Health & Environmental Research Online (HERO)


Print Feedback Export to File
8175044 
Journal Article 
Digital imaging with solid-state x-ray image intensifiers 
Damento, MA; Radspinner, R; Roehrig, H 
1999 
Unk 
Proceedings of SPIE
ISSN: 0277-786X
EISSN: 1996-756X 
SPIE-INT SOC OPTICAL ENGINEERING 
BELLINGHAM 
PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) 
3770 
122-133 
WOS:000083637800014 
X-ray cameras in which a CCD is lens coupled to a large phosphor screen are known to suffer from a loss of x-ray signal due to poor light collection from conventional phosphors, making them unsuitable for most medical imaging applications. By replacing the standard phosphor with a solid-state image intensifier, it may be possible to improve the signal-to-noise ratio of the images produced with these cameras. The solid-state x-ray image intensifier is a multi-layer device in which a photoconductor layer controls the light output from an electroluminescent phosphor layer. While prototype devices have been used for direct viewing and video imaging, they are only now being evaluated in a digital imaging system In the present work, the preparation and evaluation of intensifiers with a 65 mm square format are described. The intensifiers are prepared by screen-printing or doctor blading the following layers onto an ITO coated glass substrate: ZnS phosphor, opaque layer, CdS photoconductor, and carbon conductor. The total thickness of the layers is approximately 350 mu m. 350VAC at 400Hz is applied to the device for operation For a given x-ray dose, the intensifiers produce up to three times the intensity (after background subtracting) of Lanex Fast Front screens. X-ray images produced with the present intensifiers are somewhat noisy and their resolution (CTF) is about half that of Lanex screens. Modifications are suggested which could improve the resolution and noise of the intensifiers. 
image intensifier; x-ray; solid state; photoconductor 
Barber, HB; Roehrig, H; 
0-8194-3256-3 
Conference on Medical Applications of Penetrating Radiation 
DENVER, CO