, raw 3D ultrasound volume data containing a fetal face is first acquired. The orientation of the fetal face is then determined from the raw 3D ultrasound volume data based on its image features. Based on this orientation, an ultrasound image of the fetal face at a preset viewing angle is automatically acquired and displayed. This allows the 3D ultrasound volume data of the subject to be automatically rotated to the desired orientation, eliminating the need for manual orientation adjustment and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 A structural block diagram of an embodiment of an ultrasonic device provided by the present invention;

[0083] Figure 2 This is a structural block diagram of an embodiment of a three-dimensional ultrasound image display conversion system provided by the present invention;

[0084] Figure 3 A flowchart of the three-dimensional ultrasound image display transformation method provided by the present invention;

[0085] Figure 4 In one embodiment of the ultrasound device provided by the present invention, an image of original ultrasound three-dimensional volume data on a display;

[0086] Figure 5 In one embodiment of the ultrasound device provided by the present invention, an image of the three-dimensional volume data after rotational transformation on a display;

[0087] Figure 6A first schematic diagram of a first connecting line and a second connecting line in an embodiment of the ultrasound device provided by the present invention;

[0088] Figure 7 A second schematic diagram of the first connecting line and the second connecting line in one embodiment of the ultrasound device provided by the present invention;

[0089] Figure 8 This is a third schematic diagram of the first connecting line and the second connecting line in one embodiment of the ultrasound device provided by the present invention. DETAILED DESCRIPTION

[0090] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0091] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0092] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0093] The present invention provides an ultrasonic device, please refer to Figure 1 The ultrasound device includes an ultrasound probe 10, a transmit / receive sequence controller 20, an echo processing module 30, a processor 40, a display 50, and a memory 60. The transmit / receive sequence controller 20 is signal-connected to the ultrasound probe 10, which is signal-connected to the processor 40 via the echo processing module 30. An output of the processor 40 is signal-connected to the display 50.

[0094] The ultrasound probe 10 transmits ultrasound waves toward a region of interest A within biological tissue and receives ultrasound echoes. The ultrasound probe 10 includes at least one array element, which is used to transmit ultrasound waves or convert received ultrasound waves into electrical signals based on an excitation electrical signal output by the transmit / receive control circuit 120. Therefore, each array element can be used to transmit ultrasound waves toward a target of interest in biological tissue or to receive ultrasound echoes returned from the tissue. During ultrasound testing, transmit and receive sequences can be used to control which array elements are used for transmitting and which are used for receiving ultrasound waves, or to control the time slots used for transmitting and receiving ultrasound echoes. Array elements involved in ultrasound transmission can be excited simultaneously by electrical signals, thereby emitting ultrasound waves simultaneously; alternatively, array elements involved in ultrasound beam transmission can be excited by multiple electrical signals separated by a predetermined time interval, thereby continuously emitting ultrasound waves separated by a predetermined time interval. The ultrasound probe 10 can be a planar array probe or a volumetric probe. Volumetric probes can be abdominal or intracavitary.

[0095] The transmit / receive sequence controller 20 is used to control the ultrasound probe 10 to transmit an ultrasonic beam toward biological tissue and to control the ultrasound probe 10 to receive ultrasonic echoes reflected from the tissue. In a specific embodiment, the transmit / receive sequence controller 20 is used to generate a transmit sequence and / or a receive sequence and output the transmit sequence and / or receive sequence to the ultrasound probe 10, thereby controlling the ultrasound probe 10 to transmit ultrasonic waves toward the region of interest A and receive ultrasonic echoes. The transmit sequence controls some or all of the multiple array elements to transmit ultrasonic waves toward the target of interest in the biological tissue. The transmit sequence parameters include the number of array elements used for transmission and ultrasonic transmission parameters (e.g., amplitude, frequency, number of transmissions, transmission interval, transmission angle, waveform type, etc.). The receive sequence controls some or all of the multiple array elements to receive ultrasonic echoes after the tissue has passed through. The receive sequence parameters include the number of array elements used for reception and echo reception parameters (e.g., reception angle, depth, etc.). Depending on the application of the ultrasonic echo or the image generated based on the ultrasonic echo, the ultrasonic parameters in the transmit sequence and the echo parameters in the receive sequence may vary.

