M-mode ultrasound imaging of arbitrary paths
Systems and methods of M-mode ultrasound imaging allows for M-mode imaging along user-defined paths. In various embodiments, the user-defined path can be a non-linear path or a curved path. In some embodiments, a system for M-mode ultrasound imaging can comprise a multi-aperture probe with at least a first transmitting aperture and a second receiving aperture. The receiving aperture can be separate from the transmitting aperture. In some embodiments, the transmitting aperture can be configured to transmit an unfocused, spherical, ultrasound ping signal into a region of interest. The user-defined path can define a structure of interest within the region of interest.
1. A method of defining and displaying an M-mode path for display in an ultrasound imaging system, the method comprising:
transmitting a first unfocused ultrasound signal from a single transmitting transducer element into a region of interest including a structure of interest;
receiving echoes of the first unfocused ultrasound signal with a first group of receiving transducer elements;
receiving echoes of the first unfocused ultrasound signal with a second group of receiving transducer elements;
retrieving position data describing an acoustic position of the single transmitting transducer element, each element of the first group of receiving transducer elements, and each element of the second group of receiving transducer elements;
forming a first image by using the position data to calculate reflector positions for the echoes received with each of the elements of the first group of receiving transducer elements and coherently combining echo data received by the elements of the first group of receiving transducer elements;
forming a second image by using the position data to calculate reflector positions for the echoes received with each of the elements of the second group of receiving transducer elements and coherently combining echo data received by the elements of the second group of receiving transducer elements;
producing an improved-quality image of the region of interest from the received echoes by incoherently combining the first image and the second image;
displaying the improved-quality image of the region of interest including the structure of interest to a user;
defining an arbitrary one-pixel-wide path through the structure of interest; and
displaying a graph of a magnitude of pixels along the path over time.
2. The method of claim 1 , wherein the path is non-linear.
3. The method of claim 2 , wherein the path has at least one curved segment.
4. The method of claim 1 , wherein the path has at least one linear segment and at least one curved segment.
5. The method of claim 2 , wherein the path has at least two linear segments that intersect at an angle other than 180 degrees.
6. The method of claim 1 , wherein the path has at least two dis-continuous segments.
7. The method of claim 1 , wherein the transmitting transducer element lies on a separate physical transducer array from an array containing the first group of receiving transducer elements.
8. The method of claim 1 , wherein defining a path through the structure of interest is performed substantially concurrently with said transmitting and receiving.
9. A method of ultrasound imaging, comprising:
transmitting ultrasound signals into a region of interest and receiving echoes of the transmitted ultrasound signals with an ultrasound probe;
defining a first image window as a first portion of the region of interest;
identifying an M-mode path intersecting a feature visible in the first image window;
defining a second image window as a second portion of the region of interested that is different than the first image window; and
displaying the data representing the M-mode path from the first image window on a common display with a B-mode image of the second image window while a B-mode image of the first image window is not displayed;
wherein the second portion of the region of interest defining the second image window does not overlap any of the first portion of the region of interest defining the first image window.
10. The method of claim 9 , wherein all of the method steps are performed during a live real-time imaging session.
11. The method of claim 9 , wherein the M-mode path includes at least one non-linear segment.
12. The method of claim 9 , wherein the M-mode path is not a line intersecting the probe.
13. The method of claim 9 , wherein the M-mode path has at least two dis-continuous segments.