WO2006126684A1 - 超音波診断装置及び超音波画像表示方法 - Google Patents
超音波診断装置及び超音波画像表示方法 Download PDFInfo
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- WO2006126684A1 WO2006126684A1 PCT/JP2006/310580 JP2006310580W WO2006126684A1 WO 2006126684 A1 WO2006126684 A1 WO 2006126684A1 JP 2006310580 W JP2006310580 W JP 2006310580W WO 2006126684 A1 WO2006126684 A1 WO 2006126684A1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52023—Details of receivers
- G01S7/52036—Details of receivers using analysis of echo signal for target characterisation
- G01S7/52038—Details of receivers using analysis of echo signal for target characterisation involving non-linear properties of the propagation medium or of the reflective target
- G01S7/52039—Details of receivers using analysis of echo signal for target characterisation involving non-linear properties of the propagation medium or of the reflective target exploiting the non-linear response of a contrast enhancer, e.g. a contrast agent
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/48—Diagnostic techniques
- A61B8/481—Diagnostic techniques involving the use of contrast agent, e.g. microbubbles introduced into the bloodstream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52023—Details of receivers
- G01S7/52036—Details of receivers using analysis of echo signal for target characterisation
- G01S7/52038—Details of receivers using analysis of echo signal for target characterisation involving non-linear properties of the propagation medium or of the reflective target
Definitions
- the present invention relates to an apparatus that captures an ultrasonic image as a diagnostic image of a subject and a display method.
- An ultrasound diagnostic apparatus that captures an ultrasound image as a diagnostic image of a subject sends and receives ultrasound to and from the subject via an ultrasound probe and is output from the ultrasound probe The ultrasound image is reconstructed based on the received signal.
- a so-called harmonic imaging method in which the effect of staining of an ultrasonic contrast agent (hereinafter referred to as a contrast agent) is imaged.
- a contrast agent is administered to the subject and diffused to the diagnostic site.
- harmonics derived from the nonlinearity of the contrast agent are generated.
- vascular shape diagnosis and tissue differentiation are performed (for example, Patent Document 1).
- Patent Document 1 JP-A-11-76231
- An object of the present invention is to provide a clearer image of a signal derived from a contrast medium and a signal derived from a living body.
- an ultrasonic probe that transmits and receives ultrasonic waves to and from a subject, a transmission unit that supplies a drive signal to the ultrasonic probe, and the ultrasonic probe
- a reception means for receiving the reception signal output from the signal processing means, a signal processing means for processing the reception signal output from the reception means, and an ultrasonic image based on the signal output from the signal processing means Image processing means and display means for displaying the ultrasonic image, wherein the signal processing means has means for detecting the signal intensity and time variation of the received signal output from the receiving means for each frequency band.
- the image processing means includes means for discriminating between a signal derived from a contrast agent and a signal derived from a living body in the ultrasonic image based on the signal intensity and the amount of change over time.
- the signal intensity and time variation of the received signal obtained by transmitting and receiving ultrasonic waves to and from the subject are detected for each frequency band, and based on the signal intensity and time variation for each frequency band.
- the signal from the contrast agent and the signal from the living body in the ultrasonic image are discriminated and the ultrasonic image is displayed.
- FIG. 1 is a block diagram showing a configuration of an ultrasonic diagnostic apparatus according to an embodiment to which the present invention is applied.
- FIG. 2 is a diagram for explaining the operation of the frequency band separation means of FIG. 1.
- FIG. 3 is a first diagram for explaining the operation of the multiplication means in FIG. 1.
- FIG. 4 is a second diagram for explaining the operation of the multiplication means of FIG.
- FIG. 5 is a diagram showing a shaded state with respect to an elapsed time after contrast medium administration.
- FIG. 6 is a diagram showing a display range after contrast medium administration.
- FIG. 7 is a diagram for explaining frequency characteristics of the probe shown in FIG. 1.
- FIG. 1 is a block diagram showing the configuration of the ultrasonic diagnostic apparatus of the present embodiment.
- the ultrasonic diagnostic apparatus includes a broadband probe 10 (hereinafter referred to as a probe 10) as an ultrasonic probe for transmitting and receiving ultrasonic waves to and from a subject, a probe, and a probe.
