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Back-Illuminated Photodiode (BIP)

White Paper
Philips CT Marketing Philips Healthcare

Ready for 40 slices and beyond

The number of slices that can be achieved in multislice CT is limited by conventional 2-D photodiodes. Limitations arise due to the number of wirebonds that transmit data between the photodiode elements and the detector electronics. The wirebond density at the edge of a conventional photodiode makes it a challenge to construct a CT detector capable of more than 32 channels.

 

Taking these limitations into consideration, Philips has designed a Back Illuminated Photodiode (BIP) that removes the bottlenecks caused by conventional photodiodes. BIP eliminates the need for wirebonds to link the photodiode to the electronics.

 

Instead, a conductive epoxy is used between the photodiode and the substrate - data is passed through the substrate to the electronics. In effect, BIP eliminates the slice limit, making Brilliance CT ready for 40 slices and beyond.

 

The BIP is easily tiled in two dimensions, allowing for hundreds of slices. With this, we are no longer limited in the number of slices or the volume of coverage afforded by the photodiode. This aspect of the technology allows it to be ready for truly large area CT detection systems.

 Conventional detector technology Philips' patented BIP
Conventional detector technology
Philips' patented BIP

Benefits of BIP technology

Back Illuminated Photodiode technology improves dose efficiency results from shorter signal paths:

  •  Better signal integrity and higher signal-to-noise ratio
  •  Geometric efficiency - no traces on top of silicon

 

The slice limit is no longer an issue:

  •  No wirebond bottleneck
  •  Tileable detectors allow for hundreds of slices
  •  Solves flat panel challenge with conventional detector materials

 



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Brilliance 40-channel, Brilliance 64-channel
Brilliance Version 1.2, dose
 

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