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Radiation Dose Reduction via Sinogram Affirmed Iterative Reconstruction and Automatic Tube Voltage Modulation (CARE kV) in Abdominal CT

Authors
 Hyun Joo Shin  ;  Yong Eun Chung  ;  Young Han Lee  ;  Jin-Young Choi  ;  Mi-Suk Park  ;  Myeong-Jin Kim  ;  Ki Whang Kim 
Citation
 Korean Journal of Radiology, Vol.14(6) : 886-893, 2013 
Journal Title
 Korean Journal of Radiology 
ISSN
 1229-6929 
Issue Date
2013
MeSH
Adult ; Aged ; Aged, 80 and over ; Algorithms* ; Equipment Design ; Female ; Humans ; Male ; Middle Aged ; Multidetector Computed Tomography/adverse effects ; Multidetector Computed Tomography/instrumentation* ; Radiation Dosage ; Radiation Injuries/etiology ; Radiation Injuries/prevention & control* ; Radiographic Image Interpretation, Computer-Assisted/methods* ; Radiography, Abdominal/adverse effects ; Radiography, Abdominal/methods* ; Retrospective Studies
Keywords
Computed tomography ; Iterative reconstruction ; Radiation dose reduction ; Tube voltage modulation
Abstract
OBJECTIVE: To evaluate the feasibility of sinogram-affirmed iterative reconstruction (SAFIRE) and automated kV modulation (CARE kV) in reducing radiation dose without increasing image noise for abdominal CT examination. MATERIALS AND METHODS: This retrospective study included 77 patients who received CT imaging with an application of CARE kV with or without SAFIRE and who had comparable previous CT images obtained without CARE kV or SAFIRE, using the standard dose (i.e., reference mAs of 240) on an identical CT scanner and reconstructed with filtered back projection (FBP) within 1 year. Patients were divided into two groups: group A (33 patients, CT scanned with CARE kV); and group B (44 patients, scanned after reducing the reference mAs from 240 to 170 and applying both CARE kV and SAFIRE). CT number, image noise for four organs and radiation dose were compared among the two groups. RESULTS: Image noise increased after CARE kV application (p < 0.001) and significantly decreased as SAFIRE strength increased (p < 0.001). Image noise with reduced-mAs scan (170 mAs) in group B became similar to that of standard-dose FBP images after applying CARE kV and SAFIRE strengths of 3 or 4 when measured in the aorta, liver or muscle (p ≥ 0.108). Effective doses decreased by 19.4% and 41.3% for groups A and B, respectively (all, p < 0.001) after application of CARE kV with or without SAFIRE. CONCLUSION: Combining CARE kV, reduction of mAs from 240 to 170 mAs and noise reduction by applying SAFIRE strength 3 or 4 reduced the radiation dose by 41.3% without increasing image noise compared with the standard-dose FBP images.
Files in This Item:
T201304490.pdf Download
DOI
10.3348/kjr.2013.14.6.886
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Ki Whang(김기황)
Kim, Myeong Jin(김명진) ORCID logo https://orcid.org/0000-0001-7949-5402
Park, Mi-Suk(박미숙) ORCID logo https://orcid.org/0000-0001-5817-2444
Lee, Young Han(이영한) ORCID logo https://orcid.org/0000-0002-5602-391X
Chung, Yong Eun(정용은) ORCID logo https://orcid.org/0000-0003-0811-9578
Choi, Jin Young(최진영) ORCID logo https://orcid.org/0000-0002-9025-6274
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/88695
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