CPC A61B 8/0841 (2013.01) [A61B 8/12 (2013.01); A61B 8/4245 (2013.01); A61B 8/4477 (2013.01); A61B 8/4483 (2013.01); A61B 8/5207 (2013.01); A61B 2017/3413 (2013.01)] | 20 Claims |
1. A system for determining a position of an interventional device, the system comprising:
an image reconstruction processor configured to reconstruct an ultrasound image corresponding to an image plane defined by an ultrasound imaging probe; and
a position determination processor configured to:
receive a model defining an expected variation of in-plane maximum intensity of a signal only as a function of time of flight of the signal, detect a maximum intensity ultrasound signal transmitted between the ultrasound imaging probe and an ultrasound transducer attached to the interventional device and detect an intensity of the maximum intensity ultrasound signal,
compute a lateral position of the ultrasound transducer relative to the image plane based on a time of flight of the maximum intensity ultrasound signal,
search the model in only one dimension to determine an expected in-plane maximum intensity for the maximum intensity ultrasound signal, wherein the one dimension is the time of flight of the maximum intensity ultrasound signal,
compute an out-of-plane distance between the ultrasound transducer and the image plane based on a comparison of the intensity of the maximum intensity ultrasound signal and the expected in-plane maximum intensity for the maximum intensity ultrasound signal,
determine the position of an interventional device relative to the image plane based on the out-of-plane distance and the lateral position, and
indicate the out-of-plane distance in the reconstructed ultrasound image.
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