Abstract Archives of the RSNA, 2007
SSJ16-04
Evaluation of Radiologists' Performance in Detection of Clustered Microcalcifications on Digital Mammograms by Use of Super-High Resolution Liquid Crystal Display Monitors
Scientific Papers
Presented on November 27, 2007
Presented as part of SSJ16: Physics (Visualization, Displays, PACS)
Junji Shiraishi, Presenter: License agreement, Riverain Medical
License agreement, MEDIAN Technologies
Research support, Riverain Medical
Research support, Totoku Electric Co, Ltd
Consultant, Riverain Medical
Hiroyuki Abe MD, Abstract Co-Author: Research grant, Totoku Electric Co, Ltd
Katsuhiro Ichikawa PhD, Abstract Co-Author: License agreement, Totoku Electric Co, Ltd
Research support, Totoku Electric Co, Ltd
Mikio Hasegawa, Abstract Co-Author: Nothing to Disclose
Kunio Doi PhD, Abstract Co-Author: Shareholder, Hologic, Inc (R2 Technology, Inc)
License Agreement, Hologic, Inc (R2 Technology, Inc)
License Agreement, Deus Technologies, LLC
License Agreement, Riverain Medical
License Agreement, Mitsubishi Corporation
License Agreement, MEDIAN Technologies
License Agreement, General Electric Company
License Agreement, Toshiba Corporation
Research Support, Deus Technologies, LLC
Research Support, DuPont
Research Support, Elbit Medical Imaging Ltd
Research Support, Fuji Photo Film Co, Ltd
Research Support, General Electric Company
Research Support, Hitachi, Ltd
Research Support, Eastman Kodak Company
Research Support, Konica Minolta Group
Research Support, Mitaya Manufacturing Co, Ltd
Research Support, Mitsubishi Corporation
Research Support, Koninklijke Philips Electronics NV
Research Support, Hologic, Inc (R2 Technology, Inc)
Research Support, Riverain Medical
Research Support, Seiko Corporation
Research Support, Siemens AG
Research Support, 3M Company
Research Support, Toshiba Corporation
We evaluated the usefulness of a super-high resolution (SHR) liquid crystal display (LCD) in terms of an improvement in radiologist's diagnostic accuracy in detecting clustered microcalcifications (MCLs) on digital mammograms, by use of a multi-reader multi-case receiver operating characteristic (MRMC-ROC) analysis.
Thirty digital mammograms with and 30 without clustered MCLs were selected for an observer study. Original pixel size (0.10mm) of digital mammograms was converted to the pixel size of 0.05mm by use of an interpolation method. The conventional monochrome 21 inch LCD with 3 mega-pixels and its SHR enhancement with 9 mega-pixels which was derived by an independent sub-pixel driving technique were compared. Seven radiologists participated in two reading sessions with an interval of at least one week. Reading orders of two resolutions and 60 cases were randomly selected for each observer. In both reading sessions with 3 and 9 mega-pixel resolutions, the observers were blinded in the resolution of LCDs. The MRMC-ROC analysis was used to assess the statistical significance of differences in radiologists' performance between two different resolutions of LCDs.
Preliminary results indicated that the average area under the ROC curve (AUC) for detecting clustered MCLs was slightly improved from 0.93 to 0.94 by use of the SHR-LCD with 9 mega-pixels, but there was no statistically significant difference (p=0.095). In addition, there was a slight improvement by use of SHR-LCD in terms of the number of cases correctly identified as cases with clustered MCLs (88.1% to 90.0%) and the number of false positive responses (0.31 to 0.30 per image).
The SHR-LCD has a potential to increase the sensitivity for the detection of clustered MCLs, however, the difference between the conventional LCD with 3 mega-pixels and the SHR-LCD with 9 mega-pixels was very small in terms of the improvement of diagnostic accuracy for the detection of clustered MCLs.
The clinical utility of the SHR-LCD would be demonstrated when the high-resolution digital radiography become more common, and the radiologists would become familiar with those resolutions.
Shiraishi, J,
Abe, H,
Ichikawa, K,
Hasegawa, M,
Doi, K,
Evaluation of Radiologists' Performance in Detection of Clustered Microcalcifications on Digital Mammograms by Use of Super-High Resolution Liquid Crystal Display Monitors. Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL.
http://archive.rsna.org/2007/5001377.html