Automatic patient-instruction devices in thin-section CT of the thorax: Impact on image quality

Alexander A. Bankier, Dominik Fleischmann, Karl Dantendorfer, Michael N. Wiesmayr, Manfred Kontrus, Peter Hübsch, Christian J. Herold

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


PURPOSE: To determine what influence automatic patient-instruction (API) devices have on image quality of chest computed tomographic (CT) scans and whether the qualitative outcome justifies their routine use. MATERIALS AND METHODS: Thin-collimation CT scans of two age- and sex-matched groups of 64 patients each were evaluated prospectively for the presence of breathing artifacts and for concomitant deterioration of image quality. Breathing commands in group 1 were given with the API device and in group 2 with technologist-performed patient instruction. Cardiac motion artifacts were not evaluated. The frequency of scans repeated owing to breathing artifact was determined. RESULTS: Image quality was worse in group 1 compared with that of group 2. The percentage of scans repeated was higher with API (38%) than without API (16%). CONCLUSION: API devices cannot be recommended for thin- section CT of the thorax. The large number of scans that must be repeated leads to a considerable increase in patient irradiation, scanning time, and cost.

Original languageEnglish (US)
Pages (from-to)841-844
Number of pages4
Issue number3
StatePublished - Sep 1995


  • Computed tomography (CT), image quality
  • Computed tomography (CT), technology
  • Thorax, CT

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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