, Volume 61, Issue 8, pp 953–956 | Cite as

Improving resolution of head and neck CTA using the small x-ray tube focal spot

  • Johannes RosskopfEmail author
  • Michael Braun
  • Meinrad Beer
  • Bernd L. Schmitz
Short Report


CT-resolution depends on tube focal spot size. To investigate the effect of reducing focal spot on vessel wall clarity, 22 patients underwent head and neck CTA acquisition with large and small focal spot size. Hounsfield density profile was assessed for each head and neck vessel separately, and significantly sharper density increase at vessel borders was observed using smaller tube focus by an average of 9.9% to 82° angle degrees (p < .05). In conclusion, spatial resolution of CTA of head and neck vessels can be improved by using the small x-ray tube focal spot.


Computed tomography angiography Radiographic image enhancement Cerebral angiography Arteries Neck 



Computed tomography


Computed tomography angiography.



The authors would like to acknowledge the radiographers (Department of Neuroradiology, University of Ulm, Günzburg, Germany) for the MRI data acquisitions.


No funding was received for this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of RadiologyUniversity of UlmUlmGermany
  2. 2.Department of NeuroradiologyUniversity of UlmGünzburgGermany

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