Which statement best describes beam nonuniformity when there is a pronounced hot spot?

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Multiple Choice

Which statement best describes beam nonuniformity when there is a pronounced hot spot?

Explanation:
A pronounced hot spot means one area of the beam has much higher intensity than the rest. In ultrasound terminology, spatial peak intensity (SPI) is the maximum intensity in the beam, while spatial average intensity (SAI) is the average across the beam. When a hot spot is present, that maximum intensity rises above the average, so SPI is greater than SAI. The ratio SPI/SAI, which reflects beam nonuniformity, becomes greater than 1. If the beam were perfectly uniform, SPI would equal SAI; if SAI exceeded SPI, you’d have a trough rather than a hot spot.

A pronounced hot spot means one area of the beam has much higher intensity than the rest. In ultrasound terminology, spatial peak intensity (SPI) is the maximum intensity in the beam, while spatial average intensity (SAI) is the average across the beam. When a hot spot is present, that maximum intensity rises above the average, so SPI is greater than SAI. The ratio SPI/SAI, which reflects beam nonuniformity, becomes greater than 1. If the beam were perfectly uniform, SPI would equal SAI; if SAI exceeded SPI, you’d have a trough rather than a hot spot.

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