WO2010134481A1 - Medical image display device and medical image display method - Google Patents
Medical image display device and medical image display method Download PDFInfo
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- WO2010134481A1 WO2010134481A1 PCT/JP2010/058265 JP2010058265W WO2010134481A1 WO 2010134481 A1 WO2010134481 A1 WO 2010134481A1 JP 2010058265 W JP2010058265 W JP 2010058265W WO 2010134481 A1 WO2010134481 A1 WO 2010134481A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/08—Volume rendering
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/46—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
Definitions
- the present invention relates to a medical image display apparatus and a medical image display method for displaying a medical image obtained from a medical image diagnostic apparatus including an X-ray CT apparatus, an MRI apparatus, and an ultrasonic apparatus, and retains a pixel value acquired at the time of imaging.
- the present invention also relates to a technique for displaying a projection image having depth information.
- One of the three-dimensional image display methods for displaying a medical image obtained from a medical image diagnostic apparatus including an X-ray CT apparatus, an MRI apparatus, and an ultrasonic apparatus is a maximum value projection (MIP) method.
- the maximum value projection method is a method in which projection processing in an arbitrary direction is performed on 3D image data, and the maximum pixel value on the projection line is displayed on the projection plane.
- the image obtained by this method is an MIP image and be called.
- the MIP image holds a pixel value acquired at the time of shooting, for example, a CT value in the case of a CT image, but does not have depth information, so there is no perspective with the MIP image as it is.
- Patent Document 1 There is a method disclosed in Patent Document 1 as a method for obtaining a perspective MIP image.
- each of the three-dimensional image data is weighted with a plurality of weighting functions, and the maximum value projection processing is performed on the plurality of weighted three-dimensional image data. The maximum value projection results are added up.
- Patent Document 1 after the three-dimensional image data is weighted, a plurality of projection images obtained by performing the maximum value projection process on the weighted three-dimensional image data are added, so that finally obtained The obtained image does not hold a pixel value acquired at the time of imaging, for example, a CT value, and it is difficult for an interpreting doctor to make a diagnosis based on the CT value.
- the CT value which is a pixel value acquired at the time of imaging
- the density value which is a pixel value acquired at the time of imaging
- the CT value is extremely important information for knowing what state the part in the subject is.
- the density value which is a pixel value acquired at the time of imaging, is also important information for diagnosis, like the CT value.
- an object of the present invention is to provide a medical image display apparatus and a medical image display method for creating and displaying a projection image having depth information while retaining a pixel value acquired at the time of photographing.
- the present invention provides a projection image creation unit that creates a projection image by projecting a medical image obtained from a medical image diagnostic apparatus onto a projection surface, and a projection image display unit that displays the projection image.
- a projected image creating unit that extracts a pixel having a pixel value satisfying a predetermined threshold condition from pixels on a projection line; and When the pixel extraction unit cannot extract a pixel having a pixel value satisfying the threshold condition, an arbitrary pixel on the projection line is selected as a projection pixel, and the pixel value satisfies the threshold condition
- a projection pixel selection unit that selects a projection pixel from pixels on the projection line based on a distance from the projection plane when a pixel can be extracted, and the selected projection image is displayed on the projection plane Project to And features.
- the present invention also provides a projection image creation step of creating a projection image by projecting a medical image obtained from the medical image diagnostic apparatus onto a projection plane, and a projection image display step of displaying the projection image.
- the projection image creation step includes: a pixel extraction step of extracting a pixel having a pixel value satisfying a predetermined threshold condition from pixels on the projection line; and the pixel extraction step When a pixel having a pixel value satisfying the threshold condition cannot be extracted, an arbitrary pixel on the projection line is selected as a projection pixel, and a pixel having a pixel value satisfying the threshold condition can be extracted
- a projection pixel selection step of selecting a projection pixel from pixels on the projection line based on a distance from the projection plane, and projecting the selected projection image Characterized in that it projected on.
