Comparison of Image Quality and Radiation Dose between High-Pitch Mode and Low-Pitch Mode Spiral Chest CT in Small Uncooperative Children: The Effect of Respiratory Rate

Seong Ho Kim, Young Hun Choi, Hyun Hae Cho, So Mi Lee, Su Mi Shin, Jung Eun Cheon, Woo Sun Kim, In One Kim

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Objectives: To compare image quality and radiation dose between high-pitch mode (HPM) and low-pitch mode (LPM) CT in young children. Materials and methods: Forty-seven children (mean age 35.6 months; range, 0–126 months) underwent 49 CT examinations in HPM or LPM and were divided into high or low respiratory rate (RR) groups. A qualitative image quality was compared between the two modes. The volume CT dose index (CTDIvol) and dose-length product (DLP) were evaluated from the dose reports, and effective doses were assessed using a paediatric phantom. Results: Image quality was generally better for HPM than LPM (diagnostic acceptance score, 4.00 vs. 3.46, P = 0.004); the difference was more prominent in the high RR group (4.00 vs. 3.22, P = 0.001). However, there was no significant difference in the low RR group. The mean DLP value was higher in HPM than LPM (29.48 mGy · cm vs. 23.46 mGy · cm, P = 0.022), while CTDIvol was not significantly different. The total effective radiation dose was 26 % higher in HPM than LPM (1.82 mSv vs. 1.44 mSv). Conclusions: LPM can be considered for paediatric lung evaluation in young children with low RRs to reduce radiation dose while maintaining favourable image quality. Key Points: • Radiation exposure is higher onhigh-pitch “Flash spiral mode” than onlow-pitch “X-CARE mode”. • “Flash spiral mode” generally showed better image quality than “X-CARE mode”. • Difference in image quality was more prominent in the high RR group. • There was no difference in image quality in the low RR group. • “X-CARE mode” should be considered in a limited population with low RRs.

Original languageEnglish
Pages (from-to)1149-1158
Number of pages10
JournalEuropean Radiology
Volume26
Issue number4
DOIs
StatePublished - 1 Apr 2016

Bibliographical note

Publisher Copyright:
© 2015, European Society of Radiology.

Keywords

  • Child
  • Multidetector Computed Tomography
  • Pediatrics
  • Radiation
  • Thorax

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