Computed tomography overexposure as a consequence of extended scan length

Journal of Medical Imaging and Radiation Oncology - Tập 59 Số 5 - Trang 586-589 - 2015
Mohamed Khaldoun Badawy1,2, Michael Galea3, Kam Mong1, Udo Paul1
1Department of Medical Physics, Austin Health, Heidelberg, Victoria, Australia
2School of Medical Sciences, RMIT, Bundoora, Victoria, Australia
3Department of Radiology, Austin Health, Heidelberg, Victoria, Australia

Tóm tắt

AbstractIntroductionThis study aimed to raise awareness around the increased effective dose as scan length chosen is increased from standard protocolMethodsThe Monte Carlo‐based software CT‐Expo (G. Stamm (Medizinische Hochschule Hannover, Hannover, Germany) and H.D. Nagel (SASCRAD, Buchholz, Germany)) was used to simulate the effective dose increase as the scanned region of the standard protocol increased.ResultsThe results of this study show that for scans with a high computed tomography dose index (CTDI)vol the patient could be exposed to an extra 1 mSv within 6 cm of overscan. Protocols that investigated large scan areas may not see a significant relative dose reduction because of the use of a lower CTDIvol; however, radiation exposure should be kept as low as reasonably achievable.ConclusionThere is significant dose optimisation potential when strictly adhering to appropriate scan lengths within each imaging protocol wherever possible.

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Thông tin
Thông tin xuất bản

Journal of Medical Imaging and Radiation Oncology

Tập 59 Số 5

586-589

Thông tin tác giả