- a medical image display device and a medical image display method for creating and displaying a projection image having depth information while retaining pixel values acquired at the time of photographing.
- the figure which shows the hardware constitutions of the medical image display apparatus of this invention The figure which shows the flow of a process of Example 1 of this invention.
- the figure which shows an example of GUI for setting a threshold value and distance by this invention Diagram for explaining how to create a projected image
- the figure explaining the method of determining a projection pixel by this invention Comparison diagram of projection image created by the present invention and conventional MIP image
- the figure explaining that the projection image created by the present invention is shaded
- a figure that supplementarily explains how to obtain the distance between two points specified on a projected image The figure which shows an example of GUI for displaying the pixel value profile on a projection line
- FIG. 1 is a diagram showing a hardware configuration of the medical image display apparatus 1.
- the medical image display device 1 has a CPU (Central Processing Unit) 2, a main memory 3, a storage device 4, a display memory 5, a display device 6, a controller 7 connected to a mouse 8, a keyboard 9, and a network adapter 10, and a system bus 11 is configured so as to be able to send and receive signals.
- the medical image display device 1 is connected to a medical image photographing device 13 and a medical image database 14 via a network 12 so as to be able to send and receive signals.
- “to enable signal transmission / reception” indicates a state in which signals can be transmitted / received to each other or from one to the other, regardless of whether they are electrically or optically wired or wireless.
- the CPU2 is a device that controls the operation of each component.
- the CPU 2 loads a program stored in the storage device 4 and data necessary for program execution into the main memory 3 and executes it.
- the storage device 4 is a device that stores medical image information captured by the medical image capturing device 13, and is specifically a hard disk or the like.
- the storage device 4 may be a device that exchanges data with a portable recording medium such as a flexible disk, an optical (magnetic) disk, a ZIP memory, or a USB memory.
- the medical image information is acquired from the medical image photographing device 13 and the medical image database 14 via a network 12 such as a LAN (Local Area Network).
- the storage device 4 stores a program executed by the CPU 2 and data necessary for program execution.
- the main memory 3 stores programs executed by the CPU 2 and the progress of arithmetic processing.
- the display memory 5 temporarily stores display data to be displayed on the display device 6 such as a liquid crystal display or a CRT (Cathode Ray Tube).
- the mouse 8 and the keyboard 9 are operation devices for an operator to give an operation instruction to the medical image display device 1.
- the mouse 8 may be another pointing device such as a trackpad or a trackball.
- the controller 7 detects the state of the mouse 8, acquires the position of the mouse pointer on the display device 6, and outputs the acquired position information and the like to the CPU 2.
- the network adapter 10 is for connecting the medical image display apparatus 1 to a network 12 such as a LAN, a telephone line, or the Internet.
- the medical image photographing device 13 is a device that acquires medical image information such as a tomographic image of a subject.
- the medical imaging apparatus 13 is, for example, an MRI apparatus, an X-ray CT apparatus, an ultrasonic diagnostic apparatus, a scintillation camera apparatus, a PET apparatus, a SPECT apparatus, or the like.
- the medical image database 14 is a database system that stores medical image information captured by the medical image capturing device 13.
- FIG. 2 is a diagram showing a processing flow of the first embodiment of the present invention. Hereinafter, each step of FIG. 2 will be described in detail.
- a CT image is used as a medical image.
- an MR image, an ultrasonic image, or the like may be used.
- Step S201 The CPU 2 acquires the three-dimensional image data of the subject selected by the operator by operating the mouse 8 or the keyboard 9 from the medical image photographing device 13 or the medical image database 14 via the network 12.
- the three-dimensional image data is several to hundreds of tomographic images obtained by imaging a subject, and is configured to be continuously arranged in a certain direction, for example, a direction perpendicular to the tomographic plane. is there.
- the CPU 2 acquires projection line and projection plane data set by the operator operating the mouse 8 and the keyboard 9.
