WO2009104583A1 - Système d'affichage d'images et programme de traitement d'images - Google Patents

Système d'affichage d'images et programme de traitement d'images Download PDF

Info

Publication number
WO2009104583A1
WO2009104583A1 PCT/JP2009/052651 JP2009052651W WO2009104583A1 WO 2009104583 A1 WO2009104583 A1 WO 2009104583A1 JP 2009052651 W JP2009052651 W JP 2009052651W WO 2009104583 A1 WO2009104583 A1 WO 2009104583A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
display
characteristic
image data
lookup table
Prior art date
Application number
PCT/JP2009/052651
Other languages
English (en)
Japanese (ja)
Inventor
中澤　正行
陽一 小野
Original Assignee
コニカミノルタエムジー株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by コニカミノルタエムジー株式会社 filed Critical コニカミノルタエムジー株式会社
Publication of WO2009104583A1 publication Critical patent/WO2009104583A1/fr

Links

Images

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
    • A61B6/46—Arrangements for interfacing with the operator or the patient
    • A61B6/461—Displaying means of special interest
    • A61B6/463—Displaying means of special interest characterised by displaying multiple images or images and diagnostic data on one display
    • 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
    • A61B6/56—Details of data transmission or power supply, e.g. use of slip rings
    • A61B6/563—Details of data transmission or power supply, e.g. use of slip rings involving image data transmission via a network
    • 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
    • A61B6/56—Details of data transmission or power supply, e.g. use of slip rings
    • A61B6/566—Details of data transmission or power supply, e.g. use of slip rings involving communication between diagnostic systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/90—Dynamic range modification of images or parts thereof
    • G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/90—Determination of colour characteristics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
    • 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]
    • 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
    • G06T2207/10116—X-ray image

