Hypoperfusion in the limbic system and prefrontal cortex in depression: SPECT with anatomic standardization technique

Hiroshi Ito, Ryuta Kawashima, Shuichi Awata, Shuichi Ono, Kazunori Sato, Ryoui Goto, Masamichi Koyama, Mitsumoto Sato, Hiroshi Fukuda

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)

Abstract

Depression is a common psychiatric illness, and several reports have described cerebral blood flow (CBF) abnormalities on SPECT studies in affected patients. However, because region of interest analyses were used to determine significant CBF changes in these studies, there were methodological limitations. Therefore, we investigated CBF distribution abnormalities in depression on a pixel-by-pixel basis using SPECT and an anatomic standardization technique that has been commonly used for PET activation studies. Methods: Eleven patients with unipolar depression, six patients with bipolar depression and nine age-matched normal control subjects underwent HMPAO brain SPECT studies. The radioactivities of SPECT images for each subject were globally normalized to 100 counts/pixel. Then, each SPECT image was transformed for standard brain anatomy using a computerized Human Brain Atlas system. For each group, the mean and variance images were calculated from the standardized anatomic SPECT images, and group comparisons were performed on a pixel-by-pixel basis. Results: Significant decreases in CBF in the prefrontal cortices, limbic systems and paralimbic areas were observed in bath depression groups compared with the normal control group. Conclusion: Decreases in CBF in these regions may be related to impaired attention as well as cognitive and emotional responses, which have been recognized as usual symptoms in depression. The anatomic standardization technique promises to be useful for group comparison analysis of brain SPECT on a pixel-by- pixel basis for individual neurological and psychiatric diseases.

Original languageEnglish
Pages (from-to)410-414
Number of pages5
JournalJournal of Nuclear Medicine
Volume37
Issue number3
Publication statusPublished - 1996 Mar 1

Keywords

  • SPECT
  • anatomic standardization
  • depression
  • limbic system
  • prefrontal cortex

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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