JP2007313199A - Ultrasonic diagnosis system, method for collecting ultrasonic images, and program for controlling this ultrasonic diagnosis system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic diagnosis system which can improve a frame rate to prevent ultrasonic images from being lowered in quality. <P>SOLUTION: The ultrasonic diagnosis system comprises a transmitting/receiving section 3 and an image forming section 4, wherein the transmitting/receiving section 3 drives an ultrasonic probe 2 and transmits and receives an ultrasonic wave every certain number of scan lines to scan one certain range, while the section transmits and receives an ultrasonic wave every certain number of the other scan lines than those as scanned before to scan another certain range; and the image forming section 4 bases on one data from one certain scanning and another data from another certain scanning to form an ultrasonic image data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic diagnostic apparatus, and more particularly to ultrasonic scanning.

  The ultrasonic diagnostic apparatus scans a predetermined range while repeating transmission and reception of ultrasonic waves, and generates an ultrasonic image based on data obtained by the scanning. By scanning with ultrasonic waves, a so-called scanning surface is formed, and this scanning surface is composed of a plurality of scanning lines (ultrasonic lines).

  Some conventional ultrasonic diagnostic apparatuses can change the number of scanning lines constituting a scanning plane (for example, Patent Document 1). As the number of scanning lines constituting the scanning surface increases and the density of scanning lines increases, the image quality of the ultrasonic image obtained by the scanning improves. However, the frame rate depends on the number of scanning lines constituting the scanning plane, and the frame rate decreases as the number of scanning lines increases. On the other hand, the smaller the number of scanning lines and the lower the density of scanning lines, the higher the frame rate.

  Further, in order to improve the frame rate, the conventional ultrasonic diagnostic apparatus scans a predetermined range by reducing the number of scanning lines, and generates an ultrasonic image based on data obtained by the scanning. For example, a conventional ultrasonic diagnostic apparatus alternately scans adjacent scanning lines (hereinafter sometimes referred to as “alternate scanning” or “thinning-out scanning”), and is based on data obtained by actual scanning. Ultrasonic images were generated.

  This alternate scanning (thinning-out scanning) will be described with reference to FIG. FIG. 7 is a schematic diagram illustrating scanning lines in which ultrasonic waves are transmitted and received by alternate scanning. Here, a case where a two-dimensional scanning surface is scanned will be described.

  For example, in the first scan (scan), ultrasonic waves are transmitted / received along odd-numbered scan lines 101, 103, 105, 107, 109, and 111 (solid-line scan lines), and a predetermined range 100 is scanned. An ultrasonic image is generated based on data obtained by scanning. In the second scan, the predetermined range 100 was scanned by transmitting and receiving ultrasonic waves along even-numbered scanning lines 102, 104, 106, 108, and 110 (dashed scanning lines). An ultrasonic image was generated based on the data. In other words, in the first and second scans, adjacent scanning lines are alternately scanned, and an ultrasonic image is generated based on data obtained by actual scanning.

  By alternately scanning the odd-numbered and even-numbered scanning lines, it is only necessary to scan half of the scanning lines, so that the frame rate can be improved. However, since the ultrasonic image is generated based on the data obtained by scanning half of the scanning lines, there is a problem that the amount of data is halved, and the image quality of the ultrasonic image is lowered accordingly. .

  As described above, the frame rate can be improved by performing the alternate scan (thinning-out scan). However, since the ultrasonic image was generated using only the data obtained in the actual scan, the amount of data There is a problem that the image quality of the ultrasonic image is lowered.

JP-A-9-192130

  The present invention solves the above-described problem, and provides an ultrasonic diagnostic apparatus, an ultrasonic image collecting method, and an ultrasonic diagnostic apparatus capable of preventing deterioration in image quality of an ultrasonic image while improving a frame rate. An object is to provide a control program.

  According to the first aspect of the present invention, a scanning unit that sequentially transmits and receives ultrasonic waves every predetermined number of scanning lines and acquires received data by scanning a predetermined range; a storage unit that stores the received data; Image generating means for generating ultrasonic image data based on the received data, and the scanning means for scanning lines different from the scanning lines scanned to obtain the received data stored in the storage means, The ultrasonic wave is sequentially transmitted and received every predetermined number of scanning lines, and another reception data is acquired by scanning the predetermined range, and the image generation unit includes the reception data stored in the storage unit and the reception data. An ultrasonic diagnostic apparatus that generates ultrasonic image data based on other received data.

  According to a sixth aspect of the present invention, there is provided a first scanning step of acquiring reception data by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines and scanning a predetermined range; Receiving data by scanning the predetermined range by sequentially transmitting and receiving ultrasonic waves for every predetermined number of scanning lines with respect to the storing step for storing and the scanning lines different from the scanning lines scanned in the first scanning step. A second scan step of acquiring ultrasonic image data based on the reception data stored in the storage means and the reception data obtained in the second scan step; And repeating the first scan step, the storage step, the second scan step, and the image generation step. It is a collection method of the image.

  The invention according to claim 7 is a first scanning function for acquiring received data by sequentially transmitting and receiving ultrasonic waves to an ultrasonic diagnostic apparatus every predetermined number of scanning lines and scanning a predetermined range; For the storage function for storing the received data in the storage means and the scanning lines different from the scanning lines scanned by the first scanning function, ultrasonic waves are sequentially transmitted and received every predetermined number of scanning lines, and the predetermined range is set. Based on the second scan function for acquiring received data by scanning, the received data stored in the storage means, and the received data obtained by the second scan function, ultrasonic image data is obtained. An ultrasonic diagnostic apparatus control program that repeatedly executes an image generation function to be generated.

  According to the present invention, the frame rate can be improved by scanning a predetermined range by transmitting and receiving ultrasonic waves every predetermined number of scanning lines. Furthermore, by generating ultrasonic image data based on reception data obtained by a predetermined scan and reception data obtained by scanning a scan line different from the scan line scanned by the scan, Since the decrease in the data amount can be suppressed, it is possible to prevent the image quality of the ultrasonic image from being deteriorated.

(Constitution)
The configuration of the ultrasonic diagnostic apparatus according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of an ultrasonic diagnostic apparatus according to an embodiment of the present invention.

  The ultrasonic diagnostic apparatus 1 according to this embodiment performs alternate scanning (thinning-out scanning), data on a scanning line in which ultrasonic waves are transmitted and received in a predetermined scan (scanning), and ultrasonic waves are not transmitted and received in the scanning Ultrasonic image data is generated on the basis of the data on the scanning line that is the scanning line and the ultrasonic wave is transmitted and received in the scan before the scanning. In other words, the ultrasonic diagnostic apparatus 1 scans ultrasonic image data based on data obtained by scanning a predetermined scanning line and data on the scanning line and scanning line different from the scanning line scanned by the scanning. Generate.

  For example, the ultrasonic diagnostic apparatus 1 scans a predetermined range by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines, and generates ultrasonic image data based on data obtained by the scanning. Next, the ultrasonic diagnostic apparatus 1 scans a predetermined range by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines with respect to the scanning lines in which ultrasonic waves were not transmitted and received in the previous scan. Ultrasonic image data is generated based on the data obtained in step 1 and the data obtained in the previous scan. In other words, the ultrasonic diagnostic apparatus 1 scans a predetermined range by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines with respect to scanning lines different from the scanning lines in which ultrasonic waves were transmitted and received in the previous scan, Ultrasonic image data is generated based on the data obtained by the predetermined scan and the data obtained by the previous scan. Thereafter, the alternating scan is repeated, and the ultrasonic image data is generated by using the data obtained in the previous scan for the data on the scan line in which the ultrasonic wave was not transmitted / received in the predetermined scan.

