WO2010064687A1 - 医用画像表示装置及び医用画像表示方法 - Google Patents
医用画像表示装置及び医用画像表示方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 38
- 210000000056 organ Anatomy 0.000 claims description 53
- 238000005452 bending Methods 0.000 claims description 16
- 239000013598 vector Substances 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims 1
- 210000001835 viscera Anatomy 0.000 abstract 3
- 210000002429 large intestine Anatomy 0.000 description 12
- 238000000605 extraction Methods 0.000 description 8
- 238000003745 diagnosis Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 208000037062 Polyps Diseases 0.000 description 3
- 238000002059 diagnostic imaging Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 210000001599 sigmoid colon Anatomy 0.000 description 2
- 210000003384 transverse colon Anatomy 0.000 description 2
- 210000001815 ascending colon Anatomy 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 210000001072 colon Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 210000001731 descending colon Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
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Classifications
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- 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
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
- A61B5/7425—Displaying combinations of multiple images regardless of image source, e.g. displaying a reference anatomical image with a live image
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/46—Arrangements for interfacing with the operator or the patient
- A61B6/461—Displaying means of special interest
- A61B6/466—Displaying means of special interest adapted to display 3D data
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/48—Diagnostic techniques
- A61B8/483—Diagnostic techniques involving the acquisition of a 3D volume of data
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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
Definitions
- the present invention relates to a medical image display apparatus that displays a luminal organ of a subject as a developed image, and particularly to a technique for calculating a false image rate according to a position in the developed image and presenting it to an operator.
- a method for virtual endoscopic display of the lumen of a luminal organ such as a blood vessel or large intestine using an image taken with a medical diagnostic imaging apparatus such as an X-ray CT apparatus or an MRI apparatus is used for the inner wall of the luminal organ.
- a medical diagnostic imaging apparatus such as an X-ray CT apparatus or an MRI apparatus.
- MPR Multi-Planner Reconstruction
- a developed image has been devised (Patent Document 1).
- the developed image is an image that is cut open in the long axis direction and displayed like a specimen, and since the state of the inner wall of the hollow organ can be viewed, it is expected as a method for reducing the burden of interpretation.
- observing the inner wall of the large intestine it is possible to observe the inner wall of the large intestine on a flat surface in the developed image, so it is easy to find polyps etc. that exist between the large intestine folds that could have been overlooked in the virtual endoscopic image become.
- the developed image radiates virtual rays radially from each point on the center line of the large intestine area lumen, and the pixel values and reflected light of the part where the virtual rays hit the inner wall of the large intestine are placed on the inner surface of one linear cylindrical model It is created by projecting, opening the cylindrical model in the long axis direction, and expanding the inner surface of the cylindrical model on a plane.
- the developed image may not correctly display the shape of the inner wall depending on the position of the luminal organ.
- bent parts such as the ascending colon to the transverse colon, the transverse colon to the descending colon, and the sigmoid colon.
- the image of the bent part is distorted .
- the inner side of the bent portion is an image stretched in the long axis direction of the hollow organ, and conversely, the outer side of the bent portion is a compressed image.
- Such distortion can cause misdiagnosis in image diagnosis.
- a spherical polyp that exists in a bent part may appear like a heel when it is displayed extending or contracting in the long axis direction of the large intestine. May appear like a polyp.
- the operator must observe the developed image in consideration that the shape of the inner wall may not be correctly displayed depending on the position of the luminal organ. However, it is difficult to determine whether or not the display of the observation site is correct only by observing the developed image.
- the present invention has been made in view of such circumstances, and in a medical image display device that displays a luminal organ of a subject as a developed image, an operator determines whether the display of an observation site on the developed image is correct.
- the purpose is to enable easy judgment.
- the present invention provides a medical image display device comprising a developed image creating means for creating a developed image of a luminal organ of a subject and a display means for displaying the developed image. And a control unit that displays the false image rate in association with the developed image.
- the present invention provides a medical image display device including a developed image creating unit that creates a developed image of a luminal organ of a subject and a display unit that displays the developed image, according to a position in the developed image.
- the image processing apparatus includes: a false image rate calculation unit that calculates a false image rate at the position; and a control unit that displays the developed image based on the false image rate.
- the present invention provides a medical image display method comprising a developed image creating step for creating a developed image of a luminal organ of a subject and a display step for displaying the developed image according to a position in the developed image.
