WO2018148859A1 - 17 segment myocardial scoring system - Google Patents

Abstract

A 17 segment myocardial scoring system, comprising: a frame capturing end, used for capturing dynamic contrast video frames; an image processing module, for extracting blood vessel boundaries and heart boundaries in a dynamic contrast image on the basis of the video frames captured by the frame capturing end, the blood vessel boundaries constituting blood vessels for segment scoring, and when the heart is at minimum volume, performing width sampling of a blood vessel on the video frame of the dynamic contrast image at this time at equal intervals, recording the trajectory of the blood vessel boundaries of said width, comparing said width with the width of the blood vessel at the same position in the video frames between the minimum volume and maximum volume of the heart, and finding a blood vessel position record with a blood vessel width dilation ratio below a set threshold; and a segment setting end, for dividing and scoring the segments of the blood vessels on the video frame. The present system can rapidly calculate an overall myocardial score, avoiding a complex and extensive calculation process, and making the scoring more accurate.

Description

17-segment myocardial scoring system Technical field

The present invention relates to the recognition and evaluation of cardiac contrast images, and in particular to a 17-segment myocardial scoring system.

Background technique

Coronary heart disease is the leading cause of death. Coronary angiography has been used clinically as a routine examination, so it is both possible and a huge challenge to collect useful information from a large number of patients with coronary arteries (normal or diseased). A method is needed to systematically describe the anatomical features of the coronary tree and to quantify the complexity of vascular lesions in patients with coronary heart disease, thereby obtaining important information on the health and prognosis of patients. The Syntax score, based on the AHA-recommended coronary tree segmentation nomenclature, can be used to determine the number, location, complexity, and impact on cardiac function of coronary lesions. The higher the Syntax score, the more complex the lesion. But it must be acknowledged that the Syntax system has its limitations. An obvious shortcoming is that in the Syntax system, coronary circulatory typing is overly simplistic, with only type 2: left dominant and right dominant. This over-simple typing does not reflect the large variation of the coronary vasculature. More importantly, the Syntax scoring system is essentially based on blood vessels, not a scoring system based on the importance of blood vessels, so its limitations are self-evident. For example, the coronary segment 12 is a middle branch vessel, and according to the Syntax system, its weight is 1 regardless of its size (>1.5 mm). In fact, the median branch vessels between individuals vary greatly, from negligible to large enough to supply blood to the entire blunt edge region. The traditional Syntax score trial has fewer classifications and a longer calculation time.

Summary of the invention

In order to solve the above problems, it is an object of the present invention to provide a 17-segment myocardial scoring system capable of rapid quantitative grading of cardiac contrast images.

The technical solution adopted by the present invention to solve the technical problem thereof is:

The 17-segment myocardial scoring system includes:

a frame capture end for capturing a video frame of a dynamic contrast video;

The image processing module extracts a blood vessel boundary and a heart boundary in the dynamic contrast image according to the video frame captured by the frame capturing end, the blood vessel boundary constitutes a blood vessel for the segment score, and the heart boundary is used to determine a regular waveform of the heart beat, according to the regular waveform, At the minimum volume of the heart, the blood vessels on the video frame of the dynamic contrast image at this time are sampled at equal intervals, and the trajectory of the blood vessel boundary where the width is located is recorded, and the width between the aforementioned width and the minimum volume of the heart to the maximum volume is recorded. Aligning the widths of the blood vessels at the same position in the frame, and finding a blood vessel position record in which the blood vessel width expansion ratio is lower than a set threshold;

The segment setting end divides the blood vessels on the video frame into segments;

The segment weight database stores the weight data of the blood vessel segment, and generates a score by dividing the weight data by dividing the blood vessel at the segment setting end.

Preferably, a marking module is further included, and the blood vessel is marked as a high to low gray scale map according to a height mark module of a change in blood vessel width.

Advantageously, said set threshold is an average of a percentage change in vessel width.

