Ultrasound color processing and tissue image enhancement
Color Ultrasound C.A.D. (Computer Aided Diagnosis)
Ultrasound color post-processing is a nonstandard ultrasound technique that
enhances particular differences of impedance when specific conditions are met.
It deploys unique algorithms for different echo environments. That enhances
interfaces that are hard to detect with standard grayscale ultrasound. This technique
has been in use since February 1994.
Why color will be
left click the picture to see why
same is with C.A.D. Color ultrasound
Neither ultrasound color processing nor power Doppler, nor any other medical
imaging technique assigns a unique color to every specific condition in all
environments. However, color processing does improve contrast resolution and
makes diagnosis easier.
Ultrasound Color Processing is not B-color (color filtering). Neither is it
the simple translation of the grayscale into colors. Ultrasound Color Processing
is the result of programmed algorithms applied to ultrasound pictures and for
different purposes. A similar process would be used for Ultrasound Color
Pre-processing. The next two images correspond to a grayscale obstetric
ultrasound (left) and its matching color post-processed image (right).
Structures are enhanced on the right image
Although Ultrasound Color Post-processing does not use Color Doppler, it is
similar in the sense that it enhances the displayed information. By doing
reverse engineer to the right Doppler image below converting it into a grayscale
Doppler image, it is seen that both pictures display the same information, but
the diagnosis is much easier by using color.
Both pictures display the same information but the right one makes diagnosis
Doppler cannot tell which vessel is an artery or which one is a vein. It just
tells which is the direction of the blood flow and qualifies with color its
velocity and the Doppler shift within specific limits.
We diagnose exactly the same pathology out of color Doppler images as we do
out of grayscale Doppler images. The difference is how easy and fast we can do
it. However, colors are not consistent with any diagnosis. They are just a way
to enhance specific events under specific circumstances.
One step ahead, the Ultrasound Color Pre-processing technique, under
development, aims to disclose tissue differences. Such differences will help us
find conditions whose diagnosis is now limited to biopsy or autopsy. The
sonographer would choose the options, like tissue to enhance, during the real
time examination. It could be done as post-processing, too.
Other branches of science that use color to improve contrast are: Astronomy,
Geology, Thermography, Radar, etc.
While you could get enough information from doing a grayscale, contrast,
bright and position analysis of a traffic light and decide out of it whether to
stop or go, the use of color certainly makes it easier.
The same is valid for medical ultrasound imaging, as shown in the images
below, where adenomyosis is displayed in light yellow in the right image.
The next step is ultrasound Color Pre-processing, under development, followed
by 3-D/4-D Ultrasound Color Pre-processing, and the aid of quantum computing.
Current technology is more than enough to develop ultrasound scanners for
Color Pre-processing. This technique will disclose new important medical
information, mainly tissue image enhancement.
Color pictures display more information than grayscale images because of a
simple fact: grayscale pictures are limited to the grayscale tones while color
pictures display the same number of grayscale tones plus a number of colors on
every image, improving contrast resolution.
Ultrasound Color Post-Processing was developed by Doctor Gonzalo Díaz Md.
Dr. Díaz is also developing Ultrasound Color Pre-Processing