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          Institute: MPI für medizinische Forschung     Collection: Abteilung Biophysik     Display Documents

ID: 22815.0, MPI für medizinische Forschung / Abteilung Biophysik
New high-DQE Imaging Plate scanner using the reflected readout laser signal for noise corrections
Translation of Title:New high-DQE Imaging Plate scanner using the reflected readout laser signal for noise corrections
Authors:Bele, Petra; Ochs, Rainer; Angert, Isabel; Schröder, Rasmus R.
Date of Publication (YYYY-MM-DD):2000-05
Title of Journal:Microscopy Research and Technique
Journal Abbrev.:Microscopy Research and Technique
Issue / Number:3
Start Page:281
End Page:291
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Imaging Plates (IPs) are in principle ideal electron detectors combining a large active layer area with a high sensitivity, linear dynamic range detection over 5 orders of magnitude. A moderate resolution and a decreasing detection quantum efficiency (DQE) for higher electron doses limit their use so far. The decrease of the DQE results from linear noise contributed by readout laser instabilities and inhomogeneities of the IP active layer. Here we present data on a new IP drum scanner prototype. This scanner combines twin channel amplification electronics with a new type of readout laser which allows a smaller readout focus and increased stability. The current nominal pixel size is 25 m, and the measured modulation transfer function (MTF) indicates that further reduction of the scanning step size down to pixel sizes in the range of 12-15 m should be possible. A unique feature of the new scanner is the simultaneous recording of the reflected readout laser light. The reflected light signal can be used for a posteriori alignment of repeated scans of one individual IP and for a correction of one part of the high spatial frequency noise contribution (reflected light correction). The posteriori alignment now allows an easy conventional gain normalization of the luminescence signal without using special markers on the IP. Both corrections lead to an increase of the DQE for high electron doses.
Free Keywords:Imaging Plate; scanner; reflected light; readout laser; high DQE; gain normalization; SNR correction
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Biophysik/
Identifiers:URI:http://www3.interscience.wiley.com/cgi-bin/abstrac... [Abstract]
URI:http://download.interscience.wiley.com/cgi-bin/ful... [Fulltext PDF]
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