The advantages of the invention are:

When the heart is pulsating, due to short-term occlusion caused by vascular lesions, the pressure behind the occlusion is drastically reduced, and the vasodilation is insufficient. The position of the vascular expansion is determined by image processing to locate the position of the diseased vessel, and the segmentation can be quickly calculated. The overall score of the myocardium avoids complicated and extensive calculations, making the scores more accurate.

DRAWINGS

Figure 1 shows three anatomical landmarks on the left ventricular surface that outline three regions.

Figures 2, 3, and 4 show six types of right coronary superiority.

5, 6, and 7 are front descending branches (abc) of different lengths and diagonal branches (def) of different sizes.

Figures 8 and 9 show the scores of the coronary vessel segments.

Figures 10, 11, and 12 show the distribution of coronary vessel weight factors.

Figure 13 is a case where the lesion score needs to be corrected. The upper row is an occlusive lesion and the lower row is a non-occlusive lesion.

Figure 14 is an example of a conventional score generation.

Fig. 15 is an example of score generation after lesion correction.

detailed description

The present invention is further described below in conjunction with the accompanying drawings and embodiments:

The 17-segment myocardial scoring system includes:

The frame capture end is used to capture the video frame of the dynamic contrast video; the coronary angiography video is introduced into the frame capture end, and the frame capture end separates the single frame images in the video one by one.

The image processing module extracts the blood vessel boundary and the heart boundary in the dynamic contrast image according to the video frame captured by the frame capturing end, and the blood vessel boundary and the heart boundary adopt the Matlab edge detection operator commonly used in image processing such as canny, sobel, etc. to extract the edge, according to the extraction The largest edge is the boundary of the heart. When the heart moves, the heart size fluctuates each time, the video frame between the peaks and valleys is intercepted, the edge is extracted again, and the outermost continuous edge (ie the heart boundary) is filtered out. Leaving a continuous blood vessel boundary, the blood vessel boundary constitutes a blood vessel for segment scoring, and the heart boundary is used to determine a regular waveform of the heart beat. According to the regular waveform, at the minimum volume of the heart, the video frame of the dynamic contrast image at this time is The blood vessels are sampled at equal intervals, the width of the sample is perpendicular to the central axis of the vessel extension, and the trajectory of the vessel boundary where the width is located is recorded, and the width is the same as the position between the smallest volume of the heart and the maximum volume in the video frame. Aligning the vessel widths to find a vessel position record with the vessel width expansion ratio below a set threshold;

Segment setting end, segmentation of blood vessels on video frames; by manual marking each segment using the following naming method and segmentation:

54 coronary circulation types

According to the right coronary artery blood supply range, the coronary circulatory system is divided into six types:

PDA zero: The left heart only receives blood from the left coronary system, and the right coronary system does not supply blood to the left heart. This is called the left dominant type (Fig. 2a).

The only posterior descending branch (PDA only): the right coronary artery system only sends the posterior descending branch to the posterior interventricular sulcus to supply blood for the posterior chamber. The left ventricular hypospadiaa was supplied by the left circumflex artery (Fig. 2b).

Small right coronary artery type (small RCA): In addition to the posterior descending branch, the right coronary artery system also sends a posterior lateral branch to supply a part of the lower chin. The remaining lower jaw surface was supplied by the posterior branch originating from the left circumflex artery (Fig. 3c).

Ordinary right coronary artery (average RCA): the posterior descending branch of the right coronary artery and the posterior collateral perfusion interval and the entire chin surface (Fig. 3d).

Large right coronary artery type (large RCA): In addition to the posterior descending branch and the posterior branch perfusion interval and the entire chin surface, the right coronary artery system also emits a small blunt edge to infuse a small part of the left blunt edge. This part of the left heart blunt edge should have been supplied by the circumflex artery (Fig. 4e).

Super RCA: The right coronary artery system, in addition to the posterior descending branch and the posterior branch perfusion interval and the entire chin surface, also issued a considerable blunt edge to infuse a considerable portion of the left blunt edge. This part of the left blunt edge should have been supplied by the circumflex artery (Fig. 4f).

