= B-mode ultrasound scan
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A <B-mode ultrasound scan> maps echo strength to displayed brightness and assembles multiple <pulse-echo ultrasound> lines into a spatial image. Each echo's location is inferred from beam direction and return time using an assumed <sound speed>. <Ultrasound Theory Module by FAMUS>[The origin of the ultrasound image; Ultrasound modes, B–mode]{ref}
A bright point represents a strong received echo, not a direct measurement of tissue density. <Acoustic impedance> contrasts, propagation losses and the instrument's display mapping all affect brightness. A moving image consists of repeated spatial frames; in an <M-mode ultrasound scan>, the second display axis instead tracks time along one beam.
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