[0096] The echo processing module 30 is used to process ultrasonic echoes, such as by filtering, amplifying, and beamforming the ultrasonic echo signals. Ultrasonic echoes received by the ultrasonic probe 10 are processed by the echo processing module 30 and then output to the processor 40. Those skilled in the art will appreciate that, in some embodiments, the echo processing module 30 may be omitted when filtering, amplifying, beamforming, and other processing are not required.

[0097] The memory 60 is used to store programs and data, such as ultrasonic echo data or image data.

[0098] The processor 40 is used to execute programs or process data. In this embodiment, the processor is used to implement the display transformation of a three-dimensional ultrasound image. Specifically, it generates raw ultrasound three-dimensional volume data containing the measured object based on the ultrasound echo data; detects the orientation of the measured object from the raw ultrasound three-dimensional volume data based on the image features of the measured object; compares the orientation of the measured object with the expected orientation to obtain rotation transformation parameters in the three-dimensional coordinate system; performs a rotation transformation on the raw ultrasound three-dimensional volume data based on the rotation transformation parameters to obtain transformed three-dimensional volume data, and outputs the transformed three-dimensional volume data to a display for display to obtain an ultrasound image. The rotation transformation can be implemented by a rotation axis plus a rotation angle. Accordingly, the rotation transformation parameters include the position of the rotation axis and the rotation angle (such as the Euler angle); there can be multiple rotation axes and rotation angles. Of course, the rotation transformation can also be implemented by a rotation matrix. Accordingly, the rotation transformation parameters include the rotation matrix.

[0099] The image features include: image characteristics corresponding to the anatomical structures of one or more tissue structures on the object being measured in the three-dimensional ultrasound volume data. The image features may include color features, texture features, shape features, spatial relationship features, etc.

[0100] In one embodiment, see Figure 2 The system for implementing display transformation of a three-dimensional ultrasound image in an ultrasound device includes an acquisition unit 410, an orientation detection unit 420, a calculation unit 430, a transformation unit 440, and an image output unit 450. The functions of the system are all or partially completed by the processor 40.

[0101] The acquisition unit 410 is used to acquire original ultrasonic three-dimensional volume data containing the object under test.

[0102] The position detection unit 420 is used to detect the position of the object under test from the original ultrasonic three-dimensional volume data according to the image features of the object under test.

[0103] The calculation unit 430 is used to compare the orientation of the measured object with the expected orientation to obtain rotation transformation parameters in the three-dimensional coordinate system.

[0104] The transformation unit 440 is configured to perform a rotation transformation on the original ultrasonic three-dimensional volume data according to the rotation transformation parameters to obtain transformed three-dimensional volume data.

[0105] The image output unit 450 is configured to output the transformed three-dimensional volume data to a display to obtain an ultrasound image, that is, the ultrasound image corresponding to the three-dimensional volume data is viewed on the display.

[0106] Based on the above ultrasound equipment, the specific processing process of display transformation of three-dimensional ultrasound images is as follows: Figure 3 As shown, the following steps are included:

[0107] S10. The acquisition unit 410 acquires raw three-dimensional ultrasonic volume data containing the object under test; in other words, the raw three-dimensional ultrasonic volume data containing the object under test is generated based on the ultrasonic echo data. Specifically, the acquisition unit 410 generates multiple two-dimensional images based on the ultrasonic echo data obtained by scanning the ultrasonic probe 10 from multiple scanning planes. The acquisition unit 410 performs coordinate transformation on the multiple two-dimensional images based on the spatial positions of the multiple scanning planes of the ultrasonic probe 10, and interpolates the images to generate the raw three-dimensional ultrasonic volume data of the object under test. The acquisition unit 410 may also perform image optimization processing on the generated raw three-dimensional ultrasonic volume data, such as smoothing and denoising, to facilitate subsequent processing.

[0108] S20 , the position detection unit 420 detects the position of the object under test from the original ultrasonic three-dimensional volume data according to the image features of the object under test.

[0109] S30 , the calculation unit 430 compares the orientation of the measured object with the expected orientation to obtain rotation transformation parameters in the three-dimensional coordinate system.

[0110] S40: Transformation unit 440 performs a rotational transformation on the original ultrasound 3D volume data according to the rotational transformation parameters to obtain transformed 3D volume data. Transformation unit 440 can also be used to perform cropping, image editing, and volume data segmentation on the 3D volume data. Cropping includes VOI cropping, plane cropping, geometric cropping, and erasing (erasing).

