Sensor Solution On A Single Chip: ams OSRAM Provides High-resolution Images For Medical And Security Computed Tomography

News Facts:

• With its on-chip photodiodes, ams OSRAM’s AS5951 offers a cost-effective solution for 32-slice detectors of Computed Tomography scanners in the price-sensitive market segment
• Thanks to the monolithic integration of the A/D converter, the photodiode array and the voltage reference into one single component, the AS5951 facilitates system development and reduces the cost of materials
• Low noise performance and low photodiode leakage current ensure high image quality and low dose performance

 

With its on-chip photodiodes, ams OSRAM’s AS5951 offers a cost-effective solution for 32-slice detectors of Computed Tomography scanners in the price-sensitive market segment

Next generation sensor chip

 

 

The AS5951 has two modes of operation: high-resolution mode and low dose mode. In the high-resolution mode, a maximum noise of 0.30 fC is achieved for an input current range of 200 nA. In low dose mode, two pixels are binned to a larger pixel at a noise level of 0.43 fC, which improves signal-to-noise performance and allows a dose level reduction. The high linearity of ±600 ppm, including photodiode, also ensures artefact-free images.The minimum integration time of 200 µs allows fast CT detector rotations. The digital data readout can be accessed via the SPI interface.

 

In addition, self-heating is reduced with a maximum power dissipation of 67.2 mW per sensor in low dose mode, which decreases cooling costs. To produce a CT module, the AS5951 can be mounted directly on a substrate using a wire bonding process. In combination with low cost substrate materials, the AS5951 provides a cost effective module solution for CT detectors. This is key to increasing access to diagnostic CT imaging around the globe.

 

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