CT evaluation of normal interatrial fat thickness

J Comput Assist Tomogr. Nov-Dec 1996;20(6):950-3. doi: 10.1097/00004728-199611000-00015.


Purpose: This study was performed to determine the normal thickness of fat in the interatrial septum as demonstrated by CT.

Method: Eighty-seven subjects underwent helical chest CT examination as part of a separate protocol to compare the quantification of coronary artery calcification by CT to coronary angiographic findings, using a slice width of 3 mm, reconstructed every 1.5 mm. The thickness of the interatrial fat in both groups was measured anterior and posterior to the fossa ovalis. The mean and standard deviation were calculated.

Results: The mean thickness of interatrial fat anterior and posterior to the fossa ovalis was 4.6 (SD = 2.5) and 3.7 (SD = 3.1) mm, respectively.

Conclusion: The normal range of thickness of the interatrial fat is 0-9.6 mm anterior to and 0-9.9 mm posterior to the fossa (2 SD above the mean).

MeSH terms

  • Adipose Tissue / diagnostic imaging*
  • Adult
  • Aged
  • Aged, 80 and over
  • Aging
  • Coronary Angiography
  • Female
  • Heart Septum / diagnostic imaging*
  • Humans
  • Linear Models
  • Male
  • Middle Aged
  • Reference Values
  • Tomography, X-Ray Computed* / instrumentation
  • Tomography, X-Ray Computed* / methods
  • Tomography, X-Ray Computed* / statistics & numerical data