Ultrasound devices methods and systems
Ultrasound methods, devices, and systems are described which support a useful compromise in terms of spatial resolution and temporal resolution for capturing motion in tissue structures. Tissue engineering articles, methods, systems, and devices which employ ultrasound to deliver biological agents to selected regions of a tissue scaffold, deliver mechanical stimulation to cells growing in a tissue scaffold, and enhance the perfusion of fluids through tissue scaffolds.
1. A method for estimating properties of motion of a body structure using ultrasound, comprising:
using a controller of an ultrasound machine;
receiving a first input signal from a user interface representing data indicating a sampling rate and storing sampling rate data responsive thereto;
receiving a second input signal from a user interface data indicating a motion estimation frequency and storing motion estimation frequency data responsive thereto;
responsively to the sampling rate and motion estimation frequency data; scanning the body structure using ultrasound to generate a series of image frames at the sampling rate, each image representing the configuration of the body structure at a point in time and spanning a field of view of an ultrasound scanner;
the scanning the body structure including capturing displacements of portions of the body structure within a fraction of the field of view at the motion estimation frequency;
estimating a time-dependent configuration of the body structure within the entirety of the field of view and combining with the motion estimation to outputting an image sequence showing representations of the image frames as a video sequence with the motion data responsive to the displacements superposed thereon.
2. The method of claim 1 wherein the time difference between the successive transmits used to capture motion estimation data is selected responsively to a predicted quality of the motion estimates based on strain in the body structure.
3. The method of claim 1 wherein the time difference between the successive transmits used to capture motion estimation data is selected responsively to a predicted quality of the motion estimates based on strain in the body structure and random error.
4. The method of claim 1 wherein the time difference between the successive transmits used to capture motion estimation data is selected responsively to a predicted quality of the motion estimates based on an optimum responsive to a random signal component and a competing distortion of the motion estimation resulting from strain, i.e., motion other than pure displacement.
5. A system for estimating properties of motion of a body structure using ultrasound, comprising:
an ultrasound scanner;
an ultrasound driver;
a data acquisition element;
a programmable processor with a user interface having a display and a computer readable medium;
an ultrasound probe connected to the ultrasound driver and data acquisition element and the programmable processor;
the computer readable medium comprising software instructions, the software instructions defining a procedure for operating at least the ultrasound probe, ultrasound driver, and data acquisition element in order to execute the method comprising:
receiving a first input signal from the user interface representing data indicating a sampling rate;
receiving a second input signal from the user interface data indicating a motion estimation frequency;
scanning the body structure using ultrasound to generate a series of image frames at the sampling rate, each image representing the configuration of the body structure at a point in time and spanning a field of view of the ultrasound scanner;
the scanning including capturing displacements of portions of the body structure at the motion estimation frequency;
outputting a result of said scanning in the form of an image sequence showing representation of the image frames as a video sequence with motion data responsive to the displacements superposed thereon.