Potential of dosage reduction of cone-beam CT dacryocystography in healthy volunteers by decreasing tube current
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ORIGINAL ARTICLE
Potential of dosage reduction of cone‑beam CT dacryocystography in healthy volunteers by decreasing tube current Zhaoyue Chen1 · Peng Wang1 · Lei Du2 · Lan Wang3 Received: 26 September 2020 / Accepted: 12 October 2020 © Japan Radiological Society 2020
Abstract Purpose Cone-beam CT dacryocystography (CBCT-DCG) is a newly developed lacrimal passage imaging technique. This pilot study aimed to determine the effect of reducing tube current on image quality and radiation dose of CBCT-DCG in healthy volunteers. Materials and methods Thirty volunteers were randomly divided into three groups of ten. Each group of subjects underwent CBCT-DCG using a tube current of 13 mA, 10 mA, and 7 mA respectively. The image quality of CBCT-DCG was assessed independently by two observers using three different scoring methods and compared among the groups. The effective dose was estimated and compared among the three different tube current groups. Results The CBCT-DCG images provided a high spatial and contrast resolution of the bony structures and the contrast medium. No significant differences were found in the image quality between different tube current groups. Compared with the 13 mA group (49.44 μSv), the effective dose for 10 mA group (38.40 μSv) and 7 mA group (27.12 μSv) decreased by 22.33% and 45.15%, respectively. Conclusion By decreasing the tube current, CBCT-DCG can be performed with a significant reduction of effective dose without loss of image quality in healthy volunteers. Keywords Cone-beam computed tomography · Cone-beam CT dacryocystography · Dacryocystography · Radiation dosage Abbreviations CBCT Cone-beam computed tomography DCG Dacryocystography CBCT-DCG Cone-beam CT dacryocystography CT-DCG Computed tomographic dacryocystography DS-DCG Digital subtraction dacryocystography DAP Dose area product
Zhaoyue Chen, Peng Wang, and Lei Du contributed equally to this work. * Zhaoyue Chen [email protected] 1
Department of Otolaryngology, Xiamen Branch, Zhongshan Hospital, Fudan University, No. 668 JinHu Road, Xiamen, China
2
Xiamen Medical College, Xiamen, China
3
Xiamen Siming District Kaiyuan Street Community Health Service Center, Xiamen, China
Introduction Epiphora is a frequent complaint of patients visiting the ophthalmology outpatient clinic, accounting for 3% of clinical visits, and can affect the quality of life. Lacrimal passage obstruction is common among patients with epiphora. The exact cause and precise location of obstruction have to be determined for further precise therapeutic planning. The reasons for obstruction can be structural, functional, or both, and the site of obstruction can be lacrimal canaliculi, lacrimal sac, or nasolacrimal duct [1]. Various forms of dacryocystography (DCG) have been developed to evaluate patients with epiphora [2]. In clinical practice, digital subtraction dacryocystography (DS-DCG) is extensively performed to identify the potential reason and location of the lacrimal passage obstructions [3]. Nevertheless, DS-DCG is
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