用于数字化乳腺摄影的液晶显示器与阴极射线管显示器：检测簇状微钙化和肿块时观察者性能的比较

LCD versus CRT monitors for digital mammography: a comparison of observer performance for the detection of clustered microcalcifications and masses.

作者信息

Cha Joo Hee, Moon Woo Kyung, Cho Nariya, Lee Eun Hye, Park Jeong Seon, Jang Mi Jung

机构信息

Department of Radiology, Boramae Municipal Hospital, Seoul, Korea.

出版信息

Acta Radiol. 2009 Dec;50(10):1104-8. doi: 10.3109/02841850903246608.

DOI:10.3109/02841850903246608

PMID:19922305

Abstract

BACKGROUND

There are two types of soft-copy display of digital mammograms, cathode-ray tube (CRT) and liquid-crystal display (LCD) monitors, and these present different resolutions and noise characteristics.

PURPOSE

To compare observer performances for the detection of clustered microcalcifications and masses in digital mammograms, using LCD and CRT monitors.

MATERIAL AND METHODS

Four radiologists evaluated 100 digital mammograms. Of these, 28 mammograms depicted clustered microcalcifications (12 benign, 16 malignant), 18 depicted masses (10 benign, eight malignant), and 54 depicted no apparent abnormality. The images were stored uncompressed as Digital Imaging and Communications in Medicine (DICOM) files and randomized for two sessions of soft-copy reading. The readers independently read all cases displayed on two 5-megapixel LCD and two CRT monitors with an interval of 3 months. Observers were asked to rate using a five-point scale the likelihoods of microcalcifications and masses independently. Receiver operating characteristic analysis was used to analyze results.

RESULTS

For the LCD and CRT monitors, average area-under-the-curve (A(z)) values for microcalcification detection were 0.977 (0.976, 0.970, 0.980, and 0.983 for the four readers) and 0.958 (0.910, 0.990, 0.976, 0.956), respectively. Corresponding A(z) values for masses were 0.971 (0.955, 0.990, 0.949, 0.989) and 0.944 (0.928, 0.966, 0.955, 0.925). No statistically significant difference was detected between the two monitor types (P>0.05).

CONCLUSION

The LCD and CRT monitors are comparable in terms of detecting clustered microcalcifications and masses in digital mammograms.

摘要

背景

数字乳腺摄影的软拷贝显示有两种类型，即阴极射线管（CRT）显示器和液晶显示器（LCD），它们具有不同的分辨率和噪声特性。

目的

比较使用LCD和CRT显示器时，观察者对数字乳腺摄影中簇状微钙化和肿块的检测性能。

材料与方法

四位放射科医生评估了100幅数字乳腺摄影图像。其中，28幅乳腺摄影图像显示有簇状微钙化（12例良性，16例恶性），18幅显示有肿块（10例良性，8例恶性），54幅未显示明显异常。图像以未压缩的医学数字成像和通信（DICOM）文件形式存储，并随机分为两个软拷贝阅读时段。读者独立阅读在两台500万像素的LCD和两台CRT显示器上显示的所有病例，间隔3个月。要求观察者使用五点量表独立评估微钙化和肿块的可能性。采用受试者操作特征分析来分析结果。

结果

对于LCD和CRT显示器，微钙化检测的平均曲线下面积（A(z)）值分别为0.977（四位读者分别为0.976、0.970、0.980和0.983）和0.958（0.910、0.990、0.976、0.956）。肿块的相应A(z)值分别为0.971（0.955、0.990、0.949、0.989）和0.944（0.928、0.966、0.955、0.925）。两种显示器类型之间未检测到统计学显著差异（P>0.05）。