- a false image rate calculating step for calculating a false image rate at the position; and a control step for displaying the display step false image rate in association with the developed image.
- a medical image display method comprising a developed image creating step of creating a developed image of a luminal organ of a subject and a display step of displaying the developed image
- the position of the false image is determined according to the position in the developed image.
- the operator in a medical image display device that displays a luminal organ of a subject as a developed image, the operator can easily determine whether or not the display of the observation site on the developed image is correct. Since the operator can easily determine whether or not the display of the observation site on the developed image is correct, it is possible to reduce misdiagnosis of the image diagnosis based on the developed image.
- FIG. 9 is a diagram showing a display example 2.
- FIG. 10 is a diagram showing a display example 3.
- FIG. 10 is a diagram showing a display example 4.
- FIG. 10 is a diagram showing a display example 5.
- FIG. 1 is a diagram showing a hardware configuration of the medical image display apparatus 1.
- the medical image display device 1 includes a CPU (Central Processing Unit) 2, a main memory 3, a storage device 4, a display memory 5, a display device 6, a mouse 8 and keyboard 9 connected to the controller 7, and a network adapter 10 including a system bus 11. Connected and configured.
- 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.
- 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.
- the medical image information is acquired from the medical image capturing 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 mouse 8 and the keyboard 9 are operation devices for an operator to give an operation instruction to the medical image display apparatus 1.
- the mouse 8 may be another pointing device such as a trackpad or a trackball.
- the display memory 5 stores display data for display on a display device 6 such as a liquid crystal display or a CRT (Cathode Ray Tube).
- the controller 7 detects the state of the mouse 8, detects the position of the mouse pointer on the display device 6, and outputs a detection signal 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, or an ultrasonic diagnostic apparatus.
- the medical image database 14 is a database system that stores medical image information captured by the medical image capturing device 13.
- a developed image of the luminal organ is created, and the created developed image is displayed on the display device 6. Since there are portions in the developed image that are not correctly displayed depending on the position of the luminal organ, the operator must observe in consideration of which portion in the developed image is not correctly displayed. However, it is difficult to determine whether or not the display of the observation site is correct only by observing the developed image.
- the false image rate of the position that is, the degree to which the display of the position is not correct is calculated according to the position in the developed image, and the calculated false image rate is displayed on the display device 6 in correspondence with the developed image.
- the developed image is displayed on the display device 6 based on the calculated false image rate.
- a portion having a high false image rate in the developed image includes a bent portion of a luminal organ, for example, a sigmoid colon in the large intestine region. The greater the degree of bending, that is, the degree of bending of the luminal organ in the long axis direction, the greater the false image rate.
- FIG. 2 shows, in the present embodiment, the false image rate at the position calculated according to the position in the developed image is displayed corresponding to the developed image, or the developed image is displayed according to the calculated false image rate. It is a figure which shows the flow of the process for making it do. Hereinafter, each step of FIG. 2 will be described in detail.
- Step S201 The CPU 2 acquires the volume image data of the subject from the medical image photographing device 13 or the medical image database 14 via the network 12.
- the volume image data is several to several hundred 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. .
- Step S202 The CPU 2 extracts a luminal organ region from the volume image data acquired in step S201.
- a region extraction method there are a method of extraction by threshold processing using an upper limit value and a lower limit value of pixel values corresponding to a hollow organ to be extracted, a known region expansion method (Region Growing method), and the like.
- the CPU 2 performs processing such as setting a flag on the extracted area so that it can be distinguished from other areas.
- FIG. 3 shows an example in which the large intestine is extracted as a luminal organ from the volume image data area 301 and a flag is set in the extracted area.
- the extraction method of the luminal organ region and the data format of the extraction result used in the present embodiment are not limited to the above method, and any method can be used as long as the extraction result can be output to a subsequent processing step.
- the data format of the extraction result is a format in which a flag is set on the coordinates on the extraction area as shown in FIG.
- Step S203 The CPU 2 calculates a false image rate based on the extraction result in step S202.
- FIG. 4 shows a procedure for obtaining the degree of bending of the luminal organ in the long axis direction as a false image rate as an example of the processing flow for calculating the false image rate. Each step will be described below.
- Step S401 The CPU 2 obtains the center line of the luminal organ and obtains the coordinate data of the obtained center line.
