Ultrasound Calibration and Real-Time Quality Assurance Based on Closed Form Formulation
AssigneeThe John Hopkins University
InventorsEmad M. Boctor, Gregory D. Hager, Gabor Fichtinger, Anand Viswanathan
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Abstract
Disclosed is a system and method for intra-operatively spatially calibrating an ultrasound probe. The method includes determining the relative changes in ultrasound images of a phantom, or high-contrast feature points within a target volume, for three different ultrasound positions. Spatially calibrating the ultrasound probe includes measuring the change in position and orientation of the probe and computing a calibration matrix based on the measured changes in probe position and orientation and the estimated changes in position and orientation of the phantom.
Claims21
A method for spatially calibrating an ultrasound probe, comprising:
- placing the ultrasound probe in a first position and orientation relative to a phantom;
- measuring the first position and orientation of the ultrasound probe;
- acquiring a first ultrasound image of the phantom;
- determining a first spatial relationship between a phantom reference frame and a pixel reference frame, based on the first ultrasound image;
- repositioning the ultrasound probe in a second position and orientation relative to the phantom;
- measuring the second position and orientation of the ultrasound probe;
- acquiring a second ultrasound image of the phantom;
- determining a second spatial relationship between the phantom reference frame and the pixel reference frame, based on the second ultrasound image;
- and
- computing a probe calibration matrix based on the first position and orientation of the ultrasound probe, the first spatial relationship, the second position and orientation of the ultrasound probe, and the second spatial relationship.
A system for performing intra-operative calibration of an ultrasound probe, comprising:
- a position and angle encoder for measuring a position and angle of the ultrasound probe;
- and
- a data system having a computer readable medium encoded with a program for computing a probe calibration matrix according to a closed form formulation, and according to a relative change between a first location in a first ultrasound image and a second location in a second ultrasound image, wherein the first ultrasound image corresponds to a first ultrasound probe position, and the second ultrasound image corresponds to a second ultrasound probe position.
Dependencies are inferred from the claim text.