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Investigation of reading mode and relative sensitivity as factors that influence reader performance when using
Sophie Paquerault1, Frank W Samuelson, Nicholas Petrick
1Center for Devices and Radiological Health/National Insitute of Biomedical Imaging and Bioengineering, Joint Laboratory for Assessment of Medical Imaging Systems, US Food and Drug Administration, Silver Spring, MD 20993-0002, USA. sophie.paquerault@fda.hhs.gov
Relative sensitivity significantly impacts reader performance with computer-aided detection (CAD) software, especially for low-contrast images. The study found relative sensitivity is more crucial than reading mode for improving detection accuracy.
Area of Science:
- Radiology
- Medical Imaging Analysis
Background:
- Computer-aided detection (CAD) software is increasingly used in medical imaging to assist readers.
- The effectiveness of CAD can be influenced by factors such as image contrast and how the software is integrated into the reading workflow.
Purpose of the Study:
- To evaluate how relative sensitivity (reader performance without CAD vs. with CAD) and reading mode (second read vs. concurrent read) affect reader performance.
- To determine the relative importance of relative sensitivity and reading mode in optimizing CAD performance.
Main Methods:
- Two sets of mammography images (low-contrast and high-contrast) were created with simulated masses.
- Seven readers evaluated images in three modes: without CAD, second read with CAD, and concurrent read with CAD.
- Reader performance was assessed using areas under the free-response receiver operating characteristic curves, sensitivity, and false-positive findings.
Main Results:
- Reader performance improvements were more pronounced in the low-contrast image set compared to the high-contrast set.
- Relative sensitivity was found to be a significant factor influencing performance, particularly for low-contrast masses.
- No significant difference in performance was observed between the second read and concurrent read modes.
Conclusions:
- Relative sensitivity is a critical determinant of the incremental benefits gained from using CAD software.
- The clinical utility of CAD may depend on its relative sensitivity in specific applications and for different user groups.
- Focusing on improving relative sensitivity could enhance the overall effectiveness of CAD systems.
