WO2005034759A1 - 管腔壁組織性状評価装置、画像処理装置、画像処理方法、及びコンピュータプログラム - Google Patents
管腔壁組織性状評価装置、画像処理装置、画像処理方法、及びコンピュータプログラム Download PDFInfo
- Publication number
- WO2005034759A1 WO2005034759A1 PCT/JP2004/015023 JP2004015023W WO2005034759A1 WO 2005034759 A1 WO2005034759 A1 WO 2005034759A1 JP 2004015023 W JP2004015023 W JP 2004015023W WO 2005034759 A1 WO2005034759 A1 WO 2005034759A1
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- area
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Classifications
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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
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/02007—Evaluating blood vessel condition, e.g. elasticity, compliance
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0012—Biomedical image inspection
Definitions
- Lumen wall tissue property evaluation device image processing device, image processing method, and computer program
- the present invention relates to an apparatus and a method for automatically extracting data relating to an arteriosclerotic lesion (plaque) on a blood vessel wall, for example, an arterial wall from digital image data, for example, ultrasound image data, and automatically analyzing the tissue properties thereof, And computer programs.
- a blood vessel wall for example, an arterial wall
- digital image data for example, ultrasound image data
- plaque lesions can be diagnosed by measuring the properties of the intima or media.
- the intima-media composite thickness of the carotid artery is determined from the "trajectory" of the inner wall of the adventitia and the inner wall of the intima.
- Patent Document 1 Japanese Patent No. 2889568
- An object of the present invention is to carry out computer processing of digital image data on a vascular plaque lesion acquired by an ultrasonic diagnostic device or the like, thereby performing a quantitative evaluation of tissue characteristics of the plaque lesion.
- Luminal wall tissue property evaluation device according to the present invention
- An image processing apparatus comprising a computer for reproducing the image of the detected site
- the image processing device includes
- a second outer peripheral locus is formed at a position where the above-mentioned lumen outer peripheral locus is shifted toward the center of the tube by a slight predetermined distance, and the above-described inner lumen locus is shifted slightly outside the tube by a predetermined distance.
- a fifth area is set immediately outside the lumen on the outer circumference of the lumen
- the relative brightness of the third region with respect to the fourth and fifth regions is determined. It is characterized in that one or more types of predetermined indices are calculated.
- Quantitative automatic evaluation can be performed on the tissue properties of a plaque lesion related to a blood vessel, for example, a carotid artery.
- FIG. 1 is a schematic flowchart of a calculation relating to a quantitative automatic evaluation of a tissue property of a plaque lesion portion.
- FIG. 2 is a schematic diagram showing a relationship between a probe (ultrasonic transceiver) and a carotid artery to be measured.
- FIG. 3 is a schematic display example of ultrasonic digital data relating to an artery on a personal computer (image processing device) display.
- FIG. 4 is a further schematic enlarged view of a plaque lesion image including an auxiliary line for calculation.
- FIG. 5 is a block diagram showing the overall configuration of an arterial wall lesion tissue automatic evaluation device according to the present invention, including a system for determining an intima trajectory and an adventitia trajectory of a carotid artery according to the prior art.
- FIG. 6 is a part of a cross-sectional view showing a configuration of an artery.
- FIG. 7 is a plane on which a relative luminance standard deviation and a relative luminance average value are plotted.
- FIG. 5 is a schematic diagram of a measurement system 2 for measuring the intima-media thickness of the carotid artery intima-media (hereinafter referred to as IMT) disclosed in Japanese Patent No. 2889568. It is a block diagram.
- the small linear type ultrasonic device 4 of the present system 2 has the size of a personal computer. The higher the frequency of the ultrasonic probe, the higher the resolution of the distance, but if it is too high, it will not be able to reach deep because the attenuation will be large.
- the distance resolution can be measured to almost 0.1 mm if the sound speed is 1500 mZ seconds.
- a digital output board 10 photo-isolated by a photo isolator 8 is attached to the ultrasonic device 4. With this board 10, an image read as digital data from the ultrasonic transceiver (probe) 6 can be output as digital data. Further, since the ultrasonic device 4 and a personal computer (image processing device) 12 described later are photo-isolated, safety for medical use is ensured.