  As described above, by executing the alternate scan, the time required for one scan is shortened, so that the frame rate is improved. Furthermore, for scan lines where ultrasound was not transmitted / received, generation of ultrasound image data using data on the scan line where ultrasound was transmitted / received in the previous scan can suppress the reduction in data volume. As a result, it is possible to suppress degradation of the image quality of the ultrasonic image. Hereinafter, each part of the ultrasonic diagnostic apparatus 1 will be described.

  The ultrasonic probe 2 has a so-called one-dimensional ultrasonic probe in which ultrasonic transducers are arranged in a predetermined direction (scanning direction) or a so-called two-dimensional type in which ultrasonic transducers are arranged in a matrix (lattice). An ultrasonic probe is used.

  The transmission / reception unit 3 includes a transmission unit and a reception unit (not shown). The transmission unit supplies an electrical signal to the ultrasonic probe 2 according to a control signal output from the control unit 6 to generate an ultrasonic wave. The control signal output from the control unit 6 includes an alternating scan condition. This alternate scan condition includes information indicating the range in which alternate scan is performed (the angle of the center line of the range and the spread angle of the range), and the thinning ratio (scan line density) in the region. ing. The thinning ratio is information indicating how many scanning lines are used to transmit / receive ultrasonic waves. For example, when ultrasonic waves are transmitted / received every two scanning lines, the thinning ratio is ½, and when ultrasonic waves are transmitted / received every four scanning lines, the thinning ratio is ¼. .

  The transmission / reception unit 3 drives the ultrasonic probe 2 according to the control signal output from the control unit 6 to transmit / receive ultrasonic waves every predetermined number of scanning lines and scan a predetermined range. In the next scan, the transmission / reception unit 3 transmits / receives ultrasonic waves every predetermined number of scanning lines to / from scanning lines that have not been transmitted / received in the previous scan, thereby scanning a predetermined range. In other words, in the next scan, the transmission / reception unit 3 scans a predetermined range by transmitting / receiving ultrasonic waves to / from a scanning line different from the scanning line transmitted / received in the previous scan. . Thereafter, the transmission / reception unit 3 scans a predetermined range by repeating alternate scanning.

  Here, a specific example of alternate scanning will be described with reference to FIGS. FIG. 2 is a table for explaining scanning lines to be actually scanned and data used for generating an ultrasonic image. Here, a case where a two-dimensional scanning surface is scanned with ultrasonic waves will be described.

  For example, a case where scanning is performed at a ratio of one scanning line out of two scanning lines will be described with reference to FIG. Hereinafter, this scan may be referred to as “1/2 scan” for convenience. As shown in FIG. 2A, in the first scan, the transmitting / receiving unit 3 drives the ultrasonic probe 2 to scan the odd-numbered scanning lines 101, 103, 105, 107, 109, 111 (in FIG. A predetermined range 100 is scanned by transmitting and receiving ultrasonic waves along a solid scanning line). That is, the transmission / reception unit 3 transmits / receives ultrasonic waves every two scanning lines. In the second scan, the transmission / reception unit 3 drives the ultrasonic probe 2 and ultrasonic waves along the even-numbered scanning lines 102, 104, 106, 108, and 110 (the broken-line scanning lines in FIG. 7). The predetermined range 100 is scanned by transmitting / receiving. Thereafter, scanning is alternately performed along the odd-numbered lines and even-numbered lines. That is, in the third scan, ultrasonic waves are again transmitted and received on the odd-numbered scanning lines, and in the fourth scan, ultrasonic waves are again transmitted and received on the even-numbered scanning lines. Thereafter, the first and second scans are sequentially repeated.

  As another example, a case where scanning is performed at a ratio of one scanning line out of four scanning lines will be described with reference to FIG. Hereinafter, this scan may be referred to as “¼ scan” for convenience. As shown in FIG. 2B, in the first scan, the transmission / reception unit 3 drives the ultrasonic probe 2 to transmit / receive ultrasonic waves along the first scanning line 101 and the fifth scanning line 105. Then, the predetermined range 100 is scanned. That is, the transmission / reception unit 3 transmits / receives ultrasonic waves every four scanning lines.

  In the second scan, the transmitter / receiver 3 drives the ultrasonic probe 2 to scan the second scan line 102 next to the first scan line 101 and the sixth scan line 105 next to the fifth scan line 105. The predetermined range 100 is scanned by transmitting and receiving ultrasonic waves along the scanning line 106.

  In the third scan, the transmitter / receiver 3 drives the ultrasonic probe 2 to scan the third scan line 103 next to the second scan line 102 and the seventh scan line 106 next to the sixth scan line 106. The predetermined range 100 is scanned by transmitting and receiving ultrasonic waves along the scanning line 107.

  In the fourth scan, the transmission / reception unit 3 drives the ultrasonic probe 2, and the fourth scanning line 104 adjacent to the third scanning line 103 and the eighth scanning line 107 adjacent to the seventh scanning line 107. A predetermined range 100 is scanned by transmitting and receiving ultrasonic waves along the scanning line 108. Thereafter, the first to fourth scans are sequentially repeated.

  As described above, by transmitting and receiving ultrasonic waves every predetermined number of scanning lines and scanning a predetermined range, the time required for one scan can be shortened and the frame rate can be improved.

  The transmission unit includes a clock generation circuit, a transmission delay circuit, and a pulsar circuit. The clock generation circuit is a circuit that generates a clock signal that determines the transmission timing and transmission frequency of the ultrasonic signal. The transmission delay circuit is a circuit that performs transmission focus with a delay when transmitting ultrasonic waves. The pulsar circuit incorporates pulsars corresponding to the number of individual paths (channels) corresponding to each ultrasonic transducer, generates a drive pulse at a delayed transmission timing, and each ultrasonic transducer of the ultrasonic probe 2 To supply.

  The reception unit of the transmission / reception unit 3 includes a preamplifier circuit, an A / D conversion circuit, and a reception delay / addition circuit. The preamplifier circuit adjusts the gain of the echo signal output from each ultrasonic transducer of the ultrasonic probe 2. The A / D converter circuit A / D converts the amplified echo signal. The reception delay / adder circuit gives a delay time necessary for determining the reception directivity to the echo signal after A / D conversion, and adds the delay time. By the addition, the reflection component from the direction according to the reception directivity is emphasized.

  The image generation unit 4 includes a digital receiver 41, a signal processing unit 42, a DSC 43, and an image control unit 44, and generates ultrasonic image data based on the data output from the transmission / reception unit 3.

  The digital receiver 41 receives data output from the transmission / reception unit 3 and mainly performs processing such as filter processing and digital gain adjustment.

  The signal processing unit 42 includes a B-mode processing unit, a Doppler processing unit, or a CFM processing unit. The data output from the digital receiver 4 is subjected to predetermined processing in any processing circuit. The B-mode processing circuit visualizes echo amplitude information and generates B-mode ultrasonic raster data from the echo signal. The Doppler processing circuit extracts the Doppler shift frequency component and further performs FFT processing or the like to generate data having blood flow information. The color mode processing circuit visualizes the moving blood flow information and generates color ultrasonic raster data. Blood flow information includes information such as speed, dispersion, and power, and blood flow information is obtained as binarized information.

  A DSC 43 (Digital Scan Converter) converts ultrasonic raster data into image data represented by orthogonal coordinates (scan conversion processing) in order to obtain an image represented by an orthogonal coordinate system. Image data is output from the DSC 43 to the display unit 5, and an image based on the image data is displayed on the display unit 5. For example, the DSC 43 generates tomographic image data as two-dimensional information based on the B-mode ultrasonic raster data, and outputs the tomographic image data to the display unit 5. The display unit 5 displays a tomographic image based on the tomographic image data.

  The image controller 44 receives at least one of the data output from the transmitter / receiver 3, the data processed by the digital receiver 41, or the data processed by the signal processor 42 as the data storage unit 7. Remember me. Furthermore, when generating ultrasonic image data, the image control unit 44 acquires data from the data storage unit 7 and outputs the data to the digital receiver 41, the signal processing unit 42, or the DSC 43.