According to the blood supply range of the anterior descending branch (excluding the diagonal branch), the coronary circulatory system is divided into three types: short (Fig. 5a), normal (Fig. 5b) and long (Fig. 6c) anterior descending branch type 3; The scope of blood supply, coronary circulatory system is divided into 3 types: small (Fig. 6d), medium (Fig. 7e) and large (Fig. 7f) diagonal branch type 3, a total of 54 coronary circulation types, 17-segment myocardial scoring system will These 54 types of coronary circulation are used to reflect the large variation of the coronary tree between individuals.

In our scoring system, the definitions of segment 16 series, 7 series, 9 series, 12 series, 14 series, and segments 11, 13, and 15 are modified compared to the conventional definition. The definitions of each coronary segment in this scoring system are detailed below.

Refer to Figure 8, Figure 9, the name of the coronary tree segment

Seg 1. RCA proximal: The right crown opens to half of the sharp edge of the heart.

Seg 2.RCA Mid: At the end of the first segment to the sharp edge of the heart.

Seg 3.RCA Distal: The beginning of the heart sharp to the posterior descending branch, usually in the right posterior atrioventricular sulcus.

Seg 4.PDA from RCA: originated from the posterior descending branch of the right crown, walking in the posterior interventricular sulcus.

Seg 16. Originated from the posterior branch of the right crown: starting at the beginning of the posterior descending branch, walking in the left posterior atrioventricular sulcus, issuing branches to the left ventricle for blood supply.

In the right dominant type, the left ventricle usually supplies blood from 1-2 posterior branches originating from the right coronary artery. One posterior lateral branch is usually larger and is called seg 16&. If the two rear side branches are equal, they are named seg 16a and 16b, respectively. If the two posterior branches are not equal, the larger one is named seg 16X, and the smaller one is named seg 16S.

Seg 16a. originates from the posterior collateral of the equal size (compared to the other posterior branch) of seg 16.

Seg 16b. originates from the posterior branch of the seg 16 equal (compared to the other posterior branch).

Seg 16X. originates from the larger posterior branch of seg 16, independent of the firing position.

Seg 16S. originates from the smaller posterior branch of seg 16, independent of the firing position.

Seg 16&. originated from only one large posterior branch of seg 16.

Seg 16c. originates from the blunt edge of seg 16 and infuse a part of the blunt edge.

Seg 5. From the left coronary artery, the end of the anterior descending branch and the circumflex branch.

Seg 6.LAD proximal (proximal descending branch): The first main perforating branch is near the segment and includes the main perforating branch opening.

Seg 7.LAD mid (middle section of the lower descending branch): starting from the first main piercing branch, ending at the corner of the front descending branch at the right front oblique position. If the angle is not obvious, it stops at the midpoint of the first piercing of the apex.

The anterior descending branch usually emits 1-2 diagonal branches from the proximal or middle segment (seg 6 or 7). When only one diagonal branch is issued, it is usually larger and is named seg 9&. If the two diagonal branches are equal, they are named seg 9a and seg 9b, respectively. If the two diagonal branches are not equal, the larger one is named seg 9X, and the smaller one is named seg 9S. Larger diagonal branches are mostly from seg 6.

Seg 9a. The first diagonal branch of the same size from seg 6 or 7.

Seg 9b. A second diagonal branch of the same size from seg 6 or 7.

Seg 9X. A larger diagonal branch from seg 6 or 7, regardless of its position.

Seg 9S. Smaller diagonal branch from seg 6 or 7, regardless of its position.

Seg 9&. usually comes from seg 6 with only one large diagonal branch.

Seg 7&. only issued a mid-lower section of a large diagonal branch.

Seg 7X. The mid-lower section of the larger diagonal branch.

Seg 7S. The mid-lower section of the smaller diagonal branch.

