What happens to a B-mode image without post processing filters? What happens to a B-mode image without envelope detection? Solution 1) It is often necessary to do a wide variety of post processing to form the best quality ultrasound images before displaying the information for human observation. This post processing might include various techniques and the order depend on the system configuration. The key task involved in post processing is conversion of raw data into displayed data. >> For speckle reduction, various methods such as wavelet decomposition, anisotropic fitering and bilateral filtering can be applied. These techniques follow spatial compounding which is a multi imaging method where, by combining views of the same object from different angles, each having an uncorrelated speckle realization, the resulting image will have significantly reduced speckle. >> Lowpass and Highpass fitering techniques are apllied for obtaining smoothening and for higlighting the edges respectively. >> Histogram eualization is typically used to improve image contrast and quality, and involves doing a gray level transformation to obtain a uniform histogram from images with un-balanced histograms. To conclude, the B-mode imaging without these post processing techniques makes impossible human intrepretation and observation. 2) The amplitude of the reflected sound waves forms the basis for the ultrasound image at its focal point location. Envelope detection along with log compression is used to detect the peaks in the received signal and to reduce the dynamic range of the received signals for efficient display. Once all of the amplitudes for all of the focal points have been detected, they can be displayed for analysis by the doctor or technician. The B-mode imaging without envelope detection allows all reflected ultrasound waves for post procesing that leads to a reconstruction a noisy image which is useless for diagnosis..

1. What happens to a B-mode image without post processing filters?
What happens to a B-mode image without envelope detection?
Solution
1) It is often necessary to do a wide variety of post processing to form the best quality ultrasound
images before displaying the information for human observation. This post processing might
include various techniques and the order depend on the system configuration. The key task
involved in post processing is conversion of raw data into displayed data.
>> For speckle reduction, various methods such as wavelet decomposition, anisotropic fitering
and bilateral filtering can be applied. These techniques follow spatial compounding which is a
multi imaging method where, by combining views of the same object from different angles, each
having an uncorrelated speckle realization, the resulting image will have significantly reduced
speckle.
>> Lowpass and Highpass fitering techniques are apllied for obtaining smoothening and for
higlighting the edges respectively.
>> Histogram eualization is typically used to improve image contrast and quality, and involves
doing a gray level transformation to obtain a uniform histogram from images with un-balanced
histograms.
To conclude, the B-mode imaging without these post processing techniques makes impossible
human intrepretation and observation.
2) The amplitude of the reflected sound waves forms the basis for the ultrasound image at its
focal point location. Envelope detection along with log compression is used to detect the peaks in
the received signal and to reduce the dynamic range of the received signals for efficient display.
Once all of the amplitudes for all of the focal points have been detected, they can be displayed
for analysis by the doctor or technician.
The B-mode imaging without envelope detection allows all reflected ultrasound waves for post
procesing that leads to a reconstruction a noisy image which is useless for diagnosis.