[0111] S50, the image output unit 450 outputs the transformed three-dimensional volume data to the display 50 for display to obtain an ultrasound image. Figure 4 and Figure 5 When the original ultrasound three-dimensional volume data is not rotated, the image on the display 50 is as follows: Figure 4 As shown in FIG, the position of the fetus's face is not facing the user, resulting in the left face being completely blocked. By using the ultrasound device provided in this embodiment, the automatic rotation of the three-dimensional volume data can be achieved to obtain Figure 5 The facial image shown enables the user to see the face of the fetus, Figure 5 The fetus's face is tilted 45 degrees to the side, allowing most of the facial features to be seen, with clear outlines and a well-defined central contour. This allows the ultrasound 3D volume data of the subject to be automatically rotated to the desired orientation, eliminating the need for manual adjustment by the doctor and improving the efficiency of ultrasound examinations.

[0112] The desired orientation can be pre-set by the user, a default setting can be used, or an optimal orientation determined based on the current raw 3D volume data. The desired orientation can specifically include a preset viewing angle. The optimal orientation is determined based on the current raw 3D volume data. For example, the optimal orientation can be the orientation that fully displays the subject in the display window of the display 50. Specifically, the desired orientation can be the orientation when the ultrasound image of the subject is displayed facing the user in the display window (frontal orientation), i.e., a frontal viewing angle; it can also be the orientation when the 3D volume data of the subject is displayed sideways to the user in the display window (side orientation), i.e., a left or right viewing angle; or it can be the orientation when the ultrasound image of the subject is displayed with the top facing the user in the display window (top-down orientation), i.e., a top-down viewing angle. Of course, there can be multiple desired orientations, for example, three desired orientations can be set, namely, a frontal orientation, a side orientation, and a top-down orientation. When there are multiple desired orientations, the ultrasound images of each orientation can be displayed sequentially according to the user's selection or a preset order.

[0113] Furthermore, the 3D ultrasound image display transformation system also includes a position detection unit 460. Position detection unit 460 detects the position of the object under test from the original 3D ultrasound volume data based on the image features of the object under test, either before or after the transformation unit 440 obtains the transformed 3D volume data. Calculation unit 430 determines the relative position of the object under test within the display window based on the position of the object under test, compares the relative position of the object under test with the desired position of the object under test within the display window, and obtains a displacement vector or coordinate difference in the 3D coordinate system. Transformation unit 440 then shifts the 3D volume data based on the displacement vector or coordinate difference, translating the object under test to the desired position within the display window. The user simply needs to set the desired position of the object under test within the display window to adjust and shift the position of the 3D ultrasound image. Combined with the aforementioned automatic rotation, this allows for diverse display transformations of 3D ultrasound images to meet the diverse ultrasound examination needs of users. Similarly, the desired position can be pre-set or determined as the optimal position based on the current original 3D volume data. For example, the desired position is the position where the object under test is directly in the center of the display window. In this embodiment, the position of the measured object is the position coordinates of the measured object in the three-dimensional coordinate system. By setting the three-dimensional coordinate system to a three-dimensional coordinate system with the display window as a reference, the process of "determining the relative position of the measured object in the display window based on the position of the measured object" can be omitted, thus simplifying the processing flow.

[0114] The orientation detection unit 420 detects the orientation of the object under test from the raw three-dimensional ultrasound volume data based on the image features of the object under test, and the position detection unit 460 detects the position of the object under test from the raw three-dimensional ultrasound volume data based on the image features of the object under test, and these methods may be the same or different. For example, in the first embodiment, the orientation detection unit 420 detects the orientation of the object under test from the raw three-dimensional ultrasound volume data based on the image features of the object under test, specifically using the following method: the orientation detection unit 420 inputs the raw three-dimensional ultrasound volume data into a machine learning model to obtain the orientation of the object under test. The machine learning model is trained using samples that have been labeled with the correspondence between the image features of the object under test and its orientation. The machine learning model can be trained using one or more of deep learning, support vector machines, random forests, and adaboost.

[0115] Similarly, the position detection unit 460 can also use the above method to detect the position of the object to be measured. Specifically: the position detection unit 460 inputs the original ultrasonic three-dimensional data into the machine learning model to obtain the position of the object to be measured. The machine learning model is trained using samples of the correspondence between the image features and positions of the marked object to be measured.

