Christie stars in first EU 3D dental surgery transmission

3D images of dental surgery in Spain were transmitted over fibre optic cable to an auditorium where two Christie Mirage HD14K-M projectors relayed the event onto a Harkness screen.

Christie was a technological partner in the first 3D dental surgery to be transmitted live in Europe. The event, which used two Christie Mirage HD14K-M projectors, took place in Madrid during a training symposium organised by Carl Zeiss and COEM (the Official College of Dental Surgeons of Madrid).

The operation was held in a surgical theatre within COEM’s installations and was transmitted live via fibre optic to the 400 experts in attendance in the college’s auditorium. The two Christie Mirage projectors, equipped with zoom lens, relayed the event onto a high-performance Harkness Hall screen with a gain level of 2.4 installed in the auditorium.

The transmission and visualisation of the surgical operation was entrusted to 3D Experiences, a company with proven experience in transmitting and producing 3D stereoscopic content.

The quality of the image and of the 3D was the main issue around which the engineering of the event was based. The transmission of the image used a single fibre optic cable with various channels to extract all the necessary signals, thus minimising risks and unneeded equipment that would hamper the surgical operation.

The Zeiss OPMI Pentero 800 system, one of the most advanced 3D microscopes in the market, was used for the surgery together with a Trenion 3D-HD module, a high-definition stereoscopic video device that allows surgeons to share 3D images effectively.

The two Christie Mirage projectors operated simultaneously to create a passive 3D projection, using warping techniques to match the 3D image pixel by pixel. The whole event was carried out in dual stream mode, offering a native resolution of 1920 x 1080 for each eye without compression, double the information received on the microscope’s 3D screen.

“The majority of stereoscopic events use compressed 3D signals with side-by-side format,” said Enrique Criado, the project supervisor. “The process of compressing two signals into the space of one degrades the quality of the image by up to 50 percent, which means that when you need large screens, the result is clearly deficient and generally very disappointing.”

“We, on the other hand, work with uncompressed images and double channel. In other words, we take the maximum advantage of the quality offered by our client’s microscope. In this case, the quality of the image was greater than the surgeon’s 3D monitor, and close to the optical quality of the 3D Zeiss microscope. That’s why the experts viewing the operation were absolutely delighted with the visual experience, which they said was comparable to that of the surgeon’s in the actual operation.”

In addition, 3D Experiences used a SIP (Stereo Image Processor) system to revise and correct any imperfection that might arise from the 3D image, while at once equalising and colour grading both signals with broadcast quality, and simultaneously feeding to the two Christie Mirage projectors. All this was carried out in realtime and in dual stream mode, without compromising quality.

The use of 3D in medicine is highly demanding, as the disparity of the image can be two or three times that of a conventional 3D movie in the cinema. “For this reason, the perfect adjustment can provide a much more comfortable visual experience, zero stress and zero visual fatigue. Christie technology not only offers exceptional image quality, but also the possibility of pixel perfect 3D adjustment with zero level of disparity in any area of the screen,” Criado said.

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