As part of the AMSD program, Kodak must demonstrate the ability of our system to perform at these very cold temperatures. NGST will be an IR based optical system that will operate at cryogenic temperatures. Matthews, Gary Hammon, John Barrett, David Russell, Kevin (Technical Monitor) Measurements of the presampling MTF with the two slit types have shown that a correction factor can be applied to compensate for transmission through the relief edges. Within the clinically relevant exposure range (0.3-3 mR), the resulting DQE for the Kodak plates ranged between 20%-50% lower than for the corresponding Fuji plates. The noise power studies indicated a higher level of noise for the Kodak images (approximately 20% at the low exposure levels and 40%-70% at higher exposure levels). The results show that both systems are comparable in resolution performance. A comparison of the slit type ('beveled edge' versus 'straight edge') and its effect on the resulting MTF measurements was also performed. The presampling MTF was determined from the Fourier transform (FT) of the system's finely sampled line spread function (LSF) as produced by a narrow slit. The NPS was determined from two-dimensional Fourier analysis of uniformly exposed plates. The DQE at four exposure levels (30, 3, 0.3, 0.03 mR) and two plate types (standard and high resolution) were calculated from the NPS and MTF measurements.

To maximize comparability, the same measurement techniques and analysis methods were used. The modulation transfer function (MTF), noise power spectra (NPS), and detective quantum efficiency (DQE) of the Kodak Digital Science computed radiography (CR) system (Eastman Kodak Co.-model 400) were measured and compared to previously published results of a Fuji based CR system (Philips Medical Systems-PCR model 7000). The performance characteristics of a photostimulable phosphor based computed radiographic (CR) system were studied. Performance characteristics of a Kodak computed radiography system.īradford, C D Peppler, W W Dobbins, J T

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