[0116] In a second embodiment, the position detection unit 420 detects the position of the object under test from the raw three-dimensional ultrasound volume data based on the image features of the object under test. Specifically, the position detection unit 420 automatically extracts one or more tissue structures from the raw three-dimensional ultrasound volume data based on the image features of the object under test, and obtains the position of the object under test based on the extracted tissue structures. The automatic extraction of the one or more tissue structures can be performed using an image processing algorithm, including one or more of a template matching algorithm, an edge extraction algorithm, an image transformation algorithm, a morphological operation algorithm, and an image segmentation algorithm. For example, the one or more tissue structures can be extracted using an image segmentation algorithm, including one or more of a graphcut algorithm, an active contour model algorithm, and an active shape model algorithm. The extraction of the one or more tissue structures can also be performed by constructing a mathematical model of the object under test from the raw three-dimensional ultrasound volume data based on the image features of the object under test using an image processing algorithm, and analyzing the raw three-dimensional ultrasound volume data using the mathematical model to extract the one or more tissue structures of the object under test.

[0117] Similarly, the position detection unit 460 automatically extracts one or more tissue structures from the original ultrasonic three-dimensional volume data according to the image features of the object to be measured, and obtains the position of the object to be measured according to the extracted tissue structures.

[0118] In a third embodiment, the ultrasound device may further include a human-computer interaction device, such as a trackball, mouse, keyboard, touch screen, etc. The orientation detection unit 420 detects the orientation of the object under test from the original ultrasound three-dimensional volume data based on the image features of the object under test. Specifically, the orientation detection unit 420 outputs the original ultrasound three-dimensional volume data to a display for display to obtain an ultrasound image, detects one or more marker points input by the user on the ultrasound image through the human-computer interaction device, and obtains the orientation of the object under test based on the marker points. The one or more marker points correspond to one or more tissue structures of the object under test on the ultrasound image. That is, in the third embodiment, the identification of one or more tissue structures of the object under test is completed by the user through the human-computer interaction device, which is a semi-automatic detection mode (the first and second embodiments are fully automatic detection).

[0119] Similarly, the position detection unit 460 outputs the original ultrasonic three-dimensional data to the display for display to obtain an ultrasonic image, detects one or more marker points input by the user on the ultrasonic image, and obtains the position of the object under test based on the marker points.

[0120] In a fourth embodiment, the display transformation system for a three-dimensional ultrasound image can also utilize the methods for obtaining the orientation or position of the object described in the two or three preceding embodiments. Specifically, the display transformation system described in the fourth embodiment can utilize a corresponding method to obtain the orientation and position of the object, based on a user's selection. Using multiple methods to determine the orientation or position of the object can improve accuracy.

[0121] See also Figure 6 and Figure 7 , the region of interest A can be various organs, and the object to be measured corresponds to the part of the organ that needs to be examined. In this embodiment, the region of interest A is the uterus, and the object to be measured is the fetal face. Accordingly, the image features of the fetal face include: image characteristics corresponding to at least two tissue structures located on the fetal face. The at least two tissue structures can be selected from the fetal eyes, fetal nose, fetal mouth, fetal forehead, fetal chin, fetal cheeks, fetal face contour and fetal ears. The display transformation system identifies the orientation of the fetal face in the three-dimensional volume data based on the position of the image features of the fetal face, and can also identify the relative position of the fetal face in the display window (that is, the coordinates of the fetal face in the three-dimensional coordinate system).

[0122] The orientation includes the front orientation and the top orientation of the object being measured. In this embodiment, the orientation includes the orientation of the fetus's face and the orientation of the top of the fetus's head.

[0123] Taking the fetal face as an example, the specific process of display transformation of the three-dimensional ultrasound image includes:

[0124] S10 , the acquiring unit 410 acquires original ultrasonic three-dimensional volume data including the fetus's face.

[0125] S20 , the position detection unit 420 detects the position of the fetus' face from the original three-dimensional ultrasonic volume data according to the image features of the fetus' face.

[0126] S40 , the transformation unit 440 rotates the orientation of the fetus' face to obtain transformed three-dimensional volume data.

[0127] S50 , the image output unit 450 outputs the transformed three-dimensional volume data to the display 50 , which displays the transformed three-dimensional volume data to obtain an ultrasound image of a preset viewing angle.