- a method of obtaining the center line there are a method of obtaining a geometrical organ by thinning a luminal organ, and a method of obtaining a known deepest part search method from a specified point in the luminal organ region.
- MPR Multi Planner Reconstruction
- the CPU 2 treats the obtained center line 511 as a set of points, sets a plurality of points Cn on the center line 511 at equal intervals, and stores the coordinates of each point Cn in the main memory 3 to Get coordinate data.
- Step S402 The CPU 2 selects a point of interest C from among a plurality of points Cn as a target location for obtaining the degree of bending of the luminal organ in the long axis direction.
- Step S403 The CPU 2 sets, as tangent vector calculation points, points that are separated by a certain distance in the front-rear direction, for example, points C1 and C2 adjacent to C, as neighboring points of the target point C selected in step S402 (see FIG. 6).
- Step S404 CPU2 calculates tangent vectors D1 and D2 of center line 511 at points C1 and C2.
- Step S405 The CPU 2 calculates the inner product P of the tangent vectors D1 and D2 as a curvature at the point of interest C using (Equation 1) and sets the degree of bending of the luminal organ in the long axis direction.
- the radius R of the luminal organ lumen is set to the distances R 1 , R 2 , R 3 ,... R N at each angle from the point of interest C on the center line 511 as shown in FIG. It may be obtained as an average value of.
- the degree of bending of the luminal organ in the long axis direction obtained in this step is stored in the main memory 3 or the storage device 4 in association with each point on the center line 511.
- the degree of bending and each point on the center line 511 in association with each other for example, the curvature as shown in FIG. 10 and the center line position that is the position on the center line 511 in the long axis direction of the luminal organ can be obtained.
- Graphs can be created.
- Step S204 CPU2 creates a developed image for the luminal organ region extracted in step S202.
- the method described in Patent Document 1 may be used to create the developed image.
- an outline of a developed image creation method will be described with reference to FIG.
- a plurality of virtual rays 1100 are set in the radial direction from the point of interest C on the center line 511 as shown in FIG. At this time, the angles between the virtual rays are preferably equal.
- the volume image data acquired in step S201 is associated with the points B 1 , B 2 , B 3 , B 4 ,..., B N on the inner wall of the luminal organ. Then, as shown in FIG. 11 (b), the projection plane with the vertical axis as the angular direction shown in FIG. 11 (a) and the horizontal axis as the center line position which is the position on the center line 511 in the long axis direction of the luminal organ. The image data associated with the above is projected.
- the developed image is created by the CPU 2 executing the processes (1) to (3) described above while changing the center line position.
- Step S205 The CPU 2 displays the false image rate for each center line position calculated in step S203 in association with the developed image created in step S204, or displays the developed image according to the false image rate.
- a display example will be described below. In the following display examples, the curvature, which is one of the degrees of bending of the luminal organ in the long axis direction, is used as the false image rate.
- Display example 1 This display example is shown in FIG.
- a developed image 1200 and a color bar 1201 are displayed on the screen 1202 of the display device 6.
- the color bar 1201 is assigned a different color for each center line position, and a different color is assigned according to the curvature determined for each center line position in step S203. For example, since the distortion in the developed image increases at a position where the curvature is large, red is used to alert the operator, and blue is used because the distortion in the developed image does not increase at a position where the curvature is small. Each position is assigned a yellow color.
- the operator can know which observation part on the developed image has a large curvature, that is, a high false image rate, and misdiagnosis of image diagnosis based on the developed image. Can be reduced.
- Display example 2 This display example is shown in FIG. In this display example, a developed image 1300 having partially different transparency is displayed on the screen 1202 of the display device 6. Note that a dotted line portion in the developed image 1300 represents a portion displayed with the transparency changed.
- the transparency of the developed image 1300 differs depending on the curvature, and a high transparency is set at a position where the curvature in the developed image has a large distortion and a low transparency is set at a position where the curvature is small.
- the operator can concentrate and observe the portion of the developed image where the curvature is small, that is, the portion where the false image rate is low, and misdiagnosis of image diagnosis based on the developed image. Can be reduced.
- Display example 3 An example of this display is shown in FIG.
- the developed image 1200 and the graph 1400 are displayed side by side on the screen 1202 of the display device 6.
- a graph 1400 is the same as that shown in FIG. 10, and shows the relationship between the curvature and the center line position.
- the operator can know which observation part on the developed image has a large curvature, that is, a high false image rate, and misdiagnosis of image diagnosis based on the developed image. Can be reduced.