Definitions

  • the present invention relates to an image display system and an image processing program.
  • radiographs taken by medical diagnostic apparatuses such as X-ray diagnostic apparatuses, MRI (Magnetic Resonance Imaging) diagnostic apparatuses, and various CT (Computed Tomography) tomographic apparatuses are usually used. It is recorded on a light transmissive image recording film such as an X-ray film or other film photosensitive material, and is reproduced as a light transmissive image.
  • the film on which the diagnostic image is reproduced is set in an observation device called a schaukasten, and is observed in a state of being irradiated with light from the back, and a diagnosis of the presence or absence of a lesion is performed.
  • CRT Cathode Ray Tube
  • LCD Liquid Crystal Display liquid crystal display
  • diagnosis is performed by outputting a diagnostic image on a monitor, if there are a plurality of types of diagnostic images for one patient or patient information (medical chart) about the patient, the operation button or the like While switching the display mode, images are sequentially displayed one by one on each screen, and each medical information is displayed under appropriate conditions.
  • a CR image (FIG. 36 (a)), CT image (FIG. 36).
  • diagnostic images for a patient or patient information (medical chart) about the patient, it is desirable to display them on a single screen so that they can be compared and observed.
  • LUT lookup table
  • the LUT corresponding to the image characteristics of the image displayed on the image display device is changed every time correction according to the display characteristics of the image display device is performed.
  • the number of LUTs to be changed is the number of connected medical diagnostic apparatuses (image generating apparatuses such as CR apparatuses) ⁇ the number of image display apparatuses. For this reason, there exists a problem that work is complicated.
  • the first LUT is provided on the image display device or the video card, and the second LUT that operates on an application program for processing an image obtained from the medical diagnostic device is provided, and gradation correction of the image display device is performed.
  • a technique for separating the functions of the LUT has been proposed so that the result of performing the above is reflected in the first LUT and the gradation adjustment caused by the image characteristics of the medical diagnostic apparatus is performed by the second LUT (for example, , See Patent Document 1).
  • the first LUT corresponding to the display characteristics of the image display device is on the image display device or the video card.
  • the image display device needs to be able to store the LUT and be expensive with a function capable of rewriting the LUT through communication with the image processing device.
  • an expensive device capable of storing a video card and capable of rewriting the LUT according to data from the image processing apparatus is required.
  • Patent Document 1 does not consider the case where a plurality of image processing apparatuses are connected via a network, and reads and uses LUTs stored in other image processing apparatuses. Is not assumed. For this reason, when changing the candidate LUT in accordance with the model change of the image display apparatus, it takes time and effort to reinstall the LUT in a plurality of image processing apparatuses.
  • the present invention has been made in view of the circumstances as described above, and when a plurality of types of medical images are displayed on a display screen, the image is suitable for diagnosis according to the gradation characteristics of each image. It is an object to provide an image display system and an image processing program that can be displayed as.
  • An image display device that displays and outputs an image based on image data acquired by the medical diagnostic device, and at least image characteristics corresponding to the medical diagnostic device from which the image data is input with respect to the image data input from the medical diagnostic device
  • an image display system that applies a lookup table and a display characteristic lookup table corresponding to the image display device to be output, and displays an image based on image data on the image display device to be output.
  • Display characteristic lookup table storage means for storing a display characteristic lookup table for each combination of the type of the image display apparatus that is an output target candidate and the type of the medical diagnosis apparatus that is an image data input source candidate; A desired display characteristic lookup table is selected from the display characteristic lookup table storage means according to the type of the image display apparatus to be output and the medical diagnostic apparatus from which the image data is input, and the selected display characteristic look is selected.
  • Program storage means for storing an application program including a step of applying an uptable to image data; An image processing apparatus that processes image data acquired by the medical diagnostic apparatus according to the application program stored in a program storage unit, and displays an image based on the image data after image processing on the image display apparatus to be output; It is characterized by having.
  • the present invention also provides: For each image obtained from a medical diagnostic device, The image display of the output target from among a plurality of display characteristic lookup tables prepared for each combination of the type of the image display device that is an output target candidate and the type of the medical diagnosis device that is an image data input source candidate A display characteristic lookup table selection function for selecting a display characteristic lookup table to be used for processing according to the type of the apparatus and the medical diagnostic apparatus from which image data is input; Applying at least the image characteristic look-up table corresponding to the image characteristic caused by the medical diagnostic apparatus from which image data is input and the display characteristic look-up table selected by the display characteristic look-up table selection function to apply the medical diagnostic apparatus An image processing function for performing image processing on the image data acquired by the above is realized in a computer.
  • the present invention when images based on medical image data of a plurality of image types are displayed on the image display device, even when the gradation characteristics suitable for displaying images based on each medical image data are different, It is possible to display an image with gradation characteristics that matches the image type. Thereby, it is possible to simultaneously observe a plurality of images with high gradation display suitable for diagnosis, and it is possible to perform more appropriate diagnosis.
  • FIG. 3 is an explanatory diagram schematically illustrating an example of an LUT provided in the image characteristic LUT storage unit and the display characteristic LUT storage unit illustrated in FIG. 2. It is a figure which shows schematic structure of the image display apparatus shown in FIG. It is a graph showing the general display characteristic of a liquid crystal panel. 4 is a graph illustrating an example of a display characteristic LUT illustrated in FIG. 3. 4 is a graph illustrating an example of a display characteristic LUT illustrated in FIG. 3. 4 is a graph illustrating an example of a display characteristic LUT illustrated in FIG. 3.
  • FIG. 4 is a graph illustrating an example of a display characteristic LUT illustrated in FIG. 3.
  • 10 is an enlarged graph of a one-dot chain line portion of FIG. 9.
  • 11A is an explanatory diagram showing an example of conversion from a monochrome image signal to an RGB equivalent color image signal
  • FIG. 11B is an RGB unequal color image signal from the monochrome image signal. It is explanatory drawing which showed an example of conversion into. It is explanatory drawing which showed an example of the image at the time of converting a monochrome image signal into the RGB color image signal of an unequal value by the gradation control unit. It is explanatory drawing explaining the production
  • FIG. 24A is a table showing the contrast response based on the measured luminance value
  • FIG. 24B is a table showing the contrast response based on the standard luminance value.
  • FIG. 24B is a table showing the contrast response based on the standard luminance value.
  • FIG. 1 shows a schematic configuration example of a medical image system 1 to which an image display system 100 according to this embodiment is applied.
  • a medical image system 1 is obtained by medical diagnostic apparatuses 2, 2... That generate image data of a medical image (hereinafter simply referred to as “image”) obtained by imaging a patient.
  • a plurality of image processing apparatuses 3, 3... For performing predetermined image processing on the obtained image data.
  • a plurality of image display devices 4, 4... For displaying images based on the image data processed by the image processing devices 3, 3.
  • Each of the image processing apparatuses 3, 3,... And the medical diagnosis apparatuses 2, 2,... Is a communication network such as a LAN (Local Area Network) or a WAN (Wide Area Network) via a switching hub (not shown). Connected by 5).
  • a communication network such as a LAN (Local Area Network) or a WAN (Wide Area Network) via a switching hub (not shown). Connected by 5).
  • the network 5 conforms to, for example, DICOM (Digital Image and Communication Communications in Medicine) standards.
  • DICOM MWM Mode Worklist Management
  • DICOM MPPS Mode Performed Procedure Step
  • the network 5 is preferably configured to be connectable to other information management systems in the hospital such as HIS (Hospital Information System) / RIS (Radiology Information System) according to the DICOM standard.
  • HIS Hospital Information System
  • RIS Radiology Information System
  • the medical diagnosis apparatus is a CR (Computed Radiography) apparatus (hereinafter referred to as “CR”) 2a, a CT (Computed Tomography) 2b, and an MRI (Magnetic Resonance Imaging) apparatus (hereinafter “MRI”). ) 2c and an endoscope apparatus (hereinafter referred to as “endoscope”) 2d are connected to the network 5 one by one.
  • CR Computer Radiography
  • CT Computer Tomography
  • MRI Magnetic Resonance Imaging
  • endoscope an endoscope apparatus
  • a MRT Magnetic Resonance Tomography
  • a breast image generation device mammography
  • an FPD Felat Panel Detector
  • an ultrasonic image device a terminal device that provides image data of an electronic medical record, or the like
  • a terminal device that provides image data of an electronic medical record, or the like is connected to the network 5
  • a plurality of medical diagnostic apparatuses of the same type may be connected.
  • FIG. 2 shows a schematic configuration of the image display system in the present embodiment.
  • the image processing device 3a (PC1) has an image display device 4a (Display1-1), 4b (Display1-2), and the image processing device 3b (PC2) has an image display device 4c (Display2). -1), 4d (Display 2-2), and the image processing device 3c (PC3) are connected to image display devices 4e (Display 3-1), 4f (Display 3-2), respectively.
  • the number of image processing devices 3, 3 ... connected to the network 5 and the number of image display devices 4, 4 ... connected to the image processing devices 3, 3 ... are not limited to the illustrated example.