- the projection line data is a projection direction or the like with respect to the three-dimensional image data
- the projection plane data is a relative position with respect to the three-dimensional image data.
- Step S202 The CPU 2 determines whether or not there is a pixel having a pixel value larger than a predetermined threshold on the projection line. If a pixel having a pixel value larger than the threshold is on the projection line, the process proceeds to S203, and if not, the process proceeds to S205.
- a threshold value stored in advance in the storage device 4 may be used, or the operator can use a pointing device such as the mouse 8 from the screen 600 as shown in FIG.
- a set threshold value may be used.
- FIG. 3 will be described in detail later. For example, when it is desired to observe a region having a CT value of about 400, the operator sets the threshold value to 400.
- the “pixel value larger than the threshold value” here is the same as the “pixel value that is equal to or greater than the threshold value” or “the pixel value that satisfies the threshold value”. There is no impact on the device or system to be applied.
- Step S203 The CPU 2 stores the coordinates of the pixel closest to the projection plane in the main memory 3 among the pixels having a pixel value larger than the threshold value.
- a method of determining the coordinates of the pixel closest to the projection plane among the pixels having a pixel value larger than the threshold value will be described with reference to FIGS. In the following description, it is assumed that a value substantially equal to the pixel values A2 and B2 is set as the threshold value.
- FIG. 4 is a diagram illustrating a state in which the three-dimensional image 400 is projected onto the projection plane 410 using the projection lines 411A and 411B.
- the three-dimensional image 400 includes a spine 401, a rib, and a blood vessel 402.
- the pixel value A1 of the spine 401 and the pixel value B1 of the ribs are larger than the pixel values A2 and B2 of the blood vessel 402.
- the projection lines 411A and 411B are orthogonal to the projection plane 401.
- the projection plane 401 is a plane composed of the H axis and the V axis, and the direction orthogonal to the projection plane 401 is the P axis.
- the projection lines 411A and 411B are parallel to the P axis. Further, the projection line 411A is a line passing through the spine 401 having the pixel value A1 and the blood vessel 402 having the pixel value A2, and the projection line 411B is a line passing through the blood vessel 402 having the pixel value B2 and the rib having the pixel value B1. It is.
- FIG. 5 shows CT value profiles on the projection lines 411A and 411B, with the vertical axis representing the CT value and the horizontal axis representing the distance from the projection plane.
- Fig. 5 (a) shows the CT value profile over almost the entire area of the projection lines 411A and 411B shown in Fig. 4, and
- Fig. 5 (b) shows a part of the P-axis direction of Fig. 5 (a). It is an enlarged view. Since the projection line 411A passes through the spine 401 and the blood vessel 402, the CT value profile on the projection line 411A becomes a curve as shown by the broken line in FIG.
- the CT value profile on the projection line 411B is a curve as shown by the solid line in FIG. 5 (a). Comparing the profile on the projection line 411A and the profile on the projection line 411B with the threshold value, and searching for the coordinates of the P axis of the pixel closest to the projection plane among the pixels having pixel values larger than the threshold value , P A and P B respectively. Note that the coordinates of the H axis and the V axis are determined for each projection line because the projection line is orthogonal to the projection plane. Therefore, (H A , V A , P A ) and (H B , V B , P B ) are determined as the coordinates (H, V, P) stored in this step.
- Step S204 The CPU 2 projects the pixel value of the pixel at the coordinate obtained by shifting the predetermined distance ⁇ P on the projection line from the coordinate stored in S203 on the projection plane.
- the value of the distance ⁇ P may be positive or negative. If the value of the distance ⁇ P is positive, the pixel value of the coordinate shifted in the direction away from the projection plane is projected, and if it is negative, the value approaches the projection plane. Will shift in the direction.
- the operator may set the distance ⁇ P from the screen 600 as shown in FIG. 3 using a pointing device such as the mouse 8.