Seg 7E. Issue the middle section of the forward descending branch of the equal diagonal branch.

Seg 7. The middle section of the front descending branch without a diagonal branch. The only large diagonal branch is usually from seg 6.

Seg 8.LAD distal: From the end of the previous section, stop at the apex or bypass the apex, and walk in the anterior chamber groove, which is the end part of the anterior descending branch.

Seg 11.Proximal LCX (proximal circumflex): The circumflex trunk, starting from the left main trunk and ending at the blunt edge of the heart.

The gyroscopic branch usually emits 1-2 blunt edge branches. The only one blunt edge is usually larger and is named seg 12&. If the two blunt edge branches are equal, they are named seg 12a and 12b, respectively. If the two blunt edges are not equal, the larger one is named 12X and the smaller one is named 12S.

Seg 12a. The first blunt edge of the same size from the circumflex, running on the blunt edge of the heart.

Seg 12b. The second blunt edge of the same size from the circumflex, running on the blunt edge of the heart.

Seg 12X. The larger blunt edge of the circumflex, which travels on the blunt edge of the heart, regardless of its position.

Seg 12S. The smaller blunt edge of the circumflex, which travels on the blunt edge of the heart, regardless of its position.

Seg 12&. Only one large blunt edge is from the circumflex branch and travels on the blunt edge of the heart, regardless of its position.

Seg interX. Larger intermediate branch, equivalent to seg 12X.

Seg interS. Smaller intermediate branch, equivalent to seg 12S.

Seg interE. Smaller intermediate branch, equivalent to seg 12a or 12b.

Seg inter&. is only a large blunt edge, equivalent to seg 12&, perfused with a blunt edge of the heart. Independently, the volunteers independently issued a pivotal branch and walked in the left posterior chamber.

Seg 13. LCX Distal: Starting at the blunt edge of the heart, along the left posterior chamber. Right advantage type, its size Usually smaller or absent, and in the left dominant type, the size is usually larger.

In the left dominant type, the left ventricle is usually supplied with blood from 1-2 posterior branches from the LCX. The only large back side branch is named seg 14&. If the two rear side branches are equal, they are named 14a and 14b, respectively. If the two side branches are not equal, the larger one is named 14X and the smaller one is named 14S.

Seg 14a: The first posterior branch of the same size from seg 13.

Seg 14b: The second posterior branch of the same size from seg 13.

Seg 14X: The larger rear side branch from seg 13 regardless of its position.

Seg 14S: The smaller rear side branch from seg 13 regardless of its position.

Seg 14&: The only large posterior branch from seg 13 regardless of its position.

Seg 15: After the fall. The farthest segment of the gyroscopic branch from seg 13 travels in the posterior interventricular sulcus and is spaced after perfusion.

According to the percentage of the width of the blood vessel in the segment after the marking relative to the set threshold, the weight of the segment lesion is determined, and the factors of each segment are added to generate a score.

The segment weight database stores the weight data of the vascular segment, and the weighting data is generated by the segment setting end to collect the weight data, and the weight data and the weight calculation adopt the following rules:

Calculation and Derivation of Coronary Tree Weighting Factors

The derivation of the coronary tree weighting factor is based on the following rules:

1) Competitive blood supply rules for three regions;

There are clearly three anatomical landmarks on the left ventricular surface: the anterior interventricular sulcus, the posterior interventricular sulcus, and the blunt margin. These three anatomical landmarks divide the left heart into three regions: the compartment, including the anterior and posterior septum (Fig. 1c); the diagonal branch-blunt edge, including the anterior and lateral walls, but not over the blunt edge Boundary (Fig. 1a); Lower ridge (Fig. 1b). Accordingly, there are three vessels that travel relatively constantly along these anatomical landmarks: the left anterior descending branch (12), the posterior descending branch, and the blunt edge branch, although the coronary vessel tree varies greatly between individuals.