  • FIG. 3 schematically shows the image processing device 3 and the image display device 4 connected thereto.
  • the image display devices 4, 4... are monitors that display medical diagnostic images, for example.
  • the image display devices 4, 4... Have a liquid crystal panel (LCD (Liquid Crystal Display)) 41 as a display unit that displays a color image and a monochrome image based on the image data, and a display drive unit (not shown) that drives the liquid crystal panel 41. And a backlight (not shown) for irradiating the liquid crystal panel 41 with light from the non-observation side.
  • the display unit is not limited to the liquid crystal panel 41.
  • an organic EL display or the like may be applied as the display unit.
  • the backlight may be any one that can provide light sufficient to illuminate the liquid crystal panel 41.
  • an LED, a cold cathode fluorescent tube, a hot cathode fluorescent tube, and other light emitting elements can be applied. It is preferable that display with a maximum luminance of 500 to 5000 cd / m 2 is possible so that it can be suitably used for a monitor for medical purposes.
  • the type of the liquid crystal panel 41 applicable to the present embodiment is not particularly limited, and the display driving unit drives the liquid crystal panel 41 with respect to a TN (Twisted Nematic) method, an STN (Super Twisted Nematic) method, MVA ( Various driving systems such as a multi-domain (vertical alignment) system and an IPS (in-plane switching) system can be applied.
  • the liquid crystal panel 41 can reproduce the gradation of 8 bits (256 steps) for each of red (R), green (G), and blue (B) by a color filter (not shown). .
  • the liquid crystal panel 41 having three colors of red (R), green (G), and blue (B) is used, but red (R), green (G), and blue (B) are used.
  • red (R), green (G), and blue (B) are used.
  • three colors of yellow (Y), magenta (M), and cyan (C) may be used.
  • four or more colors may be used, six colors of R, G, B, Y, M, and C, and six colors of red (R1, R2), green (G1, G2), and blue (B1, B2) having different tones. But you can.
  • Image processing to be described later is not limited to three colors of red (R), green (G), and blue (B).
  • the present invention is not limited to the case where multicolor display is performed using a color filter, and can also be applied to an image display apparatus that performs multicolor display by switching a plurality of color light sources.
  • the image display devices 4, 4... are provided with measuring means 42 that measures display characteristics of an image displayed on a specific target region T of the liquid crystal panel 41.
  • a known color sensor such as a luminance meter or a chromaticity meter can be used according to the type of the liquid crystal panel 41.
  • the illustrated measurement means 42 is a contact type sensor, but a non-contact type sensor may be used, and any measurement means may be used.
  • the device configuration of the measuring means 42 can be applied to the image display devices 4, 4.
  • the measuring unit 42 measures the display characteristics to be displayed and outputs the measurement result (measured value) to the control unit 31 (see FIG. 2). Yes.
  • the display characteristics of the liquid crystal panel 41 are information regarding at least one of the values of R, G, and B input to the liquid crystal panel 41 and the luminance and chromaticity of display light corresponding thereto.
  • a commonly used color index can be used.
  • XYZ color system, X 10 Y 10 Z 10 color system, xyz chromaticity coordinates, x 10 y 10 z 10 chromaticity coordinates, UCS chromaticity, L * a * b * color system, L defined by CIE * C * h * color system, L * u * v * color system, and the like can be mentioned, but the invention is not limited thereto.
  • Information on luminance and / or chromaticity may be measured at a predetermined timing using the measuring means 42 by displaying a test pattern on the target region T of the liquid crystal panel 41, or may be measured on the liquid crystal panel 41 at the time of factory shipment.
  • the result of measurement by displaying may be stored.
  • the correspondence relationship of the information on the luminance and / or chromaticity with respect to the values of R, G, B may be stored as a predetermined conversion formula without using the measurement results for the individual image display devices 4, 4,. Good.
  • the measuring means 42 measures the display characteristics, but in this embodiment, a region having an area of about 10% in the central portion of the display screen of the liquid crystal panel 41. Shall be pointed to.
  • the measuring means 42 is connected online to the image processing apparatus 3. For example, the display characteristic is measured using the measuring means 42 not connected online with the image processing apparatus 3, and the result is input via an input means such as a keyboard. Then, it may be input to the image processing apparatus 3.
  • the image processing devices 3a, 3b, and 3c include a control unit 31 and a storage unit 32 (a storage unit 32a in the image processing device 3a, a storage unit 32b in the image processing device 3b, and an image) that are configured by a CPU (Central Processing Unit) (not shown).
  • the processing device 3c is a computer that includes a storage unit 32c) and a RAM (Random Access Memory) (not shown).
  • the image processing apparatuses 3a, 3b, and 3c include a communication unit, an interface, an input unit, and the like (all not shown).
  • the communication unit is configured by a network interface or the like connected to an external device such as the medical diagnostic apparatuses 2a, 2b, 2c, and 2d via the network 5.
  • two image display devices 4, 4... are connected to the image processing devices 3a, 3b, 3c, respectively, via an interface.
  • the input unit is configured with a keyboard, a mouse, and the like, and a user can input various information.
  • the storage units 32a, 32b, and 32c are configured by an HDD (Hard Disk Drive) or the like.
  • the storage unit 32a of the image processing apparatus 3a includes a program storage unit 33, an image characteristic LUT storage unit 34, a display characteristic LUT storage unit 36, a default value storage unit 38, and a quality control data storage. It consists of part 39 etc.
  • the storage unit 32b of the image processing device 3b (PC2) and the storage unit 32c of the image processing device 3c (PC3) are configured from a program storage unit (not shown) that stores various programs. Programs and data necessary for performing basic operations such as determining the image type of the images sent to the image processing apparatuses 3b and 3c, and reading programs and LUTs necessary for processing from the storage destination Etc. are stored.
  • a quality management program 33a necessary for performing calibration processing which will be described later
  • an image processing program 33b necessary for performing image processing are a program storage unit of the storage unit 32a of the image processing apparatus 3a (PC1).
  • 33, and the LUT and data necessary for these processes are stored in the image characteristic LUT storage unit 34, the display characteristic LUT storage unit 36, the quality control data storage unit 39, etc. of the storage unit 32a.
  • the storage unit 32b of the image processing apparatus 3b (PC2) and the storage unit 32c of the image processing apparatus 3c (PC3) read out these programs, necessary LUTs, data, and the like from the storage unit 32a that is a storage destination as appropriate. Is remembered.
  • the program storage unit 33 is a program storage unit that stores an application program or the like for processing images obtained from the medical diagnostic apparatuses 2, 2.
  • a quality management program 33a and a medical diagnostic apparatus 2 for performing calibration according to the display characteristics of the image display devices 4, 4,... 2 stores an image processing program 33b for performing image processing on the image data generated by.
  • the image processing program 33b stores, in a display characteristic LUT storage unit 36, which will be described later, the types of image display devices 4, 4... Among the plurality of display characteristic LUTs 37 that are prepared and stored for each combination with the type of the image, and the types of the image display devices 4, 4...
  • the display characteristic LUT selection function for selecting the display characteristic LUT 37 used for image processing in accordance with the image characteristic LUT 35 corresponding to the image characteristic caused by the medical diagnostic apparatuses 2a, 2b, 2c, and 2d as the image data input source and the selected image characteristic LUT 35
  • the program storage unit 33 performs other basic operations such as determining the image type of an image sent to the image processing apparatus 3a and reading a program and data necessary for processing.
  • a program (not shown) is stored.
  • the image characteristic LUT storage unit 34 is connected to the network 5 and has a plurality of images corresponding to medical diagnostic devices (medical diagnostic devices that are candidate image data input sources) that may input image data via the network 5.
  • Image characteristic lookup table storage means for storing a characteristic lookup table hereinafter referred to as “image characteristic LUT”.
  • the image characteristic LUT storage unit 34 includes four types of image characteristic LUTs 35a, 35b, 35c, and 35d corresponding to the medical diagnostic apparatuses 2a, 2b, 2c, and 2d connected to the network 5 (see FIG. 3). ) Is stored.
  • the image characteristic LUTs 35a, 35b, 35c, and 35d stored in the image characteristic LUT storage unit 34 are not limited to these four types. If the types of medical diagnostic apparatuses 2a, 2b, 2c, and 2d connected to the network 5 increase, the image characteristic LUT corresponding to the type is stored in the image characteristic LUT storage unit 34.
  • the image characteristic LUT is not limited to the one according to the image type caused by the medical diagnostic apparatuses 2a, 2b, 2c, and 2d, and may be prepared according to the characteristic caused by the application program or the system of another company. .
  • the image characteristic LUT 35a corresponds to the image data of the CR image generated by the CR 2a. Since the polarity of the image data of the CR image is negative (the higher the data value, the lower the luminance, that is, the higher the density), the image data of the CR image is converted by the image characteristic LUT 35a, and negative / positive linear inversion is performed.
  • the image characteristic LUT 35b corresponds to the image data of the CT image generated by the CT 2b
  • the image characteristic LUT 35c corresponds to the image data of the MRI image generated by the MRI 2c
  • the image characteristic LUT 35d is determined by the endoscope 2d. Each corresponds to the image data of the generated endoscopic image.
  • the image characteristics LUTs 35b, 35c, and 35d are selectively applied depending on whether the image data sent to the image processing apparatuses 3, 3... Is a CT image, an MRI image, or an endoscopic image.
  • the tone correction is performed to optimize the tone so as to match the image characteristics of each medical diagnostic apparatus 2, 2,.
  • the display characteristic LUT storage unit 36 is connected to any one of the image processing devices 3, 3... Connected to the network 5, and is an image display device 4 that is an output target candidate that may output and display an image based on the image data. , 4... And a display characteristic look-up table (hereinafter referred to as “display characteristic LUT”) for each combination of the types of medical diagnostic apparatuses 2a, 2b, 2c, and 2d that are image data input source candidates. This is characteristic lookup table storage means.
