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       Dr Gonzalo E. Díaz M  - Ultrasound - Telemedicine             




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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 always better

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 easier

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