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Related Experiment Videos

Hyperlucent thorax from rotation. Anatomic basis

J R Crass1, A M Cohen, E Wiesen

  • 1Department of Radiology, MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio 44109-1998.

Investigative Radiology
|July 1, 1993
PubMed
Summary
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Patient rotation during computed tomography (CT) scans can cause unilateral hyperlucency. However, these changes are minimal and clinically insignificant, overshadowed by soft tissue compression.

Area of Science:

  • Medical Imaging
  • Radiology
  • Computed Tomography

Background:

  • Unilateral hyperlucency on chest computed tomography (CT) can be artifactual.
  • Patient positioning, specifically rotation, is a potential cause of such findings.

Purpose of the Study:

  • To evaluate the presence and significance of unilateral hyperlucency caused by patient rotation during CT.
  • To determine the anatomic basis of this phenomenon.

Main Methods:

  • Analysis of chest CT sections from 65 patients using a microcomputer.
  • Calculation of radiographic transmittance data at various degrees of patient rotation and lateral decentering.
  • Stratified subgroup analysis of density variations.

Main Results:

Related Experiment Videos

  • A trend of increased radiographic transmission was observed on the side opposite anterior obliquity.
  • The resulting optical density differences were small and not clinically significant.
  • Anterior breast/pectoral soft tissues were identified as the primary cause of the phenomenon.

Conclusions:

  • Rotation-induced changes in radiographic transmission are minor and masked by soft tissue compression.
  • Rotation can lead to decreased radiographic transmission on the side of anterior obliquity, making the contralateral side appear more lucent.