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US 11,950,950 B2Granted
Zoom detection and fluoroscope movement detection for target overlay
AssigneeCovidien LP
InventorsAriel Birenbaum, Oren P. Weingarten, Irina Shevlev, Guy Alexandroni
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Abstract
Systems and methods for visualizing navigation of a medical device with respect to a target using a live fluoroscopic view. The methods include determining a level of zoom of a fluoroscope when acquiring a reference frame. The methods further include determining whether the live fluoroscopic images evidence movement of the fluoroscope relative to its position when capturing a reference frame.
Claims12
A method of determining a level of zoom in a fluoroscopic image, comprising:
- capturing a fluoroscopic reference frame;
- calculating an interval between radio opaque markers in the reference frame;
- calculating an expected interval between the radio opaque markers for a plurality of levels of zoom;
- identifying the expected interval that most closely matches the calculated interval in the reference frame;
- applying a transform based on the identified expected interval;
- and
- overlaying a location of a target on a live fluoroscopic image based on a result of applying the transform.
4 more elements
A system for detecting movement of a fluoroscope, comprising:
- a fluoroscopic imaging device;
- a plurality of radio opaque markers disposed in a reference frame of the fluoroscope;
- a workstation in operative communication with the fluoroscope, the workstation including a memory and at least one processor, the memory storing instructions, which when executed by the processor, is configured to:
- capture a fluoroscopic reference frame;
- calculate an interval between the radio opaque markers in the reference frame;
- calculate an expected interval between the radio opaque markers for a plurality of levels of zoom;
- identify the expected interval that most closely matches the calculated interval in the reference frame;
- apply a transform based on the identified expected interval;
- and
- overlay a location of a target on a live fluoroscopic image based on a result of applying the transform.
7 more elements
Dependencies are inferred from the claim text.