Optimization of Radiation Dose in Cranial Computed Tomography among Adults: Assessment of Radiation Dose against Image Quality

被引：0

作者：

Okoro N.O.E. ^{[1
]}

Changizi V. ^{[2
]}

Ghareh Bagh E.J. ^{[2
]}

Pak F. ^{[2
]}

机构：

[1] Department of Radiology and Radiotherapy Technology, International Campus, Tehran University of Medical Sciences, Tehran

[2] Department of Radiology and Radiotherapy Technology, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran

来源：

Iranian Journal of Medical Physics | 2020年 / 17卷 / 05期

关键词：

Computed Tomography; Image Quality; Optimization; Radiation Dose;

D O I：

10.22038/ijmp.2019.40477.1565.

中图分类号：

学科分类号：

摘要：

Introduction: The rapid use of computed tomography (CT) scan is of great concern, due to increase in patients’ dose. Optimization of CT protocol is a vital issue in dose reduction. This study aimed to optimize radiation dose in cranial CT and assess modifications in image quality under radiation dose reduction. Material and Methods: A poly(methyl methacrylate) phantom was used for quality control test on CT scanners. Data of 214 scan parameters, dose indicators; volume CT dose index (CTDIvol) and dose-length product (DLP) of patients who underwent cranial CT scans were collected. The data were grouped into three, with respect to the slice numbers of 24, 28, and 32. Tube voltage (kVp) and slice thickness were constant; (110 kVp and 4.8 mm, respectively), at variable tube currents (mAs). A one-sample t-test was used to compare the dose indicator values of the hospital protocol with a recommended protocol. Scan parameters were optimized for radiation dose against image quality. Results: Increased mAs resulted in increased CTDIvol and DLP at constant kVp and slice thickness. Moreover, dose indicators recorded the lowest and highest values at the slice numbers of 24 and 32, respectively. An increase in slice numbers affected dose indicators. Dose indicators recorded significant reduction (P<0.001) in comparison to the recommended protocol. Conclusion: Optimization of CT protocol considers radiation dose and image quality. Radiologists adopted protocols acquired with lower scan parameters and dose indicators lower than the recommended achievable dose limit of 58 mGy. © xxxx **

引用

页码：322 / 330

页数：8

共 38 条

[1]

Kim JS, Kwon SM, Kim JM, Yoon SW., New organ-based tube current modulation method to reduce the radiation dose during computed tomography of the head: evaluation of image quality and radiation dose to the eyes in the phantom study, Radiol Med, 122, pp. 601-608, (2017)

[2]

Koral K, Blackburn T, Bailey A, Koral K, Anderson J., Strengthening the argument for rapid brain MR imaging: estimation of reduction in lifetime attributable risk of developing fatal cancer in children with shunted hydrocephalus by instituting a rapid brain MR imaging protocol in lieu of head CT, AJNR Am J Neuroradiol, 33, pp. 1851-1854, (2012)

[3]

Davis F, Il'Yasova D, Rankin K, McCarthy B, Bigner DD., Medical diagnostic radiation exposures and risk of gliomas, Radiat Res, 175, pp. 790-796, (2011)

[4]

Bassim MK, Ebert CS, Sit RC, Senior BA., Radiation dose to the eyes and parotids during CT of the sinuses, Otolaryngol Head Neck Surg, 133, pp. 531-533, (2005)

[5]

McLaughlin D, Mooney R., Dose reduction to radiosensitive tissues in CT. Do commercially available shields meet the users’ needs?, Clin Radiol, 59, pp. 446-450, (2004)

[6]

Heaney D, Norvill C., A comparison of reduction in CT dose through the use of gantry angulations or bismuth shields, Australas Phys Eng Sci Med, 29, pp. 172-178, (2006)

[7]

Abada HT, Larchez C, Daoud B, Sigal-Cinqualbre A, Paul JF., MDCT of the coronary arteries: feasibility of low-dose CT with ECG-pulsed tube current modulation to reduce radiation dose, AJR Am J Roentgenol, 186, pp. 387-390, (2006)

[8]

Heyer CM, Mohr PS, Lemburg SP, Peters SA, Nicolas V., Image quality and radiation exposure at pulmonary CT angiography with 100-or 120-kVp protocol: prospective randomized study, Radiology, 245, pp. 577-583, (2007)

[9]

Kalra MK, Maher MM, Toth TL, Schmidt B, Westerman BL, Morgan HT, Et al., Techniques and applications of automatic tube current modulation for CT, Radiology, 233, pp. 649-657, (2004)

[10]

Nakayama Y, Awai K, Funama Y, Liu D, Nakaura T, Tamura Y, Et al., Lower tube voltage reduces contrast material and radiation doses on 16-MDCT aortography, AJR Am J Roentgenol, 187, pp. 490-497, (2006)

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