- the developed image is displayed by treating the curvature, which is a false image rate, as a continuous value.
- the threshold value is determined for the curvature, which is the false image rate, based on the determination result.
- a developed image may be displayed.
- FIG. 15 is a diagram illustrating an example of a flow of threshold determination processing. Hereinafter, each step of FIG. 15 will be described.
- Step S151 CPU2 acquires the threshold value.
- the acquired threshold value may be a value stored in advance in the storage device 4, or may be an upper limit value and / or a lower limit value set by the operator using the threshold setting screen 1600 shown in FIG.
- Step S152 The CPU 2 compares the threshold obtained in step S151 with the curvature obtained for each center line position in S203, and determines whether the curvature is within the threshold range. As a result of the determination, if the curvature is within the threshold range, the process proceeds to step S153, and if not within the range, the process ends.
- Step S153 The CPU 2 displays the curvature on the screen 1202 of the display device 6 together with the developed image 1200.
- a display example of this step is shown in FIG.
- a curvature display bar 1700 is displayed on the screen 1202 together with the developed image 1200.
- the curvature display bar 1700 displays a bar at a location where the curvature is within a threshold range. For example, the bar is displayed at a location where the curvature is larger than the threshold acquired in step S151.
- the operator can know which observation site on the developed image has a high false image rate, and can reduce misdiagnosis of image diagnosis based on the developed image. It becomes like this.
- Display example 5 This display example is shown in FIG.
- the developed image 1200 is scroll-displayed on the screen 1202 of the display device 6.
- the scroll direction is from left to right, but it may be reversed.
- the scroll speed of the portion determined to be within the threshold range by the threshold determination shown in FIG. Is scrolled.
- the present invention is not limited to these examples.
- the display on the developed image is performed. Any device may be used as long as it provides the operator with the false image rate of the observation site.
- the scroll speed may be continuously changed according to the curvature value.
- 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, 301 volume image data area, 302 luminal organ area, 501 axial section, 502 sagittal section, 503 coronal section, 511 center line, 512 set point, 700 section, 1100 virtual ray, 1200 unfolded image, 1201 Color bar, 1202 screen, 1300 expanded image, 1400 graph, 1600 threshold setting screen, 1700 curvature display bar