Competitive blood supply rule

The compartment is competitively supplied by the anterior descending branch (excluding the diagonal branch) and the posterior descending branch (usually without major branches). A long anterior descending artery will reduce the blood supply range of the posterior descending branch, and vice versa. The diagonal-blunt edge zone is competitively supplied by the diagonal branch and the blunt edge. Large diagonal branches will reduce the blood supply range of the blunt edge, and vice versa. The lower jaw is competitively supplied by the posterior branch of the left or right crown. A huge right crown will reduce the circumflex blood supply range and vice versa.

2) The sum of the sub-vessel flows is equal to the main blood vessel flow rule;

3) Calculate the unknown weighting factor rule based on the key known anchor values.

Referring to Figure 10-12, in all 54 coronary circulation types, the total coronary weighting factor is constant at 17.0, the diagonal branch-blunt edge region vascular weighting factor is constant at 8.0, and the compartmental vascular weighting factor is constant. When it becomes 6.0, the lower vascular weight factor is constant at 3.0. In the RCA ordinary right dominant type, the LAD weighting factors of the far segment are different according to the length of the LAD, which are 1.0, 2.0 and 3.0, respectively; the diagonal weighting factors are different according to the diagonal branch size, which are 2.0, 3.0 and 4.0, respectively; the LCX weighting factor is The competitive blood supply rule for the diagonal branch-blunt edge region is 6.0, 5.0 and 2.0, respectively. When the diagonal branch size and the LAD length are the same, the RCA weighting factor is increased by 1.5 in steps from PDA only to super RCA type. Based on the above anchor values, the weighting factors of the 54 types of coronary trees can be derived therefrom. The blood vessels are the same, but the weighting factors are different, reflecting the difference in the number of left ventricular segments perfused between the vessels.

Average RCA dominant circulation with intermediate diagonals and average LAD in patients with common dominant, diagonal and anterior descending branches

Referring to the column of light-colored markers in Figure 11, among the patients with common dominant, diagonal and anterior descending branches, the right coronary artery is the lower septum and the lower tibia, with a total of 5 segments, with a weighting factor of 5.0. The anterior descending branch (except for the diagonal branch) provides blood for the anterior septum and apical segment, with a total of 4 segments; the diagonal branch provides blood for the anterior wall, for a total of 3 segments. Therefore, the anterior descending branch (including the diagonal branch) supplies blood for a total of 7 segments with a weighting factor of 7.0. The gyroscopic branch supplies blood to the remaining 5 segments with a weighting factor of 5.0. The total score was 17.0, corresponding to 17 segments of the left ventricular myocardium.

Specifically, in the normal right dominant type and the common diagonal branch, the distal anterior descending artery (distal LAD) is a apical interval segment and a apical segment of the apex segment, with a total of 2 segments, the weighting factor of which is 2.0. The mid-left anterior descending (mid LAD), if no diagonal branches are issued, will provide blood for the anterior septum, apical interval, and apical segment of the heart, for a total of three segments with a weighting factor of 3.0. If the mid-left descending branch (mid LAD) issues a diagonal branch, its weighting factor will be 6.0, 5.0 and 4.5 depending on the diagonal branch weight. The proximal LAD weighting factor is constant at 7.0 regardless of the position of the diagonal branch. The posterior descending branch (PDA) supplies blood to the lower interval of 2 segments, and its weighting factor is 2.0. The 1-2 posterior lateral branches supply blood to three segments of the inferior wall with a weight of 3.0. If the two posterior collateral vessels are not equal, the larger one has a weight of 2.0 and the smaller one has a weight of 1.0. If the two rear side branches are equal, each weight is 1.5. Only one large posterior branch was provided, and blood was supplied to three segments of the inferior wall with a weighting factor of 3.0. The sum of the posterior descending branch (PDA) and the posterior branch weight is 5.0, which is also the far right crown (distal RCA) weight. The circumflex branch emits 1-2 blunt edge branches, and the size is equal or large. The only large blunt edge that was issued was a blood supply for 5 segments with a weighting factor of 5.0. If the two blunt edge branches are not equal, then the larger One weight is 3.0, and the smaller one is 2.0. If the two blunt edge branches are equal, each weight is 2.5. The Seg inter series (seg interX, S, E, and &) represent intermediate branches of different sizes, with weighting factors corresponding to the seg 12 series (seg 12X, 12S, 12a, 12b, and 12&).

