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lüll Physical and clinical evaluation of a 2,048 x 2,048-matrix image intensifier TV digital imaging system in bone radiography Higashida Y; Baba Y; Hatemura M; Yoshida A; Takada T; Takahashi MAcad Radiol 1996[Oct]; 3 (10): 842-8RATIONALE AND OBJECTIVES: To evaluate the potential utility of a 2,048 x 2,048-matrix image intensifier television digital radiography (DR) system versus a conventional screen-film (S-F) system for bone radiography. METHODS: Basic imaging properties were evaluated including resolution properties, Wiener spectra, and detectabilities of low-contrast signals. DR images were obtained with the same exposure (iso-dose) or one-third the exposure (low-dose) used with the S-F system. The visibility of pathologic details of metastatic disease on bone radiographs of 27 patients was evaluated subjectively by six radiologists. RESULTS: Resolution properties of the DR system were slightly superior to those of the S-F system at low-frequency range, but the S-F system showed considerably higher resolution properties at the high-frequency range. The noise levels for iso-dose DR were slightly greater than those for S-F imaging at low spatial frequency; however, low-dose digital radiographs showed higher noise levels. Visibility of details of diagnostic features on bone radiographs was similar with both systems, but the low-dose digital radiographs were slightly inferior. CONCLUSION: High-resolution image intensifier television DR systems may be clinically useful for bone radiography.|Bone Neoplasms/diagnostic imaging/secondary[MESH]|Bone and Bones/*diagnostic imaging[MESH]|Female[MESH]|Humans[MESH]|Middle Aged[MESH]|Phantoms, Imaging[MESH]|Pubic Bone/diagnostic imaging[MESH]|Radiation Dosage[MESH]|Radiographic Image Enhancement/*instrumentation[MESH]|Television[MESH]|X-Ray Intensifying Screens[MESH] |