  The image generation unit 4 includes data on a scanning line in which ultrasonic waves are transmitted and received in a predetermined scan, and scanning lines in which ultrasonic waves are not transmitted and received in the scan, and ultrasonic waves are transmitted and received in a scan before the scan. Ultrasonic image data is generated based on the data on the scanning line. That is, the image generation unit 4 generates ultrasonic image data by using the data obtained in the previous scan for the data on the scan line in which the ultrasonic wave was not transmitted / received in the predetermined scan. In other words, the image generation unit 4 is a scan line that is different from the scan line in which the ultrasonic wave is transmitted / received in the scan and the scan line in which the ultrasonic wave is transmitted / received in the scan. Ultrasonic image data is generated based on the data on the scanning line in which ultrasonic waves are transmitted and received.

  For example, when a half scan is executed, the image generation unit 4 stores data obtained by the first scan in the data storage unit 7. Then, when data is obtained by the second scan, the image generation unit 4 generates ultrasonic waves based on the first data stored in the data storage unit 7 and the newly obtained second data. Generate image data. Further, the image generation unit 4 causes the data storage unit 7 to store data obtained by the second scan. Then, when data is obtained by the third scan, the image generation unit 4 generates ultrasonic waves based on the second data stored in the data storage unit 7 and the newly obtained third data. Generate image data. As described above, the ultrasonic image data is generated by using the data acquired by the previous scan for the data on the scanning line in which the ultrasonic waves are not transmitted and received by each scan. As a result, it is possible to suppress a decrease in the data amount, and it is possible to suppress a deterioration in the image quality of the ultrasonic image while improving the frame rate.

  Here, specific processing contents of the image generation unit 4 when the 1/2 scan is executed will be described with reference to FIG. As shown in FIG. 2A, data obtained in the first scan is data 101a, 103a, 105a, 107a,. These data correspond to data on odd-numbered scanning lines. Data 101a is data obtained as a result of transmitting / receiving ultrasonic waves along the scanning line 101, and data 103a, 105a, 107a,... Is also a result of transmitting / receiving ultrasonic waves along each odd-numbered scanning line. It is the obtained data.

  In addition, the data obtained in the second scan is referred to as data 102a, 104a, 106a, 108a,. These data correspond to data on even-numbered scanning lines. The data 102a is data obtained as a result of transmitting / receiving ultrasonic waves along the scanning line 102, and the data 104a, 106a, 108a,... Are also the results of transmitting / receiving ultrasonic waves along the even-numbered scanning lines. It is the obtained data.

  Thereafter, the data on the odd-numbered scan lines obtained by the third scan is data 101b, 103b, 105b, 107b,..., And the data on the even-numbered scan lines obtained by the fourth scan is Data 102b, 104b, 106b, 108b,.

  First, when data on the odd-numbered scanning lines is obtained by the first scan, the image control unit 44 stores the data (data on the odd-numbered scanning lines) obtained in the first scan in the data storage unit 7. Let In the example shown in FIG. 2A, the image control unit 44 causes the data storage unit 7 to store data 101a, 103a, 105a, 107a,. At this time, the image control unit 44 is the data before the processing by the digital receiver 41, the data after the processing of the digital receiver 41 and the data before the processing by the signal processing unit 42, or after the processing of the signal processing unit 42. , At least one of the data before processing by the DSC 43 is stored in the data storage unit 7.

  And the image generation part 4 produces | generates ultrasonic image data based on the data (data 101a, 103a, ...) obtained by the 1st scan. That is, the image generation unit 4 generates ultrasonic image data by performing processing of the digital receiver 41, the signal processing unit 42, and the DSC 43 on the first data output from the transmission / reception unit 3, Ultrasonic image data is output to the display unit 5. As a result, an ultrasonic image based on the first scan is displayed on the display unit 5.

  Next, when the data on the even-numbered scanning lines is obtained by the second scan, the image control unit 44 reads the data (data on the odd-numbered scanning lines) obtained from the first scan from the data storage unit 7. And output to any of the digital receiver 41, the signal processing unit 42, and the DSC 43. For example, if the data stored in the data storage unit 7 is data before processing by the digital receiver 41, the image control unit 44 outputs the data to the digital receiver 41 and data after processing by the digital receiver 41. If so, the image control unit 44 outputs the data to the signal processing unit 42, and if the data is processed by the signal processing unit 42, the image control unit 44 outputs the data to the DSC 43.

  Then, the image generation unit 4 generates ultrasonic image data based on the first data (data on the odd-numbered scanning lines) and the newly obtained second data (data on the even-numbered scanning lines). Is generated. That is, as shown in FIG. 2A, the image generation unit 4 has data (data 101a, 103a,...) Obtained by the first scan and data newly obtained by the second scan. Ultrasonic image data is generated based on (data 102a, 104a,...).

  For example, if the first data (data on the odd-numbered scanning lines) stored in the data storage unit 7 is data before processing by the digital receiver 41, the image control unit 44 sets the first data ( Data on odd-numbered scanning lines) is output to the digital receiver 41. The digital receiver 41 performs a predetermined process on the first data (data on the odd-numbered scanning lines) and the newly obtained second data (data on the even-numbered scanning lines). Data is output to the signal processing unit 42. Then, the signal processing unit 42 and the DSC 43 generate ultrasonic image data by performing predetermined processing on the data output from the digital receiver 41. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, an ultrasonic image based on the first scan and the second scan is displayed on the display unit 5.

  If the first data (data on odd-numbered scanning lines) is data before processing by the signal processing unit 42, the image control unit 44 uses the first data (data on odd-numbered scanning lines). The signal is output to the signal processing unit 42. The signal processing unit 42 performs a predetermined process on the first data (data on the odd-numbered scanning lines) and the newly obtained second data (data on the even-numbered scanning lines). Are output to the DSC 43. Then, the DSC 43 generates ultrasonic image data by performing predetermined processing on the data output from the signal processing unit 42. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, an ultrasonic image based on the first scan and the second scan is displayed on the display unit 5.

  Also, if the first data (data on the odd-numbered scanning lines) is the data after processing by the signal processing unit 42, the image control unit 44 uses the first data (data on the odd-numbered scanning lines). Output to the DSC 43. The DSC 43 performs a predetermined process on the first data (data on the odd-numbered scanning lines) and the newly obtained second data (data on the even-numbered scanning lines), thereby obtaining an ultrasonic image. Generate data. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, an ultrasonic image based on the first scan and the second scan is displayed on the display unit 5.

  Further, the image control unit 44 causes the data storage unit 7 to store newly obtained second data (data on the even-numbered scanning lines).

  When the data on the odd-numbered scanning lines is obtained by the third scan, the image generating unit 4 newly obtains the third data (data on the odd-numbered scanning lines: data 101b, 103b, 105b, ...) And second-time data (data on even-numbered scan lines) obtained by the previous scan, generate ultrasonic image data, and display the ultrasonic image data on the display unit 5 is output. Thereby, an ultrasonic image based on the second data and the third data is displayed on the display unit 5.

  Thereafter, when data is obtained by a new scan, the image generation unit 4 generates ultrasonic image data based on the newly obtained data and the data obtained by the previous scan, This process is repeated. Thereby, it is possible to suppress a decrease in the data amount due to the thinning scan, and it is possible to prevent a deterioration in the image quality of the ultrasonic image.

  Further, when the 1/4 scan is executed, the image generation unit 4 causes the data storage unit 7 to sequentially store the data obtained by the first, second, third, and fourth scans. Then, when the data is acquired by the second scan, the image generation unit 4 performs super processing based on the first data stored in the data storage unit 7 and the newly obtained second data. Sound image data is generated. When the data is obtained by the third scan, the image generating unit 4 is based on the first and second data stored in the data storage unit 7 and the newly obtained third data. Generate ultrasonic image data. Further, when data is obtained by the fourth scan, the image generation unit 4 stores the first, second, and third data stored in the data storage unit 7 and the newly obtained fourth data. Based on the above, ultrasonic image data is generated. As described above, the ultrasonic image data is generated by using the data acquired by the previous scan for the data on the scanning line in which the ultrasonic waves are not transmitted and received by each scan. As a result, it is possible to suppress a decrease in the data amount, and it is possible to suppress a deterioration in the image quality of the ultrasonic image while improving the frame rate.