The weighting factor of the same blood vessel changing between different individuals reflects the constant change in the number of myocardial segments supplied by the blood vessel. However, of the 54 coronary cycle types, the total weighting factor was constant at 17.0.

In our 17-segment myocardial scoring system, the importance of blood vessels depends on the number of myocardial segments supplied by the blood vessels rather than the blood vessels themselves. In all of the 54 coronary circulation types, the weighting factor assignment of a vessel is based on the number of myocardial segments perfused by the vessel.

The degree of vascular stenosis is also considered when deriving the 17-segment myocardial model scoring system. The integral is the product of the vascular weighting factor and the degree of stenosis (Equation 1). If the blood vessel is completely blocked, the weighting factor is multiplied by 5. If the diameter of the blood vessel is narrowed by 50-99%, the weighting factor is multiplied by 2, and then the integrals obtained from the vascular segment are added to obtain the total coronary artery integral (21). A score of 0 indicates that the coronary tree has no stenosis. The higher the score, the more severe the stenosis.

S=W×D(1)

Where S is a 17-segment model score;

W is the weighting factor of the blood vessel;

D is the degree of vascular stenosis.

Lesion definition

More than 50% of the diameter stenosis was visually observed as a lesion (vessel diameter greater than 1.5 mm). In this scoring system, only two types of lesions were considered: occlusion (100% stenosis) and non-occlusion (50-99% diameter stenosis).

Lesion score

In this system, all lesions should be scored. The maximum number of lesions per patient was set to 12, and each lesion was labeled with a corresponding number from 1-12. Non-occlusive lesions involving two adjacent segments and no major side branches were scored only for the segment where the length of the 1/2 lesion was located. Non-occlusive lesions involve two adjacent segments, and there are primary side branches. If these side branches are sentenced to the same segment, the score correction should be made with reference to the situation listed in "Symbol Score Correction".

Lesion score correction

The lesion score should be corrected in the following cases:

Occlusive disease

In the same segment of the primary branch occlusive lesion, the main branch is normal (Fig. 13a), and the lesion score is corrected by Equation 2, because the main branch weight already includes the main branch weight, but in fact, the main branch is not involved.

S=subtotal score-W intact SBs×5;(2)

Among them, integer SBs refers to all normal side branches.

The main branch of the same segment of the occlusive lesion, involving the main branch (Fig. 13b), the lesion score is modified according to formula 3, because the main branch is an occlusive disease (multiplying factor is 5.0), and the main branch is a non-occlusive disease (phase The multiplication factor is 2.0), and the severity of the two is different.

S=subtotal score-W SBs*5-W involved SBs*5+W involved SBs*2;(3)

Among them, SBs refers to all normal or abnormal side branches. Involved SBs refer only to the affected side branches.

In the same segment of the primary branch occlusive lesion, there is another lesion (>1 lesion) in the main branch (Fig. 13c). The lesion score is modified according to Equation 4, because the main branch weight already includes the main branch weight, and the main branch weight It was also mistakenly treated as an occlusive lesion (multiplier factor of 5.0). In fact, the primary branch lesion is an independent lesion and should be scored separately (multiplier factor of 2.0).

S=subtotal score-W diseased SBs×5;(4)

Non-occlusive disease

The main branch of the same segment was non-occlusive disease, the main branch was normal, and it was earlier than the lesion (Fig. 13d). The score of the main branch lesion was modified according to Equation 5, because the main branch weight already included the main side branch weight, while the main side branch Not involved.