[0128] Before step S40 , the process further includes the following steps: the image output unit 450 outputs the original three-dimensional ultrasonic volume data to the display 50 , and the display 50 displays the original three-dimensional ultrasonic volume data to obtain a first ultrasonic image. That is, the user sees the first ultrasonic image reflecting the original three-dimensional ultrasonic volume data through the display 50 .

[0129] Step S40 specifically includes: the transformation unit 440 receives a first rotation instruction generated when the user inputs one or more marker points on the first ultrasound image through the human-computer interaction device; according to the first rotation instruction, the rotation center axis is established with the one or more marker points, the orientation of the fetal face is rotated, and the three-dimensional volume data corresponding to the fetal face at a preset viewing angle is formed as the transformed three-dimensional volume data.

[0130] Step S50 specifically includes: the image output unit 450 outputs the three-dimensional volume data corresponding to the fetal face at a preset viewing angle to the display 50, and the display 50 displays the three-dimensional volume data, thereby obtaining an ultrasound image at the preset viewing angle. The preset viewing angle includes at least one of the following: the front of the fetal face, the side of the fetal face, and the front of the fetal face at a 45-degree angle.

[0131] The one or more landmark points correspond to one or more tissue structures among the fetal eyes, fetal nose, fetal mouth, fetal forehead, fetal chin, fetal cheek and fetal ear on the first ultrasound image.

[0132] The aforementioned rotation instructions are automatically generated based on the landmarks. Of course, the rotation instructions can also be directly input by the user. For example, before step S40, the transformation unit 440 receives a second rotation instruction input by the user via the human-computer interaction device. Then, in step S40, the transformation unit 440 rotates the orientation of the fetal face according to the second rotation instruction to obtain the transformed three-dimensional volume data.

[0133] The second rotation instruction can correspond to one or more preset viewing angles. For example, the second rotation instruction corresponds to the front of the fetal face, the 45-degree angle in front of the fetal face, and the side of the fetal face. Three corresponding buttons are set on the human-computer interaction device, for example, buttons marked with 0°, 45°, and 90°. The user presses the 0° button. Since the 0° button corresponds to the preset angle of 45 degrees in front of the fetal face, the transformation unit 440 rotates the orientation of the fetal face so that the user can see the ultrasound image corresponding to the 45-degree angle in front of the fetal face on the display 50. The operation of the 45° button and the 90° button is similar. Of course, only one button can be set to cycle through the above three preset angles according to the number of times the button is pressed.

[0134] See also Figure 6 The position detection unit 420 obtains the position of the fetus' face according to the extracted tissue structure or the aforementioned landmarks, specifically including:

[0135] The position detection unit 420 obtains a first line L1 based on the detected fetal eyes. The eyes include the corners of both eyes. For example, in one embodiment, the position detection unit 420 connects the corners of both eyes to obtain the first line L1. Of course, the detected fetal eyes can be automatically detected and extracted from the original three-dimensional ultrasound data, or can be based on user-entered landmarks indicating the fetal eye position on the ultrasound image.

[0136] The orientation detection unit 420 obtains the second line L2 based on any two of the midpoint of the first line L1, the fetal nose, and the fetal mouth. For example, in one embodiment, the fetal nose can be represented by the nose tip. The second line L2 is obtained by connecting the midpoint of the first line L1 and the nose tip of the fetal nose, or fitting a closest straight line, such as Figure 6 As shown. The fetal mouth can be represented by the corner of the mouth and / or the midpoint of the mouth. In other embodiments, the midpoint of the first line L1 is connected with the midpoint of the fetal mouth to obtain the second line L2, as shown in FIG. Figure 7 As shown. Other permutations and combinations are similar and will not be described in detail. Of course, you can also connect multiple points on the face contour line in the center of the fetus's face in the original ultrasound 3D data or fit a closest straight line to obtain a second line L2, as shown in FIG. Figure 8 shown.

