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OBJECT TRACKING DEVICE

外国特許コード F190009831
整理番号 S2017-0464-C0
掲載日 2019年7月24日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP007873
国際公開番号 WO 2018159775
国際出願日 平成30年3月1日(2018.3.1)
国際公開日 平成30年9月7日(2018.9.7)
優先権データ
  • 特願2017-041111 (2017.3.3) JP
発明の名称 (英語) OBJECT TRACKING DEVICE
発明の概要(英語) Provided is an object tracking device that comprises: a superimposed image creation unit (C6) that creates a plurality of superimposed images (26) in which each of a plurality of images of untracked objects not including tracking object image characteristics is superimposed on a tracking object section image (23) that includes tracking object image characteristics (21); a discriminator creation unit (C9) that creates a discriminator by learning at least the image characteristics of the tracking object or the position thereof on the basis of the plurality of superimposed images (26); and a tracking object identification unit (C12) that, on the basis of the discriminator and a tracked image (28) that includes the image characteristics of the tracking object and of an obstacle, identifies at least the image characteristics of the tracking object or the position thereof in the tracked image (28). As a result of the foregoing, the object tracking device makes it possible for the location of the tracking object to be identified more easily without being affected by obstacles, as compared to the image tracking methods based on the template matching of the prior art.
従来技術、競合技術の概要(英語) BACKGROUND ART
In the case of performing treatment such as radiation therapy, the subject's respiration or heart beat (patient) and the like, the position of the treatment of the target object is moved (such as a tumor), radiation in the portion other than the target object is not irradiated (normal tissues) in order to, X-ray fluoroscopic image is captured in real-time tracking of the target object and its position is determined, the radiation of the target object as the irradiation position is moved only when the radiation needs to be irradiated. In addition, the captured image of the target object identifying and tracking the position of the irradiation position of the radiation induced technique, induced by the object tracking technique is a so-called image, X-ray fluoroscopic image is typically used, but are not limited to this. For example, X-ray fluoroscopic image as well, ultrasonic image, MRI(Magnetic Resonance Imaging: nuclear magnetic resonance imaging) image, image CT (Computed Tomography), PET(Positron Emission Tomography: positron emission tomography) image can also be used. The position of the target object as a technique for tracking, is known the following techniques.
Patent Document 1 (Patent Publication 5610441) is, by the X-ray fluoroscopy is assumed at the time of tracking the marker-less tracking performance degradation, the complementary information of the outside of the described technology. That is, a lesion such as cancer treatment including a target object based on the template image, at the time of treatment of a therapeutic target for detecting the position of the X-ray image in each frame by the perspective processing of pattern matching, as a therapeutic target position from the preset irradiation position within the predetermined error range, and, due to respiration or the like (pseudo-periodic) motion of the substantially periodic irradiation in order to minimize the deviation, suitable as the application timing (the surface which is set based on the movement of) the time (phase) within a window of the therapeutic radiation irradiated to the target tracking technique. In addition, in Patent Document 1, in order to improve the accuracy of the determination of the position of a therapeutic target, such as a bone or a different therapeutic target for the diaphragm as position information in reference to the non-tracking object, as described in the pattern matching may be performed.
Patent Document 2 (Patent Publication 3053389) is, a metal marker is inserted into the patient's body in the vicinity of the X-ray fluoroscopy technique to increase the tracking accuracy of the tracking of the tumor has been described. That is, embedded in the vicinity of the target tumor therapeutic target for treatment of the tumor marker from a plurality of directions in the X-ray perspective view of the solid-state imaging device, the tracking target (tumor) registered in advance in the template image and a grayscale of the marker is subjected to template matching by the normalized cross-correlation, the position of the tumor marker 3 specified by the two-dimensional technique are described.
Patent Document 3 (Patent Publication 4505639) is, in the same manner as Patent Document 2 is subjected to template matching by the gray-scale normalized correlation between the position of the tumor marker, the time-series position data may be acquired in advance, from the data acquired in advance, to estimate the location of a tumor marker at the current time is a technique.
Patent Document 4 (International Publication No. JP-2015/125600) is, obtained by continuous X-ray image, created for different respiratory phases by executing the template matching, the position of the treatment target portion in each breathing phase specific to the technology. In the technique described in Patent Document 4, the treatment target portion and the position of the reference respiratory phase, respiratory phase of a plurality of consecutive three-dimensional treatment target site in the X-ray image data 3, respiratory phase different between the X-ray image of the treatment target portion and the deformation amount, the treatment target portion in each respiratory phase and acquires the position of the template was created.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • UNIVERSITY OF TSUKUBA
  • 発明者(英語)
  • TERUNUMA Toshiyuki
  • SAKAE Takeji
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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