Investigation of thoracic four-dimensional CT-based dimension reduction technique for extracting the robust radiomic features.
Robust feature selection in radiomic analysis is often implemented using the RIDER test-retest datasets. However, the CT Protocol between the facility and test-retest datasets are different. Therefore, we investigated possibility to select robust features using thoracic four-dimensional CT (4D-CT) scans that are available from patients receiving radiation therapy. In 4D-CT datasets of 14 lung cancer patients who underwent stereotactic body radiotherapy (SBRT) and 14 test-retest datasets of non-small cell lung cancer (NSCLC), 1170 radiomic features (shape: n = 16, statistics: n = 32, texture: n = 1122) were extracted. A concordance correlation coefficient (CCC) > 0.85 was used to select robust features. We compared the robust features in various 4D-CT group with those in test-retest. The total number of robust features was a range between 846/1170 (72%) and 970/1170 (83%) in all 4D-CT groups with three breathing phases (40%-60%); however, that was a range between 44/1170 (4%) and 476/1170 (41%) in all 4D-CT groups with 10 breathing phases. In test-retest, the total number of robust features was 967/1170 (83%); thus, the number of robust features in 4D-CT was almost equal to that in test-retest by using 40-60% breathing phases. In 4D-CT, respiratory motion is a factor that greatly affects the robustness of features, thus by using only 40-60% breathing phases, excessive dimension reduction will be able to be prevented in any 4D-CT datasets, and select robust features suitable for CT protocol of your own facility.
['Tanaka|Shohei|S|', 'Kadoya|Noriyuki|N|', 'Kajikawa|Tomohiro|T|', 'Matsuda|Shohei|S|', 'Dobashi|Suguru|S|', 'Takeda|Ken|K|', 'Jingu|Keiichi|K|']
D000368:Aged D000369:Aged, 80 and over D002289:Carcinoma, Non-Small-Cell Lung D005260:Female D056973:Four-Dimensional Computed Tomography D006801:Humans D007091:Image Processing, Computer-Assisted D008175:Lung Neoplasms D008297:Male D008875:Middle Aged D013902:Radiography, Thoracic D047368:Tumor Burden
Radiomics 4D-CT Lung cancer Radiotherapy