5 June 2003 New design of a structured CsI(Tl) screen for digital mammography
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Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003); doi: 10.1117/12.480249
Event: Medical Imaging 2003, 2003, San Diego, California, United States
Abstract
Columnar CsI(Tl) screens are now routinely used for digital x-ray imaging in a wide variety of applications such as mammography, dental radiography, and non-destructive testing. While commercially available CsI(Tl) screens exhibit excellent properties, it is possible to significantly improve their performance. Here, we report on a new design of a columnar CsI(Tl) screen. Specifically, columnar CsI(Tl) screens were subjected to mechanical pixelation for minimizing the long range spread of scintillation light within the film, thus enhancing spatial and contrast resolution, and increasing the detective quantum efficiency (DQE(f)) of the digital imaging detector. To date we have fabricated up to 200 μm thick pixelated CsI(Tl) screens for mammography, and characterized their performance using a CCD camera. This paper presents a comparison of the new pixelated CsI(Tl) screens, conventional columnar CsI(Tl) screens, and Gd2O2S(Tb) screens. The data show that pixelated screens substantially improve the DQE(f) of the digital imaging system.
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Vivek V. Nagarkar, Sameer V. Tipnis, Valeriy B. Gaysinskiy, Stuart R. Miller, Andrew Karellas, Srinivasan Vedantham, "New design of a structured CsI(Tl) screen for digital mammography", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480249; https://doi.org/10.1117/12.480249
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KEYWORDS
X-rays

Spatial resolution

Imaging systems

Digital mammography

Modulation transfer functions

Sensors

X-ray imaging

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