- FIG. 3 will be described in detail later.
- the coordinates stored in S203 are (H A , V A , P A ) and (H B , V B , P B )
- the coordinates obtained by shifting the distance ⁇ P on the projection line are (H A , V A , P A + ⁇ P) and (H B , V B , P B + ⁇ P)
- the pixel values of the respective coordinates are obtained on the profile shown in FIG. 5B, and are A2 ′ and B1 ′.
- the CPU 2 projects the obtained pixel values A2 ′ and B1 ′ onto the projection plane 401 as shown in FIG.
- the pixel value A2 ′ is different from the pixel value A2, and the pixel value B1 ′ is also different from the pixel value B1.
- the profile on the projection line is different in different parts, so the projected pixel values are different values, for example, A2 'and B1', and the difference in parts is on the projected image. Will be reflected.
- Step S205 The CPU 2 projects the pixel value of any pixel on the projection line onto the projection plane.
- the pixel value projected in this step may be the maximum pixel value or the minimum pixel value on the projection line. Further, an existing projection method such as calculating and projecting an average value of all pixel values on the projection line may be used.
- Step S206 The CPU 2 determines whether or not all projection lines are projected on the projection plane. If all projection lines are projected, the process proceeds to S208, and if there is a projection line that is not projected, the process proceeds to S207.
- Step S207 The CPU 2 moves the projection line to the next projection line not projected on the projection plane, and then returns to S202.
- Step S208 The CPU 2 displays the projection image on the display device 6.
- a projection image according to the present embodiment is created and displayed on a screen 600 as shown in FIG. 3, for example.
- the screen 600 shown in FIG. 3 will be described.
- FIG. 3 shows an example of a screen 600 displayed on the display device 6.
- the screen 600 includes a projected image display area 601, a threshold setting bar 602, and a distance setting bar 603.
- the projected image display area 601 is an area where the projected image created by the present embodiment is displayed.
- the threshold setting bar 602 is an operation icon for setting the threshold used in S202.
- the operator can change the threshold value by operating the threshold setting bar 602 using a pointing device such as the mouse 8.
- the threshold value setting bar 602 shown here can set a threshold value in the range of -1000 to 2000.
- the distance setting bar 603 is an operation icon for setting the distance ⁇ P used in S204.
- the operator can change the distance by operating the distance setting bar 603 using a pointing device such as the mouse 8.
- the distance value can be set in the range of -2 mm to 2 mm.
- the unit of distance is mm, but the unit of distance may be the number of pixels.
- Fig. 6 (a) shows an example of the projection image created by this embodiment in comparison with the MIP image shown in Fig. 6 (b).
- Fig. 6 shows the projection image and MIP image of this example using 3D image data in which blood vessels running parallel to the body axis of the subject are simulated in the chest rib image data. is there.
- the MIP image shown in FIG. 6 (b) all the ribs appear to be located in front of the blood vessels, whereas in the projection image created by the present embodiment shown in FIG. The positional relationship with the blood vessel in the depth direction is correctly displayed.
- all of the ribs are displayed with substantially the same pixel value, whereas in the projection image created according to the present embodiment, the ribs are displayed as shaded.
- FIG. 7 is a diagram showing a state in which a part 700 such as a rib is projected by a projection line group 710.
- the pixel value at the boundary portion of the part 700 is smaller than the internal pixel value. Therefore, when an equal pixel value line is drawn in the part 700, the pixel value becomes 701 to 703, and the equal pixel value line 703 ⁇ equal pixel.
- value line 702 ⁇ equal pixel value line 701 is established.
- the maximum pixel value on the projection line is projected in the MIP image, so that the profile 721 indicated by the solid line is obtained.
- the pixel value on the broken line 711 which is the coordinate shifted by the distance ⁇ P from the boundary of the part 700 is projected, so that the profile 722 indicated by the broken line is obtained.