- the personal computer (image processing apparatus) 12 is a general-purpose personal computer, and has a memory with sufficient capacity and capacity for performing image processing. Also, One personal computer (image processing apparatus) 12 is provided with a hard disk, on which the IMT measurement software, database software, printout software, digital image capture software, and the like are installed. Software for quantitative automatic evaluation of tissue characteristics of plaque lesions according to the present invention, which will be described later, is also installed.
- the personal computer (image processing apparatus) 12 is provided with a PCI bus, and a digital input board 14 is mounted on the PCI bus.
- the digital input board 14 is connected to a digital output board 10 of the ultrasonic apparatus 4 via a connection cable 16 and a photo isolator 8, and inputs data output from the digital output board 10.
- This data is stored in the memory unit of the personal computer (image processing apparatus) 12.
- the printer 18 may be connected to the personal computer (image processing device) 12. With this configuration, the measurement result can be printed.
- the artery is divided into three layers from the inside, the intima, the media, and the adventitia, and it has already been described that the lesion causes hypertrophy of the intima or the media.
- the measurement target is the carotid artery.
- the carotid artery 2 to 3 cm below the skin, has a diameter of about 5 mm, and is in a position where an ultrasonic image can be easily captured.
- FIG. 2 shows an example of such a probe (ultrasonic transmitter / receiver) 6 and an ultrasonic image.
- a portion having strong reflection is represented with high brightness on the ultrasonic image. Therefore, by observing the change in luminance in a direction that penetrates an arbitrary tube diameter of the blood vessel, the inner wall position of the intima and the inner wall position of the adventitia related to the tube diameter can be determined. Can be measured.
- Patent No. 2889568 first, a still image of a longitudinal section of the carotid artery is read as digital data by the ultrasonic device 4, and the digital data is taken into the personal computer (image processing device) 12 as it is. Then, the peak value of the luminance value is obtained by numerical analysis to measure the luminance change. Further, based on the measurement result of the luminance change, the wall positions of the intima and the adventitia in the radial direction of the blood vessel are determined at a plurality of positions in the longitudinal direction of the blood vessel.
- the wall position of the intima and adventitia in the radial direction of the blood vessel determined at a plurality of positions in the longitudinal direction of the blood vessel is used to determine the position of the blood vessel in the longitudinal direction.
- the thickness of the intima and media can be measured accurately in a direction perpendicular to the wall of the blood vessel. Has been established.
- the regression curve is used, for example, it is easy to obtain the "trajectory" of the inner wall of the adventitia and the inner wall of the intima.
- the "trajectory" data of the inner wall of the adventitia and the inner wall of the intima thus obtained is used.
- the “trajectory” data of the inner wall of the adventitia and the inner wall of the intima in the ultrasonic image data obtained by the carotid artery vascular membrane pressure measuring device is used to perform blur. This shows that quantitative automatic evaluation of the tissue properties of the lesion is performed.
- digital image data is not limited to ultrasonic image data, but may be magnetic resonance image (MRI) data or CT scanner data!
- FIG. 3 is a display example of a display of a personal computer (image processing apparatus) 12. On the display screen, a longitudinal section of the blood vessel including the plaque lesion 20 is displayed. Of course, digital images obtained by transmitting ultrasound often have unclear areas, However, in FIG. 3, it is represented by a considerably diagrammatic drawing for easy understanding.
- the area of the plaque lesion part 20 is fixed.
- the operator of the personal computer (image processing apparatus) 12 uses a mouse or the like to mark the template 22 displayed on the display screen with a mouse so that the plaque lesion 20 is completely covered as shown in FIG. Move and perform a click operation to specify the measurement area.
- the measurement region, that is, the template 22 is, for example, a region having a length (actual size) of 20 mm along the longitudinal direction of the blood vessel.
- the calculation relating to the quantitative automatic evaluation of the tissue properties of the plaque lesion 20 can be performed by a computer program installed in the personal computer (image processing device) 12. Automatically.
- FIG. 4 is a further enlarged view of an image of the plaque lesion 20.
- FIG. 1 is a schematic flowchart of a calculation related to a quantitative automatic evaluation of a tissue property of a plaque lesion 20. The quantitative automatic evaluation of the tissue properties of the plaque lesion 20 will be described with reference to FIGS.
