Wednesday, November 11, 2009

Dexela Launches Sensitive Large Area X-Ray Imagers

Dexela introduces a family of large area flat panel CMOS X-ray detectors based on an innovative CMOS sensor design that combines fast speed and superior image quality.

The Dexela detector family’s main components are: CMOS image sensor, scintillator (structured CsI or Gadox), control electronics, readout electronics and communications with the workstation.

The Dexela CMOS image sensor consists of a photodiode array with a pixel size of 75µm. The sensor has very low dark current and read noise, with high linearity and consistency of response. A range of models is offered with the model number based on the active area: 1207 (115mm x 65mm), 1512 (145mm x 115mm), 2315 (230mm x 145mm), 2321 (230mm x 210mm), 2923 (290mm x 230mm), and 2923MAM (290mm x 230mm). The detector is capable of multi-resolution readout with dynamically adjustable binning at 1x2, 2x2, 1x4, 2x4 and 4x4. For the largest model in the range, the frame rate ranges from 26fps at full resolution (75µm) to 86fps binned 4x4 (300µm pixel pitch) over the whole active area of 29cm x 23cm.

The high fill factor, efficiency and low noise of the sensor combine to produce a high DQE of 0.70 at a skin dose of only 280µGy. This results in lower patient dose and said to be superior in image quality when compared to TFT-based detectors with significantly lower DQE.

Previously Dexela told that its X-ray image sensors are the largest commercially avaliable ones and are composed of tiled CMOS dice.


  1. Chairman is Peter Denyer, founder of VLSI Vision Ltd., now ST. I always thought VVL was a class operation and the kind of competitor that made Photobit a better company. Glad to see Peter is still in the game.

  2. Did they help you increase your profits?

  3. Thanks to Eric for the compliment, which I am very happy to return. Those were great times indeed!

  4. Did Dexela design the image sensor themselves?


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