MEDICAL IMAGING
instruments. ‘Te main challenge is keeping the cost down, because you don’t have to go to real surgery,’ explained Van Kuijk. ‘It allows for a business model that is closer to the patient, at a doctor’s office for example. But the closer you get, the lower cost point of these systems must be − these offices that monitor patients cannot afford to have machines that are hundreds of thousands of dollars or Euros,’ he continued. ‘Terefore, building a vision system that is in line with the cost of these systems is challenging.’
Looking to CMOS As with many other market sectors, camera manufacturers are moving towards CMOS sensors for ophthalmology applications in order to achieve higher resolutions and speeds. ‘Tere is a shiſt going on right now, because CMOS is getting to be equal or better than CCD quality. With CMOS you have the ability to increase resolution with speed – much higher than what is possible with CCD,’ noted Van Kuijk. ‘Frame speed is important because you want real-time imaging while a surgeon is looking at the images. Te latest camera that we have − the Quartz a180 − can take 12-megapixel pictures at 180 frames per
In wavefront analysis the pixels (black dots) are compared with reference points of an ideal imaging lens (yellow points)
second. CCD will never reach those speeds.’ CCD sensors, however, still provide
Hamamatsu_Swiss_189x129_Layout 1 16/01/2015 09:06 Page 1
advantages, according to Baumer’s Zipprich- Rasch: ‘CCD sensors still have some benefits, for example when capturing low light and if you go to long exposure times − CCDs have less noise and you can capture less light with longer exposure times.’
The perfect partners for dual colour imaging But although Baumer’s TX camera series
contain CCD sensors, in the future, the company may look to CMOS as the higher speeds and sensitivity will be advantageous for opticians carrying out wavefront analysis, Zipprich-Rasch said. ‘CMOS sensors are more sensitive, so you can capture more photons in a shorter time, but they are noisier − so as
W-VIEW GEMINI NEW
Optics for simultaneous dual wavelength imaging by one camera. Matched to the performance of Gen II sCMOS cameras Chromatically corrected User-defined filter combinations Easily aligned, optically and mechanically stable
ORCA-Flash4.0 LT
The benefits of sCMOS technology at the price of a CCD. 30 frames/second at 4.2 megapixel resolution USB 3.0 connectivity Robust synchronisation
W-VIEW Mode - independent exposure of each half of the sensor for two-colour imaging
www.hamamatsucameras.com
Baumer
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