- the projected image according to the present embodiment is displayed as shaded, and becomes an image having depth information while retaining the pixel value acquired at the time of photographing.
- FIG. 9 shows an example of a GUI displayed on the display device 6 in order to display the pixel value profile on the projection line.
- the screen 600 includes a cursor 801, a projection image display area 601, a profile button 604, and an end button 605.
- the cursor 801 is used by the operator to designate an arbitrary position on the screen 600 by operating a pointing device such as the mouse 8.
- a profile button 604 is used to display a CT value profile on a projection line passing through a specified position.
- An end button 605 is used to end the profile display.
- a CT value profile passing through the designated position as shown in FIG. 9 is displayed.
- the operator can continuously observe the CT values in the direction orthogonal to the projection plane at the point designated by the cursor 801. As a result, the diagnosis based on the CT value can be performed in more detail for the site to be observed.
- Example 1 was to create a projection image with a single value of the distance ⁇ P.
- different projection images are created using a plurality of distances ⁇ P, and the created projection images are sequentially displayed.
- the operator can continuously observe the CT value in the direction orthogonal to the projection plane, so that the diagnosis based on the CT value can be performed in more detail.
- FIG. 10 is a diagram showing a processing flow of the second embodiment of the present invention. Hereinafter, each step of FIG. 10 will be described in detail. The same steps as those in the first embodiment are denoted by the same step symbols, and the description thereof is omitted.
- Step S1008 The CPU 2 stores the created projection image in association with the distance ⁇ P.
- Step S1009 The CPU 2 determines whether a projection image is stored for each of a plurality of predetermined ⁇ P. If projection images are stored for all ⁇ P, the process proceeds to S1011, and if not, the process proceeds to S1010.
- Step S1010 After changing the value of the distance ⁇ P, the CPU 2 returns to S202.
- Step S1011 The CPU 2 causes the display device 6 to continuously display the plurality of projection images stored in S1008 according to the value of ⁇ P. Or you may display the projection image corresponding to (DELTA) P according to (DELTA) P input via GUI with which an operator can change (DELTA) P arbitrarily.
- a plurality of projection images created according to the present embodiment are sequentially displayed.
- the operator can set the observation target region on the projection plane by appropriately setting the threshold value of the observation target region.
- the CT values in the orthogonal direction can be observed continuously. As a result, the diagnosis based on the CT value can be performed in more detail for the site to be observed.
- the coordinates of the pixel farthest from the projection plane may be stored instead of the coordinates of the pixel closest to the projection plane among the pixels having a pixel value larger than the threshold value. Saving the coordinates of pixels far from the projection plane is equivalent to arranging the projection plane on the opposite side.
- 1 medical image display device 2 CPU, 3 main memory, 4 storage device, 5 display memory, 6 display device, 7 controller, 8 mouse, 9 keyboard, 10 network adapter, 11 system bus, 12 network, 13 medical imaging device , 14 Medical image database
Abstract
Description
CPU2は、操作者がマウス8やキーボード9を操作して選択した被検体の3次元画像データを医用画像撮影装置13または医用画像データベース14からネットワーク12を介して取得する。ここで3次元画像データとは被検体を撮影して得られた数枚から数百枚の断層画像であり、ある方向、例えば断層面に垂直な方向に連続して並んで構成されるものである。
また、CPU2は、操作者がマウス8やキーボード9を操作することにより設定された投影線及び投影面のデータを取得する。ここで投影線のデータとは3次元画像データに対する投影方向等であり、投影面のデータとは3次元画像データに対する相対的な位置等である。 (Step S201)
The CPU 2 acquires the three-dimensional image data of the subject selected by the operator by operating the
Further, the CPU 2 acquires projection line and projection plane data set by the operator operating the
CPU2は、投影線上に、予め定められたしきい値より大きい画素値を有する画素があるか否かを判定する。しきい値よりも大きな画素値を有する画素が投影線上にあればS203へ進み、なければS205へ進む。 (Step S202)
The CPU 2 determines whether or not there is a pixel having a pixel value larger than a predetermined threshold on the projection line. If a pixel having a pixel value larger than the threshold is on the projection line, the process proceeds to S203, and if not, the process proceeds to S205.
