It is very important to recognize parathyroid nodules correctly in ultrasound images for the treatment of hyperparathyroidism. Due to individual differences of patients and complexity of ultrasound images

parathyroid nodules can’t be recognized accurately by only using morphological features and texture features. In this paper

a prior knowledge feature description method is proposed on account of the characteristic of envelope and the relative location between the nodule and the thyroid. SVDD is applied to recognize parathyroid nodules based on the fusion features of prior knowledge features

morphological features and texture features. The experimental results show that the prior knowledge features can describe the characteristics of parathyroid nodules well

and the accuracy by using the fusion features which combined prior knowledge features is higher than that of only using morphological features and texture features for the recognition of parathyroid nodules.