  • the display characteristic LUT storage unit 36 includes a plurality of display characteristics LUTs 37 and 37 according to the display characteristics caused by the inherent gradation of the image display apparatuses 4, 4... And the image types caused by the medical diagnostic apparatuses 2, 2. I remember ...
  • the display characteristics LUTs 37, 37... are images suitable for the display characteristics resulting from the inherent gradation of the image display devices 4, 4... And the image types resulting from the medical diagnostic devices 2, 2. It is an LUT for performing gradation correction processing for conversion. A plurality of display characteristics LUTs 37, 37... Are provided corresponding to the image types resulting from the image display devices 4, 4,.
  • various image processing such as window processing, level adjustment, gradation processing for giving S-shaped gradation characteristics, frequency enhancement processing, dynamic range compression processing, and the like are performed on image data of medical images.
  • image processing may also be performed according to the image type of the image data, but the gradation correction processing in this embodiment is a process that takes into account the display characteristics of the image display devices 4, 4.
  • the image processing is performed according to the above, and is different from the image processing generally performed. Note that it is more preferable to perform the gradation correction processing in the present embodiment after performing the image processing that is generally performed.
  • FIG. 5 shows the display characteristics originally provided in the liquid crystal panel 41 of the image display devices 4, 4,...
  • display luminance vertical axis
  • horizontal axes are R, G, B single colors constituting the color image data
  • R, G, B values RGB values
  • each image data is image data such as image data generated by various types of medical diagnostic apparatuses 2, 2... And electronic medical records, and preferable display gradation characteristics for each image data are different. For this reason, in order to convert these image data into display image data suitable for display on the liquid crystal panel 41, a display in which gradation conversion is performed so as to have gradation characteristics according to the image type of each image data. It is necessary to perform gradation processing.
  • the storage unit 32a has six types of display characteristics LUTs 37a, 37 corresponding to the image types of the image data as display characteristics LUTs 37, 37...
  • display characteristics LUTs 37, 37 For performing display gradation processing performed by the control unit 31.
  • 37b, 37c, 37d, 37e, and 37f are stored.
  • the display characteristics LUTs 37a to 37f will be described.
  • image types of image data suitable for displaying with such gradation characteristics for example, color images such as endoscopic images and fundus photographic images can be cited.
  • a display characteristic LUT 37b (LUT2; “LUT1-1-2” in FIG. 19 described later) is a display gradation for performing gradation conversion for reducing the brightness of a display image when displayed on the liquid crystal panel 41. This is applied when processing is performed.
  • the display characteristic LUT 37b is a linear LUT in which the output signal value is proportional to the input signal value and the gradation display function is a linear function, as in the display characteristic LUT 37a.
  • the slope of the straight line is smaller than that of the display characteristic LUT 37a.
  • An image type of image data suitable for display with such gradation characteristics is a white background as a whole, such as image data of an electronic medical record, and text data is included therein.
  • Images that is, when displayed with a gradation characteristic of ⁇ 2.2 which is a characteristic of a general monitor (liquid crystal panel), it is displayed with a luminance of 300 cd / m 2 or the like. In such a case, if the display is performed with such high brightness, the visibility is dull and poor.
  • the visibility of an image such as an electronic medical record is further reduced when displayed together.
  • the electronic medical chart image data or the like is displayed with high luminance, the visibility of the image based on the image data by the image generation devices 2, 2.
  • an LUT having a smaller inclination than the display characteristic LUT 37a is used so as to lower the luminance of the display image such as an electronic medical record.
  • image type of image data suitable for displaying with such gradation characteristics for example, a color ultrasonic image or the like can be cited. Further, there are cases where CT images and MRI images are displayed with pseudo colors, which is also suitable for such pseudo color images.
  • a display characteristic LUT 37d (LUT4; referred to as “LUT1-1-3” in FIG. 19 to be described later) converts monochrome 8-bit image data according to a certain gray scale function, and outputs the converted output signal.
  • the present invention is applied when performing display gradation processing for performing gradation conversion so that monochrome display image data with values equal to R, G, B, etc. is obtained.
  • the gradation curve is converted into Although only one curve is displayed in FIG. 7, after the display gradation conversion, display image data having the same values for R, G, and B is generated for monochrome image data. Needless to say.
  • Examples of image types of image data suitable for displaying with such gradation characteristics include monochrome ultrasonic images, PET images, CT images, MRI images, and the like.
  • the display characteristic LUT 37e (LUT5; “LUT1-1-4” in FIG. 19 to be described later) is a monochrome 12-bit image data (input signal value is a numerical value from 0 to 4095).
  • the display gradation processing is performed so that the output signal value after conversion becomes display image data having 8-bit values of R, G, B, and the like.
  • the gradation curve is converted into
  • image type of image data suitable for displaying with such gradation characteristics for example, a monochrome CR image or the like can be cited.
  • the display characteristic LUT37f (LUT6) is an output signal value after conversion in which R, G, and B are unequal when the image data is monochrome 12-bit image data (when the input signal value is up to 4095). This is applied when display gradation processing is performed so as to obtain 8-bit display image data including a combination of the above.
  • the gradation display function of the display characteristic LUT 37f is a gradation curve according to the DICOM standard. Although it appears that only one curve is shown in FIG. 9, the values of R, G, and B after conversion for monochrome 12-bit image data are not necessarily the same.
  • FIG. 10 is an enlarged view of a portion surrounded by a one-dot chain line in the graph of FIG. As shown in FIG. 10, in the display characteristic LUT 37f, gradation conversion is performed by shifting R, G, and B values.
  • the input signal value is monochrome multi-gradation image data with 10 bits or more
  • the DICOM conversion is performed by simply reducing the output signal value to 8 bits as in the display characteristic LUT 37e
  • the number of gradations is reduced.
  • the monochrome signal having an input signal value of 10 bits or more is used. Even if the gradation image data is converted into an 8-bit output signal value, the number of gradations can be increased.
  • the display characteristic LUT 37e and the display characteristic LUT 37f are both monochromatic image data of 1 channel is input as image data, the data is distributed to 3 channels of R, G, and B, and 8 bits of R, G, and B are distributed. This is converted into B color display image data.
  • the display characteristic LUT 37e and the display characteristic LUT 37f are associated with preset correspondence when the image data is monochrome image data exceeding n (n is a positive integer of 8 or more) bits. Based on this, it is converted to n-bit R, G, B color display image data.
  • the liquid crystal panel 41 that is an image display means displays an image in three colors of R, G, and B
  • the display characteristic LUT 37e and the display characteristic LUT 37f are three of R, G, and B.
  • the display image data is converted into color display image data of the channel.
  • the image data of the number of channels corresponding to the number of display colors that is, (Color display image data of 3 channels or more) may be converted.
  • the display characteristic LUT 37e and the display characteristic LUT 37f are applied when the original image is 12-bit monochrome image data.
  • one-channel monochrome image data is displayed in three or more channels in color.
  • the display characteristic LUT 37 to be converted into image data is 1-channel monochrome image data whose image data is n (n is a positive integer greater than or equal to 8) bits, and this is converted into 3 channels of n bits based on preset correspondence. What is necessary is just to convert into the above color display image data, and is not limited to what was shown here.
  • FIG. 11 shows an example of converting 10-bit 1-channel monochrome image data into 8-bit 3-channel or more color display image data based on preset correspondence.
  • FIG. 11A shows the correspondence between monochrome image data and R, G, and B display image data after conversion when R, G, and B are converted as equivalent values, similarly to the display characteristic LUT 37e.
  • FIG. 11B shows correspondence between monochrome image data and R, G, and B display image data after conversion when R, G, and B are converted as unequal values, similarly to the display characteristic LUT 37f. It shows the date.
  • FIG. 12 shows RGB values for each gradation control unit (1 pixel).
  • FIG. 13 shows an example of creating a display characteristic UT37 when converting 1-channel multi-gradation image data with an input signal value of 12 bits into 8-bit 3-channel multi-gradation image data, which is display image data. Show.
  • one-channel multi-gradation image data (“multi-gradation 1” in FIG. 13) having an input signal value of 12 bits can be prepared on the image display device 4, 4.
  • This figure shows the correspondence between signal values when converting to multi-gradation image data (“multi-gradation 2” in FIG. 13) according to the number of gradations.
  • the multi-gradation 2 after conversion may be 8 bits (256 gradations) or more, and is not particularly limited, but is preferably 10 bits (1024 gradations) or more.
  • FIG. 14 is a graph showing an LUT for converting from a 12-bit multi-gradation 1 having a signal value up to 4095 to a 10.8-bit multi-gradation 2 having a signal value of 1785.
  • FIG. 13B shows the converted multi-gradation image data (“multi-gradation 2” in FIG. 13) shown in FIG. 13A and the display gradation characteristics of the image display devices 4, 4,.
  • FIG. 5 shows the correspondence between signal values and predetermined unequal 8-bit 3-channel multi-gradation image data (fixed LUT).
  • FIG. 13C shows image data (multi-gradation 1) having an input signal value of 4095 by applying the above fixed LUT to an 8-bit, 3-channel multi-channel having unequal R, G, and B values. The correspondence relationship of each image signal in the case of converting to gradation image data is shown.
