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Informatics in Radiology (infoRAD)

Introduction to the Language of Three-dimensional Imaging with Multidetector CT¹

¹ From the Department of Radiology, University of Texas Health Science Center, 7703 Floyd Curl Dr, San Antonio, TX 78229-3900. Recipient of a Certificate of Merit award for an education exhibit at the 2004 RSNA Annual Meeting. Received March 7, 2005; revision requested May 23 and received June 22; accepted June 30. All authors have no financial relationships to disclose. Address correspondence to N.C.D. (e-mail: dalrymplen{at}uthscsa.edu).

The recent proliferation of multi–detector row computed tomography (CT) has led to an increase in the creation and interpretation of images in planes other than the traditional axial plane. Powerful three-dimensional (3D) applications improve the utility of detailed CT data but also create confusion among radiologists, technologists, and referring clinicians when trying to describe a particular method or type of image. Designing examination protocols that optimize data quality and radiation dose to the patient requires familiarity with the concepts of beam collimation and section collimation as they apply to multi–detector row CT. A basic understanding of the time-limited nature of projection data and the need for thin-section axial reconstruction for 3D applications is necessary to use the available data effectively in clinical practice. The axial reconstruction data can be used to create nonaxial two-dimensional images by means of multiplanar reformation. Multiplanar images can be thickened into slabs with projectional techniques such as average, maximum, and minimum intensity projection; ray sum; and volume rendering. By assigning a full spectrum of opacity values and applying color to the tissue classification system, volume rendering provides a robust and versatile data set for advanced imaging applications.

© RSNA, 2005

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