Prediction of tumor regression grading in rectal cancer neoadjuvant chemoradiotherapy: a habitat radiomics analysis of imaging biomarker.

Tumor habitat clustering, feature extraction, and selection Optimal number of clusters Clustering performance was evaluated for 2–10 clusters using the Calinski–Harabasz index, which showed an initial increasing trend followed by a decreasing trend, with the peak value observed at 3 clusters.

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