CPU2は、しきい値よりも大きな画素値を有する画素の中で、もっとも投影面に近い画素の座標を主メモリ3に保存する。図4及び図5を用いて、しきい値よりも大きな画素値を有する画素の中で、もっとも投影面に近い画素の座標を決める方法について説明する。なお、以下の説明では、画素値A2及びB2とほぼ等しい値がしきい値として設定されているものとする。 (Step S203)
The CPU 2 stores the coordinates of the pixel closest to the projection plane in the main memory 3 among the pixels having a pixel value larger than the threshold value. A method of determining the coordinates of the pixel closest to the projection plane among the pixels having a pixel value larger than the threshold value will be described with reference to FIGS. In the following description, it is assumed that a value substantially equal to the pixel values A2 and B2 is set as the threshold value.
CPU2は、S203で保存された座標から予め定められた距離ΔPを投影線上でずらした座標の画素の画素値を投影面に投影する。 (Step S204)
The CPU 2 projects the pixel value of the pixel at the coordinate obtained by shifting the predetermined distance ΔP on the projection line from the coordinate stored in S203 on the projection plane.
CPU2は、投影線上の任意の画素の画素値を投影面に投影する。本ステップで投影される画素値は、投影線上の最大画素値や最小画素値でも良い。また、投影線上の全ての画素値の平均値を算出して投影するなどの既存の投影方法を用いても良い。 (Step S205)
The CPU 2 projects the pixel value of any pixel on the projection line onto the projection plane. The pixel value projected in this step may be the maximum pixel value or the minimum pixel value on the projection line. Further, an existing projection method such as calculating and projecting an average value of all pixel values on the projection line may be used.
CPU2は、全投影線が投影面に投影されたか否かを判定する。全投影線が投影されていればS208へ進み、投影されていない投影線があればS207へ進む。 (Step S206)
The CPU 2 determines whether or not all projection lines are projected on the projection plane. If all projection lines are projected, the process proceeds to S208, and if there is a projection line that is not projected, the process proceeds to S207.
CPU2は、投影面に投影されていない次の投影線へ投影線を移動させた後、S202へ戻る。 (Step S207)
The CPU 2 moves the projection line to the next projection line not projected on the projection plane, and then returns to S202.
CPU2は、投影画像を表示装置6に表示させる。 (Step S208)
The CPU 2 displays the projection image on the
L={ (H A- H B)2+(V A-V B)2+(P A-PB)2}0.5
図9に投影線上の画素値プロファイルを表示させるために表示装置6に表示されるGUIの一例を示す。本画面600には、カーソル801と、投影画像表示領域601と、プロファイルボタン604と、終了ボタン605と、が含まれる。カーソル801は操作者がマウス8等のポインティングデバイスを操作することにより画面600上の任意の位置を指定するのに用いられるものである。プロファイルボタン604は指定位置を通る投影線上のCT値プロファイルを表示させるのに用いられるものである。終了ボタン605はプロファイル表示を終了させるためのものである。 {Number 1}
L = {(H A -H B ) 2 + (V A -V B ) 2 + (P A -P B ) 2 } 0.5
FIG. 9 shows an example of a GUI displayed on the
実施例1と同じである。 (Steps S201 to S207)
Same as Example 1.
CPU2は、作成された投影画像を距離ΔPと対応付けて格納する。 (Step S1008)
The CPU 2 stores the created projection image in association with the distance ΔP.