[0137] The orientation detection unit 420 can obtain the orientation of the fetal face based on the first connecting line L1 and the second connecting line L2. Specifically, the orientation of the fetal face includes at least two of the left-right direction of the face, the up-down direction of the face (the direction of the top of the fetal head), and the front-back direction of the face (the direction of the fetal face). The orientation described in this embodiment includes the above three. The orientation detection unit 420 forms a plane with the first connecting line L1 and the second connecting line L2. The direction in which the normal of the plane extends outside the three-dimensional data is the orientation of the fetal face, or based on the plane and the feature that the tip of the nose is the highest point of the face, the orientation of the fetal face, that is, the front-back direction of the fetal face, can be determined. The orientation detection unit 420 can determine the left-right direction of the face based on the fetal face orientation and the two extension directions of the first connecting line L1. Similarly, the orientation detection unit 420 can determine the up-down direction of the face based on the left-right direction of the fetal face and the two extension directions of the second connecting line L2.

[0138] Regardless of which tissue structure is initially detected, the positional correspondence with other tissue structures can be identified based on the marker points of this tissue structure or automatically extracted, thereby detecting the position of the detected object in the original three-dimensional ultrasound volume data. For example, in the aforementioned embodiment, the first connecting line is derived from the detection of the fetal eyes. Of course, the first connecting line can also be obtained by replacing the fetal eyes with any one of the fetal nose, fetal forehead, fetal chin, fetal cheek, fetal ear, fetal facial contour, and fetal mouth, and the second connecting line can be obtained based on the remaining tissue structures to determine the position of the fetal face. In one embodiment, the position of the fetal face in the original three-dimensional ultrasound volume data is located and detected based on the combination of connecting lines corresponding to the positions of the anatomical structures of at least two tissue structures, including the fetal eyes, fetal nose, fetal mouth, fetal forehead, fetal chin, fetal cheek, fetal facial contour, and fetal ear, in the three-dimensional ultrasound volume data.

[0139] The aforementioned ultrasound image includes a virtual rendering of the fetal face. Image output unit 450 renders the original ultrasound 3D volume data or the transformed 3D volume data, draws the virtual rendering based on the transformed 3D volume data, and outputs the virtual rendering to display 50 for display. Thus, the user can view the virtual rendering reflecting the fetal facial features on display 50.

[0140] Furthermore, the aforementioned ultrasound image also includes a cross-sectional view of a clinically standard section of the fetal face; the image output unit 450 extracts the clinically standard section of the fetal face based on the original three-dimensional volume data, draws and obtains cross-sectional view data of the clinically standard section of the fetal face, and outputs the aforementioned cross-sectional view data to the display 50 for display to obtain a cross-sectional view of the clinically standard section of the fetal face. The clinically standard section of the fetal face can be one or more of a horizontal transverse section of the eye orbits, a midline sagittal section, a frontal coronal section, and a nasolabial coronal section. The cross-sectional view can be a cross-sectional view, a sagittal section, a coronal section, or a section view at any other angle. The image output unit 450 can also perform virtual rendering on the cross-sectional view to obtain a corresponding rendering output display.

[0141] Furthermore, the three-dimensional ultrasound image display transformation system also includes a settings unit (not shown), which is responsible for setting the operating modes and parameters of other units in the system. Specifically, the settings unit provides a selection function for whether to enable the transformation unit 440 to rotate, transform, and translate the original three-dimensional ultrasound volume data. If enabled, it also selects whether to enable the image output unit 450 to obtain the transformed three-dimensional volume data. After receiving the user's selection instruction, the corresponding activation or deactivation operation is performed. The settings unit also provides a selection function for whether to enable the orientation detection unit 420 / position detection unit 460 to detect the orientation and / or position of the measured object before rotating and / or translating the three-dimensional volume data. If a detection step is required, different detection modes are selected, such as different detection targets (tissue structure, landmarks, facial position, facial orientation, etc.), different detection methods (image processing method, image segmentation method, machine learning method, whether to construct a facial model, etc.), whether to use fully automatic detection or semi-automatic detection, and what information the user needs to specify during semi-automatic detection.

[0142] The ultrasound device may also include an adjustment unit (not shown in the figure), which provides the user with the function of manually adjusting the virtual rendering and the cross-sectional view of the clinical standard section of the fetal face. Specifically, the adjustment unit is used to adjust the preset viewing angle (the viewing angle of the virtual rendering) according to the instructions input by the user, such as adjusting from the current viewing angle to the front of the fetal face, the side of the fetal face, the perspective of looking down / looking up at the fetal face, and the perspective formed by deflecting a certain angle based on these perspectives and their combinations. The adjustment unit can also adjust the cross-sectional view of the clinical standard section of the fetal face according to the instructions input by the user, for example, by rotating and / or moving the three-dimensional volume data, thereby adjusting the angle and / or position of the cross-sectional view to obtain a better standard section cross-sectional view.

