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Research Article:
Mouse cursor movement and eye tracking data as an indicator of pathologists' attention when viewing digital whole slide images
Vignesh Raghunath, Melissa O Braxton, Stephanie A Gagnon, Tad T Brunyé, Kimberly H Allison, Lisa M Reisch, Donald L Weaver, Joann G Elmore, Linda G Shapiro
J Pathol Inform
2012, 3:43 (20 December 2012)
DOI
:10.4103/2153-3539.104905
PMID
:23372984
Context:
Digital pathology has the potential to dramatically alter the way pathologists work, yet little is known about pathologists' viewing behavior while interpreting digital whole slide images. While tracking pathologist eye movements when viewing digital slides may be the most direct method of capturing pathologists' viewing strategies, this technique is cumbersome and technically challenging to use in remote settings. Tracking pathologist mouse cursor movements may serve as a practical method of studying digital slide interpretation, and mouse cursor data may illuminate pathologists' viewing strategies and time expenditures in their interpretive workflow.
Aims:
To evaluate the utility of mouse cursor movement data, in addition to eye-tracking data, in studying pathologists' attention and viewing behavior.
Settings and Design:
Pathologists (
N
= 7) viewed 10 digital whole slide images of breast tissue that were selected using a random stratified sampling technique to include a range of breast pathology diagnoses (benign/atypia, carcinoma
in situ
, and invasive breast cancer). A panel of three expert breast pathologists established a consensus diagnosis for each case using a modified Delphi approach.
Materials and Methods:
Participants' foveal vision was tracked using SensoMotoric Instruments RED 60 Hz eye-tracking system. Mouse cursor movement was tracked using a custom MATLAB script.
Statistical Analysis Used:
Data on eye-gaze and mouse cursor position were gathered at fixed intervals and analyzed using distance comparisons and regression analyses by slide diagnosis and pathologist expertise. Pathologists' accuracy (defined as percent agreement with the expert consensus diagnoses) and efficiency (accuracy and speed) were also analyzed.
Results:
Mean viewing time per slide was 75.2 seconds (SD = 38.42). Accuracy (percent agreement with expert consensus) by diagnosis type was: 83% (benign/atypia); 48% (carcinoma
in situ
); and 93% (invasive). Spatial coupling was close between eye-gaze and mouse cursor positions (highest frequency ∆x was 4.00px (SD = 16.10), and ∆y was 37.50px (SD = 28.08)). Mouse cursor position moderately predicted eye gaze patterns (
R
x = 0.33 and
R
y = 0.21).
Conclusions:
Data detailing mouse cursor movements may be a useful addition to future studies of pathologists' accuracy and efficiency when using digital pathology.
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© Journal of Pathology Informatics | Published by Wolters Kluwer -
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Online since 10
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March, 2010