S=subtotal score-W intact SBs×2;(5)

The main branch of the same segment was a non-occlusive lesion involving the main side branch (1 lesion), and the lateral branch was earlier than the main branch lesion (Fig. 13e). The main branch lesion score was corrected according to Equation 6, and the affected primary side The score does not need to be scored because the affected side branch weights are already included in the main branch.

S=subtotal score-W involved SBs×2;(6)

The main branch of the same segment is non-occlusive disease, the main side branch also has lesions (>1 lesion), and the side branch is issued earlier than the main branch lesion (Fig. 13f), the main branch lesion score is corrected according to formula 7, because the main branch weight Primary branch weights have been included, however this major branch has to be scored as independent lesions.

S=subtotal score-W diseased SBs×2;(7)

Where S is the lesion segment correction score,

The Subtotal score is a regular score for the lesion.

W SBs is the main branch weight.

Intact SBs means that the main side branches are normal.

Involved SBs refers to the main side branch, but together with the main branch lesion should be considered as one lesion.

Diseased SBs refers to the main side branch and also has lesions, and is independent of the main branch lesions, and is an independent lesion.

In summary, in the same segment, all major side branches (>1.5mm in diameter), as long as the main branch lesions are issued, regardless of their normal, affected or independent lesions, the software score may overestimate the severity of the lesion due to the presence of the side branch Sex, so the side weight should be deducted to correct the score.

Preferably, the marking module further comprises: marking the blood vessel as a high-to-low gray scale map according to the height and low mark module of the blood vessel width change, thereby facilitating manual observation of the degree of lesion of the lesion.

Advantageously, said set threshold is an average of a percentage change in vessel width.

Rating example:

See Figure 14, an example of a regular score. In the large RCA, short LAD and common type of diagonal branch circulation type, the occlusive lesions were routinely scored (upper white arrow). In the oversized RCA, the normal LAD length and the common type of diagonal branch circulation type, the non-occlusive lesions were routinely scored (lower white arrow).

Referring to Figure 14, in the common LAD and large diagonal branch type, the main branch occlusive lesion of the same segment, involving the main branch (upper white arrow), the lesion score is corrected according to formula 3: 50-2*5 (9a )-2*5(seg 9b)-2*5(seg 9b)+2*2(seg 9b)=24. In the left dominant type, short LAD and large diagonal branch type, the main branch of the same section Non-occlusive disease, the main branch is normal, and is earlier than the lesion (white arrow in the figure below), the main branch lesion score is corrected according to formula 5: 14-4*2 (seg 9&)=6.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims (4)

A 17-segment myocardial scoring system characterized by: Including: a frame capture end for capturing video frames of dynamic contrast video; The image processing module extracts a blood vessel boundary and a heart boundary in the dynamic contrast image according to the video frame captured by the frame capturing end, the blood vessel boundary constitutes a blood vessel for the segment score, and the heart boundary is used to determine a regular waveform of the heart beat, according to the regular waveform, At the minimum volume of the heart, the blood vessels on the video frame of the dynamic contrast image at this time are sampled at equal intervals, and the trajectory of the blood vessel boundary where the width is located is recorded, and the width between the aforementioned width and the minimum volume of the heart to the maximum volume is recorded. Aligning the widths of the blood vessels at the same position in the frame, and finding a blood vessel position record in which the blood vessel width expansion ratio is lower than a set threshold; The segment setting end divides the blood vessels on the video frame into segments; The segment weight database stores the weight data of the blood vessel segment, and generates a score by dividing the weight data by dividing the blood vessel at the segment setting end. The 17-segment myocardial scoring system of claim 1 further comprising a labeling module for marking the blood vessel as a high to low grayscale map based on a high and low marker module of varying vessel width. The 17-segment myocardial scoring system of claim 1 wherein said set threshold is a mean of a percentage change in vessel width. The 17-segment myocardial scoring system of claim 1 wherein said segment weight database comprises a weighting factor distribution table of Figures 10-12.

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