Visualization of CAD results to the radiologist: Influence of the marker type on radiologist's sensitivity for the detection of pulmonary nodules

Florian Beyer; Stefan Diederich; Walter Heindel; Dag Wormanns

doi:10.1117/12.708897

31 March 2007 Visualization of CAD results to the radiologist: Influence of the marker type on radiologist's sensitivity for the detection of pulmonary nodules

Florian Beyer, Stefan Diederich, Walter Heindel, Dag Wormanns

Author Affiliations +

Proceedings Volume 6514, Medical Imaging 2007: Computer-Aided Diagnosis; 651426 (2007) https://doi.org/10.1117/12.708897
Event: Medical Imaging, 2007, San Diego, CA, United States

Abstract

Purpose: The efficiency of the detection of pulmonary nodules by a radiologist with the help of CAD is influenced by the user interface of the system. Marker with a visually dominant appearance may distract the radiologist from other parts of the screen. Purpose was to analyse the influence of different CAD markers on radiologist's performance. Materials and methods: 10 radiologists analysed 150 pictures of chest CT slices. Every picture contained a CAD marker; five different types of markers were used - each respectively on 30 pictures (1: thick walled square, 2: thin walled circle, 3: small arrow, 4: pixel sized point on nodule, 5: very subtle change of colour). One hundred images contained one nodule: CAD markers marked this finding in 50 cases; in 50 cases a false positive finding was marked instead. The remaining 50 images contained no nodule but a marker of a false positive finding. The radiologists had to decide for each image if there was a nodule visible and either click on the nodule or on a button "no finding". Sensitivity and specificity were calculated for each marker type. Results: Mean sensitivity was 59%, 62%, 64%, 65% and 64% for marker 1 to 5, respectively. Specificity was 50%, 51%, 64%, 45% and 67%. In the cases with false positive findings sensitivity for detection of the unmarked nodule was 41%, 58%, 59%, 49% and 54%. New work to be presented: The study shows that the marker type influences radiologist's sensitivity and distraction from other findings. Conclusion: Of the tested markers a small arrow was most efficient for the presentation of the results to the radiologist.

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Florian Beyer, Stefan Diederich, Walter Heindel, and Dag Wormanns "Visualization of CAD results to the radiologist: Influence of the marker type on radiologist's sensitivity for the detection of pulmonary nodules", Proc. SPIE 6514, Medical Imaging 2007: Computer-Aided Diagnosis, 651426 (31 March 2007); https://doi.org/10.1117/12.708897

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KEYWORDS

Computer aided diagnosis and therapy

Visualization

Computed tomography

Chest

Lung

Diagnostics

CAD systems

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