Virtual endoscopic image generated using an opacity curve
First Claim
1. A projection image generation apparatus, comprising:
- a virtual endoscopic image generator that generates, based on three dimensional data representing an interior of a subject having a lumen captured by an imaging device, a virtual endoscopic image, which is a pseudo three dimensional image, for visualizing an interior of the lumen by volume rendering;
an opacity curve setter that sets, in the virtual endoscopic image generator, an opacity curve which defines a relationship between pixel values of the three dimensional data and opacity values and is used in the volume rendering;
a viewpoint position setter that sets a viewpoint position corresponding to a camera position of the virtual endoscopic image within the interior of the lumen in the virtual endoscopic image generator, and is capable of setting different viewpoints in the extension direction of the lumen; and
a movement amount determination device that determines a movement amount of the opacity curve for the viewpoint position set by the viewpoint position setter with respect to the opacity curve at a reference viewpoint position in the case that the viewpoint position set by the viewpoint position setter is changed in the extension direction of the lumen from the reference viewpoint position, after the change in the viewpoint position,wherein a viewpoint position change is made by the viewpoint position setter, the opacity curve setter automatically moves the opacity curve at the reference viewpoint position by the movement amount determined by the movement amount determination device for the viewpoint position after the change, and sets the moved opacity curve in the virtual endoscopic image generator.
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Abstract
In generating a virtual endoscopic image, an interior of a lumen is made viewable even when the viewpoint position is changed. A virtual endoscopic image generation element generates a virtual endoscopic image by volume rendering based on three-dimensional data. An opacity curve setting element sets an opacity curve which defines the relationship between pixel values of the three-dimensional data and opacity values. A viewpoint position setting element sets a viewpoint position of a virtual endoscopic image. A movement amount determination element determines a movement amount of the opacity curve with respect to an opacity curve at a reference viewpoint position. When a virtual endoscopic image is generated by the virtual endoscopic image generation element, the opacity curve setting element sets an opacity curve obtained by moving the opacity curve by the determined movement amount in the virtual endoscopic image generation element.
55 Citations
20 Claims
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1. A projection image generation apparatus, comprising:
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a virtual endoscopic image generator that generates, based on three dimensional data representing an interior of a subject having a lumen captured by an imaging device, a virtual endoscopic image, which is a pseudo three dimensional image, for visualizing an interior of the lumen by volume rendering; an opacity curve setter that sets, in the virtual endoscopic image generator, an opacity curve which defines a relationship between pixel values of the three dimensional data and opacity values and is used in the volume rendering; a viewpoint position setter that sets a viewpoint position corresponding to a camera position of the virtual endoscopic image within the interior of the lumen in the virtual endoscopic image generator, and is capable of setting different viewpoints in the extension direction of the lumen; and a movement amount determination device that determines a movement amount of the opacity curve for the viewpoint position set by the viewpoint position setter with respect to the opacity curve at a reference viewpoint position in the case that the viewpoint position set by the viewpoint position setter is changed in the extension direction of the lumen from the reference viewpoint position, after the change in the viewpoint position, wherein a viewpoint position change is made by the viewpoint position setter, the opacity curve setter automatically moves the opacity curve at the reference viewpoint position by the movement amount determined by the movement amount determination device for the viewpoint position after the change, and sets the moved opacity curve in the virtual endoscopic image generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A projection image generation method, comprising using a computer to perform the steps of:
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generating based on three-dimensional data representing an interior of a subject having a lumen captured by an imaging device, a virtual endoscopic image, which is a pseudo three-dimensional image, for visualizing an interior of the lumen by volume rendering; and displaying the virtual endoscopic image on a display, wherein when a viewpoint position of the virtual endoscopic image, which corresponds to a camera position of the virtual endoscopic image within the interior of the lumen and is capable of setting different viewpoints in the extension direction of the lumen, is changed, an opacity curve defines a relationship between pixel values of the three-dimensional data and opacity values, and is used in the volume rendering, is automatically moved from the opacity curve at a reference viewpoint position in the case that the viewpoint position set by the viewpoint position setter is changed in the extension direction of the lumen from the reference viewpoint position, after the change in the viewpoint position in accordance with the change of the viewpoint position and the moved opacity curve is used to generate the virtual endoscopic image at the viewpoint position after the change. - View Dependent Claims (17, 18, 19)
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20. A non-transitory computer readable recording medium on which is recorded a program for causing a computer to perform the step of generating, based on three-dimensional data representing an interior of a subject having a lumen captured by an imaging device, a virtual endoscopic image within an interior of the lumen and is capable of setting different viewpoints in the extension direction of the lumen, which is a pseudo three-dimensional image, for visualizing the interior of the lumen by volume rendering,
wherein the program causes the computer to perform the step of moving an opacity curve which defines the relationship between pixel values of the three-dimensional data and opacity values, and is used in the volume rendering from an opacity curve at a reference viewpoint position in the case that the viewpoint position is changed in the extension direction of the lumen from the reference viewpoint position, after the change in the viewpoint position, and corresponding to a camera position of the virtual endoscopic image, and setting the moved opacity curve as the opacity curve used for generating the virtual endoscopic image.
Specification