[0143] Those skilled in the art will appreciate that all or part of the functions of the various methods in the above-mentioned embodiments can be implemented by means of hardware (such as the above-mentioned processor), or by means of a computer program. When all or part of the functions in the above-mentioned embodiments are implemented by means of a computer program, the program can be stored in a computer-readable storage medium, and the storage medium can include: a read-only memory, a random access memory, a disk, an optical disk, a hard disk, etc., and the program is executed by a computer to implement the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions in the above-mentioned embodiments can be implemented. In addition, when all or part of the functions in the above-mentioned embodiments are implemented by means of a computer program, the program can also be stored in a storage medium such as a server, another computer, a disk, an optical disk, a flash drive or a mobile hard disk, and can be saved in the memory of the local device by downloading or copying, or the system of the local device is updated to a version, and when the program in the memory is executed by the processor, all or part of the functions in the above-mentioned embodiments can be implemented.

[0144] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A method for displaying a three-dimensional ultrasound image, characterized in that: include: Acquire original ultrasound three-dimensional volume data containing the fetus's face; The orientation of the fetal face in the original three-dimensional ultrasonic volume data is determined based on image features of the fetal face, where the orientation of the fetal face includes the orientation of the fetal face and the orientation of the top of the fetal head; wherein the image features include image characteristics corresponding to anatomical structures of one or more tissue structures on the fetal face in the three-dimensional ultrasonic volume data, wherein the one or more tissue structures are selected from fetal eyes, fetal nose, fetal forehead, fetal chin, fetal cheeks, fetal ears, fetal facial contour, and fetal mouth; wherein determining the orientation of the fetal face in the original three-dimensional ultrasonic volume data based on the image features of the fetal face is specifically implemented in one of the following ways: Outputting the original ultrasonic three-dimensional volume data to a display for display to obtain an ultrasonic image, detecting one or more marker points input by a user on the ultrasonic image, wherein the one or more marker points correspond to one or more tissue structures on the fetal face on the ultrasonic image; obtaining a first connecting line based on the fetal eyes; obtaining a second connecting line based on any two of the midpoint of the first connecting line, the fetal nose, and the fetal mouth, or obtaining a second connecting line based on multiple points on the fetal face contour in the center of the fetal face; obtaining the orientation of the fetal face based on the first connecting line and the second connecting line; or, Automatically extract one or more tissue structures from the original ultrasound three-dimensional volume data based on the image features of the fetal face; obtain a first connecting line based on the detected fetal eyes; obtain a second connecting line based on any two of the midpoint of the first connecting line, the fetal nose, and the fetal mouth, or obtain a second connecting line based on multiple points on the fetal face contour in the center of the fetal face; obtain the orientation of the fetal face based on the first connecting line and the second connecting line; or, The orientation of the fetal face is obtained by inputting the original ultrasound three-dimensional volume data into a machine learning model, wherein the machine learning model is trained using samples with labeled correspondences between image features of the fetal face and the orientation; obtaining an ultrasonic image of the fetal face at a preset viewing angle based on the orientation of the fetal face; An ultrasound image of the fetus's face at a preset viewing angle is displayed.

2. The method according to claim 1, wherein: The preset viewing angle includes at least one of the front of the fetus' face, the side of the fetus' face, and a 45-degree angle diagonally in front of the fetus' face.

3. The method according to claim 1, wherein Obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes: rotating the original three-dimensional ultrasonic volume data according to the orientation of the fetus' face so that the current viewing angle of the rotated original three-dimensional ultrasonic volume data is the preset viewing angle; The rotated original ultrasonic three-dimensional volume data is rendered at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

4. The method according to claim 1, wherein Obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes: adjusting the current viewing angle of the original ultrasonic three-dimensional volume data to the preset viewing angle according to the orientation of the fetus' face; The original ultrasonic three-dimensional volume data is rendered at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

5. The method according to claim 1, wherein Also includes: The position of the fetal face is detected from the original ultrasonic three-dimensional volume data based on the image features of the fetal face; the relative position of the fetal face in the display window is determined based on the position of the fetal face, and the relative position of the fetal face is compared with the expected position of the fetal face in the display window to obtain a displacement vector or coordinate difference in the three-dimensional coordinate system; the original ultrasonic three-dimensional volume data is coordinate transformed according to the displacement vector or coordinate difference, so that the fetal face is translated to the expected position in the display window.