- a broadband probe 10 hereinafter referred to as a probe 10
- Transmitting means 12 for supplying a drive signal to 10 via transmission / reception separating means 11, receiving means 14 for receiving a signal output via probe 10 force transmitting / receiving separation means 11, and output from receiving means 14
- a signal processing means 16 for processing the signal to be processed, an image processing means 18 for reconstructing an ultrasound image based on a received signal output from the signal processing means 16, and an ultrasound image output from the image processing means 18
- Display means 20 for displaying and control means 21 for outputting a control command to each part are provided. For convenience of illustration, a diagram showing the flow of the control command output from the control means 21 is omitted.
- the signal processing means 16 applied to the ultrasonic diagnostic apparatus of the present embodiment includes a plurality of signal intensity detection means 36-l to 36-m for detecting the signal intensity of the received signal for each frequency band,
- the signal strength detection means 36-l to 36-m have temporal change detection means 22-l to 22-m that detect the amount of time change based on the signal intensity output from the signal and the received signal.
- the image processing means 18 is an ultrasonic image based on the signal intensity output from the signal intensity detection means 36-l to 36-m and the temporal change detection means 22-1 to 22-m force.
- highlighting calculation means 24 that emphasizes a signal derived from the contrast medium and a signal derived from a living body.
- the ultrasonic diagnostic apparatus will be described in more detail.
- the probe 10 includes a plurality of transducers that transmit and receive ultrasonic waves to and from the subject.
- a transducer with multiple cMUT Capacitive Micromachined Ultrasonic Transducer: IEEE Trans. Ultrason. Ferroelect. Freq. Contr. Vol45 pp. 678-690 May 1998) that can control the sensitivity of ultrasonic transmission and reception is applied.
- the vibrator may have a composite piezoelectric structure in which a plurality of piezoelectric bodies are arranged, or may have a laminated structure in which piezoelectric bodies having different resonance frequencies are stacked.
- the receiving means 14 includes an amplification amplifier 26 that amplifies the reception signal output from the probe 10 via the transmission / reception separating means 11, and an analog digital signal that converts the reception signal output from the amplification amplifier 26 into a digital signal.
- Converter 28 hereinafter referred to as ADC28
- ADC28 analog digital signal that converts the reception signal output from the amplification amplifier 26 into a digital signal.
- ADC28 analog digital signal that converts the reception signal output from the amplification amplifier 26 into a digital signal.
- phasing and adding means 30 for performing phasing and adding processing to focus the acoustic beam.
- the signal processing means 16 includes a plurality of frequency band separation means 32-l to 32-m for extracting the reception signal output by the reception means 14 for each frequency band, and each frequency band separation means 32-l ⁇ 32-m force Multiplier 34_l ⁇ 34_m that multiplies the output signal by a predetermined coefficient and performs correction according to the ultrasonic propagation time, and each multiplier 34-l ⁇ 34-m Time variation of signals output from multiple signal strength detection means 36_l to 36_m for detecting the signal strength, multiplication means 34-1 to 34-m, and signal strength detection means 36-l to 36-m A plurality of time-change detecting means 22-l to 22-m for detecting the quantity are provided.
- Multiplication coefficient setting means 40 for setting is provided.
- the natural number m corresponds to the number of frequency bands to be extracted.
- Each of the frequency band separation means 32-l to 32-m has a band pass filter (BPF).
- the signal intensity detection means 36-l to 36-m have absolute value calculation means, carrier wave removal processing means, and the like.
- the temporal change detection means 22-l to 22-m have high-pass filters and integration means.
- the frequency band separating means 32-1 is connected to both the signal intensity detecting means 36-1 and the temporal change detecting means 22-1 through a multiplying means 34-1.
- the frequency band separation means 32-1 has been described as a representative example, the other frequency band separation means 32-2 to 32-m are similarly connected to the signal intensity detection means 36 through the multiplication means 34-2 to 34-m. It is connected to -2 to 36_m and time change detection means 22_2 to 22_m.
- the temporal change detection means 22-1 detects the temporal change parameter based on the received signal output from the multiplication means 34-1 and the signal strength input from the signal strength detection means 36-1.