  • a fixed LUT (see FIG. 13B) used for realizing multi-gradation was created as follows. Note that the method of creating the fixed LUT is not limited to the one exemplified here.
  • values obtained by adding six predetermined offset values as shown in FIG. 15B to the values of R, G, and B are used together.
  • the offset value corresponding to G is the most significant
  • the offset value corresponding to R is the middle
  • the offset value corresponding to B is the least significant. It is preferable to add a combination offset value (FIG. 16B) of binary numbers 001 to 110 (1 to 6 in decimal numbers) so that the binary numbers monotonically increase.
  • the offset value corresponding to G is a 2 bit of 2 bits of a 3-bit binary number
  • the offset value corresponding to R is a 1 bit of 2 of a 3 bit binary number.
  • the offset value corresponding to the place and B corresponds to the 2 to the 0th power of a 3-bit binary number.
  • the fixed LUT created by the above method is created based on a very simple regularity, but within the range where RL, GL, and BL satisfy Expression (1), the model difference, the solid difference, and the change with time Even if there is, it is preferable because the monotonous increase in display luminance can be maintained.
  • the ratios of R, G, and B single-color luminances RL, GL, and BL have a relationship represented by the following formula (2).
  • the luminance value (signal value) of R and the luminance value (signal value) corresponding to the input data are distributed to the RGB cells constituting the unit pixel, respectively.
  • And B as the sum of luminance values (signal values), and only 768 different combinations of RGB can be obtained at the maximum, and a sufficient number of gradations cannot be obtained.
  • the conventional method does not define the order in which the respective RGB values are increased so that the binary offset value increases monotonically. Therefore, there is a problem that the luminance does not increase monotonously depending on the allocation method.
  • the fixed LUT described above adds an offset based on a combination of equal values of R, G, and B, so the image is displayed in a nearly black and white color tone, but it is also possible to add some color to the image. It is.
  • a method for creating a fixed LUT for displaying in a bluish color tone will be described.
  • FIG. 17A is the same as the fixed LUT shown in the center of FIG. 15C, and the fixed LUT in FIG. 15C shows up to 21 as monochrome input values.
  • FIG. 17A shows up to 1785 as monochrome input values.
  • FIG. 17B is based on the value of the fixed LUT in FIG. 17A, the value corresponding to B is left unchanged, the value corresponding to R is rounded by multiplying by 231/255, and the value corresponding to G Multiplied by 243/255 and rounded off.
  • the fixed LUT of FIG. 17B is used, the value corresponding to R and G is smaller than the value corresponding to B, and the value of B is relatively large, so that it is possible to display in a bluish color tone. it can.
  • an LUT with smoother gradation can be obtained by the following method.
  • FIG. 18A shows the luminance ratio of R, G, and B of a typical color liquid crystal panel (in this example, 0.26: 0.65: 0...)
  • the result of calculating the sum by multiplying (09) is shown.
  • This sum is a value obtained by estimating the magnitude relationship of the displayed luminance.
  • the sum (luminance) does not increase monotonously with respect to the combination of R, G, and B (see A1 in FIG. 18A) where the sum (luminance) increases monotonously.
  • a combination of R, G, and B may occur. Therefore, as shown in FIG.
  • the storage unit 32 has, for example, a medical information type indicating what kind of medical diagnosis device 2, 2...
  • the image data is generated, and a color indicating whether it is a color image or a monochrome image.
  • Type (note that the medical information type and color type are collectively referred to as “image type”), information about the type of image such as the number of gradations of the image, and the type of display characteristic LUT used for display gradation processing Is stored.
  • FIG. 19 shows an example of LUT association information.
  • the display characteristic LUT storage unit 36 uses the LUT 1-1-1 as the display characteristic LUT 37 used when displaying an image on the image display apparatus 4a (Display 1-1) connected to the image processing apparatus 3a (PC1).
  • LUT1-1-2, LUT1-1-3,... are stored, as shown in FIG. 19, the LUT association information indicates what image type and the like each display characteristic LUT 37 corresponds to. Showing the relationship.
  • the medical information type is an electronic medical record
  • the color type is color
  • an image display device 4a (Display1) connected to the image processing device 3a (PC1) is an 8-bit gradation image.
  • -1) is associated with LUT1-1-2 (display characteristic LUT37b) as a display characteristic LUT37 to be applied to display
  • the medical information type is a CR image
  • the color type is monochrome
  • the number of gradations is LUT1-1-4 (display characteristic LUT37e) is associated with display characteristic LUT37 applied when displaying a 12-bit image on image display apparatus 4a (Display1-1) connected to image processing apparatus 3a (PC1). It has been.
  • control unit 31 selects a display characteristic LUT 37 to be used for image processing based on the LUT association information, and applies the selected display characteristic LUT 37 to perform image processing of image data. Yes.
  • the information related to the image associated with the display characteristic LUT 37 used for image processing is not limited to the information exemplified here.
  • the association between the information regarding the type of image and the display characteristic LUT 37 may be appropriately set by an input by a user or the like, or a preferable association may be set in advance as a default. Even if the association is set as a default in advance, the correspondence between the information related to the image type and the display characteristic LUT 37 can be changed afterwards by input and setting by the user or the like. . In this case, the LUT association information is rewritten by input / setting by the user or the like.
  • the default value storage unit 38 stores a default value when the display characteristic LUT 37 is created.
  • the user may select to generate the display characteristic LUT using default values determined in advance for each model and for each manufacturer without using the actual measurement values of the image display devices 4, 4. It can be done.
  • the display characteristic LUT (“default LUT” in FIG. 20) is created with default values
  • the created LUT is stored in the display characteristic LUT storage unit 36 as one of the candidates that can be selected as the display characteristic LUT 37. It has become.
  • FIG. 20 shows an example of the display characteristic LUT 37 created using default values.
  • the display characteristic LUT 37 created using default values is different from each image display device 4, 4... By manufacturer, model, or monochrome image or color image. , 4..., 4...
  • gradation characteristic test data 39a gradation characteristic test data 39a
  • calibration measurement data 39b calibration measurement data 39b
  • Data (not shown) and the like are stored.
  • the gradation characteristic test data 39a includes inspection data obtained by the gradation characteristic test (measured luminance value with respect to the RGB value of the test pattern), standard data to be compared with the inspection data (standards specified in JESRA, AAPM, etc.). (Luminance value) and the result of comparing and comparing the inspection data with the standard data.
  • the calibration measurement data 39b refers to the RGB value of the test pattern obtained as a result of displaying the test pattern on the liquid crystal panel 41 of the image display device 4, 4. It is data of measured luminance values.
  • the test pattern data is a plurality of solid image data (RGB values) for displaying the test pattern on the liquid crystal panel 41.
  • RGB values solid image data
  • all or a part of 256 kinds of combinations having equal RGB values are used as data for displaying the test pattern.
  • the RGB values for displaying the test pattern are as follows. It does not have to be equal.
  • control unit 31 in this embodiment will be described.
  • the control unit 31 is composed of a CPU (Central Processing Unit) (not shown) and the like, and expands a system program read from the storage unit 32 and programs, data, and the like designated from various application programs in a RAM work area. Various processes are executed in cooperation with the program expanded in the RAM.
  • CPU Central Processing Unit
  • the control unit 31 of the image processing devices 3a to 3d performs image display control of the image display devices 4, 4..., For example, when performing a gradation characteristic test, the liquid crystal panel 41 of the image display devices 4, 4. The data of the test pattern to be displayed is output to the image display devices 4, 4.
  • control unit 31 of the image processing apparatuses 3a to 3d performs quality management processing (calibration) in cooperation with the quality management program 33a. Specifically, the control unit 31 displays a test pattern on the liquid crystal panel 41 of the image display device 4, 4..., And causes the measurement unit 7 to measure the color stimulus value XYZ at that time. The measurement result by the measuring means 7 is input to the control unit 31.
  • the value represented by Y among the color stimulus values represents luminance.
  • the control unit 31 Based on the measured luminance value for the RGB value of the test pattern obtained by this measurement and the standard luminance value defined in JESRA, AAPM, etc., the control unit 31 performs monochromatic monochrome for one channel according to the display characteristics of the liquid crystal panel 41.
  • a display characteristic LUT 37 is created as a conversion rule for converting into RGB values of three channels based on the image signal value.
  • medical diagnostic apparatuses 2a to 2d are connected to the image processing apparatuses 3a to 3d via a network interface (not shown), and the control unit 31 is connected to the medical diagnostic apparatuses 2a to 2d.
  • image data such as image data of generated medical images and image data of electronic medical records are acquired.
  • the control unit 31 of the image processing apparatuses 3a to 3d cooperates with the image processing program 33b to display an image based on the image data obtained from the medical diagnosis apparatuses 2a to 2d in a state suitable for each of the image display apparatuses 4, 4,. Perform image processing for display.
  • control unit 31 when image data is input from the medical diagnostic apparatuses 2a to 2d, the control unit 31 first determines the type of the medical diagnostic apparatuses 2a to 2d that are input image data.
  • Each image data includes, as supplementary information (header information of the image data), information related to the image type such as medical information type and color information, the number of bits per pixel, the number of bytes per pixel, and the number of pixels in the vertical direction of the image Various information such as the number of pixels in the horizontal direction of the image is attached, and the control unit 31 determines the image type of each image based on the accompanying information attached to the image data.