CPU2は、予め定められた複数のΔPのそれぞれに対して投影画像が格納されたかどうかを判定する。全てのΔPに対し投影画像が格納されていればS1011へ進み、そうでなければS1010へ進む。 (Step S1009)
The CPU 2 determines whether a projection image is stored for each of a plurality of predetermined ΔP. If projection images are stored for all ΔP, the process proceeds to S1011, and if not, the process proceeds to S1010.
CPU2は、距離ΔPの値を変えた後、S202へ戻る。 (Step S1010)
After changing the value of the distance ΔP, the CPU 2 returns to S202.
CPU2は、S1008で格納された複数の投影画像をΔPの値に順じて表示装置6に連続表示させる。或いは、操作者がΔPを任意に変更できるGUIを介して入力されたΔPに応じてΔPに対応する投影画像を表示しても良い。 (Step S1011)
The CPU 2 causes the
Claims (8)
- 医用画像診断装置から得られた医用画像を投影面に投影して投影画像を作成する投影画像作成部と、前記投影画像を表示する投影画像表示部と、を備えた医用画像表示装置であって、
前記投影画像作成部は、
投影線上の画素の中から予め定められたしきい値条件を満たした画素値を有する画素を抽出する画素抽出部と、
前記画素抽出部が前記しきい値条件を満たした画素値を有する画素を抽出できない場合には前記投影線上の任意の画素を投影画素として選択し、前記しきい値条件を満たした画素値を有する画素を抽出できた場合には前記投影面からの距離に基づいて前記投影線上の画素の中から投影画素を選択する投影画素選択部と、
を備えて、前記選択された投影画像を前記投影面に投影することを特徴とする医用画像表示装置。 A medical image display device comprising: a projection image creation unit that projects a medical image obtained from a medical image diagnostic device onto a projection plane to create a projection image; and a projection image display unit that displays the projection image. ,
The projection image creation unit
A pixel extraction unit that extracts a pixel having a pixel value satisfying a predetermined threshold condition from pixels on the projection line;
When the pixel extraction unit cannot extract a pixel having a pixel value that satisfies the threshold condition, an arbitrary pixel on the projection line is selected as a projection pixel, and the pixel value satisfies the threshold condition A projection pixel selection unit that selects a projection pixel from pixels on the projection line based on a distance from the projection plane when a pixel can be extracted;
A medical image display device that projects the selected projection image onto the projection plane. - 請求項1に記載の医用画像表示装置において、
前記投影画素選択部は前記画素抽出部が抽出した画素の中から前記投影面に最も近い画素の位置を算出し、
算出された画素位置から前記投影線上で所定の距離ずれた画素を選択することを特徴とする医用画像表示装置。 In the medical image display device according to claim 1,
The projection pixel selection unit calculates the position of the pixel closest to the projection plane from the pixels extracted by the pixel extraction unit,
A medical image display device, wherein a pixel shifted by a predetermined distance on the projection line from the calculated pixel position is selected. - 請求項2に記載の医用画像表示装置において、
前記所定の距離を設定する距離設定部をさらに備えることを特徴とする医用画像表示装置。 In the medical image display device according to claim 2,
A medical image display device further comprising a distance setting unit for setting the predetermined distance. - 請求項2に記載の医用画像表示装置において、
複数の前記所定の距離毎に投影画像を対応させて格納する投影画像格納部をさらに備え、
前記投影画像表示部は、前記所定の距離の値に順じて前記所定の距離毎に対応する投影画像を連続表示することを特徴とする医用画像表示装置。 In the medical image display device according to claim 2,
A projection image storage unit that stores a projection image corresponding to each of the plurality of predetermined distances;
The medical image display device, wherein the projected image display unit continuously displays projected images corresponding to the predetermined distances in order of the predetermined distance value. - 医用画像診断装置から得られた医用画像を投影面に投影して投影画像を作成する投影画像作成ステップと、前記投影画像を表示する投影画像表示ステップと、を備えた医用画像表示方法であって、
前記投影画像作成ステップは、
投影線上の画素の中から予め定められたしきい値条件を満たした画素値を有する画素を抽出する画素抽出ステップと、
前記画素抽出ステップで前記しきい値条件を満たした画素値を有する画素を抽出できない場合には前記投影線上の任意の画素を投影画素として選択し、前記しきい値条件を満たした画素値を有する画素を抽出できた場合には前記投影面からの距離に基づいて前記投影線上の画素の中から投影画素を選択する投影画素選択ステップと、を備えて、前記選択された投影画像を前記投影面に投影することを特徴とする医用画像表示方法。 A medical image display method comprising: a projection image creation step for creating a projection image by projecting a medical image obtained from a medical image diagnostic apparatus onto a projection plane; and a projection image display step for displaying the projection image. ,