  Here, specific processing contents of the image generation unit 4 when the 1/4 scan is executed will be described with reference to FIG. As shown in FIG. 2B, data obtained in the first scan is data 101a, 105a,. Data 101a is data obtained as a result of transmitting / receiving ultrasonic waves along the scanning line 101, and data 105a,... Is also data obtained as a result of transmitting / receiving ultrasonic waves along each scanning line.

  In addition, data obtained by the second scan is assumed to be data 102a, 106a,. The data 102a is data obtained as a result of transmitting / receiving ultrasonic waves along the scanning line 102, and the data 106a,... Is also data obtained as a result of transmitting / receiving ultrasonic waves along each scanning line.

  Further, data obtained by the third scan is data 103a, 107a,..., And data obtained by the fourth scan is data 104a, 108a,. The data 103a is data obtained as a result of transmitting / receiving ultrasonic waves along the scanning line 103, and the data 107a,... Is also data obtained as a result of transmitting / receiving ultrasonic waves along each scanning line.

  Hereinafter, data obtained by the fifth scan is referred to as data 101b, 105b,..., And data obtained by the sixth scan is referred to as data 102b, 106b,.

  First, when data is obtained by the first scan, the image control unit 44 causes the data storage unit 7 to store the data (data 101a, 105a,...) Obtained by the first scan. At this time, the image control unit 44 is the data before the processing by the digital receiver 41, the data after the processing of the digital receiver 41 and the data before the processing by the signal processing unit 42, or after the processing of the signal processing unit 42. , The data before processing by the DSC 43 is stored in at least one data storage unit 7.

  And the image generation part 4 produces | generates ultrasonic image data based on the data (data 101a, 105a, ...) obtained by the 1st scan. That is, the image generation unit 4 generates ultrasonic image data by performing processing of the digital receiver 41, the signal processing unit 42, and the DSC 43 on the first data output from the transmission / reception unit 3, Ultrasonic image data is output to the display unit 5. As a result, an ultrasonic image based on the first scan is displayed on the display unit 5.

  Next, when data (data 102a, 104a,...) Is obtained by the second scan, the image control unit 44 reads the data (data 101a, 105a,...) Obtained from the data storage unit 7 by the first scan. ... Are read out and output to any of the digital receiver 41, the signal processing unit 42, or the DSC 43. For example, if the data stored in the data storage unit 7 is data before processing by the digital receiver 41, the image control unit 44 outputs the data to the digital receiver 41 and data after processing by the digital receiver 41. If so, the image control unit 44 outputs the data to the signal processing unit 42, and if the data is processed by the signal processing unit 42, the image control unit 44 outputs the data to the DSC 43.

  Then, the image generation unit 4 generates ultrasonic image data based on the first data and the newly obtained second data. That is, as shown in FIG. 2B, the image generation unit 4 uses the data (data 101a, 105a,...) Obtained by the first scan and the data newly obtained by the second scan. Ultrasonic image data is generated based on (data 102a, 106a,...).

  For example, if the first data stored in the data storage unit 7 is data before processing by the digital receiver 41, the image control unit 44 outputs the first data to the digital receiver 41. The digital receiver 41 performs a predetermined process on the first data and the newly obtained second data, and outputs the processed data to the signal processing unit 42. Then, the signal processing unit 42 and the DSC 43 generate ultrasonic image data by performing predetermined processing on the data output from the digital receiver 41. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, ultrasonic image data based on the first scan and the second scan is generated on the display unit 5.

  Further, if the first data is data before processing by the signal processing unit 42, the image processing unit 44 outputs the first data to the signal processing unit 42. The signal processing unit 42 performs predetermined processing on the first data and the newly obtained second data, and outputs the processed data to the DSC 43. Then, the DSC 43 generates ultrasonic image data by performing predetermined processing on the data output from the signal processing unit 42. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, an ultrasonic image based on the first scan and the second scan is displayed on the display unit 5.

  If the first data is data after processing by the signal processing unit 42, the image control unit 44 outputs the first data to the DSC 43. The DSC 43 generates ultrasonic image data by performing predetermined processing on the first data and the newly obtained second data. Then, the image generation unit 4 outputs the generated ultrasonic image data to the display unit 5. Thereby, an ultrasonic image based on the first scan and the second scan is displayed on the display unit 5.

  In addition, the image control unit 44 causes the data storage unit 7 to store the newly obtained second data.

  When the data (data 103a, 107a,...) Is obtained by the third scan, the image generation unit 4 performs the newly obtained third data and the previously obtained first and second times. Ultrasonic image data is generated based on the data. For this purpose, the image control unit 44 reads the first data and the second data from the data storage unit 7 and outputs them to the digital receiver 41, the signal processing unit 42, or the DSC 43. Then, similarly to the first and second data described above, the image generation unit 4 generates ultrasonic image data based on the first, second, and third data, and displays the ultrasonic image data. Output to unit 5. As a result, ultrasonic images based on the first, second, and third data are displayed on the display unit 5. In addition, the image control unit 44 causes the data storage unit 7 to store the newly obtained third data.

  Further, when data (data 104a, 108a,...) Is obtained by the fourth scan, the image generation unit 4 performs the newly obtained fourth data and the first, second, and previously obtained data. And ultrasonic image data is generated based on the third data. For this purpose, the image control unit 44 reads the first, second, and third data from the data storage unit 7 and outputs the data to the digital receiver 41, the signal processing unit 42, or the DSC 43. The image generation unit 4 generates ultrasonic image data based on the first, second, third, and fourth data, and outputs the ultrasonic image data to the display unit 5. As a result, ultrasonic images based on the first, second, third, and fourth data are displayed on the display unit 5. In addition, the image control unit 44 causes the data storage unit 7 to store the newly obtained fourth data.

  Then, when data is obtained by the fifth scan, the image generation unit 4 and the second, third, and fifth data (data 101b, 105b,...) Obtained by the previous scan, and Ultrasonic image data is generated based on the fourth data. Furthermore, when data is obtained by the sixth scan, the image generation unit 4 uses the sixth data (data 102b, 106b,...) And the third, fourth, and Ultrasonic image data is generated based on the fifth data.

  Thereafter, when data is obtained by a new scan, the image generation unit 4 obtains the newly obtained data and the data on the scanning line in which no ultrasonic wave was transmitted / received in the scan, and obtained in the previous scan. Ultrasonic image data is generated based on the obtained data, and this process is repeated. Thereby, it is possible to suppress a decrease in the data amount due to the thinning scan, and it is possible to prevent a deterioration in the image quality of the ultrasonic image.

  The control unit 6 includes the above-described alternating scan condition in the control signal and outputs the control signal to the transmission / reception unit 3. The control unit 6 controls each unit of the ultrasonic diagnostic apparatus 1. The ultrasonic probe 2, the transmission / reception unit 3, and the control unit 6 correspond to the “scanning unit” of the present invention.

(Setting the range for performing alternate scanning)
In the above-described example, the alternate scan is executed for all the scan lines, but the ultrasonic diagnostic apparatus 1 according to this embodiment may execute the alternate scan for a part of the scan lines. For example, a region of interest (ROI) may be set, and a normal scan may be performed without thinning scan lines for the inside of the region of interest, and an alternate scan may be performed for the outside of the region of interest. . An example will be described with reference to FIG. FIG. 3 is a schematic diagram for explaining a region of alternating scan with a region of interest (ROI).

