1. Dmitriy Zinovev CSC 594 Final Presentation

2. Project Description Retrieve current information related to lung abnormalities from the free-text radiological reports. Within the anterior segment of the right upper lobe, there is a 1.2 x 1.7 cm peripheral lesion which comes close to the pleural surface. LocationSizeFinding

3. Issues Locating findings Distinguishing recent findings from past ones Resolving co-references Taking negation into account Determining whether a change has been noticed since last exam

4. Locating findings – …decrease in size of a small spiculated mass in the anterior… – …nodular opacity is seen… – …a rounded nodule in the right lower lobe… – …tiny 2 mm left upper lobe micronodule… – …is a bilobed focus, measuring 11 x 9 mm… Create a dictionary of terms Search “findings” portion of the report for the matches

5. Locating findings Extract location & size information associated with finding. – Search for location terms within the sentence using designated “location” dictionary. – Search for size within the sentence using pattern matching. [0-9]+,? [0-9]+ (X? [0-9]+,? [0-9]+)? _? (c|m)m – Use grammar parser to determine whether the extracted info refers to the finding

6. Distinguishing recent findings from past ones On 6/9/05, this right paratracheal mass measured 5.6 x 6.3 cm and currently measures 5.4 x 5.6 cm (series 2, image 18). Use grammar parses to check whether the verb associated with the subject has past tense

7. Resolving co-references In the left upper lobe, a triangular nodule is present on series 5 image 5. It also was present on the study from 10/17/02. It appears slightly more triangular in shape on the current study but has not changed significantly between exams.

8. Resolving co-references The majority of the mass is of low attenuation centrally, with a thin rim of tissue present around the periphery. It currently measures 42 x 37 mm, decreased from 49 mm on the previous study.

9. Resolving co-references If information of interest has not been found in the same sentence where finding was located, check if the subject of next matches with one of keywords. (This|It)

10. Taking negation into account No adrenal masses are identified. No new pulmonary parenchymal abnormalities are identified There are no pulmonary nodules or masses There are no focal areas of pulmonary consolidation

11. Determining whether a change has been noticed since last exam A 4 mm left lower lobe micronodule is again seen, which is unchanged in size and appearance Both were present on a remote CT dating back to 10/17/02 and are stable.

12. Summary

13. Cancer evidence (46 reports)ActualTotal Guessed 63366 101626 Total731992

14. Cancer evidence (Co-reference) (23 reports)ActualTotal Guessed 31839 7815 Total381654

15. Accuracy Percentage of correctly classified findings identified as current: – 80.82%

16. Future work Obtain more data Build more sophisticated co-reference resolution tool Generalize the rest of techniques