Effect of topogram-tube angle combination on CT radiation dose reduction

J. Shim, M. Yoon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This study assessed the ability of various types of topograms, when used with an automatic tube current modulation (ATCM) technique, to reduce radiation dose from computed tomography (CT) scans. Three types of topograms were used with the ATCM technique: (i) anteroposterior (AP) topograms alone, (ii) AP topograms followed by lateral topograms, and (iii) lateral topograms followed by AP topograms. Various regions (chest, abdomen and whole-body) of a humanoid phantom were scanned at several tube voltages (80, 100 and 120 kVp) with the selected topograms. Although the CT dose depended on the order of topograms, the CT dose with respect to patient positioning depended on the number of topograms performed. The magnitude of the difference in CT dose between number and order of topograms was greater for the scans of the abdomen than the chest. These results suggest that, for the Siemens SOMATOM Definition AS CT scanner, choosing the right combination of CT scan conditions with the ATCM technique can minimize radiation dose to a patient.

Original languageEnglish
Article numberT09003
JournalJournal of Instrumentation
Issue number9
Publication statusPublished - 2017 Sept 22

Bibliographical note

Funding Information:
This work was supported by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KOFONS), granted financial resource from the Nuclear Safety and the National Nuclear R&D Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (NRF-2015M2A2A7A02045273).

Publisher Copyright:
© 2017 IOP Publishing Ltd and Sissa Medialab.


  • Computerized Tomography (CT) and Computed Radiography (CR)
  • Radiation calculations

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation


Dive into the research topics of 'Effect of topogram-tube angle combination on CT radiation dose reduction'. Together they form a unique fingerprint.

Cite this