Development of a 512-Channel Module for Digital X-Ray Imaging Systems with Silicon Strip Detectors

Journal Article · Mon Aug 11 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2979276· OSTI ID:21149277

Bolanos, L; Cabal, A E ^[1]; Grybos, P; Maj, P; Swientek, K; Szczygiel, R ^[2]; Marzari, A ^[3]; Prino, F ^[4]; Ramello, L ^[5]

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1. CEADEN, Havana (Cuba)
2. AGH University of Science and Technology, Cracow (Poland)
3. Universitas degli Studi di Torino (Italy)
4. INFN, Torino (Italy)
5. DISTA, Universita del Piemonte Orientale and INFN, Alessandria (Italy)

We present the development of a 512-channel module for high counting rate digital X-ray imaging systems. The module consists of 512 silicon micro-strips equipped with 8 64-channel readout ASICs called DEDIX. The detectors of 300 {mu}m thickness have strips with 100 micron pitch and strip length of 1 or 2 cm. Detectors were designed with the possibility of choosing the cutting edge distance from the active area in the range from 60 {mu}m down to 20 {mu}m. To obtain good detection efficiency at the relevant energies (10-50 keV) the module works in edge-on configuration: strips are oriented parallel to the incoming X-ray beam. The DEDIX ASIC has a binary readout architecture. Each channel is built of a charge sensitive amplifier (CSA) with pole-zero cancellation circuit, a shaper, two independent discriminators and two independent 20-bit counters. Internal correction DAC implemented in each channel independently ensures a low spread of discriminator effective threshold. This module has been characterized for noise and matching performance having in mind possible future applications like dual energy mammography and angiography. An equivalent noise charge is below 210 el rms for a 1 cm long strip detector and below 250 el. rms for 2 cm long strip detector with 100 {mu}m pitch. The spread of discriminator effective threshold for 512 channels is 16 el. rms, while the high counting rate performance has been demonstrated by the measurement up to 1 MHz average rate of input signals per single channel.

• OSTI ID: 21149277
• Journal Information: AIP Conference Proceedings, Vol. 1032, Issue 1; Conference: 10. Mexican symposium on medical physics, Mexico City (Mexico), 17-19 Mar 2008; Other Information: DOI: 10.1063/1.2979276; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AMPLIFIERS
BIOMEDICAL RADIOGRAPHY
BLOOD VESSELS
COUNTING RATES
DIGITAL-TO-ANALOG CONVERTERS
DISCRIMINATORS
EFFICIENCY
INTEGRATED CIRCUITS
KEV RANGE
MAMMARY GLANDS
MHZ RANGE
NMR IMAGING
NOISE
PERFORMANCE
RADIOTHERAPY
READOUT SYSTEMS
SI MICROSTRIP DETECTORS
SIGNALS
X-RAY DETECTION