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Usefulness of a lead shielding device for reducing the radiation dose to tissues outside the primary beams during CT

 Jae-Joon Chung  ;  Eun-Suk Cho  ;  Sung Min Kang  ;  Jeong-Sik Yu  ;  Dae Jung Kim , Joo Hee Kim 
 RADIOLOGIA MEDICA, Vol.119(12) : 951-957, 2014 
Journal Title
Issue Date
Adolescent ; Adult ; Breast/radiation effects ; Female ; Humans ; Lead* ; Male ; Middle Aged ; Radiation Dosage* ; Radiation Protection/methods ; Radiation-Protective Agents* ; Skin/radiation effects ; Thyroid Gland/radiation effects ; Tomography, X-Ray Computed* ; Young Adult
PURPOSE: This study was done to investigate the efficacy of a lead shield in protecting the tissues outside the primary beams, such as the breast and thyroid, by measurement of the entrance skin dose during CT of the brain, neck, abdomen, and lumbar spine.

MATERIALS AND METHODS: Institutional Review Board approval was obtained. This study included 150 patients (male:female 25:125, age range 15-45 years). In females, brain, lumbar spine, and abdominal CT scans, pre-/post-contrast neck CT scans, and post-contrast liver dynamic CT scans were performed. In males, brain CT scans only were performed. Breast shielding was performed in all females, and thyroid shielding was conducted in patients with brain CT. During all CT studies, the left breast or left thyroid was shielded using a lead shield, and the contralateral side was left unshielded. Thus, each breast or thyroid measurement had its own control for the same demographic data. The efficacy of the shielding of both breasts and thyroids during CT was assessed.

RESULTS: During brain, abdominal, lumbar, pre-/post-contrast neck, and post-contrast liver dynamic CT, 33.5, 26.0, 17.4, 26.5, and 16.2 % of the breast skin dose were reduced, respectively. During brain CT, the thyroid skin dose was reduced by 17.9 % (females) and 20.6 % (males). There were statistically significant differences in the skin doses of shielded organs (p < 0.05). Breast shielding during neck and liver dynamic CT was the most effective compared with breast or thyroid shielding during other CT scans.

CONCLUSIONS: We recommend breast shielding during neck and liver dynamic CT in young female patients to avoid unnecessary radiation exposure.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Joo Hee(김주희) ORCID logo https://orcid.org/0000-0001-5383-3602
Yu, Jeong Sik(유정식) ORCID logo https://orcid.org/0000-0002-8171-5838
Chung, Jae Joon(정재준) ORCID logo https://orcid.org/0000-0002-7447-1193
Cho, Eun Suk(조은석)
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