Ogata Yuji, Naito Hiroaki, Tomiyama Noriyuki, Hamada Seiki, Tsubamoto Mitusko, Inoue Atsuo, Murai Sachiko, Sumikawa Hiromitu, Ueguchi Takashi, Matsumoto Mitsuhiro, Tamura Shinichi, Nishinosono Hiroyuki, Nakamura Hironobu, Johkoh Takeshi
Department of Medical Physics, Osaka University Graduate School of Medicine, Yamadaoka 1-7, Suita, Osaka 565-0871, Japan.
Radiat Med. 2006 Jun;24(5):351-7. doi: 10.1007/s11604-006-0041-2.
The aim of this study was to evaluate the usefulness of novel color digital summation radiography (CDSR) for detecting solitary pulmonary nodules on chest radiographs by observers with different levels of experience.
A total of 30 healthy controls and 30 patients with newly detected solitary pulmonary nodules were evaluated. Six radiologists and five residents evaluated three image sets: set A, current and prior radiographs only; set B, set A with temporal subtraction images; and set C, set A with CDSR. The observers were asked to rate each image set using a continuous rating scale. In addition, the reading time required for each set was recorded.
The radiologists showed no significant differences in the mean A(z) value between set A, set B, and set C. However, the residents showed significant differences between set A and set B and between set A and set C. In addition, for set B and set C, the mean reading time per case of all readers was significantly shorter than that for set A.
The detection capability of observers with little experience is comparable to that of experienced observers when reading radiographs with temporal subtraction images or with CDSR. The usefulness of CDSR is comparable to that of temporal subtraction.
本研究旨在评估新型彩色数字叠加放射成像（CDSR）对不同经验水平的观察者在胸部X线片上检测孤立性肺结节的有效性。
共评估了30名健康对照者和30名新发现孤立性肺结节的患者。6名放射科医生和5名住院医师评估了三组图像：A组，仅包括当前和先前的X线片；B组，A组加上时间减影图像；C组，A组加上CDSR。要求观察者使用连续评分量表对每组图像进行评分。此外，记录每组所需的阅片时间。
放射科医生在A组、B组和C组之间的平均A(z)值无显著差异。然而，住院医师在A组和B组之间以及A组和C组之间存在显著差异。此外，对于B组和C组，所有阅片者每例的平均阅片时间明显短于A组。
经验不足的观察者在阅读有时间减影图像或CDSR的X线片时，其检测能力与经验丰富的观察者相当。CDSR的有效性与时间减影相当。
