Time to Diagnosis and Performance Levels during Repeat Interpretations of Digital Breast Tomosynthesis: Preliminary Observations
Received 18 September 2009; accepted 8 November 2009. published online 28 December 2009.
Rationale and Objectives
To compare time to interpretation and diagnostic performance levels during repeat readings of full-field digital mammography (FFDM) and digital breast tomosynthesis (DBT) in a retrospective study.
Materials and Methods
Three experienced radiologists twice interpreted 125 selected examinations, 35 with verified cancers and 90 negative for cancer during a period of 22 months using FFDM alone followed by a combined FFDM + DBT mode. Changes in time to “review and rate” these examinations as well as in diagnostic performance levels where assessed. A fixed-effect analysis accounting for cross-correlation due to the review of the same examinations by the same readers was performed.
Results
The total (combined) time to review and rate an examination increased on average by 33% between the first and second readings of the same examinations (P < .001). Radiologists reduced their time to review FFDM before making the DBT available for viewing. However, they spent more time reviewing the combined FFDM + DBT mode. The recall rates for examinations depicting cancer remained largely unchanged. Among the groups of examinations with concordant and discordant recall recommendations during the two readings only the group examinations that were “newly recalled” during repeat reading, took significantly longer (P < .01).
Conclusion
DBT-based breast imaging may ultimately result in a substantial increase in performance; however, without efficiency improvements DBT may take longer to interpret. Addition of “false-positive recalls” was most strongly associated with increase in interpretation time while elimination of “false-positive recalls” did not require longer interpretation time.
ABSTRACT