  For example, when the operator sets a region of interest (ROI) 120 within a predetermined range 100 using a user interface (not shown) as an input unit, the transmission / reception unit 3 drives the ultrasound probe 2 to An alternating scan is executed for the outer range of 120, and a normal scan is executed for the inner range.

  When the region of interest 120 is set using the user interface, coordinate information of the region of interest 120 is output from the user interface to the control unit 6. Based on the coordinate information, the control unit 6 obtains the range of the scanning line including the region of interest 120 (corresponding to the ultrasonic deflection angle). Then, the control unit 6 includes information indicating the range outside the region of interest 120 (corresponding to the ultrasonic deflection angle) and information indicating the thinning rate of the scanning line in the range outside the control signal. Output to the transceiver 3.

  In the example illustrated in FIG. 3, a normal scan is performed on the scanning lines included in the range 121 including the region of interest 120, and the scanning lines included in the range 122 and the range 123 outside the range 121 are performed. In this case, alternate scanning is executed. The control unit 6 transmits and receives a control signal including information indicating the range 122 and the range 123 (an ultrasonic deflection angle corresponding to the range) and information indicating a thinning rate of the scanning lines in the range 122 and the range 123. Output to part 3. As a result, alternate scanning is executed for the scanning lines included in the range 122 and the range 123, and normal scanning is executed for the range 121 including the region of interest 120.

  For example, for a part that has movement, such as a part such as the heart, and a part that changes rapidly, set a region of interest to perform a normal scan without executing an alternate scan. Alternate scans are performed on peripheral parts that are not of interest. That is, the alternate scan is executed for the portion where the temporal change of the data is small. In this way, the normal scan is performed for the part where the data changes over time, and the alternate scan is executed for the part where the time change is small, thereby improving the frame rate and reducing the image quality of the entire image. Can be prevented.

(Automatic setting of the range for alternate scanning)
Further, a range for performing alternate scanning may be automatically set. The operation unit 8 shown in FIG. 1 automatically determines a range for performing alternate scanning. The calculation unit 8 is based on, for example, data obtained by transmitting and receiving all scanning lines with ultrasonic waves and scanning a predetermined range, and data obtained by similarly scanning all scanning lines after a predetermined time. Then, the temporal change of the data is obtained, and the range where there is no temporal change is determined as the range where the alternate scan is performed.

  Specifically, the calculation unit 8 includes a difference calculation unit 81 and a comparison determination unit 82. The difference calculation unit 81 calculates the difference between data (signal intensity, luminance value, etc.) obtained by transmitting / receiving all scanning lines with ultrasonic waves and scanning a predetermined range, and data obtained after a predetermined time. . The comparison determination unit 82 compares the difference obtained by the difference calculation unit 81 with a preset threshold value. This threshold value is a criterion for determining whether data has changed, and can be set to an arbitrary value by the operator. Then, the comparison / determination unit 82 determines that the range in which the difference is equal to or greater than the threshold is a range in which the data has changed over time, and determines that range as the target range for normal scanning. On the other hand, the comparison / determination unit 82 determines that the range in which the difference is less than the threshold is a range in which the data does not change with time, and determines that range as a target range for alternate scanning.

  For example, the threshold is set so that the difference obtained for a part such as the heart is equal to or greater than the threshold. As a result, a normal scan is executed for a portion with movement (time-varying range), and an alternate scan is executed for a portion with little movement (range with little temporal change).

  The calculation unit 8 outputs coordinate information in a range where the data does not change with time to the control unit 6. Based on the coordinate information, the control unit 6 obtains a scanning line range (corresponding to an ultrasonic deflection angle) including a range in which data does not change with time. The control unit 6 transmits and receives information indicating the range of the scanning line (corresponding to the ultrasonic deflection angle) and information indicating the thinning ratio of the scanning line within the range in the control signal. Output to part 3.

  The transmission / reception unit 3 drives the ultrasonic probe 2 in accordance with a control signal from the control unit 6, and for the scanning line range, performs alternate scanning according to the thinning ratio included in the control signal, and for the other ranges, Instead of alternating scanning, ultrasonic waves are transmitted and received along all scanning lines (normal scanning).

  As a result, the alternate scan is executed for the portion where the temporal change of data is small, and the normal scan is executed for the portion where the data changes temporally. The part where the data does not change in time (the part where the difference is less than the threshold) is the part where the change in the image is small. Therefore, even if ultrasound image data is generated using the data obtained in the previous scan, diagnosis The impact on the Therefore, the frame rate is improved by performing the alternate scan on the portion where the data does not change with time. On the other hand, the portion where the data changes with time (the portion where the difference is greater than or equal to the threshold value) is a portion where there are many changes in the image.

  As described above, the frame rate is improved by performing normal scanning for the portion where the data changes over time and executing alternate scanning for the portion where the data does not change over time. Therefore, it is possible to prevent the deterioration of the image quality of the entire image.

(Decimation rate setting)
The thinning ratio can be arbitrarily set by the operator. That is, the operator can arbitrarily set the number of scanning lines at which ultrasonic waves are transmitted and received. For example, when the operator inputs a thinning ratio using a user interface (not shown), the control unit 6 includes the thinning ratio in a control signal and outputs it to the transmission / reception unit 3. Specifically, when the operator inputs “2” as the number of thinnings using the user interface, the control unit 6 includes the thinning ratio (1/2) in the control signal and outputs it to the transmission / reception unit 3. To do. As a result, a 1/2 scan is executed. When “4” is input as the number of thinnings, the control unit 6 includes the thinning rate (1/4) in the control signal and outputs the control signal to the transmitting / receiving unit 3. Thereby, 1/4 scan is executed.

(Automatic setting of thinning rate)
Further, the thinning ratio when performing alternate scanning may be set automatically. The calculation unit 8 shown in FIG. 1 automatically determines the thinning rate (number of scanning line densities) when performing alternate scanning. The calculation unit 8 is based on, for example, data obtained by transmitting and receiving all scanning lines with ultrasonic waves and scanning a predetermined range, and data obtained by similarly scanning all scanning lines after a predetermined time. Then, the temporal change of the data is obtained, and the thinning ratio is obtained based on the temporal change.

  The difference calculation unit 81 calculates a difference between data (signal intensity, luminance value, etc.) obtained by scanning and transmitting a predetermined range by transmitting and receiving all scanning lines with ultrasonic waves and data obtained by the next scan. To do. The comparison determination unit 82 compares the difference obtained by the difference calculation unit 81 with a preset threshold value. This threshold value serves as a reference for determining whether or not data has changed. Then, the comparison / determination unit 82 determines the thinning-out ratio in the alternate scan depending on how many times the scan in which the difference is less than the threshold value has continued. In other words, the comparison / determination unit 82 determines the thinning-out ratio in the alternate scan based on the number of scans executed until the difference becomes equal to or greater than the threshold value. The thinning rate in this alternate scan corresponds to the “predetermined number in the next scan” of the present invention.

  For example, the difference calculation unit 81 uses the data obtained in the first scan as reference data, and calculates the difference between the data obtained in the second and subsequent scans and the reference data. Then, the comparison / determination unit 82 determines the thinning-out ratio in the alternate scan according to how many times the scan having the difference less than the threshold value has continued. Then, the calculation unit 8 outputs information indicating the determined thinning ratio to the control unit 6.

  For example, if the difference between the first data and the second data is equal to or greater than the threshold value, the comparison / determination unit 82 determines that the data is temporally changed and performs the normal scan. Then, the calculation unit 8 outputs the determination result (normal scan) by the comparison determination unit 82 to the control unit 6. As a result, the transmission / reception unit 3 drives the ultrasonic probe 2 to execute a normal scan.

