MTF evaluation of a phosphor-coated CCD for x-ray imaging.
A novel digital x-ray detector has been assembled. The imaging system is based on a phosphor-coated charge-coupled device (CCD) obtained by direct deposition of a gadolinium oxysulphide scintillator onto the detector surface. The modulation transfer function has been measured along the two directions of the digital coordinates with the narrow slit technique. A resolution limit of about 20 line pairs per mm has been obtained for both directions. The high spatial resolution currently demanded in mammography can be achieved with this imaging system.
Gambaccini
M
M
Dipartimento di Fisica Università di Ferrara, Italy.
Taibi
A
A
Del Guerra
A
A
Marziani
M
M
Tuffanelli
A
A
D004867:Equipment Design; D005260:Female; D015902:Gamma Cameras; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000379:methods; D011859:Radiography / Q000295:instrumentation* / Q000379:methods; D012588:Scintillation Counting; D014965:X-Rays