Outline Introduction Anotation Segmentation Detection.

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Presentation transcript:

Outline Introduction Anotation Segmentation Detection

2 Nodule interpretation (characteristics) CharacteristicPossible Scores Calcification1. Popcorn 2. Laminated 3. Solid 4. Non-central 5. Central 6. Absent Internal structure1. Soft Tissue 2. Fluid 3. Fat 4. Air Lobulation1. Marked None Malignancy1. Highly Unlikely 2. Moderately Unlikely 3. Indeterminate 4. Moderately Suspicious 5. Highly Suspicious CharacteristicPossible Scores Margin1. Poorly Defined Sharp Sphericity1. Linear Ovoid Round Spiculation1. Marked None Subtlety1. Extremely Subtle 2. Moderately Subtle 3. Fairly Subtle 4. Moderately Obvious 5. Obvious Texture1. Non-Solid Part Solid/(Mixed) Solid 7 out of 9 semantic characteristics have a broad range of values for the 149 nodules

Interpretation Not only ratings, but also boundaries are different Reader 1Reader 2 Reader 3Reader 4 Lobulation - 4 Malignancy - 5 Margin - 4 Sphericity - 2 Spiculation - 1 Subtlety - 5 Texture - 4 Lobulation - 1 Malignancy - 5 Margin - 3 Sphericity - 4 Spiculation - 2 Subtlety - 5 Texture - 5 Lobulation - 2 Malignancy - 5 Margin - 3 Sphericity - 5 Spiculation - 2 Subtlety - 5 Texture - 4 Lobulation - 5 Malignancy - 5 Margin - 2 Sphericity - 3 Spiculation - 4 Subtlety - 5 Texture - 4

Proposed methodology The automatic mapping extraction is: SEMI- SUPERVISED  Only small amount of data is initially labeled. Based on ACTIVE LEARNING  Iteratively adds data to the training set.

5 Methodology: Ensemble of classifiers (Active-Decorate)

6 Results (Accuracy) Characte ristics Decision trees Add instances predicted with high confidence (60%) Add instances predicted with high confidence (60%) and instances with low margin (5%) Lobulation27.44%81.00%69.66% Malignanc y 42.22%96.31% Margin35.36%98.68%96.83% Sphericity36.15%91.03%90.24% Spiculation36.15%63.06%58.84% Subtlety38.79%93.14%92.88% Texture53.56%97.10%97.36% Average38.52%88.62%86.02%

Radiology report

IRMA - T (technical): image modality - D (directional): body orientation - A (anatomical): body region examined - B (biological): biological system examined This allows a short and unambiguous notation (IRMA: TTTT – DDD – AAA – BBB),

IRMA

Questions?