- the time-varying parameters here are a unit time change amount at the ultrasonic repetition interval, a predetermined time change sum amount at the ultrasonic repetition interval, and a predetermined time change sum amount at the frame interval.
- the repetitive ultrasonic repetition interval corresponds to a period (PRF) in which ultrasonic pulses are repeatedly transmitted from the probe 10 to the same scanning line, and may be referred to as a scanning line repetition interval. Les.
- the frame interval corresponds to the interval from the start of transmission of an ultrasonic pulse corresponding to one frame of an ultrasonic image to the start of transmission of an ultrasonic pulse corresponding to the next frame.
- Time change detection means 22-1 was explained as a representative, but other time change detection The same applies to the means 22_2 to 22_m.
- the image processing means 18 uses the signal intensity detected by the signal intensity detecting means 36-l to 36-m and the time change parameter detected by the time change detecting means 22-l to 22-m for each frequency band.
- a plurality of buffer memories 42-l to 42-m for storing are provided.
- the buffer memory 42-1 here passes the signal strength and the temporal change parameter to the highlighting calculation means 24 in accordance with the control command. For example, depending on the desired state, such as the ultrasonic measurement state such as scan conversion and zoom, diagnostic details, and image reconstruction after pause, the signal strength information and time-varying parameters can be measured for continuous frames in real time or pause state. The information for several frames at intervals of several hundred frames is output from the buffer memory 42-1 to the calculation means 24 for highlight display.
- the description has been given on the case of the buffer memory 42-1 the same applies to the other buffer memories 42-2 to 42-m.
- the number of buffer memories 42_l to 42_m installed an example in which only the number corresponding to the number of frequency bands for separating received signals is shown is illustrated, but the number may be increased as appropriate.
- the highlighting calculation means 24 includes a processor having four arithmetic calculation means and comparison means. This processor emphasizes ultrasound contrast agent and biological tissue information against three types of information output from the buffer memory 42-1: signal intensity, unit time variation, and predetermined time variation total amount.
- the control unit 21 outputs a control command to the transmission unit 12, the reception unit 14, the signal processing unit 16, the image processing unit 18, and the like according to, for example, an imaging start command output from the input unit 52.
- the input means 52 includes a keyboard, a mouse, a switch, a knob, and the like. For example, the knob is used for color map switching and hue adjustment of the table setting means 48.
- the switch is used for switching the diagnosis type.
- FIG. 2 is a diagram for explaining the operation of the frequency band separation means 32-l to 32-m.
- 3 and 4 are diagrams for explaining the operation of the multiplication means 34-l to 34-m.
- an ultrasound contrast agent (hereinafter referred to as a contrast agent) is administered to a subject and diffused to a diagnostic site.
- the probe 10 is brought into contact with the body surface of the subject.
- the transmission means 12 In response to the imaging start command, the transmission means 12 generates a drive signal.
- the generated drive signal is supplied to the probe 10 via the transmission / reception separating means 11, an ultrasonic wave is transmitted from the probe 10 to the subject.
- an ultrasonic wave is transmitted from the probe 10 at the lowest frequency (CF0) at the division point (inner point) obtained by dividing the bandwidth of the probe 10 by approximately n.
- one or a plurality of (for example, two) pulse waves are transmitted at an ultrasonic repetition interval (PRF) with respect to the same scanning line.
- PRF ultrasonic repetition interval
- a pulse wave is transmitted for each scan line.
- the number of scanning lines is set corresponding to the size of the field of view of the ultrasonic image and the resolution in the azimuth direction.
- the ultrasonic wave transmitted from the probe 10 is reflected as a reflection echo in the process of propagating in the subject.
- the reflected echo includes harmonics derived from the nonlinearity of the contrast agent and harmonics derived from living tissue.
- Such a reflected echo is received by the probe 10.
- the received reflected echo is converted into an electrical signal and then output as a received signal from the probe 10 to the receiving means 14.
- the received signal input to the receiving means 14 is amplified by the amplification amplifier 26.
- the amplified received signal is converted into a digital signal by the ADC 28.
- the digitized received signal is subjected to phasing addition by the phasing addition means 30 and then output from the reception means 14 to the signal processing means 16.
