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


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


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).


CONCLUSIONS
The LCD and CRT monitors are comparable in terms of detecting clustered microcalcifications and masses in digital mammograms.
Cha
Joo Hee
JH
Department of Radiology, Boramae Municipal Hospital, Seoul, Korea.
Moon
Woo Kyung
WK
Cho
Nariya
N
Lee
Eun Hye
EH
Park
Jeong Seon
JS
Jang
Mi Jung
MJ
D001941:Breast Diseases / Q000000981:diagnostic imaging*; D002114:Calcinosis / Q000000981:diagnostic imaging; D055984:Cathode Ray Tube; D016288:Computer Terminals; D005260:Female; D006801:Humans; D050866:Liquid Crystals; D008327:Mammography / Q000295:instrumentation*; D015588:Observer Variation; D012372:ROC Curve; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation*; D012189:Retrospective Studies; D014584:User-Computer Interface