Pulmonary atelectasis: Signal patterns with MR imaging

Christian J. Herold, Janet E. Kuhlman, Elias Zerhouni

Research output: Contribution to journalArticle

Abstract

To assess the signal characteristics of different types of pulmonary atelectasis on magnetic resonance (MR) images, the authors studied obstructive atelectasis (OA) in 17 patients and nonobstructive atelectasis (NOA) in 25 patients. All patients underwent electrocardiographically gated MR imaging studies of the thorax with standard spin-echo sequences. No signal differences were observed between either type of atelectasis on T1-weighted images. Conversely, OA and NOA appeared significantly different on spin-density-weighted images (P <.001) and on T2-weighted studies (P <.0001). On T2-weighted images, all 17 cases of OA appeared hyperintense, whereas 22 of 25 cases of NOA demonstrated a very low signal intensity. Differences in the pathophysiology of OA and NOA presumably account for this observation. In OA, alveolar air is totally resorbed and secretions accumulate in the obstructed lung. The resulting increase in free fluid prolongs the T2 relaxation times and leads to high signal intensity on T2-weighted images. In NOA, the short T2 relaxation time of lung tissue in the absence of secretions and potential magnetic susceptibility effects due to residual air are likely to be responsible for the low T2 signal pattern.

Original languageEnglish (US)
Pages (from-to)715-720
Number of pages6
JournalRadiology
Volume178
Issue number3
StatePublished - Mar 1991

Fingerprint

Pulmonary Atelectasis
Magnetic Resonance Imaging
Air
Lung
Magnetic Resonance Spectroscopy
Thorax

Keywords

  • Lung, collapse, 60.74
  • Lung, MR studies, 60.1214

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology

Cite this

Herold, C. J., Kuhlman, J. E., & Zerhouni, E. (1991). Pulmonary atelectasis: Signal patterns with MR imaging. Radiology, 178(3), 715-720.

Pulmonary atelectasis : Signal patterns with MR imaging. / Herold, Christian J.; Kuhlman, Janet E.; Zerhouni, Elias.

In: Radiology, Vol. 178, No. 3, 03.1991, p. 715-720.

Research output: Contribution to journalArticle

Herold, CJ, Kuhlman, JE & Zerhouni, E 1991, 'Pulmonary atelectasis: Signal patterns with MR imaging', Radiology, vol. 178, no. 3, pp. 715-720.
Herold CJ, Kuhlman JE, Zerhouni E. Pulmonary atelectasis: Signal patterns with MR imaging. Radiology. 1991 Mar;178(3):715-720.
Herold, Christian J. ; Kuhlman, Janet E. ; Zerhouni, Elias. / Pulmonary atelectasis : Signal patterns with MR imaging. In: Radiology. 1991 ; Vol. 178, No. 3. pp. 715-720.
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