EP3523778A1 - Method and device for processing at least one image of a given part of at least one lung of a patient - Google Patents
Method and device for processing at least one image of a given part of at least one lung of a patientInfo
- Publication number
- EP3523778A1 EP3523778A1 EP17777294.4A EP17777294A EP3523778A1 EP 3523778 A1 EP3523778 A1 EP 3523778A1 EP 17777294 A EP17777294 A EP 17777294A EP 3523778 A1 EP3523778 A1 EP 3523778A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lung
- histogram
- threshold
- images
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 210000004072 lung Anatomy 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012545 processing Methods 0.000 title claims abstract description 10
- 230000002685 pulmonary effect Effects 0.000 claims abstract description 40
- 230000007170 pathology Effects 0.000 claims abstract description 8
- 230000011218 segmentation Effects 0.000 claims description 24
- 230000010339 dilation Effects 0.000 claims description 13
- 201000003883 Cystic fibrosis Diseases 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 8
- 210000000621 bronchi Anatomy 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 208000025678 Ciliary Motility disease Diseases 0.000 claims description 2
- 238000004590 computer program Methods 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims description 2
- 201000009266 primary ciliary dyskinesia Diseases 0.000 claims description 2
- 238000004422 calculation algorithm Methods 0.000 claims 1
- 238000003709 image segmentation Methods 0.000 claims 1
- 206010006451 bronchitis Diseases 0.000 abstract description 3
- 238000003672 processing method Methods 0.000 description 8
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- 238000004891 communication Methods 0.000 description 4
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- 206010061218 Inflammation Diseases 0.000 description 2
- 208000019693 Lung disease Diseases 0.000 description 2
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- 101150029409 CFTR gene Proteins 0.000 description 1
- 208000026350 Inborn Genetic disease Diseases 0.000 description 1
- 208000004852 Lung Injury Diseases 0.000 description 1
- 208000032536 Pseudomonas Infections Diseases 0.000 description 1
- 208000004756 Respiratory Insufficiency Diseases 0.000 description 1
- 206010069363 Traumatic lung injury Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
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- 229960004508 ivacaftor Drugs 0.000 description 1
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Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/541—Control of apparatus or devices for radiation diagnosis involving acquisition triggered by a physiological signal
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/162—Segmentation; Edge detection involving graph-based methods
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20072—Graph-based image processing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30061—Lung
Definitions
- the present invention relates to a method and a device for treating at least one image of a given part of at least one lung.
- the method according to the invention finds application in the monitoring of pathologies that induce diffuse dilation of the bronchi of the lungs. STATE OF THE ART
- Cystic fibrosis is the most common inherited genetic disorder of the Caucasian population with an incidence of 1/4500. The life expectancy of patients has increased significantly since its description in 1938, now reaching a little over 40 years and, to date, the population of adults with cystic fibrosis is higher than that of children. Respiratory disease remains the most important cause of death. While the lungs of affected patients are almost free at birth, the increase in the viscosity of bronchial secretions causes their accumulation in the airways and the formation of mucous plugs, or mucoid impactions. Infections, and in particular chronic Pseudomonas aeruginosa infection, favored by defective mucociliary clearance, maintain and aggravate mucoid impactions and bronchial inflammation.
- An object of the invention is to overcome at least one of the above drawbacks.
- Segmentation of the cutting image (s) of the given part of the lung to produce a characteristic histogram of the pulmonary density of the given part of the lung, using the voxels of the cutting image or images, each voxel being associated at a given lung density,
- the fact of making the threshold depend not only on the mode of the histogram but also on the standard deviation of the data of the histogram makes it possible to take into account the variations of the "spreading" of the histogram, these variations being related to the degree of inspiration). This makes it possible to increase the correlation between the automatic score obtained on the basis of this threshold and the FEV1 of the patient considered, and consequently the reliability of the automatic score.
- FIG. 1 schematically represents an image acquisition and processing system according to one embodiment of the invention.
- Figure 2 shows three histograms of pulmonary density relating to a patient with ordinate the number of voxels.