- Step 1 Lines (Line 6 and Line 7) substantially perpendicular to the artery wall at both ends of the measurement area are determined. Further, the trajectory of the inner wall of the intima (hereinafter, referred to as an intima trajectory) “Linel” and the trajectory of the inner wall of the epicardium (hereinafter, referred to as an adventitia trajectory) “Line4” in the measurement region are determined. Determination of the intima trajectory (Lineel) and the adventitia trajectory (Line 4) can be performed by the above-described conventional technique.
- a plaque inner line (Line 2) is set 0.1 mm (in actual size) from the intima trajectory (Line 1) to the adventitia. That is, the plaque inner line (Line2) is a line obtained by shifting the intima locus (Linel) along the both ends of the measurement region (Line6, Line7) by 0.1 mm (in actual size) in parallel to the adventitia.
- Step 3 In the same manner as in Step 2 above, a plaque outer line (Line 3) is set 0.2 mm (in actual size) from the outer trajectory (Line 4) to the intimal side.
- Step 4 A region surrounded by both ends of the measurement region (Line 6, Line 7), a plaque inner line (Line 2), and a plaque outer line (Line 3) is referred to as “plaque region P”.
- the luminance average (IPm) and the luminance standard deviation (IPsd) of the plaque region P are calculated using the digital data of all the pixels included in the plaque region P.
- Step 5 Intima locus (Linel) 2 mm (in actual size) A reference line (LineO) is set, and a second low-brightness reference line (LineO ') is set 0.2 mm (in actual size) from the first low-brightness reference line (LineO) to the lumen side of the blood vessel.
- a region surrounded by both ends of the measurement region (Line6, Line7), the first low-brightness reference line (LineO), and the second low-brightness reference line (LineO ') is defined as a low-brightness reference band V.
- the brightness decreases in the lumen of the blood vessel toward the center.
- the luminance of the low luminance reference band V is a low luminance reference for the luminance of the plaque region P, as the wording implies.
- the low-luminance reference band mode (IVmax) of the low-luminance reference band V is calculated.
- Step 6 An outer film luminance reference line (Line 4 ′) is set 0.2 mm outside (in actual size) from the outer film locus (Line 4).
- the area surrounded by both end lines (Line6, Line7), adventitia locus (Line4), and adventitia luminance reference line (Line4 ') is defined as a high luminance reference band T.
- the luminance of the high luminance reference band T is a high luminance reference for the luminance of the plaque region P.
- the high-brightness reference band mode value (ITmax) and the high-brightness reference band standard deviation (ITsd) of the high-brightness reference band T are calculated.
- Step 7 The following numerical values for determining the tissue properties of the plaque are calculated.
- % IPm is a numerical value indicating where the luminance average IPm of the plaque region P is located between the high luminance reference band mode (ITmax) and the low luminance reference band mode (IVmax). That is, the relative luminance average value is obtained.
- % IPsd is a relative luminance standard deviation value.
- the horizontal axis represents the relative luminance standard deviation
- the vertical axis represents the relative luminance average value
- RM'index will be described. It is generally known that as the plaque lesion progresses, the brightness of the adventitia, that is, the high-brightness reference band T, decreases (decreases). At this time, the high-luminance reference band mode value (ITmax) decreases and the high-luminance reference band standard deviation (ITsd) increases slightly. . Therefore, “RM'index” is one of the indexes indicating the progress of the plaque lesion, and the numerical value increases as the lesion progresses.
- Step 8 Plaques can be classified using “% IPm” and “% IPsd” as shown in the following table (Table 1).
- the above classification is one example.
- “uniform” and “non-uniform” of the relative luminance standard deviation “% IPsd” can be used as an indication of the uniformity of the contents (tissue) of the plaque.
- the threshold for separating “uniform” and “uneven” is, for example, “23”.
- the plaque is in the "high luminance” category of the relative luminance average "% IPm", it can be used as an indicator that calcification of plaque is in progress.
- the relative luminance average is in the category of “medium luminance” of “% IPmj”
- plaque fibrosis mainly progresses, and it can be used as a measure of ruling.
- the plaque is in the “low brightness” category of the relative brightness average “% IPm”
- the threshold for separating “medium luminance” and “low luminance” is, for example, “57”.
