What are the three main types of ultrasound modes?

The three main types of ultrasound modes are A-mode, B-mode, and Doppler mode.

A-mode, or amplitude modulation, provides a one-dimensional display of the ultrasound signal, represented as spikes or peaks on a graph. This mode is primarily used in ophthalmology to measure the distance of structures within the eye. It allows for precise measurement but does not provide a visual image of the anatomy.

B-mode, or brightness modulation, is the most commonly used mode in clinical practice. It produces two-dimensional images by displaying the echo amplitude as different brightness levels on the screen. This mode helps in visualizing anatomical structures and is essential for diagnostic imaging.

Doppler mode specifically focuses on measuring the motion of objects, such as blood flow. It employs the Doppler effect to provide information on the velocity of moving structures, making it crucial for evaluating cardiovascular conditions. This mode can depict both qualitative and quantitative data about blood flow.

While other choices may include terms related to ultrasound techniques, they do not accurately identify the primary modes used in diagnostic ultrasound, thus highlighting the significance of A-mode, B-mode, and Doppler mode in the field.