What is dynamic range compression in ultrasound?

Dynamic Range (also known as Compression) allows you to tell the ultrasound machine how you want the echo intensity displayed as shades of gray. A smaller/narrow range will display fewer shades of gray and appear as a higher contrast with a more black-and-white image.

What is dynamic range in ultrasound physics?

Dynamic range refers to the ratio of the largest and smallest signal levels at any particular processing stage. The total dynamic range of detected echo signals can exceed 150 dB. The signal range resulting from depth-dependent amplification may still be 50–60 dB or greater.

What is compression ultrasound physics?

Dynamic range is the range of amplitudes from largest to the smallest echo signals that an ultrasound system can detect. Compression is the process of decreasing the differences between the smallest and largest echo-voltage amplitudes; the optimal compression is between 2 and 4 for a maximal scale equal to 6.

How is physics used in ultrasound?

Understanding the basic physics of ultrasound is essential for acute care physicians. Medical ultrasound machines generate and receive ultrasound waves. Brightness mode (B mode) is the basic mode that is usually used. Ultrasound waves are emitted from piezoelectric crystals of the ultrasound transducer.

What do you mean by dynamic range?

Dynamic range (abbreviated DR, DNR, or DYR) is the ratio between the largest and smallest values that a certain quantity can assume. It is measured either as a ratio or as a base-10 (decibel) or base-2 (doublings, bits or stops) logarithmic value of the difference between the smallest and largest signal values.

What does dynamic range compression do?

Dynamic range compression (often shortened to just “compression”) is a process that limits the volume range of a piece of music. This means that rather than have passages that are almost inaudibly quiet of ear-splittingly loud, a piece of music will slot entirely into a preset volume range.

How hard is sonography physics?

Many trainee sonographers find physics and technology difficult. Even at school level, physics is often seen as a ‘hard’ subject and not pursued to a higher level.

Why do we use ultrasound physics?

Echo sounding High frequency sound waves can be used to detect objects in deep water and to measure water depth. The time between a pulse of sound being transmitted and detected and the speed of sound in water can be used to calculate the distance of the reflecting surface or object.

Does ISO affect dynamic range?

At high ISO, sensors with analog gain typically lose one stop of dynamic range for each stop increase in ISO. As a result, the full dynamic range is captured regardless of ISO choice, and ISO can be specified after the exposure. ISO only affects how the RAW data is interpreted.

What is game dynamic range?

Dynamic range is the difference of loudness of every sound in the game. So the difference between footsteps (low) and gunfire (high/loud). Footsteps are obviously not as loud as a gunshot. So Maximum dynamic range is going to reproduce that more realistic level of loudness.

Is dynamic range compression good?

Professionals say that compression should be used on each individual track, then if needed, over the final track as a whole. Dynamic range is good because it adds flair, nuance, and color to audio. Compression is used to illustrate that where musicians want it to be, and that’s done by reducing variation elsewhere.