- the received signal input to the signal processing means 16 is input to each of the frequency band separation means 32-l to 32-m, where the received signals are separated and extracted for each of m types of set frequency bands.
- Signal For example, as shown in FIG. 2, the signal corresponding to the fundamental wave (F0) included in the received signal is extracted by the frequency band separation means 32-1.
- the second harmonic contained in the received signal (the signal corresponding to 2F0 is extracted by the frequency band separating means 32-2.
- the third harmonic contained in the received signal (the signal corresponding to 3F0 is the frequency band separating means 32).
- this is not limited to this form, and intermediate frequencies (for example, Sub Harmonic, 1.5 Harmonic, 3rd Harmonic) may be emitted. .
- the signal strengths of the signals output from the frequency band separation means 32-l to 32-m are corrected by the multiplication means 34-l to 34-m.
- the reception signal output from the frequency band separation means 32-1 is input to the multiplication means 34-1 where the signal strength is corrected by multiplying by a predetermined multiplication coefficient.
- the reception signal output from the frequency band separation unit 32-2 is corrected by the multiplication unit 34-2
- the reception signal output from the frequency band separation unit 32-3 is corrected by the multiplication unit 34-3.
- the multiplication coefficient setting means 40 is used for each frequency band, that is, for each of the multiplication means 34-1 to 34 -m with respect to the ultrasonic propagation time.
- Variable control More specifically, for the received signal (F0), the multiplication coefficient is increased almost in proportion to the increase of the ultrasonic propagation time.
- the multiplication coefficient is gradually increased until the predetermined ultrasonic propagation time, and when the time is exceeded, the multiplication coefficient is gradually decreased.
- the multiplication coefficient is basically changed in the same way as for the received signal (2F0), but the ultrasonic propagation time at which the multiplication coefficient is maximum is greater than that for the received signal (2F0). small.
- time-varying parameters are detected for each of the m set frequency bands.
- the time-varying parameters are a unit time change amount at the ultrasonic repetition interval, a predetermined time change sum amount at the ultrasonic repetition interval, and a predetermined time change sum amount at the frame interval.
- the signal strength is I (t)
- the time-varying parameters of each frequency band are obtained as shown in Table 1 by the time-varying detection means 22_l to 22_m.
- the obtained time-varying parameters are stored in the buffer memories 42-l to 42-m for each of m frequency bands.
- the amount of change per unit time increases when the signal strength is large and abrupt changes, but decreases when the signal strength is small and the change is slow.
- the predetermined time change total amount is the sum of the unit time change amounts in the predetermined time, and increases when the unit time change of the predetermined time is large and continues, but decreases when the unit time change is small and single. More specifically, for contrast agents, static biological tissues (for example, kidneys), dynamic biological tissues (for example, heart and blood vessels), and blood cells, the ultrasonic frequency band and temporal variation are as shown in Table 2. There are features.
- the contrast agent is characterized mainly by the fact that the signal intensity increases due to the large difference in acoustic impedance from the living body, and because the volume change due to ultrasonic irradiation vibrates nonlinearly.
- Waves, second harmonics, and third harmonics are large, and because they are relatively easy to move, both the unit time variation and the predetermined time variation total amount are large.
- the feature of biological tissue is that the third harmonic is relatively small because the volume does not change compared to the contrast agent.
- the characteristic of static biological tissue is that both the unit time change amount and the predetermined time change amount are small because the force movement that increases the signal intensity is small.
- Dynamic biological tissue is characterized by high signal intensity but ultrasound
- the amount of change in the unit time of the repetition interval is relatively small, but the total amount of change in the predetermined time of the frame interval is large.
- the characteristic of blood cells is that the signal intensity is smaller than that of living tissue, but the amount of change per unit time and the total amount of change over time is larger than that of static living tissue because it moves freely within the body.
- the signal strength and time-varying parameters held in the buffer memories 42-l to 42-m are read by the emphasis display computing means 24.
- scan conversion, zoom, or ultrasonic measurement state is read according to a desired state such as image reconstruction after a pause.
- the highlighting calculation means 24 determines whether the information of each pixel of the ultrasonic image is derived from a living body or a contrast agent.
- the saturation, brightness, and hue are assigned to the information of each pixel of the ultrasonic image by the color encoding table 44.
