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Computed radiography utilizing laser-stimulated luminescence: Detectability of simulated low-contrast radiographic objects

1988; Elsevier BV; Volume: 12; Issue: 3 Linguagem: Inglês

10.1016/0895-6111(88)90025-0

1879-0771

Yoshiharu Higashida, Nobuyuki Moribe, YUKINORI HIRATA, Katsuyuki Morita, Seishi Doudanuki, Yoshio Sonoda, Noboru Katsuda, Yasuhiro Hiai, Wataru Misumi, Masanori Matsumoto, Senya Yoshioka, Mutsumasa Takahashi,

Ocular and Laser Science Research

Threshold contrasts of low-contrast objects with computed radiography (CR) images were compared with those of blue and green emitting screen-film systems by employing the 18-alternative forced choice (18-AFC) procedure. The dependence of the threshold contrast on the incident X-ray exposure and also the object size was studied. The results indicated that the threshold contrasts of CR system were comparable to those of blue and green screen-film systems and decreased with increasing object size, and increased with decreasing incident X-ray exposure. The increase in threshold contrasts was small when the relative incident exposure decreased from 1 to 1/4, and was large when incident exposure was decreased further.