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Motion Tracking / Motion Compensation in Interventional Procedures

IP.com Disclosure Number: IPCOM000197196D
Original Publication Date: 2010-Jul-14
Included in the Prior Art Database: 2010-Jul-14
Document File: 2 page(s) / 83K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

In the field of interventional procedures, e.g. embolization of tumors in the liver, a correct position of three-dimensional overlays, which got extracted from at least three-dimensional scans, has to be ensured during the intervention. The correct position of these three-dimensional overlays is crucial because the extracted information from the three-dimensional scans serves as a guideline for navigating medical devices. This means the physician depends on the overlay accuracy in order to steer his devices. The correct position of the three-dimensional overlays is influenced by movements of the patient, especially by breathing. Three-dimensional information, extracted from a scan, does only reflect the situation of one point in the breathing cycle. If a scan got acquired in one moment of intake of breath, the corresponding overlay is only valid for this moment of intake of breath.

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Motion Tracking / Motion Compensation in Interventional Procedures

Idea: Stefan Lautenschläger, DE-Forchheim

In the field of interventional procedures, e.g. embolization of tumors in the liver, a correct position of three-dimensional overlays, which got extracted from at least three-dimensional scans, has to be ensured during the intervention. The correct position of these three-dimensional overlays is crucial because the extracted information from the three-dimensional scans serves as a guideline for navigating medical devices. This means the physician depends on the overlay accuracy in order to steer his devices.

The correct position of the three-dimensional overlays is influenced by movements of the patient, especially by breathing. Three-dimensional information, extracted from a scan, does only reflect the situation of one point in the breathing cycle. If a scan got acquired in one moment of intake of breath, the corresponding overlay is only valid for this moment of intake of breath.

Up to now, there are some solutions to take care about the movements caused by breathing. The two most common methods are the Interactive Breath-Hold Control and the tracking of inserted landmarks. The Interactive Breath-Hold Control gets positioned in front of the patient and shows the status of the breathing cycle. A red LED signals the phase of inhalation and a green LED signals the phase exhalation (LED: Light Emitting Diode). A patient uses these lights to regulate his breath rhythm. However, this solution requires that a patient has to be awake and has to be able to control his breath by himself. Tracking of inserted landmarks means that the movements get tracked during the procedure. The problems of this method are that additional devices are needed to be inserted, a biplane acquisition system is needed to reach online tracking and only structures can be tracked and adopted which are close to the inserted landmarks.

In the following, an optimized method for tracking and adapting variations of three-dimensional overlays, triggered by breathing motion, are described. The description of this solution is split into two parts. At first, data have to be collected and compiled in a reasonable format. This had to be performed only one time. Secondly, these data will be used for clinical interventions. This means that the generic results, which got acquired in advance, get transferred for specific clinical cases. Following, these two parts are described more fully below.

At first, a generic three-dimensional map of a patient is gener...