Question

Discuss the advantages and disadvantages of B-mode and M-mode ultrasound imaging techniques.

Answer 1

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B-Mode is a two-dimensional ultrasound image display composed of bright dots representing the ultrasound echoes. The brightness of each dot is determined by the amplitude of the returned echo signal. This allows for visualization and quantification of anatomical structures, as well as for the visualization of diagnostic and therapeutic procedures for small animal studies.

M-mode examines a line of Motion over time. Using M-mode in echocardiography displays the movement of the myocardium allowing for accurate and real-time measurements of wall thickness, internal diameter, and heart rate. It is from these parameters that many systolic parameters are derived (i.e. fractional shortening, ejection fraction, chamber volumes, etc.).

M-mode is useful in:

Echocardiography
Coronary artery measurements
Vessel diameters
Calculating heart rate manually

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