- FIG. 3 is a flowchart of steps of an automatic image processing method according to one embodiment of the invention.
- FIG. 4 is a correlation curve between the evolution of an automatic score making it possible to qualify the bronchial attack obtained by an automatic image processing method according to one embodiment of the invention, and the evolution of the expiratory volume in 1 second (FEV1) corresponding.
- Figure 5 shows two pulmonary density histograms relating to a patient.
- FIG. 6 is a curve of evolution over time of the value of dilation scores calculated for different patients by means of a treatment method according to a first embodiment of the invention
- FIG. 7 is a curve of evolution over time of the value of dilation scores calculated for different patients by means of a treatment method according to a second embodiment of the invention.
- a system comprises an image acquisition device 1 of a lung, and an image processing device 2.
- the image acquisition device 1 is known from the state of the art; these measures
- 1 is for example an X-ray scanner or a magnetic resonance imaging device (RM).
- RM magnetic resonance imaging device
- the image processing device 2 is configured to process images acquired by the device 1.
- the image processing device 2 comprises a communication interface 4 with the acquisition device 1, a segmentation module 6, a processor 8, and a memory 10.
- the communication interface 4 is adapted to receive images acquired by the acquisition device 1.
- This communication interface 4 is for example wired or wireless type (Wi-Fi, etc.).
- the devices 1 and 2 form two internal components of a single device.
- the segmentation module 6 is configured to analyze the content of images provided by the acquisition device 1 and to extract certain information.
- the segmentation module 6 is for example configured to run the Myrian® computer program or the Syngo.via® program, known from the state of the art. Other alternative segmentation programs known from the state of the art can be used by the segmentation module 6.
- the processor 8 is configured to perform calculations based on such information.
- the memory 10 is adapted to store images or calculation data produced by the segmentation module 6 and / or the processor 8.
- the device 1 acquires at least one image of at least a given portion of at least one lung of a patient.
- the one or more images have been acquired during inspiration of the patient. It will be seen in the following that this increases the reliability of the output data of the process.
- the images are in section with a certain thickness; the images differ according to the cutting thickness considered for the images.
- the images show all of the two lungs, or show one or more lobes of the lungs.
- the images are of the tomodensitometric type. Alternatively, it could be used for the invention an MRI.
- Each image received is typically in grayscale.
- a pixel or voxel close to black is representative of a portion of the lung shown in this image which is sparse.
- a pixel or voxel close to white is representative of a portion of the lung represented in this image which is very dense.
- the plurality of 2D images forms a three-dimensional image comprising a plurality of voxels, each voxel relating to an elemental volume of the lung represented by the images.
- each voxel of the plurality of images has a gray level; a voxel close to black is representative of an elementary volume of the lung which is not very dense, and, on the other hand, a voxel close to white is representative of a very dense elementary volume of the lung.
- the segmentation module 6 segments the plurality of images it receives, so as to produce, on the basis of these images, a histogram characteristic of the lung density from the plurality of images.
- the histogram is a curve taking on the abscissa a pulmonary density, expressed in units on the Hounsfield scale (UH), and on the ordinate a number of voxels.
- the histogram indirectly enumerates, for each gray level represented in the image, the number of voxels of the plurality of images having this gray level.
- FIG. 2 Three examples of characteristic pulmonary density histograms are shown in Figure 2. These three histograms correspond to three pluralities of images acquired in a patient without lung disease who had 3 scanners at 1 year intervals (CT1, CT2 and CT3). .
- the modes associated with these three histograms are respectively -899 HU, -888 HU and -868 HU.
- the histogram mode also called the dominant value, is the pulmonary density of the histogram associated with the largest number of voxels in this histogram. This mode is therefore indicative of the gray level that comes up most frequently in the plurality of images.
- the mode is determined by the segmentation module 6 or the processor 8.
- the processor calculates a pulmonary density threshold based on one or more characteristics of the histogram.
- a first feature used by the method is the mode of the histogram.
- the pulmonary density threshold may also depend on the standard deviation of the density values of the histogram which is a second characteristic used by the method.
