Question

Ultrasound of how much frequency is beamed into the human body for sonography?
A. 15-30 MHz
B. 1-15 MHz
C. 45-70 MHz
D. 30-45 MHz
E. 1-18 MHz

Answer 1

Hint: Ultrasound is a sound that is having a frequency higher than the upper audible limit of human hearing. The low frequencies give images of less resolution but deep images into a human body.

Complete answer:
A typical diagnostic sonographic scanners operate in the frequency range of 1 to 18 MHz
The choice of frequency is between a spatial resolution of image and image depthing.
The lower frequencies give images of less resolution but deep images into a human body.

Therefore, the answer of the above question is option (E) 1-18 MHz.

Note:
Ultrasound has a frequency more than the usual ones which is audible to the human ear. It is usually greater than approximately 20 MHz .Ultrasound typically used in clinical settings is somewhere between 2-12 MHz.
High frequency ultrasound is used in order to generate an image of high axial resolution.
Ultrasound can be passed through various mediums like gases, solids, liquids except in vacuum.
 Increasing the number of waves of compression and rarefaction for a given distance can more accurately discriminate between two separate structures along the axial plane of wave propagation.
The advantages of using ultrasound scanning is immense. It is having a very high success rate, safe performance of blocks, direct visualizations of neuronal and adjacent anatomical structures.
The disadvantages of ultrasound scanning are very few but it is still present. The disadvantages include as the ultrasound doesn’t travel well in air it would not have effective imaging body parts that have gas present in them or hidden by bones like head.