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Abstract
Description
展開画像において偽像率の高い箇所としては管腔臓器の屈曲部、例えば大腸領域のS状結腸などがある。屈曲の程度、すなわち管腔臓器の長軸方向の曲がりの度合いが大きいほど偽像率は大きくなる。
図2は、本実施形態において、展開画像中の位置に応じて算出される当該位置の偽像率を展開画像に対応させて表示させたり、算出された偽像率に応じて展開画像を表示させたりするための処理の流れを示す図である。以下、図2の各ステップについて詳細に説明する。
CPU2は、被検体のボリューム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。ここでボリューム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。
CPU2は、ステップS201にて取得したボリューム画像データの中から管腔臓器領域を抽出する。領域抽出の方法としては、抽出対象の管腔臓器に相当する画素値の上限値と下限値を用いた閾値処理によって抽出する方法や、公知の領域拡張法(Region Growing法)などがある。CPU2は、抽出された領域にフラグを立てる等の処理を行い、その他の領域と識別可能なようにする。図3に、ボリューム画像データ領域301の中から管腔臓器として大腸を抽出し、抽出した領域にフラグを立てた例を示す。
CPU2は、ステップS202の抽出結果に基づき偽像率を算出する。図4に偽像率算出の処理の流れの一例として、管腔臓器の長軸方向の曲がりの度合いを偽像率として求める手順を示し、以下で各ステップについて説明する。
CPU2は、管腔臓器の中心線を求め、求めた中心線の座標データを取得する。中心線を求める方法としては、管腔臓器を細線化することにより幾何学的に求める方法や、管腔臓器領域内の指定した点から公知の最深部検索法によって求める方法がある。また図5に示すようなアキシャル断面501、サジタル断面502、コロナル断面503のMPR(Multi Planner Reconstruction)画像から操作者がマウス8を操作することによりマニュアルで設定した自由曲線を中心線とする方法や、操作者が設定した複数の設定点512を通る曲線をスプライン補間などにより求めて中心線とする方法などが挙げられる。
CPU2は、管腔臓器の長軸方向の曲がりの度合いを求める対象箇所として、複数の点Cnの中から注目点Cを選択する。
CPU2は、ステップS402で選択された注目点Cの近傍点として前後に一定距離離れた点、例えばCに隣接する点C1とC2を接線ベクトル算出点として設定する(図6参照)。
CPU2は、点C1とC2における中心線511の接線ベクトルD1とD2を算出する。
CPU2は、(式1)を用いて、接線ベクトルD1とD2の内積Pを注目点Cにおける曲率として算出し、管腔臓器の長軸方向の曲がりの度合いとする。
図4の処理の流れでは、接線ベクトルD1とD2の内積Pを注目点Cにおける曲率として算出したが、(式2)を用いて求められる角度θを管腔臓器の長軸方向の曲がりの度合いとしても良い。
また、図7に示すような注目点Cにおいて中心線511に直交する断面700での管腔臓器内腔の半径R(図8参照)を内積Pに乗じたものを長軸方向の曲がりの度合いとしても良い。管腔臓器の長軸方向の曲がりによる展開画像中の歪の程度は、管腔臓器内腔の半径Rが大きくなるほど大きくなるので、半径Rを乗ずることにより、偽像率をより正確に求めることができる。
CPU2は、ステップS202で抽出された管腔臓器領域について、展開画像を作成する。展開画像の作成には、例えば特許文献1に記載の方法を用いれば良い。ここでは展開画像の作成方法について図11を用いて概要を説明する。
CPU2は、ステップS203で算出した中心線位置毎の偽像率を、ステップS204で作成した展開画像に対応付けて表示させたり、偽像率に応じて展開画像を表示させたりする。表示例について以下説明する。なお、以下の表示例では、管腔臓器の長軸方向の曲がりの度合いの一つである曲率を偽像率としている。
本表示例を図12に示す。本表示例では、表示装置6の画面1202に、展開画像1200とカラーバー1201が表示される。カラーバー1201は中心線位置毎に異なる色が割り付けられたものであり、ステップS203で中心線位置毎に求められた曲率に応じて異なる色が割り付けられる。例えば、曲率が大きい位置では展開画像中の歪が大きくなるので操作者に注意喚起を促すために赤色が、曲率が小さい位置では展開画像中の歪が大きくならないので青色が、曲率が中間的な位置には黄色がそれぞれ割り付けられる。
本表示例を図13に示す。本表示例では、表示装置6の画面1202に、部分的に透明度の異なる展開画像1300が表示される。なお、展開画像1300中の点線部は透明度を変えて表示された部分を表している。展開画像1300の透明度は曲率に応じて異なり、展開画像中の歪が大きくなる曲率が大きい位置では高い透明度が設定され、曲率の小さい位置では低い透明度が設定される。
本表示例を図14に示す。本表示例では、表示装置6の画面1202に、展開画像1200とグラフ1400が並べて表示される。グラフ1400は図10に示したものと同様であり、曲率と中心線位置との関係を示すものである。
表示例1~3では、偽像率である曲率を連続値として扱って展開画像を表示させているが、ステップS205において偽像率である曲率に対して閾値判定を行い、判定結果に基づいて展開画像を表示させても良い。閾値判定の結果に基づいて展開画像を表示させることにより、操作者が観察すべき箇所とそうでない箇所の区分けが容易になる。