  • head information of the image data includes, as supplementary information (header information of the image data), information related to the image type such as medical information type and color information, the number of bits per pixel, the number of bytes per pixel, and the number of pixels in the vertical direction of the image
  • the control unit 31 determines the image type of each image based on the accompanying information attached to the image data.
  • the storage of medical image image data is performed in accordance with the DICOM standard, which is a standard related to the distribution of medical images, the storage format of medical images, and the like.
  • the image is stored in the header area of the image data.
  • image data can be exchanged between different apparatuses.
  • the method for attaching the auxiliary information to the image data is not particularly limited. If the image data is not stored in the storage format of the DICOM standard, necessary information is input from an input unit (not shown). Or a method of attaching necessary supplementary information by reading a barcode or the like.
  • the control unit 31 selects an image from the image characteristic LUT storage unit 34 according to the image characteristic resulting from the type of the medical diagnostic apparatus 2a to 2d.
  • An image characteristic LUT 35 suitable for use in processing is selected.
  • the control unit 31 determines the type of the image display devices 4, 4... To be output and the type of the medical diagnosis devices 2 a to 2 d that are the input source of the image data. From this, a display characteristic LUT 37 suitable for use in image processing is selected.
  • the image data input from the medical diagnostic apparatuses 2a to 2d is subjected to correction (image processing) according to the image characteristics by applying the image characteristic LUT 35, and further this correction (image processing) is performed.
  • the display characteristic LUT 37 is applied to the image data to perform correction (image processing) according to the display characteristic.
  • application programs such as the quality management program 33a and the image processing program 33b, various LUTs, data, and the like are stored in the storage unit 32a of the image processing apparatus 3a.
  • the control unit 31 of the image processing apparatuses 3b, 3c, and 3d transmits an application program (quality management program 33a, image processing program 33b, etc.) necessary for the processing to perform the quality management process and the image processing.
  • the LUT and various data necessary for various processes are read from the storage unit 32a of the image processing apparatus 3a (see FIG. 2).
  • the control unit 31 of the image processing apparatuses 3b, 3c, and 3d creates the display characteristic LUT 37 as a result of the quality management process
  • the display characteristic LUT 37 is transmitted to the image processing apparatus 3a, and the control unit of the image processing apparatus 3a. 31 is stored in the display characteristic LUT storage unit 36 of the storage unit 32a.
  • the control unit 31 Creates a display characteristic LUT 37 based on the default value stored in the default value storage unit 38 and stores it in the display characteristic LUT storage unit 36 of the storage unit 32a.
  • the control unit 31 of the image processing apparatuses 3a to 3d divides one display screen of the liquid crystal panel 41 of the image display apparatuses 4, 4,... Into a plurality of display areas, and is different for each display area. Multiple image display processing for displaying various types of images is performed. For example, one screen can be divided into three display areas, and images of different image types such as an endoscopic image, an electronic medical record image, and a CT image can be displayed in each area (see FIG. 21). In this case, how many screens are divided, what kind of image is displayed at which position, which area is set to what size, etc. may be determined by default, Etc. may be set arbitrarily.
  • control unit 31 may not have a function of performing such a process.
  • quality control (calibration) processing is performed as follows. This calibration process is realized by the cooperation of the control unit 31 and the quality management program 33a of the image processing apparatuses 3, 3,.
  • the quality control process includes a gradation characteristic test process for determining whether or not the display characteristics of the test patterns displayed on the image display devices 4, 4... Are measured, and the display characteristics of the test patterns are measured with a predetermined number of calibration points. And a calibration process for performing calibration.
  • the image display screen 41a displayed on the image display devices 4, 4,... Has gradation characteristics as well as operation buttons 411 for rotating, enlarging, and reducing images as shown in FIG.
  • a quality control processing button 412 for performing a test and calibration is provided.
  • the quality management screen 41b includes a gradation characteristic test button 413 for starting a gradation characteristic test, a calibration button 414 for performing calibration, a history display button 415 for displaying a history of quality management processing, and a quality management process.
  • An end button 416 for ending is provided. Then, when the user selects the gradation characteristic test button 413 on the quality management screen 41b, an instruction to start the gradation characteristic test process is input to the control unit 31, and the gradation characteristic test is started.
  • the control unit 31 has different signal values (display luminance) in the test pattern in accordance with regulations such as JESRA and AAPM.
  • a type of test pattern is selected, read out, and output to the image display device 4.
  • the test pattern is displayed on the liquid crystal panel 41 (step S1).
  • the measuring means 7 measures the display light of the liquid crystal panel 41 (step S2).
  • Information about luminance and / or chromaticity, which is a measurement result of the display light, is input from the measuring unit 7 to the control unit 31.
  • the control unit 31 always determines whether or not the measurement has been performed with a predetermined number of points (for example, 18 points) (step S3). If the number of measurement points has not reached the predetermined number (step S3; NO), the number of measurement points is determined. Steps S1 to S2 are repeated until the predetermined number of points is reached.
  • the control unit 31 reads the measurement luminance input from the measurement unit 7 and reads the fixed LUT stored in the storage unit 32a of the image processing device 3a.
  • the fixed LUT is applied to perform signal conversion for converting the measured gradation level value and luminance into a standard gradation level value.
  • the control unit 31 calculates GSDF (standard gray scale function) defined in DICOM Part 14 based on the maximum luminance and the minimum luminance, and obtains standard luminance data for each signal value. Then, the contrast response value calculated based on the standard data defined in JESRA, AAPM, etc. is compared with the contrast response value calculated based on the measurement data, and the maximum absolute value of the deviation is calculated. Obtain (step; S4).
  • GSDF standard gray scale function
  • a calibrated luminometer and the TG18-LN test pattern (or a correlated luminometer and alternative pattern) are used to test for 18 digital drive levels. Measure the brightness in the area. The measured luminance value (L) is converted into a JND index (J) by the following general formula (4).
  • FIG. 24 is an example in which the contrast response ( ⁇ L / L per JND in the figure) is obtained by converting into a JND index based on the measured luminance value and the standard luminance value.
  • the “deviation” in FIG. 24A represents the deviation of the contrast response in FIG. 24A as a percentage with respect to the contrast response in FIG.
  • the above equation (4) specifically shows the calculation of the contrast response.
  • the calculated contrast response must be within ⁇ 15% of the standard value for grade 1 monitors at all measurement points, and the grade 2 monitor must also be within ⁇ 30%.
  • the control unit 31 After obtaining the maximum absolute value of the obtained deviation, the control unit 31 makes a pass / fail judgment based on the maximum absolute value of the deviation (step S5).
  • the determination criterion for pass / fail judgment is “pass” when the measurement data is included in the standard data, and “fail” when the measurement data is not included in the standard data.
  • the control unit 31 causes the liquid crystal panel 4 to display the pass / fail result determined in this way and the absolute value of the maximum deviation (step S6). In the case of failure, a warning sound or display prompting calibration may be performed.
  • FIG. 25 shows an example of a gradation test result screen 41c displaying the result of the gradation characteristic test.
  • the gradation test result screen 41c includes a condition information column 417 indicating conditions of the gradation characteristic test, a determination column 418 indicating determination of pass / fail determination, and the number of points where the measurement was performed (this embodiment In this case, there are provided a measurement result column 419 representing the luminance for each of the predetermined points, a result display column 420 representing the result of the gradation characteristic test in a graph, a contrast response display column 421 representing the result of the contrast response, and the like.
  • the contrast response display column 421 is a graph in which the contrast response shown in FIG. 24 is plotted on the vertical axis and the JND index is plotted on the horizontal axis.
  • the configuration of the gradation test result screen 41c is not limited to the one shown here.
  • the user operates the calibration button 414 (see FIG. 22) on the quality management screen 41b with a mouse or the like and selects it in accordance with a warning for prompting calibration or the like after a certain period of time, etc.
  • An instruction to start the calibration process is input to the control unit 31, and the calibration process is started.
  • control unit 31 When an instruction to start the calibration process is input, as shown in FIG. 26, the control unit 31 reads out image data of a predetermined number of test patterns and outputs a signal by a correction LUT set in advance based on DICOM calibration. The image is converted and output to the image display device 4. When the test pattern is output, the test pattern is displayed on the liquid crystal panel 41 (step S11).
  • the measuring means 7 measures the display light of the liquid crystal panel 41 (step S12).
  • Information on luminance and / or chromaticity, which is a measurement result of display light, is input from the measuring unit 7 to the control unit 31.
  • the control unit 31 always determines whether or not the above data conversion has been performed for a predetermined number of points (step S13). If the number of measurement points has not reached the predetermined number of points (step S13; NO), the number of measurement points is the predetermined number of points. The above process is repeated until the value reaches.
  • the control unit 31 reads the measurement luminance value, converts the signal value by a fixed LUT, and sets the standard luminance.
  • the control unit 31 displays the display characteristic LUT 37 (FIG. 6) so that the display luminance by the liquid crystal panel 41 is appropriate according to the image data based on the test pattern image data and the standard luminance. (See FIG. 9) is created (step S14).