- an ultrasonic image is formed by the frame synthesizing means 46.
- the constructed ultrasonic image is displayed on the display means 20.
- Equation (1) is given as an arithmetic expression for emphasizing the contrast agent-derived signal and the living body-derived signal by the highlight display computing means 24.
- A, B, and C are weighting factors that are multiplied by each signal.
- the contrast agent has a resonance frequency based on the result of hardness and inertia according to the original radius of the contrast agent in addition to the nonlinear phenomenon in which ultrasonic waves propagate through the elastic body (for example, IEEE Ultra sonics Symposium 1996 P1451). For this reason, a signal derived from a contrast medium has a certain level of signal strength even for a relatively high-order harmonic, whereas a signal derived from a living body has a small signal strength for a relatively high-order harmonic.
- formula (1) is calculated with the weighting factor as “C l A ⁇ B ⁇ O”.
- Equation (1) is calculated by setting the weight coefficient to “A 0 ⁇ 5 1 ⁇ 0 ⁇ 0.5 1 ⁇ 0 C 0 1.0”.
- the sum of ABC is set to a constant value (for example, “1”).
- formula (1) is calculated with the weighting factor set to “1/3”.
- the calculation result (sum) of Expression (1) is used to determine a contrast medium-derived signal and a living body-derived signal in combination with the temporal change parameter in the highlighting calculation means 24.
- the calculation means 24 for highlighting for example, the signal intensity of the signal Sig (FO), the unit time change amount, and the predetermined time change total amount of each of the three types of information, A total of nine signals are generated by executing the origin enhancement calculation, the contrast agent-derived enhancement calculation using the contrast agent-derived signal enhancement coefficient, and the non-enhancement calculation based on Equation (1). Further, the signal intensity ratio between the living body and the contrast medium is calculated. Such arithmetic processing is executed in units of image pixels.
- the color encoding table 44 assigns saturation, lightness, or hue in units of image pixels. For example, in the case of retinal time cardiac diagnosis, a signal that has not been subjected to enhancement processing of the unit time variation at the ultrasonic repetition interval is used for saturation, and the contrast agent is determined based on the signal strength ratio of the living body and the contrast agent relative to the signal intensity. Red is used for emphasis and blue is used for living tissue. As a result, the image derived from the contrast medium is shaded bright red. Images derived from static biological tissue are dyed light dim blue. The image derived from the dynamic living tissue is shaded light blue. Such color mapping is also effective when diagnosing a blood vessel shape such as a tumor as a real-time diagnosis of the vascular phase.
- the signal obtained by simply emphasizing the origin of the contrast agent with respect to the signal intensity is red, and the origin of the living body is emphasized.
- the area stained with the contrast agent may be emphasized.
- By displaying an ultrasonic image to which saturation or the like is assigned from the color encoding table 44 it is easy to distinguish between an image derived from a cosmetic agent and an image derived from a living body.
- FIG. 5 is an example of a tissue differential diagnosis, and is a diagram showing a dyed state with respect to an elapsed time after administration of a contrast medium.
- the horizontal axis in Fig. 5 represents the elapsed time after contrast medium administration, and the vertical axis represents the signal intensity.
- blood vessels are shaded in the early phase, and the rise and fall of the shade are steep.
- the staining starts from a time later than the blood vessels in the early phase, the rising of the staining is steep, and the falling is slow.
- the liver begins to shade from the middle phase, and the rise and fall of the shadow are both slow.
- a tumor with many new blood vessels begins to stain early, and the fall of the shadow is slow. Tumors with necrosis do not stain. Such a shadowing action enables differential diagnosis of pathological tissues.
- Table 3 shows the elapsed time after injection of contrast medium in the liver and the contrast medium staining status of intravascular, hepatocyte, and liver cancer.
- the contrast medium injected into the living body gradually spreads from the inside of the blood vessel to the whole body and is eventually discharged out of the body by the action of the lungs and kidneys. What is engulfed by phagocytic cells stays relatively long.
- the contrast medium is divided into early, middle, and late periods according to the elapsed time from the injection start time, for example, the contrast medium concentration in the blood vessel increases rapidly from the injection start time, and then gradually increases after a certain time.