  On the other hand, if the difference between the first data and the second data is less than the threshold value, and the difference between the first scan data and the third scan data is greater than or equal to the threshold value, the data in the third scan As a result, the comparison / determination unit 82 sets the thinning ratio to “½”. That is, the comparison / determination unit 82 determines to perform scanning by halving the number of scanning lines (1/2 scanning). Then, the calculation unit 8 outputs the determination result (1/2 scan) by the comparison determination unit 82 to the control unit 6. The control unit 6 includes the thinning rate (1/2) in the control signal and outputs the control signal to the transmission / reception unit 3. As a result, the transmission / reception unit 3 drives the ultrasonic probe 2 to execute ½ scan.

  Further, when the difference between the data of the first scan and the data of the fourth scan is equal to or greater than the threshold value for the first time, the comparison determining unit 82 determines that the data has changed in the fourth scan, Is “1/3”. That is, the comparison / determination unit 82 determines to perform scanning by setting the number of scanning lines to 1/3 (1/3 scan). Then, the calculation unit 8 outputs the determination result (1/3 scan) by the comparison determination unit 82 to the control unit 6. The control unit 6 includes the thinning rate (1/3) in the control signal and outputs the control signal to the transmission / reception unit 3. As a result, the transmission / reception unit 3 drives the ultrasonic probe 2 to execute 1/3 scan.

  Further, the thinning ratio may be automatically set for each scanning line. The calculation unit 8 is based on, for example, data obtained by transmitting and receiving all scanning lines with ultrasonic waves and scanning a predetermined range, and data obtained by similarly scanning all scanning lines after a predetermined time. Then, the temporal change of the data is obtained, and the thinning rate for each scanning line is obtained based on the temporal change.

  The difference calculation unit 81 is based on data (signal intensity, luminance value, etc.) obtained by transmitting / receiving all scanning lines with ultrasonic waves and scanning a predetermined range, and data obtained in the next scan, Differences are calculated for the data of the individual scanning lines.

  The comparison / determination unit 82 determines the thinning ratio for each scanning line depending on how many times the scanning in which the difference obtained for each scanning line is less than the threshold value has continued. In other words, the comparison / determination unit 82 determines the thinning ratio for each scanning line based on the number of scans executed until the difference obtained for each scanning line becomes equal to or greater than the threshold. Note that the thinning ratio for each scanning line corresponds to the “predetermined number for each scanning line” of the present invention.

  The difference calculation unit 81 uses, for example, the data of each scanning line obtained in the first scan as reference data, and the individual scanning lines based on the data of each scanning line obtained in the second and subsequent scans. The difference is calculated for the data. Then, the comparison / determination unit 82 determines the thinning ratio for each scanning line depending on how many times the scan whose difference is less than the threshold value has continued.

  For example, the difference calculation unit 81 obtains a difference between data on the scanning line 101 obtained by the first scan and data on the scanning line 101 obtained by the second scan. When the data difference on the scanning line 101 is equal to or greater than the threshold value, the comparison / determination unit 82 determines that the scanning line 101 is to be scanned normally, assuming that the data has a temporal change.

  On the other hand, the difference between the data on the scanning line 101 is less than the threshold and the difference between the data on the scanning line 101 obtained by the first scan and the data on the scanning line 101 obtained by the third scan is the threshold. In the case of the above, assuming that a change has occurred in the data in the third scan, the comparison determination unit 82 sets the thinning ratio for the scanning line 101 to “½”. That is, the comparison / determination unit 82 determines to transmit / receive ultrasonic waves to / from the scanning line 101 at a rate of one out of two scans (1/2 scan for the scanning line 101).

  The difference calculation unit 81 and the comparison determination unit 82 also determine the thinning ratio for each scanning line by comparing the difference with the threshold value for the other scanning lines.

  For example, for the data on the scanning line 102, the difference between the data on the scanning line 102 obtained in the first scan and the data on the scanning line 102 obtained in the fourth scan is equal to or greater than the threshold value. In this case, assuming that a change has occurred in the data in the fourth scan, the comparison / determination unit 82 sets the thinning ratio for the scanning line 102 to “1/3”. That is, the comparison / determination unit 82 determines to transmit / receive ultrasonic waves to / from the scanning line 102 at a rate of one out of three scans (1/3 scan for the scanning line 102).

  Then, the calculation unit 8 outputs the determination result (thinning ratio for each scanning line) by the comparison determination unit 82 to the control unit 6. The control unit 6 includes the thinning rate for each scanning line in the control signal and outputs the control signal to the transmission / reception unit 3. As a result, the transmission / reception unit 3 drives the ultrasonic probe 2 to perform scanning while changing the thinning rate for each scanning line.

  The above calculation results are shown in FIG. FIG. 6 is a schematic diagram for explaining the thinning ratio for each scanning line. For example, 1/2 scan is executed for the scan line 101, 1/3 scan is executed for the scan line 102, 1/4 scan is executed for the scan line 103, and the scan line 104 is executed. ½ scan is executed for the scan line 105 and ½ scan is executed for the scanning line 105. That is, the transmission / reception circuit 3 transmits an ultrasonic beam to the scanning line 101 at a rate of one out of two scans, and to the scanning line 102, one out of three scans. The ultrasonic beam is transmitted at a ratio, and the ultrasonic beam is transmitted to the scanning line 103 at a ratio of one out of four scans.

  Further, when a predetermined range in the depth direction is designated by the operator, the calculation unit 8 may determine a thinning ratio for each scanning line based on data included in the predetermined range.

  Note that the ultrasonic diagnostic apparatus 1 does not have to include the calculation unit 8. That is, the ultrasonic diagnostic apparatus 1 does not have to automatically determine the range for performing the alternate scan, and does not have to automatically determine the thinning-out ratio when performing the alternate scan. Therefore, even an ultrasonic diagnostic apparatus that is not provided with the calculation unit 8 is included in the scope of the ultrasonic diagnostic apparatus of the present invention.

  Moreover, the control part 6 and the calculating part 8 may be comprised with the hardware, and may be comprised with the software. For example, the control unit 6 and the calculation unit 8 are constituted by a CPU, and each function of the control unit 6 and the calculation unit 8 is executed by executing a control program stored in a storage unit (not shown). Also good.

(Operation)
Next, the operation (acquisition method of ultrasonic images) of the ultrasonic diagnostic apparatus according to the embodiment of the present invention will be described with reference to FIG. 4 and FIG. 4 and 5 are flowcharts showing a series of operations by the ultrasonic diagnostic apparatus according to the embodiment of the present invention. First, the flow of processing when performing alternate scanning will be described with reference to FIG. Next, a flow of processing for automatically determining the range for performing alternate scanning or the thinning ratio when performing alternate scanning will be described with reference to FIG.

(Step S01)
The transmission / reception unit 3 drives the ultrasonic probe 2 in accordance with the control signal output from the control unit 6 to execute alternate scanning. Here, as an example, a case where 1/2 scan is executed will be described. When executing 1/2 scan, as shown in the table of FIG. 2A, the transmission / reception unit 3 transmits and receives ultrasonic waves along the odd-numbered scan lines in the first scan, thereby reducing the predetermined range. A predetermined range is scanned by scanning and transmitting / receiving ultrasonic waves along the even-numbered scan lines in the second scan. Thereafter, the transmission / reception unit 3 alternately scans the odd-numbered and even-numbered scanning lines.

(Steps S02 and S03)
When the data output from the transmission / reception unit 3 and before the processing by the digital receiver 41 is stored in the data storage unit 7 (step S02, Yes), the image control unit 44 performs the processing before the processing by the digital receiver 41. Data is stored in the data storage unit 7 (step S03).

  For example, when the first scan is executed and the odd line data (data 101a, 103a, 105a,...) Is obtained, the image control unit 44 detects the first data (odd line data). Thus, data before processing by the digital receiver 41 is stored in the data storage unit 7. When the second scan is executed and even line data (data 102a, 104a, 106a,...) Is obtained, the image control unit 44 detects the second data (even line data). Thus, data before processing by the digital receiver 41 is stored in the data storage unit 7. For the third and subsequent scans, the image control unit 44 causes the data storage unit 7 to store the obtained data and the data before processing by the digital receiver 41.

