Second Korean national CT diagnostic reference levels in 14 CT protocols

Congress:

ECR 2018

Poster Number:

C-2497

Type:

Scientific Exhibit

Keywords:

Radioprotection / Radiation dose, CT, Radiation safety, Quality assurance

Authors:

S.-W. Yoon¹, J. Kim², J. Kim³, S.-K. Lee³; ¹Gyunggi-Do/KR, ²Chungbuk/KR, ³Seoul/KR

DOI:

10.1594/ecr2018/C-2497

DOI-Link:

https://dx.doi.org/10.1594/ecr2018/C-2497

Fig. 1: Number of each CT protocols

Fig. 2: Screen shot of web survey system

Fig. 3: 25th and 75th Percentiles of DRLs at 14 CT protocols of Korea 2016

Fig. 4: DRLs of other country and this survey of common 13 CT protocols

Aims and objectives

Computed tomography (CT) is a powerful clinical tool for the diagnosis and management of patient’s disease. However, CT has two different aspects in which it increases diagnostic accuracy and the radiation exposure risk in population as well. Therefore, International Atomic Energy Agency (IAEA) and World Health Organization (WHO) recommended the diagnostic reference levels (DRLs) of CT examinations to patients in each country and regions. [1-3] At 2016, we performed the nationwide survey and analyzed DRLs of 14 CT protocols under the direction of the Korean...

Methods and materials

This survey was compiled witht the Health Insurance and Portability and Accountability Act and approved by institutional review boards prospectively; the need for informed consent was waived. CT dose is routinely estimated by using standard 16- or 32-cm diameter cylinder phantoms representing "average" patients.[4] We collected the data of CTDIvol, DLP, X-ray tube current, scan length, patient height, weight, and age in 14 most common CT protocols from October 2016 to August 2017. We collected 13,625 CT examinations of 14 protocols from 369 CT systems....

Results

For the brain CT without contrast, DRLs of CTDIvol and DLP were shown to be 63.70 mGy, 1119.40 mGy·cm. Intracranial CT angiography showed DRLs of CTDIvol 21.80 mGy, DLP 836.27 mGy·cm. Cervical spine CT showed DRLs of CTDIvol 17.89 mGy, DLP 434.04 mGy·cm. Lumbar spine CT showed DRLs of CTDIvol 17.92 mGy, DLP 601.49 mGy·cm. Neck CT with contrast showed DRLs of CTDIvol 13.75 mGy, DLP 442.05 mGy·cm. Chest CT showed DRLs of CTDIvol 7.30 mGy, DLP 297.05 mGy·cm. Low dose screening chest CT showed...

Conclusion

This work establishes DRLs by using data from the largest source in the nationwide survey of CT dose information from actual patient examinations. The survey included 369 CT systems, of those were about 20 % of nationwide installed CT system. The use of DRLs has been shown to reduce the overall dose and the range of doses observed in clinical practice. For example, in the United Kingdom, DRLs of 2005 for radiography, fluoroscopy, and dental x-rays were approximately 16% lower than those in DRLs of...

Personal information

References

[1] International Atomic Energy Agency. International basics safety standards for protection against ionizing radiation and the safety of radiation sources. Safety Series, No. 115 (Vienna: IAEA) pp. 278–280 (1996). [2] International Commission on Radiological Protection. 1990 Recommendation of the international commission on radiological protection, ICRP publication 60, Annals of the ICRP Vol. 21(1–3) (Elsevier Press) (1991) ISBN-10: 0-08-041144-4. [3] International Commission on Radiological Protection. Radiological protection and safety in medicine, ICRP publication 73. Annals of the ICRP Vol. 26(2) (Elsevier Press) (1996) ISBN-10: 0-08-042738-3, ISBN13:...