DynAMITe: a wafer scale sensor for biomedical applications

Esposito, M. and Anaxagoras, Thalis and Allinson, N. and Speller, R. and Konstantinidis, A. and Fant, A. and Wells, K. and Osmond, F. and Evans, M. and Speller, D. and Allinson, Nigel (2011) DynAMITe: a wafer scale sensor for biomedical applications. Journal of Instrumentation, 6 . c12064. ISSN UNSPECIFIED

Full content URL: http://dx.doi.org/10.1088/1748-0221/6/12/C12064

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Item Type:Article
Item Status:Live Archive

Abstract

In many biomedical imaging applications Flat Panel Imagers (FPIs) are currently the most common option. However, FPIs possess several key drawbacks such as large pixels, high noise, low frame rates, and excessive image artefacts. Recently Active Pixel Sensors (APS) have gained popularity overcoming such issues and are now scalable up to wafer size by appropriate reticule stitching. Detectors for biomedical imaging applications require high spatial resolution, low noise and high dynamic range. These figures of merit are related to pixel size and as the pixel size is fixed at the time of the design, spatial resolution, noise and dynamic range cannot be further optimized. The authors report on a new rad-hard monolithic APS, named DynAMITe (Dynamic range Adjustable for Medical Imaging Technology), developed by the UK MI-3 Plus consortium. This large area detector (12.8 cm × 12.8 cm) is based on the use of two different diode geometries within the same pixel array with different size pixels (50 μm and 100 μm). Hence the resulting device can possess two inherently different resolutions each with different noise and saturation performance. The small and the large pixel cameras can be reset at different voltages, resulting in different depletion widths. The larger depletion width for the small pixels allows the initial generated photo-charge to be promptly collected, which ensures an intrinsically lower noise and higher spatial resolution. After these pixels reach near saturation, the larger pixels start collecting so offering a higher dynamic range whereas the higher noise floor is not important as at higher signal levels performance is governed by the Poisson noise of the incident radiation beam. The overall architecture and detailed characterization of DynAMITe will be presented in this paper. © 2011 IOP Publishing Ltd and SISSA.

Additional Information:Medical Imaging 2012: Physics of Medical Imaging: San Diego, CA, 4th February 2012
Keywords:Active area, Active Pixel Sensor, Breast biopsies, Breast cancer diagnosis, Breast tissues, CMOS APS, Digital detector, Digital x-ray detector, Intelligent imaging, Key characteristics, Large area sensors, Low noise, Medical imaging technology, Metal-oxide, Scientific applications, Specific materials, Wide dynamic range, X-ray diffraction measurements, X-ray diffraction studies, breast biopsy, large area image sensors, mammography, x-ray diffraction
Subjects:F Physical Sciences > F350 Medical Physics
B Subjects allied to Medicine > B800 Medical Technology
Divisions:College of Science > School of Computer Science
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http://purl.org/dc/terms/referenceshttp://eprints.lincoln.ac.uk/7260/
ID Code:7265
Deposited On:15 Jan 2013 13:12

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