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European Radiology

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01-11-2017 | Physics

Do we need 3D tube current modulation information for accurate organ dosimetry in chest CT? Protocols dose comparisons

Authors: Xochitl Lopez-Rendon, Guozhi Zhang, Walter Coudyzer, Wim Develter, Hilde Bosmans, Federica Zanca

Published in: European Radiology | Issue 11/2017

Abstract

Objectives

To compare the lung and breast dose associated with three chest protocols: standard, organ-based tube current modulation (OBTCM) and fast-speed scanning; and to estimate the error associated with organ dose when modelling the longitudinal (z-) TCM versus the 3D-TCM in Monte Carlo simulations (MC) for these three protocols.

Method

Five adult and three paediatric cadavers with different BMI were scanned. The CTDI_vol of the OBTCM and the fast-speed protocols were matched to the patient-specific CTDI_vol of the standard protocol. Lung and breast doses were estimated using MC with both z- and 3D-TCM simulated and compared between protocols.

Results

The fast-speed scanning protocol delivered the highest doses. A slight reduction for breast dose (up to 5.1%) was observed for two of the three female cadavers with the OBTCM in comparison to the standard. For both adult and paediatric, the implementation of the z-TCM data only for organ dose estimation resulted in 10.0% accuracy for the standard and fast-speed protocols, while relative dose differences were up to 15.3% for the OBTCM protocol.

Conclusion

At identical CTDI_vol values, the standard protocol delivered the lowest overall doses. Only for the OBTCM protocol is the 3D-TCM needed if an accurate (<10.0%) organ dosimetry is desired.

Key points

• The z-TCM information is sufficient for accurate dosimetry for standard protocols.

• The z-TCM information is sufficient for accurate dosimetry for fast-speed scanning protocols.

• For organ-based TCM schemes, the 3D-TCM information is necessary for accurate dosimetry.

• At identical CTDI _vol , the fast-speed scanning protocol delivered the highest doses.

• Lung dose was higher in XCare than standard protocol at identical CTDI _vol .

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Title: Do we need 3D tube current modulation information for accurate organ dosimetry in chest CT? Protocols dose comparisons
Authors: Xochitl Lopez-Rendon
Guozhi Zhang
Walter Coudyzer
Wim Develter
Hilde Bosmans
Federica Zanca
Publication date: 01-11-2017
Publisher: Springer Berlin Heidelberg
Published in: European Radiology / Issue 11/2017
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-017-4863-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Do we need 3D tube current modulation information for accurate organ dosimetry in chest CT? Protocols dose comparisons

Abstract

Objectives

Method

Results

Conclusion

Key points

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Method

Results

Conclusion

Key points

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