SPI_통합영어2.

Front

During an abdominal ultrasound study, which control most closely affects patient exposure?

Back

Output power

Answer explanation

Output power adjusts the strength of transmitted energy, directly influencing patient exposure.

Front

What effect will you see in the image if you increase the reject level?

Back

Decreased low-level echoes

Answer explanation

Rejection removes low-amplitude echoes, cleaning up noise but possibly losing weak signals.

Front

If sound did not attenuate with increasing depth, what system control would you no longer need?

Back

TGC

Answer explanation

TGC (Time Gain Compensation) exists to correct for attenuation with depth; without attenuation, it becomes unnecessary.

Front

Signal-to-noise ratio

Back

The relative amplitude of the signal to the noise

Answer explanation

Signal-to-noise ratio (SNR) refers to signal strength relative to background noise.

Front

What receiver function converts the negative portion of the RF signal to positive?

Back

Rectification

Answer explanation

Rectification removes the negative component of RF signals to make all values positive.

Front

Preprocessing functions may be defined as:

Back

Done before echo data are stored

Answer explanation

Preprocessing occurs before data are stored and must be done in real-time.

Front

How does increasing the dynamic range setting affect the ultrasound image?

Back

Decreasing image contrast

Answer explanation

A wider dynamic range lowers contrast because more echo levels are displayed.

Front

When you adjust the TGC, what component of the ultrasound system implements the changes?

Back

Receiver

Answer explanation

TGC (Time Gain Compensation) adjustments are processed within the receiver to amplify signals by depth.

Front

Typical duty factor in diagnostic sonographic imaging.

Back

0.1%–1%

Answer explanation

Diagnostic ultrasound uses pulsed waves with very low duty factors, typically 0.1%–1%.

Front

Pulse repetition period is the inverse of:

Back

Pulse repetition frequency

Answer explanation

Pulse repetition period (PRP) = 1 / PRF. They are mathematical inverses.