| Zugriffsnummer | 17628 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Measurement of the modulation transfer function of digital x-ray detectors with an opaque edge test device |
| Autor(in); Institution |
Illers, Hartmut; 4.2, Bild- und Wellenoptik, PTB-Braunschweig
Buhr, Egbert; 4.2, Bild- und Wellenoptik, PTB-Braunschweig
Günther-Kohfahl, Susanne; Philips Medical Systems, Hamburg, GERMANY
Neitzel, Ulrich; Philips Medical Systems, Hamburg, GERMANY
|
| Quelle/Jahr | Optimisation strategies in medical x-ray imaging : proceedings of a conference held in Malmö, Sweden, 23 - 25 April 2004. Radiation Protection Dosimetry: 114 (2005), 214 - 219 |
| Herausgeber(in) |
Mattsson, Sören
|
| ISSN | 0144-8420 |
| ISBN | 0-19-856887-8 |
| Verlag | Oxford: OUP |
| Konferenzangaben | Second Malmö Conference on Medical X-ray Imaging: Optimisation Strategies in Medical X-ray Imaging, Malmö, 23-25, April, 2004, Sweden |
| Zusammenfassung | A variant of the edge method for the determination of the presampled modulation transfer function (MTF) of digital X-ray imaging devices has been developed and accepted as the standard method in the novel DQE measurement standard IEC 62220-1. An opaque tungsten edge test device accomplishes the ideal step-like profile of the incident X-rays. The ESF is measured over a large region across the edge transition which enables an accurate MTF measurement including the "low frequency drop". The method has been applied to different state-of-the-art X-ray imaging detectors, a computed radiography (CR), a CsI-based indirect and a Se-based direct flat-panel detector. The MTF measurement results will be presented. In contrast to the opaque edge device, the commonly used semi-transparent edge test devices produce scatter radiation which deteriorates the incident X-ray profile which leads to a systematic over-estimation of the MTF. |
