Preliminary study of automatic gastric cancer risk classification from photofluorography

Figure 1 Target selection flowchart. H. pylori: Helicobacter pylori.

Figure 2 Examples of X-ray images correctly or incorrectly classified in the first stage. A: True class: Group B or C (D). Predicted class: H. pylori infection (Correct classification); B: True class: Group B or C (D). Predicted class: H. pylori infection (Correct classification); C: True class: Group B or C (D). Predicted class: H. pylori non-infection (Incorrect classification); D: True class: Group A. Predicted class: H. pylori non-infection (Correct classification); E: True class: Group A. Predicted class: H. pylori non-infection (Correct classification); F: True class: Group A. Predicted class: H. pylori infection (Incorrect classification). H. pylori: Helicobacter pylori.

Figure 3 Receiver operating characteristic curve of the first stage generated by changing the threshold.

Figure 4 Examples of X-ray images correctly or incorrectly classified in the second stage. A: True class: Group C (D). Predicted class: Severe (Correct classification); B: True class: Group C (D). Predicted class: Severe (Correct classification); C: True class: Group C (D). Predicted class: Non-severe (Incorrect classification); D: True class: Group B. Predicted class: Non-severe (Correct classification); E: True class: Group B. Predicted class: Non-severe (Correct classification); F: True class: Group B. Predicted class: Severe (Incorrect classification).

Figure 5 Receiver operating characteristic curve of the second stage generated by changing the threshold.