Comparison of radiation dose estimates, image noise, and scan duration in pediatric body imaging for volumetric and helical modes on 320-detector CT and helical mode on 64-detector CT.

Journal Article (Journal Article)

BACKGROUND: Advanced multidetector CT systems facilitate volumetric image acquisition, which offers theoretic dose savings over helical acquisition with shorter scan times. OBJECTIVE: Compare effective dose (ED), scan duration and image noise using 320- and 64-detector CT scanners in various acquisition modes for clinical chest, abdomen and pelvis protocols. MATERIALS AND METHODS: ED and scan durations were determined for 64-detector helical, 160-detector helical and volume modes under chest, abdomen and pelvis protocols on 320-detector CT with adaptive collimation and 64-detector helical mode on 64-detector CT without adaptive collimation in a phantom representing a 5-year-old child. Noise was measured as standard deviation of Hounsfield units. RESULTS: Compared to 64-detector helical CT, all acquisition modes on 320-detector CT resulted in lower ED and scan durations. Dose savings were greater for chest (27-46%) than abdomen/pelvis (18-28%) and chest/abdomen/pelvis imaging (8-14%). Noise was similar across scanning modes, although some protocols on 320-detector CT produced slightly higher noise. CONCLUSION: Dose savings can be achieved for chest, abdomen/pelvis and chest/abdomen/pelvis examinations on 320-detector CT compared to helical acquisition on 64-detector CT, with shorter scan durations. Although noise differences between some modes reached statistical significance, this is of doubtful diagnostic significance and will be studied further in a clinical setting.

Full Text

Duke Authors

Cited Authors

  • Johnston, JH; Podberesky, DJ; Yoshizumi, TT; Angel, E; Toncheva, G; Larson, DB; Egelhoff, JC; Anderson-Evans, C; Nguyen, GB; Barelli, A; Alsip, C; Salisbury, SR; Frush, DP

Published Date

  • September 2013

Published In

Volume / Issue

  • 43 / 9

Start / End Page

  • 1117 - 1127

PubMed ID

  • 23636537

Electronic International Standard Serial Number (EISSN)

  • 1432-1998

Digital Object Identifier (DOI)

  • 10.1007/s00247-013-2690-5


  • eng

Conference Location

  • Germany