6. An ultrasonic device, characterized in that include: monitor; An ultrasonic probe, used for transmitting ultrasonic waves to a region of interest in biological tissue and receiving echoes of the ultrasonic waves; A transmit / receive sequence controller is used to generate a transmit sequence and / or a receive sequence, output the transmit sequence and / or the receive sequence to the ultrasound probe, and control the ultrasound probe to transmit ultrasound to the region of interest and receive ultrasound echoes; Processor for: generating original ultrasound three-dimensional volume data including the fetal face according to the ultrasound echo data; The orientation of the fetal face in the original three-dimensional ultrasonic volume data is determined based on image features of the fetal face, where the orientation of the fetal face includes the orientation of the fetal face and the orientation of the top of the fetal head; wherein the image features include image characteristics corresponding to anatomical structures of one or more tissue structures on the fetal face in the three-dimensional ultrasonic volume data, wherein the one or more tissue structures are selected from fetal eyes, fetal nose, fetal forehead, fetal chin, fetal cheeks, fetal ears, fetal facial contour, and fetal mouth; wherein determining the orientation of the fetal face in the original three-dimensional ultrasonic volume data based on the image features of the fetal face is specifically implemented in one of the following ways: The processor outputs the original ultrasonic three-dimensional volume data to the display for display to obtain an ultrasonic image, detects one or more landmark points input by the user on the ultrasonic image, and the one or more landmark points correspond to one or more tissue structures of the fetal face on the ultrasonic image; obtains a first connecting line based on the fetal eyes; obtains a second connecting line based on any two of the midpoint of the first connecting line, the fetal nose, and the fetal mouth, or obtains a second connecting line based on multiple points on the fetal face contour in the center of the fetal face; obtains the orientation of the fetal face based on the first connecting line and the second connecting line; or, The processor automatically extracts one or more tissue structures from the original ultrasonic three-dimensional volume data based on image features of the fetal face; obtains a first connecting line based on detected fetal eyes; obtains a second connecting line based on the midpoint of the first connecting line, any two of the fetal nose and the fetal mouth, or obtains the second connecting line based on multiple points on the fetal facial contour in the center of the fetal face; obtains the orientation of the fetal face based on the first connecting line and the second connecting line; or, the processor inputs the original ultrasonic three-dimensional volume data into a machine learning model to obtain the orientation of the fetal face, wherein the machine learning model is trained using samples with labeled correspondences between image features of the fetal face and orientations; obtaining an ultrasonic image of the fetal face at a preset viewing angle based on the orientation of the fetal face; An ultrasound image of the fetus's face at a preset viewing angle is displayed.

7. The ultrasonic device according to claim 6, wherein The preset viewing angle includes at least one of the front of the fetus' face, the side of the fetus' face, and a 45-degree angle diagonally in front of the fetus' face.

8. The ultrasonic device according to claim 6, wherein The processor obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes: The processor rotates the original three-dimensional ultrasonic volume data according to the orientation of the fetus' face so that the current viewing angle of the rotated original three-dimensional ultrasonic volume data is the preset viewing angle; The processor renders the rotated original ultrasonic three-dimensional volume data at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

9. The ultrasonic device according to claim 6, wherein The processor obtaining an ultrasound image of the fetal face at a preset viewing angle based on the orientation of the fetal face includes: The processor adjusts the current viewing angle of the original ultrasonic three-dimensional volume data to the preset viewing angle according to the orientation of the fetus' face; The processor renders the original ultrasonic three-dimensional volume data at the preset viewing angle to obtain an ultrasonic image of the fetus' face.

10. The ultrasonic device according to claim 6, wherein The processor is also used to: detect the position of the fetal face from the original ultrasonic three-dimensional volume data based on the image features of the fetal face; determine the relative position of the fetal face in the display window based on the position of the fetal face, compare the relative position of the fetal face with the expected position of the fetal face in the display window, and obtain a displacement vector or coordinate difference in the three-dimensional coordinate system; move the three-dimensional volume data according to the displacement vector or coordinate difference so that the fetal face is translated to the expected position in the display window.

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