Speaker
Mr
Andrea Fant
(Rutherford Appleton Laboratory)
Description
The I-ImaS (Intelligent Imaging Sensors) is an EU project whose
objective is to design and develop intelligent imaging sensors and
evaluate their use within an adaptive medical imaging system,
specifically tailored to Mammography and Dental Radiology. The
system will employ an in-line scanning technology approach and
proposes the use of CMOS active pixels sensors. The I-Imas system
will have the capability of processing the data on every pixel and
be able to dynamically respond in real time to changing conditions
during imaging recording.The result will be to minimise the
radiation exposure to areas of low diagnostic information content
while extracting the highest diagnostic information from regions of
high interest.
We have developed a 1.5D CMOS active pixel sensor to be used in
conjunction with a scintillator for X-ray detection. Multiple
sensors will be aligned to form a line-scanning system. Each sensor
contains a 512 by 32 array of pixels and the electronics to convert
the collected amount of charge to a digital output value. These
include programmable gain amplifiers (PGA) and analogue to digital
converters (ADC). The gain of the PGA can be switched between one or
two, to increase the sensitivity for smaller collected charge; the
ADC is a 14-bit successive approximation that runs at 20MHz, with a
sampling rate of 1.25MHz.
The ASIC also includes a programmable column fixed pattern noise
mitigation circuit and a digitally controllable pixel reset mode
block.
Here we will describe the sensor design and the simulated
performance.
Primary author
Mr
Andrea Fant
(Rutherford Appleton Laboratory)