The projection image creating step includes
A pixel extraction step of extracting a pixel having a pixel value satisfying a predetermined threshold condition from the pixels on the projection line;
If a pixel having a pixel value that satisfies the threshold condition cannot be extracted in the pixel extraction step, an arbitrary pixel on the projection line is selected as a projection pixel, and the pixel value satisfies the threshold condition A projection pixel selection step of selecting a projection pixel from the pixels on the projection line based on a distance from the projection plane when a pixel can be extracted, and the selected projection image is selected from the projection plane. A medical image display method characterized by projecting onto a screen. - 医用画像診断装置から得られた医用画像を投影面に投影して投影画像を作成する投影画像作成部と、前記投影画像を表示する投影画像表示部と、を備えた医用画像表示装置であって、
前記投影画像表示部は、医用画像診断装置が撮影時に取得した画素値を保持しながら、奥行き情報も有する投影画像を表示することを特徴とする医用画像表示装置。 A medical image display device comprising: a projection image creation unit that projects a medical image obtained from a medical image diagnostic device onto a projection plane to create a projection image; and a projection image display unit that displays the projection image. ,
The said projection image display part displays the projection image which also has depth information, hold | maintaining the pixel value which the medical image diagnostic apparatus acquired at the time of imaging | photography, The medical image display apparatus characterized by the above-mentioned. - 請求項6に記載の医用画像表示装置において、
前記奥行き情報が、前記投影画像中の陰影情報を含むことを特徴とする医用画像表示装置。 In the medical image display device according to claim 6,
The medical image display apparatus, wherein the depth information includes shadow information in the projection image. - 医用画像診断装置から得られた医用画像を投影面に投影して投影画像を作成する投影画像作成ステップと、前記投影画像を表示する投影画像表示ステップと、を備えた医用画像表示方法であって、
前記投影画像表示ステップは、医用画像診断装置が撮影時に取得した画素値を保持しながら、奥行き情報も有する投影画像を表示することを特徴とする医用画像表示方法。 A medical image display method comprising: a projection image creation step for creating a projection image by projecting a medical image obtained from a medical image diagnostic apparatus onto a projection plane; and a projection image display step for displaying the projection image. ,
In the projected image display step, a projected image having depth information is displayed while holding a pixel value acquired by the medical image diagnostic apparatus at the time of photographing.
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JP2013017619A (en) * | 2011-07-11 | 2013-01-31 | Canon Inc | Ophthalmologic image processing apparatus, ophthalmologic image processing method, program for executing the method, and storage medium |
CN104902818A (en) * | 2013-02-05 | 2015-09-09 | 株式会社日立医疗器械 | X-ray CT device and image reconstruction method |
JP2016007502A (en) * | 2014-06-26 | 2016-01-18 | 株式会社東芝 | Medical image processing apparatus and medical image processing method |
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JPH03147082A (en) * | 1989-11-01 | 1991-06-24 | Hitachi Ltd | Three-dimensional data display method |
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JP2013017619A (en) * | 2011-07-11 | 2013-01-31 | Canon Inc | Ophthalmologic image processing apparatus, ophthalmologic image processing method, program for executing the method, and storage medium |
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