Design considerations in cardiac CT

H. Bruder, K. Stierstorfer, C. McCollough, R. Raupach, M. Petersilka, M. Grasruck, C. Suess, B. Ohnesorge, T. Flohr

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

In cardiac CT temporal resolution is directly related to the gantry rotation time of 3rd generation CT scanners. This time cannot be substantially reduced below current standards of 0.33 s - 0.35 s due to mechanical limitations. As an alternative we present a dual source CT (DSCT) system. The system is equipped with two X-ray tubes and two corresponding detectors that are mounted onto the rotating gantry with an angular offset of 90°. Due to the simultaneous data acquisition and the angular offset, complementary quarter-scan data are measured at the same phase in the cardiac cycle. Hence, the exposure time of any image slice is reduced by a factor of two and the temporal resolution is improved by the same factor. In contrast to single source cardiac CT with multi-segment image reconstruction, the temporal resolution does not depend on the heart rate. Since multi-segment reconstruction techniques applied in single source cardiac CT, which limit the table speed, are no longer needed, faster volume coverage in cardiac spiral imaging can be achieved. As a consequence of these concepts, patient dose in cardiac CT can be significantly reduced. ECG correlated image reconstruction is based on 3D backprojection of the Feldkamp type. Data truncation coming from the fact that one detector (A) covers the entire scan field of view (50 cm in diameter), while the other detector (B) is restricted to a smaller, central field of view (26 cm in diameter), has to be treated. We evaluate temporal resolution and dose efficiency by means of phantom scans and computer simulations. We present first patient scans to illustrate the performance of DSCT for ECG correlated cardiac imaging.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2006
Subtitle of host publicationPhysics of Medical Imaging
DOIs
StatePublished - Jun 30 2006
EventMedical Imaging 2006: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 12 2006Feb 16 2006

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6142 I
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2006: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA
Period2/12/062/16/06

Keywords

  • Cardiac CT
  • Cardiac spiral imaging
  • Data truncation
  • Dual Source Computed Tomography (DSCT)
  • ECG correlated image reconstruction
  • Multi-slice Computed Tomography
  • Patient dose

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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    Bruder, H., Stierstorfer, K., McCollough, C., Raupach, R., Petersilka, M., Grasruck, M., Suess, C., Ohnesorge, B., & Flohr, T. (2006). Design considerations in cardiac CT. In Medical Imaging 2006: Physics of Medical Imaging [61420H] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 6142 I). https://doi.org/10.1117/12.651633