(Step S04)
Then, the image control unit 44 acquires the data obtained by the previous scan from the data storage unit 7 and outputs the data to the digital receiver 41. For example, when the current scan is the second scan, the image control unit 44 obtains the first data (odd line data) from the data storage unit 7 before being processed by the digital receiver 41. And output to the digital receiver 41.

(Step S05)
The digital receiver 41 outputs the second data (even line data) output from the transmission / reception unit 3 and the first data (odd line data) acquired from the data storage unit 7 by the image control unit 44. Then, predetermined processing such as filter processing and gain processing is performed. When the data before processing by the digital receiver 41 is not stored in the data storage unit 7 (No in step S02), the digital receiver 41 performs predetermined processing on the second data output from the transmission / reception unit 3. Apply.

(Steps S06, S07)
When the data after processing by the digital receiver 41 and before processing by the signal processing unit 42 is stored in the data storage unit 7 (step S06, Yes), the image control unit 44 uses the digital receiver 41. The data after processing and before the processing by the signal processing unit 42 is stored in the data storage unit 7 (step S07).

  For example, when the first scan is executed and the odd line data (data 101a, 103a, 105a,...) Is obtained, the image control unit 44 detects the first data (odd line data). Thus, data processed by the digital receiver 41 is stored in the data storage unit 7. When the second scan is executed and even line data (data 102a, 104a, 106a,...) Is obtained, the image control unit 44 detects the second data (even line data). Thus, data processed by the digital receiver 41 is stored in the data storage unit 7. For the third and subsequent scans, the image control unit 44 causes the data storage unit 7 to store the obtained data and the data processed by the digital receiver 41.

(Step S08)
Then, the image control unit 44 acquires the data obtained by the previous scan from the data storage unit 7 and outputs the data to the signal processing unit 42. For example, when the current scan is the second scan, the image control unit 44 acquires the first data (odd line data) from the data storage unit 7 after being processed by the digital receiver 41. And output to the signal processing unit 42.

(Step S09)
The signal processing unit 42 applies the second data (even-numbered line data) output from the digital receiver 41 and the first data (odd-line data) acquired from the data storage unit 7 by the image control unit 44. Predetermined processing. When the data processed by the digital receiver 41 is not stored in the data storage unit 7 (No in step S06), the signal processing unit 42 performs predetermined processing on the second data output from the digital receiver 41. Apply.

(Steps S10 and S11)
When the data after processing by the signal processing unit 42 and before processing by the DSC 43 is stored in the data storage unit 7 (step S10, Yes), the image control unit 44 performs processing by the signal processing unit 42. The subsequent data and the data before processing by the DSC 43 are stored in the data storage unit 7 (step S11).

  For example, when the first scan is executed and the odd line data (data 101a, 103a, 105a,...) Is obtained, the image control unit 44 detects the first data (odd line data). Thus, data processed by the signal processing unit 42 is stored in the data storage unit 7. When the second scan is executed and even line data (data 102a, 104a, 106a,...) Is obtained, the image control unit 44 detects the second data (even line data). Thus, data processed by the signal processing unit 42 is stored in the data storage unit 7. For the third and subsequent scans, the image control unit 44 causes the data storage unit 7 to store the obtained data and the data processed by the signal processing unit 42.

(Step S12)
Then, the image control unit 44 acquires the data obtained by the previous scan from the data storage unit 7 and outputs it to the DSC 43. For example, when the current scan is the second scan, the image control unit 44 uses the data stored in the data storage unit 7 as the first data (odd line data) and processed by the signal processing unit 42. And output to the DSC 43.

(Step S13)
The DSC 43 outputs the second data (even line data) output from the signal processing unit 43 and the first data (odd line data) acquired from the data storage unit 7 by the image control unit 44. By performing digital scan converter processing, ultrasonic image data is generated, and the ultrasonic image data is output to the display unit 5. When the data processed by the signal processing unit 42 is not stored in the data storage unit 7 (No in step S10), the DSC 43 performs a predetermined process on the second data output from the signal processing unit 43. As a result, ultrasonic image data is generated.

(Step S14)
When ultrasonic image data is output from the image generation unit 4 to the display unit 5, an ultrasonic image based on the ultrasonic image data is displayed on the display unit 5. For example, an ultrasonic image based on the data obtained by the second scan and the data obtained by the first scan is displayed on the display unit 5.

  As described above, it is possible to improve the frame rate by executing alternate scans, and for the scan lines that did not transmit / receive ultrasonic waves, the data amount obtained by using the data obtained in the previous scan is used. Therefore, it is possible to prevent deterioration of the image quality of the ultrasonic image.

  Next, the flow of processing for automatically determining the range for performing alternate scanning and the thinning ratio will be described with reference to FIG.

(Step S20)
First, the operator selects either an alternate scan or a normal scan using a user interface (not shown) (step S20).

(Step S21)
When execution of the alternate scan is selected (step S20, Yes), the control unit 6 outputs a control signal including an instruction to transmit / receive ultrasonic waves to all the scan lines to the transmission / reception unit 3. When the transmission / reception unit 3 receives the control signal, the transmission / reception unit 3 drives the ultrasonic probe 2 to scan the predetermined range by transmitting / receiving ultrasonic waves along all the scanning lines. The image control unit 44 stores the data obtained by this scanning in the data storage unit 7. Further, the image control unit 44 stores the data obtained by the first scan in the data storage unit 7 as reference data.

(Steps S22 and S23)
When the operator selects automatic setting of the alternate scan range or automatic setting of the thinning ratio using a user interface (not shown) (Yes in step S22), the calculation unit 8 selects the alternate scan range or Find the thinning rate. Specifically, the difference calculation unit 81 obtains the data obtained by scanning all the scanning lines with ultrasonic waves and scanning a predetermined range and the previous scan stored in the data storage unit 7. A difference from the obtained data is calculated (step S23). For example, the difference calculation unit 81 calculates a difference between data obtained by a new scan and reference data (first data) stored in the data storage unit 7.

(Step S24)
Then, the comparison determination unit 82 compares the difference obtained by the difference calculation unit 81 with a preset threshold value.

(Steps S25 and S26)
When the comparison determination unit 82 determines that the difference is equal to or greater than the threshold (Yes in step S25), the calculation unit 8 stores the data obtained by the new scan in the data storage unit 7 as reference data (step S25). S26). Thereby, the reference data is updated.

(Step S27)
Then, the comparison / determination unit 82 automatically determines the range of the alternate scan or the thinning-out ratio based on the result of comparing the difference with the threshold value. For example, the comparison / determination unit 82 determines a portion where the difference is less than the threshold as a range where the alternate scan is executed, and determines a portion where the difference is equal to or more than the threshold as a range where the normal scan is executed.

  Further, the comparison / determination unit 82 determines the thinning-out ratio in the alternate scan depending on how many times the scan in which the difference is less than the threshold value has continued. For example, when the difference between the first data (reference data) and the third data is equal to or greater than the threshold value for the first time, the comparison determination unit 82 sets the thinning ratio to “½”. On the other hand, when the difference between the first data (reference data) and the fourth data becomes equal to or greater than the threshold value for the first time, the comparison / determination unit 82 sets the thinning ratio to “1/3”.

(Step S28)
Then, the control unit 6 includes the range for performing the alternate scan obtained by the calculation unit 8 or the thinning ratio in the control signal and outputs it to the transmission / reception unit 3.

(Step S29)
The transmission / reception unit 3 drives the ultrasonic probe 2 in accordance with the control signal output from the control unit 6 to execute alternate scanning. For example, when the range for executing the alternate scan is obtained by the calculation unit 8, the transmission / reception unit 3 performs the alternate scan for the range. When the thinning rate is obtained by the calculation unit 8, the transmission / reception unit 3 performs alternate scanning according to the thinning rate.