  • the created display characteristic LUT 37 is stored in the display characteristic LUT storage unit 36 of the storage unit 32a of the image processing apparatus 3a (step S15).
  • a calibration result screen 41d as shown in FIG. 27 is displayed.
  • the calibration result screen 41d includes a condition information field 422 indicating calibration conditions, a luminance display field 423 indicating measurement results, a gradation number display field 424 indicating the number of gradations of the LUT, and a display.
  • An application result display column 425 that represents a luminance measurement result in a state where the characteristic LUT is not applied in a graph, an LUT display column 426 that indicates a display characteristic LUT 37 that is applied to the signal, and the like are provided.
  • the configuration of the calibration result screen 41c is not limited to that shown here.
  • the display characteristic LUT 37 for calibration can be obtained by associating a curve based on the measured value of the test pattern with a curve based on the standard value. Specifically, as indicated by an arrow in FIG. 28, the gradation level value based on the actually measured value is set in accordance with the GSDF (standard data) which gradation is output according to the value.
  • GSDF standard data
  • the gradation characteristic test process for automatically performing the gradation characteristic test is set to be performed, and the processes from S1 to S5 (see FIG. 23) are repeated. This is preferable because a more accurate display characteristic LUT 37 can be obtained.
  • LUT 37 can be obtained.
  • control unit 31 expands the image processing program 33b stored in the program storage unit 32a in the work area of the RAM, and the control unit 31 cooperates with the image processing program 33b. It is realized.
  • control unit 31 determines an image type of each image data based on incidental information attached to the image data (Ste S22).
  • control unit 31 refers to LUT association information (not shown) and selects an image characteristic LUT 35 corresponding to the image type of the image data according to the image type of the image data. (Step S23). Then, the controller 31 applies the image characteristic LUT 35 to correct the image characteristic of the image data (step S24).
  • control unit 31 selects the display characteristic LUT 37 according to the type of the image display device 3 to be output and the image type of the image data (step S25). Then, the control unit 31 applies the selected display characteristic LUT 37 to correct the display characteristic for the image data (step S26). When the correction is completed, the control unit 31 outputs the image data after the image processing to the image display device 4 and causes the liquid crystal panel 41 to display the image data.
  • the quality management program 33a, the image processing program 33b, various LUTs, data, and the like are stored in the storage unit 32a of one image processing apparatus 3a, and the quality is read by appropriately reading them. Since the management processing and the image processing are performed, the image processing can be easily performed without using an expensive image display device 4, 4.
  • the LUT to be changed can be reduced when the display characteristic changes over time, and the processing complexity can be avoided.
  • an image characteristic LUT 35 and a display characteristic LUT 37 are selected so that an image based on image data of different image types is suitable for the display characteristics of the image display devices 4, 4,.
  • images with display gradation characteristics that match each image type are displayed. Can be made.
  • a plurality of images can be observed at the same time with a high gradation display suitable for diagnosis, and text information such as electronic medical record information can be displayed at a gradation with good visibility and can be referenced simultaneously. More appropriate diagnosis can be made.
  • image processing is performed by applying the image characteristic LUT 35 to the image data, and further, the display characteristic LUT 37 is applied to the image data after the image processing.
  • the image processing procedure is not limited to this.
  • control unit 31 After selecting the image characteristic LUT 35 and the display characteristic LUT 37, the control unit 31 combines the LUTs 35 and 37 to create a combined LUT and applies the combined LUT to the image data. Both image characteristics and display characteristics may be corrected.
  • the quality control processing method in the quality control process, first, a gradation characteristic test process is performed, and calibration is performed only when an instruction to perform calibration is given due to a warning or the like so that calibration is performed.
  • the quality control processing method is not limited to this.
  • the control unit 31 After comparing the contrast response values calculated based on the standard data and the measurement data and obtaining the maximum absolute value of the deviation (step S34), the control unit 31 determines the display brightness by the liquid crystal panel 41 from this value. It is determined whether or not the image data is appropriate according to the image data (step S35). When the pass / fail judgment result is acceptable (step S35), the result is displayed (step S36), and the process is terminated.
  • step S35 when the pass / fail judgment is made and the result is unacceptable (step S35; No), the absolute value of the deviation and the result of the pass / fail judgment are displayed (step S37) and the calibration is automatically performed. An instruction to start is input.
  • the control unit 31 reads test pattern data and performs signal conversion based on a correction LUT set in advance by DICOM calibration.
  • the test pattern data converted into signals is output to the image display devices 4, 4...
  • the test pattern is displayed on the liquid crystal panel 41 (step S38).
  • the measuring means 7 measures the display light of the liquid crystal panel 41 (step S29). Information about luminance and / or chromaticity, which is a measurement result of the display light, is input from the measuring unit 7 to the control unit 31.
  • the control unit 31 always determines whether or not the above data conversion has been performed for a predetermined number of points (step S40). If the number of measurement points does not satisfy the predetermined number of points (step S40; NO), the control unit 31 continues until the measurement point satisfies the predetermined number of points. Repeat the process.
  • the control unit 31 reads the measurement luminance and converts it into a standard luminance by a fixed LUT. After converting the measured luminance into the standard luminance, the control unit 31 creates the display characteristic LUT 37 so that the display luminance by the liquid crystal panel 41 is appropriate according to the image data based on the test pattern image data and the standard luminance. This is performed (step S41).
  • the created display characteristic LUT 37 is stored in the display characteristic LUT storage unit 36 (step S42).
  • the maximum number of repetitions is determined in advance, and when the number of repetitions fails, the fact can be displayed on the liquid crystal panel 41 and the program can be terminated.
  • FIG. 31 shows the display characteristics originally provided in the liquid crystal panel of the image display device as display luminance (vertical axis) with respect to an 8-bit input signal value (horizontal axis).
  • the display luminance in the case of an input signal value of (image) is shown.
  • display characteristic LUTs 61a to 61f corresponding to the image type of the medical image data are stored as the display characteristic LUT 61 for performing display characteristic correction (image processing) performed by the control unit. Yes.
  • the display characteristics LUTs 61a to 61f will be described with reference to FIGS.
  • the relationship between the output signal value and the input signal value is a display characteristic according to the DICOM standard originally provided in the liquid crystal panel of the image display device.
  • the gradation curve is converted into a characteristic.
  • a display characteristic LUT 61c (hereinafter referred to as “LUT3 ′” in the drawing) is a level for converting color image data (R, G, B) into color display image data (R, G, B). This is applied when performing display gradation processing for tone conversion.
  • the display characteristic LUT 61d (hereinafter referred to as “LUT4 ′” in the drawing) converts monochrome image data according to a certain gray scale function, and the output signal value after conversion is R, G, B.
  • the present invention is applied when performing display gradation processing for performing gradation conversion so that monochrome display image data of equal value is obtained.
  • the display function of the gradation of the display characteristic LUT 61d is a straight line, and the display characteristic according to the DICOM standard originally provided in the liquid crystal panel of the image display device can be obtained. Although only one straight line is displayed in FIG. 32, display image data having the same values for R, G, and B for monochrome image data is generated after display gradation conversion. Needless to say.
  • the display characteristic LUT 61e (hereinafter referred to as “LUT5 ′” in the drawing) is a case where the image data is monochrome 12-bit image data (when the input signal value can take a value from 0 to 4095). ) Is applied when the display gradation processing is performed so that the output signal value after conversion becomes display image data having 8 bits of R, G, B, etc. As shown in FIG. 34, the gradation display function of the display characteristic LUT 61e is also a straight line, and the display characteristic according to the DICOM standard originally provided in the liquid crystal panel of the image display device can be obtained.
  • the display characteristic LUT 61f (hereinafter referred to as “LUT6 ′” in the drawing) is converted after the image data is monochrome 12-bit image data (when the input signal value is up to 4095). This is applied when display gradation processing is performed so that output signal values are 8-bit display image data including combinations of unequal values of R, G, and B.
  • the display function of the gradation of the display characteristic LUT 61f is a straight line, and the display characteristic according to the DICOM standard originally provided in the liquid crystal panel of the image display device can be obtained. Although it seems that only one curve is shown in FIG. 35, the values of R, G, and B after conversion for monochrome 12-bit image data are not necessarily the same as in the case of FIG. is there.
  • FIGS. 5 and 31, FIGS. 6 and 32, FIGS. 7 and 33, FIGS. 8 and 34, and FIGS. 9 and 35 correspond to the display characteristics according to the original display characteristics.
  • the shape of the LUT is different, the gradation characteristics of the image displayed as a result are the same regardless of the original display characteristics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • General Physics & Mathematics (AREA)
  • Biophysics (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Quality & Reliability (AREA)
  • Human Computer Interaction (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Image Processing (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)

