Real-time estimation of dose reduction for pediatric CT using bismuth shielding

Nan Ku Lai, Ying Lan Liao, Tuo Rong Chen, Yu Sheng Tyan, Hui Yu Tsai*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

8 Scopus citations


The purpose of this study is to estimate the dose reduction of bismuth shielding for pediatric CT using a real-time CT dose probe. Routine CT examinations of head, chest and abdomen were performed on a 10-year pediatric anthropomorphic phantom, with and without bismuth shield. A solid-state dosimeter was used to obtain real-time dose measurements and to estimate the dose reduction. The maximum dose reduction of eyes using bismuth shield for in-plane CT scanning can achieve 56% during spiral head scanning interval. The average dose reduction is around 25% for in-plane CT scanning, and reaches 62% combining the technique of automatic tube current modulation. The solid-state probe can provide fast and convenient measurements for dose estimation of superficial organs. It is suggested to use Bismuth shielding in routine CT examinations to protect the radiosensitive tissues.

Original languageEnglish
Pages (from-to)2039-2043
Number of pages5
JournalRadiation Measurements
Issue number12
StatePublished - 12 2011
Externally publishedYes


  • Bismuth shielding
  • Pediatric CT imaging
  • Radiosensitive organ/tissue
  • Real-time dose measurement


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