Consistency of FDG uptake on 18F-FDG PET/CT and regional homogeneity on functional MRI in major depression disorder patients

Abstract

Objective To investigate the changes of cerebral regional glucose metabolism and regional homogeneity (ReHo) and their relation in patients with major depression disorder (MDD) using 18F-FDG PET/CT and functional MRI (fMRI). Methods A total of 18 MDD patients (6 males, 12 females, age: (33.00±7.59) years) and 17 healthy controls (6 males, 11 females, age: (34.59±8.96) years) underwent 18F-FDG PET/CT and fMRI. The changes of glucose metabolism on PET and ReHo on fMRI were analyzed individually by SPM and ReHo fMRI 1.0 software. Pearson correlation analysis was used. Results Compared with the glucose metabolism of control subjects, those of MDD patients decreased in the bilateral superior, middle and inferior frontal gyri, bilateral superior and middle temporal gyri, bilateral anterior cingulate cortices, bilateral putamina and caudate nuclei and the left pallidum. Meanwhile the glucose metabolism increased in the bilateral hippocampi and the left thalamus. The ReHo in MDD patients decreased in bilateral superior and middle frontal gyri, left pallidum, bilateral putamina, left anterior cingulate cortex, whereas increased ReHo was found in right hippocampus and right thalamus. The SUV of bilateral superior, middle and inferior frontal gyri, bilateral superior and middle temporal gyri, bilateral putamina, left caudate, left pallidum, left anterior cingulate cortex, bilateral hippocampi and bilateral thalami were correlated with ReHo (r=0.51-0.83, all P 0.05). Conclusion There may be relative characteristic models of abnormal cerebral metabolism and cerebral dysfunction impairment in MDD patients, and the changes of cerebral regional glucose metabolism may be correlated with the changes of ReHo. Key words: Depressive disorder; Brain; Tomography, emission-computed; Tomography, X-ray computed; Magnetic resonance imaging; Deoxyglucose