Abstract

La présente invention concerne un système d'affichage d'images capable, lorsqu'une pluralité de types d'images médicales sont affichées sur un écran d'affichage, d'afficher les images sous forme d'images aptes pour le diagnostic selon des caractéristiques de gradation ou analogues des images respectives ainsi qu'un programme de traitement d'images. Le système d'affichage d'images est caractérisé en ce qu'il comporte une unité de stockage d'une table de conversion de caractéristiques d'affichage (36) permettant le stockage d'une table de conversion de caractéristiques d'affichage (37) de chaque combinaison du type d'un dispositif d'affichage d'images (4) et du type de dispositif de diagnostic médical (2), une unité de stockage de programmes (33) permettant le stockage d'un programme de traitement d'images (33b) comprenant l'étape de sélection de table de conversion de caractéristiques d'affichage souhaitée (37) à partir de l'unité de stockage de table de conversion de caractéristiques d'affichage sélectionnée (36) et l'application de la table de conversion de caractéristiques d'affichage sélectionnée (37) aux données d'image, et un dispositif de traitement d'images (33b) permettant le traitement des données d'image selon le programme de traitement d'images (33b) et l'affichage d'une image basée sur les données d'images à images traitées sur le dispositif d'affichage d'images (4).
PCT/JP2009/052651 2008-02-21 2009-02-17 Système d'affichage d'images et programme de traitement d'images WO2009104583A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008039833 2008-02-21
JP2008-039833 2008-02-21

Publications (1)

Publication Number Publication Date
WO2009104583A1 true WO2009104583A1 (fr) 2009-08-27

Family

ID=40985463

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/052651 WO2009104583A1 (fr) 2008-02-21 2009-02-17 Système d'affichage d'images et programme de traitement d'images

Country Status (1)

Country Link
WO (1) WO2009104583A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104873172A (zh) * 2015-05-11 2015-09-02 京东方科技集团股份有限公司 具有健康检测功能的装置及检测方法、显示装置、系统
CN109844814A (zh) * 2016-10-07 2019-06-04 株式会社Dds 信息处理程序和信息处理装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002125937A (ja) * 2000-10-24 2002-05-08 Toshiba Corp 画像処理装置
JP2003060893A (ja) * 2001-08-21 2003-02-28 Konica Corp 医用画像出力装置、医用画像処理システム、医用画像記録装置及び医用画像処理方法
JP2004236785A (ja) * 2003-02-05 2004-08-26 Fuji Photo Film Co Ltd 画像表示装置の品質管理システム
JP2008006191A (ja) * 2006-06-30 2008-01-17 Fujifilm Corp 画像処理装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002125937A (ja) * 2000-10-24 2002-05-08 Toshiba Corp 画像処理装置
JP2003060893A (ja) * 2001-08-21 2003-02-28 Konica Corp 医用画像出力装置、医用画像処理システム、医用画像記録装置及び医用画像処理方法
JP2004236785A (ja) * 2003-02-05 2004-08-26 Fuji Photo Film Co Ltd 画像表示装置の品質管理システム
JP2008006191A (ja) * 2006-06-30 2008-01-17 Fujifilm Corp 画像処理装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104873172A (zh) * 2015-05-11 2015-09-02 京东方科技集团股份有限公司 具有健康检测功能的装置及检测方法、显示装置、系统
US10485426B2 (en) 2015-05-11 2019-11-26 Boe Technology Group Co., Ltd. Device having health detecting function, display apparatus, system and health detecting method
CN109844814A (zh) * 2016-10-07 2019-06-04 株式会社Dds 信息处理程序和信息处理装置
CN109844814B (zh) * 2016-10-07 2022-12-06 株式会社Dds 信息处理方法和信息处理装置

Similar Documents

Publication Publication Date Title
JPWO2008015903A1 (ja) 画像表示方法及び画像表示装置
US7920145B2 (en) Image processing apparatus control method and image processing apparatus
US9280943B2 (en) Devices and methods for reducing artefacts in display devices by the use of overdrive
JPWO2008044437A1 (ja) 画像処理方法及び画像処理装置
KR100450503B1 (ko) 2차원 모노크롬 비트면 표시장치
WO2005050614A1 (fr) Procede de reglage de la luminance, afficheur a cristaux liquides, et programme informatique
WO2009104584A1 (fr) Système de contrôle de qualité et programme de contrôle de qualité de système d'affichage d'images
US6906727B2 (en) Method of reproducing a gray scale image in colors
US7209142B1 (en) Image display method and an image display apparatus for implementing the method
JP5227539B2 (ja) 出力値設定方法、出力値設定装置及び表示装置
WO2009104583A1 (fr) Système d'affichage d'images et programme de traitement d'images
JP2008175915A (ja) 表示画像検査方法、表示画像検査システム及び表示画像検査プログラム
US20080007574A1 (en) Image display method
JP2015066014A (ja) 画像処理装置及びプログラム並びに画像形成装置
JP5029022B2 (ja) キャリブレーション方法、キャリブレーションシステム及びキャリブレーションプログラム
JP2005070080A (ja) 階調補正方法およびプログラム
WO2007083556A1 (fr) Affichage d'image, procédé d'affichage d'image et programme d'affichage d'image
JP2008116561A (ja) 画像処理方法、画像表示装置及びプログラム
WO2015173948A1 (fr) Dispositif de correction d'image, dispositif d'affichage, et procédé de correction d'image
JP2004242143A (ja) マルチディスプレイシステム
JP2004245899A (ja) マルチディスプレイシステムの品質管理システム
WO2008044438A1 (fr) Procédé d'affichage d'image, programme d'affichage d'image et système d'affichage d'image
JP2008015044A (ja) 画像表示方法および画像表示装置
JP2022129407A (ja) 画像表示システム、サーバ装置及び画像表示方法
JP2003295851A (ja) 画像表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09712353

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09712353

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP