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. 2018 Sep;28(9):3929-3935.
doi: 10.1007/s00330-018-5350-1. Epub 2018 Mar 28.

Radiation exposure during CT-guided biopsies: recent CT machines provide markedly lower doses

Nika Guberina  1 , Michael Forsting  2 , Adrian Ringelstein  2 , Saravanabavaan Suntharalingam  2 , Kai Nassenstein  2 , Jens Theysohn  2 , Axel Wetter  2
Affiliations

Radiation exposure during CT-guided biopsies: recent CT machines provide markedly lower doses

Nika Guberina et al. Eur Radiol. 2018 Sep.

Abstract

Objectives: To examine radiation dose levels of CT-guided interventional procedures of chest, abdomen, spine and extremities on different CT-scanner generations at a large multicentre institute.

Materials and methods: 1,219 CT-guided interventional biopsies of different organ regions ((A) abdomen (n=516), (B) chest (n=528), (C) spine (n=134) and (D) extremities (n=41)) on different CT-scanners ((I) SOMATOM-Definition-AS+, (II) Volume-Zoom, (III) Emotion6) were included from 2013-2016. Important CT-parameters and standard dose-descriptors were retrospectively examined. Additionally, effective dose and organ doses were calculated using Monte-Carlo simulation, following ICRP103.

Results: Overall, radiation doses for CT interventions are highly dependent on CT-scanner generation: the newer the CT scanner, the lower the radiation dose imparted to patients. Mean effective doses for each of four procedures on available scanners are: (A) (I) 9.3mSv versus (II) 13.9mSv (B) (I) 7.3mSv versus (III) 11.4mSv (C) (I) 6.3mSv versus (II) 7.4mSv (D) (I) 4.3mSv versus (II) 10.8mSv. Standard dose descriptors [standard deviation (SD); CT dose indexvol (CTDIvol); dose-length product (DLPbody); size-specific dose estimate (SSDE)] were also compared.

Conclusion: Effective dose, organ doses and SSDE for various CT-guided interventional biopsies on different CT-scanner generations following recommendations of the ICRP103 are provided. New CT-scanner generations involve markedly lower radiation doses versus older devices.

Key points: • Effective dose, organ dose and SSDE are provided for CT-guided interventional examinations. • These data allow identifying organs at risk of higher radiation dose. • Detailed knowledge of radiation dose may contribute to a better individual risk-stratification. • New CT-scanner generations involve markedly lower radiation doses compared to older devices.

Keywords: Image-guided biopsy; Ionizing radiation; Multidetector computed tomography; Radiation exposure; Radiation monitoring.

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