  As described above, by providing the calculation unit 8, it is possible to automatically determine the range in which the alternate scan is executed or the thinning ratio.

(Modification)
In the above-described embodiment, the case where the two-dimensional scanning surface is scanned with ultrasonic waves has been described. However, the processing of the above-described embodiment is applied to an ultrasonic diagnostic apparatus that performs so-called parallel simultaneous reception and three-dimensional scanning. Can be applied.

(For parallel simultaneous reception)
When performing parallel simultaneous reception, the transmission / reception unit 3 bundles a predetermined number of scanning lines, sequentially transmits / receives ultrasonic waves every predetermined number of bundles, scans a predetermined range, and transmits / receives ultrasonic waves in the previous scan. A predetermined range is scanned by sequentially transmitting and receiving ultrasonic waves with respect to a bundle of scanning lines that does not exist. Then, the image generation unit 4 generates ultrasonic image data based on the data obtained by the predetermined scan and the data obtained by the scan before the predetermined scan.

  For example, the transmission / reception unit 3 performs four scanning lines as one bundle, and performs alternate scanning with the one bundle as a unit. As in the above embodiment, in the first scan, the transmission / reception unit 3 scans a predetermined range by transmitting / receiving ultrasonic waves along an odd-numbered bundle, and in the second scan, the transmission / reception unit 3 is an even number. A predetermined range is scanned by transmitting and receiving ultrasonic waves along the bundle. Thereby, the transmission / reception part 3 receives the data obtained by transmitting / receiving an ultrasonic wave along four scanning lines as one bundle of data. The image generation unit 4 generates ultrasonic image data based on the odd bundle data and the even bundle data, as in the above embodiment. As described above, even when parallel simultaneous reception is performed, it is possible to perform alternate scanning, and it is possible to improve the frame rate and prevent image quality degradation of the ultrasonic image.

(In the case of an ultrasonic diagnostic apparatus that scans three-dimensionally)
The same processing as in the above embodiment can be performed even in an ultrasonic diagnostic apparatus that includes a two-dimensional ultrasonic probe or a swingable one-dimensional ultrasonic probe and performs three-dimensional scanning. When scanning three-dimensionally, the ultrasound diagnostic apparatus according to this modification generates ultrasound image data by using volume data obtained by scanning before.

  For example, as in the above-described embodiment, in the first scan, the transmission / reception unit 3 scans a volume in a predetermined range by transmitting / receiving ultrasonic waves along the odd-numbered scan lines, and in the second scan, A volume in a predetermined range is scanned by transmitting and receiving ultrasonic waves along the scanning line. And the image generation part 4 produces | generates ultrasonic image data based on the volume data of an even line and the volume data of an odd line similarly to the said embodiment.

  Even when scanning three-dimensionally as described above, by executing alternate scans and generating ultrasonic image data using data obtained in the previous scan, while improving the frame rate, It is possible to prevent deterioration of the image quality of the ultrasonic image.

1 is a block diagram showing a schematic configuration of an ultrasonic diagnostic apparatus according to an embodiment of the present invention. It is a table | surface for demonstrating the scanning line actually scanned and the data used for image generation. It is a schematic diagram for demonstrating the range which performs a region of interest (ROI) and an alternating scan. It is a flowchart which shows a series of operation | movement by the ultrasound diagnosing device which concerns on embodiment of this invention. It is a flowchart which shows a series of operation | movement by the ultrasound diagnosing device which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the thinning-out ratio about each scanning line. It is a schematic diagram which shows the scanning line by which an ultrasonic wave is transmitted / received by alternate scanning.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic diagnostic apparatus 2 Ultrasonic probe 3 Transmission / reception part 4 Image generation part 6 Control part 7 Data storage part 8 Calculation part 44 Image control part 81 Difference calculation part 82 Comparison judgment part

Claims (7)

Scanning means for acquiring received data by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines and scanning a predetermined range;
Storage means for storing the received data;
Image generating means for generating ultrasonic image data based on the received data;
With
The scanning unit scans the predetermined range by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines with respect to a scanning line different from the scanning line scanned to obtain the reception data stored in the storage unit. To get another received data,
The ultrasonic diagnostic apparatus, wherein the image generation means generates ultrasonic image data based on the reception data stored in the storage means and the other reception data.   The scanning means is capable of parallel and simultaneous reception with a predetermined number of scanning lines as a bundle, and sequentially receiving and transmitting ultrasonic waves for every predetermined number of bundles to acquire received data by scanning a predetermined range. The ultrasonic diagnostic apparatus according to claim 1, wherein the apparatus is an ultrasonic diagnostic apparatus. And further has a computing means,
The scanning unit transmits and receives ultrasonic waves along all scanning lines in advance, acquires first reception data by scanning the predetermined range, and transmits ultrasonic waves along the entire scanning lines after a predetermined time. Transmitting and receiving, and scanning the predetermined range to obtain second received data;
The calculation means calculates a difference between the first received data and the second received data, and obtains a range in which the difference is less than a preset threshold in the predetermined range,
2. The scanning unit according to claim 1, wherein, for a range that is less than the threshold value, ultrasonic waves are sequentially transmitted and received every predetermined number of scanning lines, and reception data is acquired by scanning the predetermined range. An ultrasonic diagnostic apparatus according to 1. And further has a computing means,
The scanning unit transmits and receives ultrasonic waves along all scanning lines in advance, acquires first reception data by scanning the predetermined range, and transmits ultrasonic waves along the entire scanning lines after a predetermined time. Transmitting and receiving, and scanning the predetermined range to obtain second received data;
The computing means calculates a difference between the first received data and the second received data, and based on the number of scans executed by the scanning means until the difference is equal to or greater than a preset threshold value. To obtain a predetermined number in the next scan,
In the next scan, the scanning unit sequentially receives and transmits ultrasonic waves every predetermined number of scanning lines obtained by the computing unit, and acquires the received data by scanning the predetermined range. The ultrasonic diagnostic apparatus according to claim 1. And further has a computing means,
The scanning means transmits and receives ultrasonic waves along all scanning lines in advance, acquires first reception data by scanning the predetermined range, and ultrasonic waves along the entire scanning lines after a predetermined time. To obtain the second received data by scanning the predetermined range,
The computing means calculates a difference between the received data for each scanning line based on the first received data and the second received data, and the difference for each scanning line is equal to or greater than a preset threshold value. Until a predetermined number for each scanning line is obtained based on the number of scans performed by the scanning means,
2. The scanning unit according to claim 1, wherein for each scanning line, ultrasonic waves are sequentially transmitted to and received from each scanning line for each predetermined number of scans, and the received data is acquired by scanning the predetermined range. An ultrasonic diagnostic apparatus according to 1. A first scan step of acquiring received data by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines and scanning a predetermined range;
A storage step of storing the received data in a storage means;
A second scan line is obtained by sequentially transmitting and receiving ultrasonic waves every predetermined number of scan lines and scanning the predetermined range for scan lines different from the scan lines scanned in the first scan step. A scanning step;
An image generation step of generating ultrasonic image data based on the reception data stored in the storage means and the reception data obtained in the second scanning step;
An ultrasonic image collecting method, wherein the first scanning step, the storing step, the second scanning step, and the image generating step are repeated. Ultrasonic diagnostic equipment
A first scan function for acquiring received data by sequentially transmitting and receiving ultrasonic waves every predetermined number of scanning lines and scanning a predetermined range;
A storage function for storing the received data in a storage means;
A second scan line is obtained by sequentially transmitting and receiving ultrasonic waves every predetermined number of scan lines and scanning the predetermined range for a scan line different from the scan line scanned by the first scan function. Scan function,
An image generation function for generating ultrasonic image data based on the reception data stored in the storage means and the reception data obtained by the second scan function;
Is a control program for an ultrasonic diagnostic apparatus.

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