Hiroaki Kudoh

Clinical evaluation of digital radiography based on a large-area cesium iodide-amorphous silicon flat-panel detector compared with screen-film radiography for skeletal system and abdomen

Abstract. The aim of this clinical study was to compare the image quality of digital radiography using the new digital Bucky system based on a flat-panel detector with that of a conventional screen-film system for the skeletal structure and the abdomen. Fifty patients were examined using digital radiography with a flat-panel detector and screen-film systems, 25 for the skeletal structures and 25 for the abdomen. Six radiologists judged each paired image acquired under the same exposure parameters concerning three observation items for the bone and six items for the abdomen. Digital radiographic images for the bone were evaluated to be similar to screen-film images at the mean of 42.2%, to be superior at 50.2%, and to be inferior at 7.6%. Digital radiographic images for the abdomen were judged to be similar to screen-film images at the mean of 43.4%, superior at 52.4%, and inferior at 4.2%; thus, digital radiographic images were estimated to be either similar as or superior to screen-film images at over 92% for the bone and abdomen. On the statistical analysis, digital radiographic images were also judged to be preferred significantly in the most items for the bone and abdomen. In conclusion, the image quality of digital radiography with a flat-panel detector was superior to that of a screen-film system under the same exposure parameters, suggesting that dose reduction is possible with digital radiography.

Basic evaluation of physical characteristics and clinical study of new digital subtraction angiography system with a large-area flat-panel detector

Authors could have a clinical experience to use an angiographic system incorporating FPD. This system possesses both FPD and I.I.-CCD detectors and is capable of conducting imaging in the same geometry for both detectors. We made measurement of basic physical characteristics of this system and visual evaluation using arteriographies of lower limbs processed by IVDSA, and confirmed that FPD is an excellent detector in angiographic examination. In the foreseeable future, angiographic system will be replaced by FPD system.