- the signal derived from the blood vessel becomes large early in the unit time variation, the predetermined time variation sum, and the signal strength sum.
- the contrast medium concentration in the blood vessels decreases, so the unit time variation, the predetermined time variation sum, and the signal intensity sum are small.
- the signal derived from hepatocytes has a small unit time variation, a predetermined time variation sum, and a signal strength sum in an early stage. It gradually increases in the middle period and becomes the maximum in the latter period.
- the concentration of contrast medium in liver cancer increases rapidly from the injection start time in the early stage due to the abundance of new blood vessels, and decreases rapidly after a certain time. To do. Therefore, the signal derived from liver cancer has a large amount of unit time variation, predetermined time variation sum, and signal intensity sum in an early stage.
- the unit time variation amount, the predetermined time variation sum amount, and the signal intensity sum amount have certain values, unlike in the blood vessel in the middle period.
- the amount of change in unit time, the total amount of change over time, and the total amount of signal intensity are small in the late period.
- the elapsed time after contrast medium injection differs from the contrast medium staining status of intravascular, hepatocyte, and liver cancer.
- liver tissue differentiation has been described, it can also be applied to tissue differentiation of other organs.
- the staining time differs between a blood vessel that flows directly from the heart to a living tissue and a portal vein that passes through the small intestine.
- necrotic cells may not be shaded on areas where blood flow is not flowing, such as abscesses.
- a coefficient for emphasizing a contrast agent is set, and saturation is set for a unit time change amount at an ultrasonic repetition interval, and a time change at a frame interval is set.
- the contrast state of the contrast medium can be determined. For example, it can be determined whether or not the rising and falling of the shadow are steep. It can also be determined whether or not the dyeing continues.
- it is possible to determine whether the early phase, the mid-term phase, or the late phase is shaded or not shaded. Tissue characteristics can be differentiated based on such contrast agent staining state.
- the color mapping in this example can be applied to still images, videos that have been saved, or abdominal diagnosis on the fly.
- the liver is colored red in the early phase, and if it is colored green in the middle phase, the colored region is the liver. It turns out that it is cancer. Especially in the first half of the middle phase, only liver cancer is colored in the liver, so just observing that phase can reveal the location of liver cancer.
- the frame synthesis means 46 superimposes the image created from the signal derived from the living body and the image colored only for liver cancer. By creating an ultrasound image in this way, it is possible to determine which part of the living body has liver cancer.
- the contrast agent-derived signal is displayed in the lower part of the bar 100 display means 20 for selectively displaying, and the contrast agent-derived signal is selectively displayed using the input means 52.
- Time phase is divided into 100 early phase, mid-term phase and long-term phase. These boundaries are shown with dashed lines.
- the time bar 100 is displayed with a start point 101 indicating start and an end point 102 indicating end.
- the input means 52 start point 101 end point 102 is generated, and the operated information is transmitted to the control unit 21, and the control unit 21 controls the color encoding table 44. Coloring is performed using a signal derived from the contrast medium between the color encoding table 44, the start point 101 and the end point 102.
- Coloring starts from the time phase at which the start point 101 is displayed, and coloring ends at the time phase at which the end point 102 is displayed.
- the start point 101 and the end point 102 are set in the first half of the middle phase so that only the colored area in the first half of the middle phase is displayed, only the liver cancer site can be displayed. it can. If only hepatocytes are to be observed, a start point 101 and an end point 102 are set in the latter half of the late phase.
- the time change amount of the reception signal output from the reception unit 14 is extracted for each frequency band, and the intensity and time change amount of each signal are detected.
- the contrast medium-derived signal and the living body-derived signal are highlighted and displayed in color based on the determination result, so that the contrast medium-derived signal and the living body-derived signal are each clearly imaged. Can do.
- a black and white tomographic image may be captured before administering the contrast agent to the subject, and the captured black and white tomographic image may be displayed side by side or superimposed on the color ultrasound image of the present embodiment.
- the black and white tomographic image becomes a background image with respect to the color ultrasonic image, so that it is easy to proceed with the procedure while viewing the organ to be diagnosed on the image.
- FIG. 7A is a diagram showing the frequency band characteristics of the probe 10 of the present embodiment by dotted lines.
