Dr. Paul Leblans Profile

Dr. Paul Leblans

at Agfa HealthCare NV

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Proceedings Article | 28 June 2001 Paper

New needle-crystalline CR detector

Paul Leblans, Luc Struye, Peter Willems

Proceedings Volume 4320, (2001) https://doi.org/10.1117/12.430885

KEYWORDS: Chromium, X-rays, Scanners, Modulation transfer functions, Absorption, Image quality, Photomultipliers, Optical filters, Copper, Scintillators

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The storage phosphor RbBr:Tl⁺ can be grown in needles via vacuum deposition. Thanks to reduced lateral light diffusion thick needle screens still offer acceptable resolution. Due to its low intrinsic X-ray absorption, however, a RbBr:Tl⁺ needle screen does not lead to a better absorption/resolution compromise than a BaFBr_1-xI_x:Eu²⁺ powder screen. CsBr:Eu²⁺ does combine high specific X-ray absorption and the possibility of needle growth. Its blue emission, peaking at 440 nm and near IR stimulation band, with maximum at 685 nm, make it well suited for use in CR systems. Sensitivity and sharpness of a 500 (mu) thick CsBr:Eu²⁺ needle screen were measured in a flying-spot scanner. The number of photostimulated light quanta per absorbed X-ray quantum is higher than for BaFBr_1-xI_x:Eu²⁺. At 70 kVp and 0.5 mm Cu filtration, equal sharpness is obtained for 85% vs. 46% X-ray absorption in BaFBr_1-xI_x:Eu²⁺ screens. DQE was measured at 2.5 (mu) Gy, 70 kVp, and 0.5 mm Cu filtration for a CsBr:Eu²⁺ needle screen in a flying-spot scanner. Up to 3 lp/mm, DQE was 2 times higher than for state-of-the-art CR systems and equal to the DQE claimed for flat panel DR systems, based on a-Si photodiodes combined with a CsI:Tl scintillator layer.

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