- the threshold is for example calculated as follows by the processor 8:
- the threshold thus makes it possible to separate the voxels of the histogram into 2 groups.
- N is in a range from 0 to 4 and the threshold is a high threshold. Very preferably, N is in a range from 1 to 3.
- the threshold When N is strictly positive, the threshold is therefore a density value which is shifted to the right on the histogram; when N is strictly negative, the threshold is therefore a density value which is shifted to the left on the histogram and the threshold is a low threshold. In both cases, this threshold is therefore associated with a number of voxels less than the maximum of the histogram.
- it is considered N positive and a lung volume whose density is located above this threshold.
- This proportion of too dense lung which is a reflection of the proportion of sick lung, is obtained through the use of a personalized threshold calculated on the properties of the histogram of each examination.
- This personalized threshold responds to the main problem encountered in CT quantification, which is the variability of the distribution of pulmonary densities according to the degree of inspiration, making the use of non-personalized thresholds inefficient.
- the processor then calculates a ratio between the lung volume having a defined lung density relative to the calculated threshold and a total lung volume shown by the image.
- the processor also determines, from the images of the lung, a lung volume having a lung density greater than or less than the calculated threshold.
- the processor can count the total number of voxels in the part of the histogram to the right of the calculated threshold, and multiply this number by the elemental volume of a voxel.
- the processor further determines a total volume of the lung shown by the plurality of images.
- the processor can count the total number of voxels counted in the histogram, and multiply this number by the elementary volume of a voxel.
- the processor then calculates a bronchial dilation score from the total volume and lung volume having a lung density greater than or less than the calculated threshold.
- the calculated score is stored in the memory 10.
- the score is calculated as follows:
- score is calculated as follows: score
- the development cohort is a multicenter cohort of patients followed longitudinally (at least 2 available examinations per patient, 40 scanners analyzed in total) with pre- and post-drug scans (ivacaftor) effective for the treatment of these patients with particular mutation: the G551 D mutation of the CFTR gene involved in cystic fibrosis.
- the objective was to verify that the clinical and functional improvement under treatment was also observed with the dilation score obtained by the image processing method described above.
- the second cohort is an independent mono-centric cohort corresponding to a group of patients evaluated at the Cochin hospital in Paris in 2013, as part of their follow-up every 2 years (53 patients).
- FEV1 force expiratory volume in 1 second
- FEV1 is a reference standard, recommended by both the Food and Drug Administration and the European Medicine Agency, to estimate the severity of CF in clinical research protocols.
- Thresholds according to other embodiments of the invention, depending both on the mode of the histogram and also on the standard deviation of the data of the histogram
- Table 1 also lists the correlation coefficient between the Brody I score and FEV1 (line 1 1).
- the threshold depend on parameters specific to the person being examined, namely the mode and advantageously the standard deviation or standard deviation of the histogram, therefore makes it possible to take into account inter-patient variations (variations related to the degree of inspiration of patients) and variations in technical parameters.
- the automatic score obtained on the basis of such an adaptive threshold remains correlated with FEV1. over time, even if the patient inspires differently or if the previously mentioned technical parameters change.
- the fact of making the threshold depend not only on the mode of the histogram but also on the standard deviation of the data of the histogram makes it possible to take into account the variations of the "spreading" of the histogram, these variations being related to the degree of inspiration). This makes it possible to further increase the correlation between the automatic score obtained on the basis of this threshold and the FEV1.
- Table 1 illustrates that the value of the correlation coefficients between the different bronchial dilation scores according to the embodiments of the invention (line 10) and the FEV1 are close to the correlation values between the Brody II score and FEV1 (line 1 1), regardless of the segmentation program used.
- the automatic score obtained by the implementation of the image processing method described above is of equivalent relevance to that of the Brody II score, but much simpler to obtain than the latter.
- Table 2 below does not study the correlation of instantaneous scores with FEV 1, as in Table 1, but the correlation of the variation of these same scores ( ⁇ score) over a 19-month follow-up period in average, with the change in FEV1 over the same period.
- FIG. 4 there is a curve showing the correlation between the evolution of an automatic score obtained by the image processing method according to one embodiment of the invention and the evolution of FEV1.
- Figure 5 shows two histograms relating to the same patient, but produced by the segmentation module 6 from images acquired respectively while the patient inspires, and while the patient expires. It can be seen that these two histograms are different. In particular, the histogram obtained from the inspiration images has a lower standard deviation than the histogram obtained from the expiration images.
- the images are preferably acquired while the patient is inhaling. This makes it possible to improve the correlation between the automatic score obtained and the FEV1.
- the segmentation implemented by the segmentation module and the calculations performed by the processor can be performed on the basis of a single image.
- the score may also depend on coefficients associated with the segmentation program used. It turns out that the histograms produced by different segmentation programs are not perfectly identical; therefore, such coefficients can further increase the correlation between the automatic score obtained and FEV1.
- the automatic score can be calculated not on the basis of a lung volume having a lung density greater than the calculated threshold, but on the basis of a lung volume having a density less than the calculated threshold. In this case, the lower the score, the less dense the patient's lung.
- the automatic score can advantageously be used to measure a level of impairment of the patient to a pathology inducing a diffuse pathology of the bronchi of the lungs, such as cystic fibrosis or primary ciliary dyskinesia or diffuse postinfective or idiopathic bronchial dilations.
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1659565A FR3057094B1 (en) | 2016-10-04 | 2016-10-04 | METHOD AND DEVICE FOR PROCESSING AT LEAST ONE IMAGE OF A DATA PART OF AT LEAST ONE LUNG OF A PATIENT |
PCT/EP2017/075246 WO2018065482A1 (en) | 2016-10-04 | 2017-10-04 | Method and device for processing at least one image of a given part of at least one lung of a patient |
Publications (1)
Publication Number | Publication Date |
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EP3523778A1 true EP3523778A1 (en) | 2019-08-14 |
Family
ID=58401634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17777294.4A Withdrawn EP3523778A1 (en) | 2016-10-04 | 2017-10-04 | Method and device for processing at least one image of a given part of at least one lung of a patient |
Country Status (4)
Country | Link |
---|---|
US (1) | US11017528B2 (en) |
EP (1) | EP3523778A1 (en) |
FR (1) | FR3057094B1 (en) |
WO (1) | WO2018065482A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP7047574B2 (en) * | 2018-04-26 | 2022-04-05 | コニカミノルタ株式会社 | Dynamic image analysis device, dynamic image analysis system, dynamic image analysis program and dynamic image analysis method |
FR3099621B1 (en) * | 2019-07-31 | 2021-12-31 | Inst Nat Sante Rech Med | METHOD FOR GENERATION OF A BIOMARKER, SYSTEM |
CN111598853B (en) * | 2020-04-30 | 2024-02-13 | 讯飞医疗科技股份有限公司 | CT image scoring method, device and equipment for pneumonia |
CN112083993B (en) * | 2020-09-02 | 2024-06-07 | 上海联影医疗科技股份有限公司 | Scanning protocol generation method and device, electronic equipment and storage medium |
Family Cites Families (2)
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WO2013003826A1 (en) * | 2011-06-29 | 2013-01-03 | The Regents Of The University Of Michigan | Analysis of temporal changes in registered tomographic images |
US20160203263A1 (en) * | 2015-01-08 | 2016-07-14 | Imbio | Systems and methods for analyzing medical images and creating a report |
-
2016
- 2016-10-04 FR FR1659565A patent/FR3057094B1/en active Active
-
2017
- 2017-10-04 US US16/339,615 patent/US11017528B2/en active Active
- 2017-10-04 EP EP17777294.4A patent/EP3523778A1/en not_active Withdrawn
- 2017-10-04 WO PCT/EP2017/075246 patent/WO2018065482A1/en unknown
Also Published As
Publication number | Publication date |
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US11017528B2 (en) | 2021-05-25 |
US20200051240A1 (en) | 2020-02-13 |
FR3057094B1 (en) | 2019-09-20 |
WO2018065482A1 (en) | 2018-04-12 |
FR3057094A1 (en) | 2018-04-06 |
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