News Column

Patent Issued for Optimization of Multiple Candidates in Medical Device Or Feature Tracking

August 6, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- A patent by the inventors Peng, Renbin (San Jose, CA); Wang, Peng (Princeton, NJ); Chen, Terrence (Princeton, NJ); Comaniciu, Dorin (Princeton Junction, NJ), filed on April 29, 2011, was published online on July 22, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8787635 is assigned to Siemens Aktiengesellschaft (Munich, DE).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The present embodiments relate to identifying a location of a medical device or feature in an image.

"The position of the catheter(s), other medical devices, or features may be determined in images. Such online tracking or position detection may be used in many applications, such as visual surveillance and real-time image guided interventions. However, due to complexity of the application environments, there is high possibility that the detection in the images may drift or be inaccurate due to missing detections, false alarms, occlusion, background noises, and other unpredictable factors.

"2D X-ray fluoroscopy is routinely used for vascular interventions and for cardiac catheterization. Fluoroscopy is used for real-time monitoring of the procedure and catheter location visualization. However, 2D fluoroscopic images lack detailed anatomical information due to the incapability of X-ray in distinguishing among soft tissues. In order to augment the doctor's visualization of the body anatomy, for example, in the arterial fibrillation procedures, Intracardiac Echo (ICE) is used as an intra-operative modality to provide real-time cross-sectional ultrasound images.

"In fluoroscopy, there are many types of devices of interest. For example, one is the guiding catheter, and another is the intravascular ultrasound (IVUS) catheter. In interventions, both the guiding catheter tip and IVUS catheter are undergoing breathing motions. In additional, the devices can be connected to each other. There can be motions between them. For example, the IVUS catheter is also being pulled back through a guiding catheter during the intervention. Precisely tracking both IVUS catheter and guiding catheter tips has important applications, such as in the co-registration of IVUS and angiography images. However, inaccuracies in detection of these devices may lead to inaccuracies in the applications."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "By way of introduction, the preferred embodiments described below include methods, systems, instructions, and computer readable media for determining a first location of a first medical device or feature in imaging or optimizing multiple candidates in medical device or feature tracking. Possible locations of the medical device or feature for each of a plurality of different times are received. The possible locations are modeled using a probability function. An iterative solution to obtain the maximum of the probability function determines the possible location to be used as the location of the medical device or feature for each time. Where two or more medical devices or features are provided with a geometric relationship, such as being connected by a detected guide wire, the probability function may account for the geometric relationship, such as a geodesic distance between the possible locations for the two medical devices.

"In a first aspect, a method is provided for determining a first location of a first medical device in imaging. A plurality of first candidate locations of a first medical device for each of a plurality of frames of medical data representing a patient is obtained. A plurality of second candidate locations of a second medical device for each of the plurality of the frames of the medical data is obtained. A processor identifies the first location of the first medical device in each of the frames. The first location is identified from the first candidate locations for the respective frame. The identification is solved iteratively as a function of a probability function. The probability function is a function of the location of first and second candidate locations, and distances between the first and second candidate locations. An indication of the first location is output for at least one of the frames.

"In a second aspect, a non-transitory computer readable storage medium has stored therein data representing instructions executable by a programmed processor for optimizing multiple candidates in medical device or feature tracking. The storage medium includes instructions for receiving a plurality of detected positions of a medical device or feature for each of a plurality of image frames representing a patient, and selecting one of the detected positions in each of the image frames, the selecting iteratively solving, for each of the image frames, a probability function based on the detected positions in the image frame and a neighborhood of other image frames.

"In a third aspect, a system is provided for optimizing multiple candidates in medical device tracking. A memory is operable to store data representing a region, at different times, of a patient and a catheter in the region. A processor is configured to calculate a location of the catheter in the region as represented by the data. The location is calculated by optimizing from a plurality of possible locations in the data at the different times in a Markov random chain. The optimizing uses iterated conditional modes to maximize posterior probabilities of the Markov random chain. A display is operable to display the location as calculated for each of the different times.

"The present invention is defined by the following claims, and nothing in this section should be taken as a limitation on those claims. Further aspects and advantages of the invention are discussed below in conjunction with the preferred embodiments and may be later claimed independently or in combination."

URL and more information on this patent, see: Peng, Renbin; Wang, Peng; Chen, Terrence; Comaniciu, Dorin. Optimization of Multiple Candidates in Medical Device Or Feature Tracking. U.S. Patent Number 8787635, filed April 29, 2011, and published online on July 22, 2014. Patent URL:

Keywords for this news article include: Siemens Aktiengesellschaft.

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Source: Journal of Engineering

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