- FIG. 7B is a diagram showing a frequency band of ultrasonic waves transmitted from the probe 10.
- FIG. 7C is a diagram showing the frequency band of the ultrasonic wave received by the probe 10.
- the horizontal axis represents frequency
- the vertical axis represents signal strength.
- the frequency band is low range F0, center 2F0, high range 3F0.
- the transmission frequency is a low frequency of 2 MHz, for example, there is a method of receiving harmonics within the frequency band with 4 MHz for the second harmonic and 6 MHz for the third harmonic, but the transmission frequency is outside the frequency band. Therefore, the efficiency may deteriorate.
- the probe 10 of the present embodiment has a specific band power of 00% or more, for example, when the center frequency is 5 MHz, the frequency band is changed from the low frequency 2.5 MHz to the high frequency 7.5 MHz.
- the transmission frequency (F0) of the probe 10 is 2.5 MHz as shown in FIG. 7B
- the second harmonic (2F0) is 5 MHz
- the third harmonic (3F0) is Harmonics can be received within the frequency band at 7.5 MHz.
- signals in the fundamental band derived from a contrast medium or a living body and high frequency bands derived from a contrast medium or derived from a living body can be received with high sensitivity.
- signals in the fundamental band derived from a contrast medium or a living body and high frequency bands derived from a contrast medium or derived from a living body can be received with high sensitivity.
- even relatively high-order harmonics can be received with high sensitivity, so that signals derived from contrast agents or organisms can be imaged more clearly.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US11/915,642 US8055036B2 (en) | 2005-05-27 | 2006-05-26 | Ultrasonic diagnostic apparatus and ultrasonic image display method |
CN2006800148267A CN101170947B (zh) | 2005-05-27 | 2006-05-26 | 超声波诊断装置及超声波图像显示方法 |
EP06746909A EP1884195A4 (en) | 2005-05-27 | 2006-05-26 | ULTRASONIC UNIT AND METHOD FOR DISPLAYING AN ULTRASOUND IMAGE |
JP2007517923A JP4772788B2 (ja) | 2005-05-27 | 2006-05-26 | 超音波診断装置及び超音波画像表示方法 |
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PCT/JP2006/310580 WO2006126684A1 (ja) | 2005-05-27 | 2006-05-26 | 超音波診断装置及び超音波画像表示方法 |
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US (1) | US8055036B2 (ja) |
EP (1) | EP1884195A4 (ja) |
JP (1) | JP4772788B2 (ja) |
CN (1) | CN101170947B (ja) |
WO (1) | WO2006126684A1 (ja) |
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JP2009136626A (ja) * | 2007-12-10 | 2009-06-25 | Aloka Co Ltd | 超音波診断装置 |
JP2009279033A (ja) * | 2008-05-19 | 2009-12-03 | Konica Minolta Medical & Graphic Inc | 超音波診断装置 |
US20110230766A1 (en) * | 2008-10-09 | 2011-09-22 | Signostics Limited | Ultrasound imaging modality improvement |
WO2012020758A1 (ja) * | 2010-08-11 | 2012-02-16 | 株式会社東芝 | 医用画像診断装置、画像処理装置及び方法 |
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JP2016059582A (ja) * | 2014-09-17 | 2016-04-25 | 株式会社ジェイマックシステム | 診断支援装置、診断支援方法および診断支援プログラム |
JP2016087161A (ja) * | 2014-11-06 | 2016-05-23 | 株式会社ジェイマックシステム | 診断支援装置、診断支援方法および診断支援プログラム |
JP2017108978A (ja) * | 2015-12-17 | 2017-06-22 | オリンパス株式会社 | 超音波観測装置、超音波観測装置の作動方法および超音波観測装置の作動プログラム |
Also Published As
Publication number | Publication date |
---|---|
US8055036B2 (en) | 2011-11-08 |
EP1884195A4 (en) | 2011-03-30 |
JP4772788B2 (ja) | 2011-09-14 |
CN101170947A (zh) | 2008-04-30 |
EP1884195A1 (en) | 2008-02-06 |
US20090299182A1 (en) | 2009-12-03 |
JPWO2006126684A1 (ja) | 2008-12-25 |
CN101170947B (zh) | 2010-11-24 |
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