CPU2は閾値を取得する。取得される閾値は、予め記憶装置4に記憶された値でも良いし、図16に示す閾値設定画面1600を用いて操作者が設定した上限値及び/又は下限値であっても良い。
CPU2はステップS151 で取得した閾値とS203で中心線位置毎に求められた曲率を比較し、曲率が閾値の範囲内にあるかどうかを判定する。判定の結果、曲率が閾値の範囲内にあればステップS153へ進み、範囲内になければ終了となる。
CPU2は曲率を表示装置6の画面1202に展開画像1200とともに表示させる。本ステップの表示例を図17に示す。本表示例では、展開画像1200とともに曲率表示バー1700が画面1202に表示される。曲率表示バー1700は曲率が閾値の範囲内にある箇所にバーが表示されるものであり、例えば曲率がステップS151で取得された閾値よりも大きい箇所にバーが表示される。
本表示例を図18に示す。本表示例では、表示装置6の画面1202に、展開画像1200がスクロール表示される。図18ではスクロール方向を左から右としているが、逆方向でも良い。本表示例のスクロール表示では、図15に示した閾値判定により閾値範囲内と判定された箇所のスクロール速度を高速にし、閾値範囲外と判定された箇所のスクロール速度を低速にして、展開画像1200がスクロール表示される。閾値判定の対象には、画面1202の横方向の中央部に表示される中心線位置の曲率を用いるのが、観察のしやすさの点から好ましい。
以上のように展開画像が表示されることにより、操作者は展開画像上の曲率の小さい箇所、すなわち偽像率が低い箇所に集中して観察することができ、展開画像に基づく画像診断の誤診を低減することができるようになる。
Claims (14)
- 被検体の管腔臓器の展開画像を作成する展開画像作成手段と、前記展開画像を表示する表示手段を備えた医用画像表示装置において、
前記展開画像中の位置に応じて当該位置の偽像率を算出する偽像率算出手段と、
前記偽像率を前記展開画像に対応付けて表示させる制御手段と、
を備えることを特徴とする医用画像表示装置。 - 被検体の管腔臓器の展開画像を作成する展開画像作成手段と、前記展開画像を表示する表示手段を備えた医用画像表示装置において、
前記展開画像中の位置に応じて当該位置の偽像率を算出する偽像率算出手段と、
前記偽像率に基づいて前記展開画像を表示させる制御手段と、
を備えることを特徴とする医用画像表示装置。 - 請求項1または2に記載の医用画像表示装置において、
前記偽像率算出手段は前記管腔臓器の長軸方向の曲がり度合いに基づいて前記偽像率を算出することを特徴とする医用画像表示装置。 - 請求項3に記載の医用画像表示装置において、
前記偽像率算出手段は、
前記管腔臓器の中心線データを取得する中心線データ取得手段と、
前記中心線上の位置に応じて前記曲がり度合いを算出する曲がり度合い算出手段と、
を有することを特徴とする医用画像表示装置。 - 請求項4に記載の医用画像表示装置において、
前記曲がり度合い算出手段は前記中心線上の点における接線ベクトルと当該点の近傍であって前記中心線上の点における接線ベクトルとを用いて求めた曲率及び曲率半径、当該点における前記管腔臓器の径のうちの少なくとも1つを用いて曲がり度合いを算出することを特徴とする医用画像表示装置。 - 請求項1に記載の医用画像表示装置において、
前記制御手段は前記偽像率に応じて異なる色を割り付けたカラーバーを作成し、前記カラーバーを展開画像中の位置に合わせて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項2に記載の医用画像表示装置において、
前記制御手段は前記偽像率に基づいて前記展開画像の少なくとも一部の透明度を変えて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項2に記載の医用画像表示装置において、
予め定められたしきい値と前記偽像率を比較する比較手段をさらに備え、
前記制御手段は前記比較結果に基づき前記展開画像を前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項8に記載の医用画像表示装置において、
前記制御手段は前記比較結果に基づき前記展開画像の少なくとも一部の透明度を変えて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項8に記載の医用画像表示装置において、
前記制御手段は前記比較結果に基づき前記展開画像の画面スクロール速度を変えて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項1に記載の医用画像表示装置において、
前記制御手段は前記偽像率に基づいてグラフを作成し、前記グラフを展開画像と並べて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 請求項1に記載の医用画像表示装置において、
予め定められたしきい値と前記偽像率を比較する比較手段をさらに備え、
前記制御手段は前記比較結果に基づき比較結果表示バーを作成し、前記比較結果表示バーを展開画像中の位置に合わせて前記表示手段に表示させることを特徴とする医用画像表示装置。 - 被検体の管腔臓器の展開画像を作成する展開画像作成ステップと、前記展開画像を表示する表示ステップを備えた医用画像表示方法において、
前記展開画像中の位置に応じて当該位置の偽像率を算出する偽像率算出ステップと、
前記表示ステップ偽像率を前記展開画像に対応付けて表示させる制御ステップと、
を備えることを特徴とする医用画像表示方法。 - 被検体の管腔臓器の展開画像を作成する展開画像作成ステップと、前記展開画像を表示する表示ステップを備えた医用画像表示方法において、
前記展開画像中の位置に応じて当該位置の偽像率を算出する偽像率算出ステップと、
前記偽像率に基づいて前記展開画像を表示させる制御ステップと、
を備えることを特徴とする医用画像表示方法。
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