- the personal computer (image processing apparatus) 12 automatically performs the processing based on a computer program installed in the personal computer (image processing apparatus) 12.
- the plane in FIG. 7 (1) is roughly divided as shown in FIG. 7 (2). Multiple dotted lines in FIG. 7 (2) indicate threshold lines (graphs) that define the classification. If the threshold value changes, the classification in Fig. 7 (2) also changes. That is, the threshold value is appropriately changed for convenience in classification. If the plane (% IPsd '% IPm plane) in Fig. 7 (1) is used as a reference, Fig. 7 (3) The following classification can also be assumed.
- the classification in Table 1 is highly compatible with the general classification of plaque lesions.
- the purpose of classifying plaque lesions is to plan for differences in incidence, differences in treatment and treatment, and differences in prognosis. Therefore, if Table 1 is used as appropriate while adjusting the threshold value, and if the plane in FIG. 7 is used as appropriate while adjusting the dividing lines, the difference in the incidence rate, the difference in treatment and treatment, and the difference in the prognosis will differ. Etc. can be properly grasped.
Abstract
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JP2005514628A JPWO2005034759A1 (ja) | 2003-10-09 | 2004-10-12 | 管腔壁組織性状評価装置、画像処理装置、画像処理方法、及びコンピュータプログラム |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006122686A (ja) | 2004-10-28 | 2006-05-18 | Sonosite Inc | 超音波血管測定装置および方法 |
WO2009034729A1 (ja) * | 2007-09-14 | 2009-03-19 | Gifu University | 画像処理装置、画像処理プログラム、記憶媒体及び超音波診断装置 |
CN104814754A (zh) * | 2015-04-01 | 2015-08-05 | 王有彬 | 正电子发射神经断层扫描装置 |
KR20170021558A (ko) * | 2015-08-18 | 2017-02-28 | 삼성메디슨 주식회사 | 초음파 진단 장치 및 그 동작방법 |
Citations (4)
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JP2889568B1 (ja) * | 1998-05-18 | 1999-05-10 | 正男 伊藤 | 血管膜厚測定装置及び動脈硬化診断装置 |
JPH11342132A (ja) * | 1998-06-03 | 1999-12-14 | Ge Yokogawa Medical Systems Ltd | 血管計測方法および装置並びに医用画像装置 |
JP2000271117A (ja) * | 1999-03-25 | 2000-10-03 | Aloka Co Ltd | 超音波血管計測装置 |
JP2001509043A (ja) * | 1996-11-29 | 2001-07-10 | インペリアル カレッジ オブ サイエンス,テクノロジー アンド メディスン | 超音波走査 |
-
2004
- 2004-10-12 WO PCT/JP2004/015023 patent/WO2005034759A1/ja active Application Filing
- 2004-10-12 JP JP2005514628A patent/JPWO2005034759A1/ja not_active Ceased
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JP2001509043A (ja) * | 1996-11-29 | 2001-07-10 | インペリアル カレッジ オブ サイエンス,テクノロジー アンド メディスン | 超音波走査 |
JP2889568B1 (ja) * | 1998-05-18 | 1999-05-10 | 正男 伊藤 | 血管膜厚測定装置及び動脈硬化診断装置 |
JPH11342132A (ja) * | 1998-06-03 | 1999-12-14 | Ge Yokogawa Medical Systems Ltd | 血管計測方法および装置並びに医用画像装置 |
JP2000271117A (ja) * | 1999-03-25 | 2000-10-03 | Aloka Co Ltd | 超音波血管計測装置 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006122686A (ja) | 2004-10-28 | 2006-05-18 | Sonosite Inc | 超音波血管測定装置および方法 |
WO2009034729A1 (ja) * | 2007-09-14 | 2009-03-19 | Gifu University | 画像処理装置、画像処理プログラム、記憶媒体及び超音波診断装置 |
CN104814754A (zh) * | 2015-04-01 | 2015-08-05 | 王有彬 | 正电子发射神经断层扫描装置 |
KR20170021558A (ko) * | 2015-08-18 | 2017-02-28 | 삼성메디슨 주식회사 | 초음파 진단 장치 및 그 동작방법 |
KR102490069B1 (ko) * | 2015-08-18 | 2023-01-19 | 삼성메디슨 주식회사 | 초음파 진단 장치 및 그 동작방법 |
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