Evaluation of colour images printed by a thermal dye diffusion process

Area of Science:

• Medical Imaging
• Diagnostic Ultrasound
• Print Technology

Background:

• Traditional medical image printing often involves photochemicals.
• Advancements in dry printing technology offer potential alternatives.
• Thermal dye diffusion is a key principle in some dry printing systems.

Purpose of the Study:

• To evaluate the performance of the Drystar thermal dye diffusion system for medical image printing.
• To compare Drystar output with laser films, matrix films, and glossy paper in color-coded Doppler examinations.
• To assess various image quality parameters and overall handiness of the printed medical images.

Main Methods:

• The Drystar system was evaluated using color-coded Doppler examinations of carotid arteries.
• 25 patients for color tests and 37 for black-and-white tests were included.
• Performance was assessed against laser films, matrix films, and glossy paper on criteria including grayscale, color scale, vascular coloring, registration, and artifacts.

Main Results:

• Drystar showed significant improvement (p=0.00005) in registration, grayscale, spectral resolution, and vascular coloring compared to other methods.
• The overall handiness score for Drystar color film was 96%.
• Radiologists preferred Drystar color hard copies over glossy paper prints, though blue-base and clear-base films were rated inferior to laser films, leading to the inclusion of a double line print mode.

Conclusions:

• The Drystar system demonstrates high performance in printing medical images from color-coded Doppler examinations.
• Its superior quality in key parameters and user preference highlight its potential in diagnostic imaging.
• Further refinements, like the double line print mode, enhance its competitiveness with established film technologies.