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【medical-news】Lung CT CAD boosts performance of less expe
11/27/2006
By: Erik L. Ridley
CHICAGO - Computer-aided detection (CAD) systems can help radiologists with minimal and moderate experience in detecting lung nodules on chest CT scans, according to researchers from the University of Maryland, Baltimore.
"Chest CT CAD is valuable to assist radiologists of all experience levels to detect lung nodules," said Dr. Charles White. "The increase in sensitivity appears to benefit most of those radiologists with the least amount of experience.
White presented the team's findings Monday at the 2006 RSNA meeting.
To evaluate the use of CAD as a second reader to detect lung nodules on chest CT scans, the researchers obtained 110 cases from four different sites. The study population included 64 women and 46 women with an average age of 58.6. There were 23 smokers, 63 nonsmokers, and 24 with unknown smoking status.
Nine cases were produced from a four-slice CT scanner (GE Healthcare, Chalfont St. Giles, U.K.), 69 cases were contributed by a 16-slice CT scanner (Philips Medical Systems, Andover, MA), and 32 cases were generated by a 40-slice system (Philips). Slice thicknesses varied from 0.9 mm to 3 mm, and there was variation in both acquisition protocols and clinical indications for the exams, White said.
Inclusion criteria included a technically acceptable quality of a clinically indicated chest CT scan, 10 or fewer actionable nodules, slice thickness less than 3 mm, and a contiguous or overlapping scan, according to White.
In the first part of the study, three radiologists with more than 10 years of experience in reading chest scans read the studies, and identified all nodules between 4 mm and 30 mm in maximum diameter. The 108 total nodules identified by all radiologists were used as the reference standard for the study.
CAD software (Philips) was then applied. Three radiologists with varying levels of experience then reviewed studies both with and without CAD findings.
The first reader (less than two years of experience reading chest CT scans) found 69 nodules (63.9%) without CAD and 77 (71.3%) with CAD, while the second reader (greater than two years but less than five years of experience) found 73 nodules (67.6%) without CAD and 83 (76.9%) with CAD. The third radiologist (more than five years of experience reading chest CT scans) identified 82 (75.9%) without CAD and 86 (79.6%) with CAD, according to White.
The difference in sensitivity was only statistically significant (p < 0.05) for the first and second readers, White said.
White acknowledged limitations of the study, including its reliance on one reader for each level of experience.
By Erik L. Ridley
AuntMinnie.com staff writer
November 27, 2006
http://www.auntminnie.com/index.asp?Sec=nws&Sub=rad&Pag=dis&ItemId=73694 Lung CT CAD boosts performance of less experienced radiologists
11/27/2006
By: Erik L. Ridley
肺部CT计算机辅助诊断可以提高低年资放射科大夫的诊断水平
CHICAGO - Computer-aided detection (CAD) systems can help radiologists with minimal and moderate experience in detecting lung nodules on chest CT scans, according to researchers from the University of Maryland, Baltimore.
"Chest CT CAD is valuable to assist radiologists of all experience levels to detect lung nodules," said Dr. Charles White. "The increase in sensitivity appears to benefit most of those radiologists with the least amount of experience.
芝加哥——根据Baltimore Maryland大学的研究人员称，计算机辅助诊断可以帮助低年资和中等年资放射科大夫诊断肺部CT扫描中的小结节。
White presented the team's findings Monday at the 2006 RSNA meeting.
怀特先生在2006年度RSNA大会上展示该小组的研究结果。
To evaluate the use of CAD as a second reader to detect lung nodules on chest CT scans, the researchers obtained 110 cases from four different sites. The study population included 64 women and 46 women with an average age of 58.6. There were 23 smokers, 63 nonsmokers, and 24 with unknown smoking status.
为了评价计算机辅助诊断双重阅片检测胸部CT扫描小结节的能力，研究人员从四个地方调出110例病例。包括64名女性，46名男性。平均年龄58.6岁，其中有23例吸烟者，63例不吸烟者，24名吸烟史不明。
Nine cases were produced from a four-slice CT scanner (GE Healthcare, Chalfont St. Giles, U.K.), 69 cases were contributed by a 16-slice CT scanner (Philips Medical Systems, Andover, MA), and 32 cases were generated by a 40-slice system (Philips). Slice thicknesses varied from 0.9 mm to 3 mm, and there was variation in both acquisition protocols and clinical indications for the exams, White said.
9例病例来自于4层螺旋CT（GE机型，位于英国），69力病例来自于16层螺旋CT（飞利浦机型，MA），32例来自于40层扫描机型（飞利浦）。层厚从0.9mm到3mm，采集序列于检查指证变化很大。
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作者:admin@医学,生命科学 2011-02-17 18:01
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