Respiratory motion of adrenal gland metastases: Analyses using four-dimensional computed tomography images.

Purpose: To evaluate the respiratory motion of adrenal gland metastases in three-dimensional directions using four-dimensional computed tomography (4DCT) images.

Methods: From January 2013 to May 2016, 12 patients with adrenal gland metastases were included in this study. They all underwent 4DCT scans to assess respiratory motion of adrenal gland metastases in free breathing state.