A Comparison of the Image Quality and Radiation Dose With Routine Computed Tomography and the Latest Gemstone Spectral Imaging Combination of Different Scanning Protocols in Computed Tomography Angiography of the Kidney
Autor: | Ying-jin Xu, Jin Chang, Hongna Suo, Zi-Wei Zuo, Yongxia Zhao |
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Rok vydání: | 2016 |
Předmět: |
Male
medicine.medical_specialty Image quality Computed Tomography Angiography Iterative reconstruction Signal-To-Noise Ratio Kidney Radiation Dosage Effective dose (radiation) 030218 nuclear medicine & medical imaging Body Mass Index 03 medical and health sciences 0302 clinical medicine medicine Humans Radiology Nuclear Medicine and imaging Prospective Studies Computed tomography laser mammography Image-guided radiation therapy Computed tomography angiography medicine.diagnostic_test business.industry Reproducibility of Results Industrial computed tomography Middle Aged Spectral imaging Radiographic Image Enhancement 030220 oncology & carcinogenesis Radiographic Image Interpretation Computer-Assisted Female Radiology Nuclear medicine business Algorithms |
Zdroj: | Journal of computer assisted tomography. 41(2) |
ISSN: | 1532-3145 |
Popis: | OBJECTIVE The objective of our study was to compare the image quality and radiation dose of computed tomography angiography (CTA) of the kidney in patients with different body mass indexes using routine CT and the latest gemstone spectral imaging (GSI) combination of different scanning protocols with the adaptive statistical iterative reconstruction 2.0 algorithm. METHODS A total of 90 patients who had undergone a CTA of the kidney were divided into 3 groups (A, B, and C), with 30 patients in each group. Group A underwent a routine CT examination, whereas groups B and C underwent GSI with different scanning protocols. All images were restructured using the adaptive statistical iterative reconstruction 2.0. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of all images were calculated when the kidney CTA was completed. Each subjective image evaluation used a 5-point scoring method and was conducted by 2 independent radiologists. The CT dose index of volume and the dose-length product were recorded, and the mean value was calculated. The dose-length product was converted to the effective dose. All data were compared with a 1-way analysis of variance. RESULTS The SNR, CNR, and subjective image quality in group A were significantly lower than those in groups B and C (P < 0.01). There were no significant differences in SNR, CNR, and subjective image quality between groups B and C. The effective dose of group C decreased by 46.05% and 15.03% relative to those of groups A and B, respectively (P < 0.01). CONCLUSIONS The latest GSI with different scanning protocols can more effectively reduce the radiation dose than can the routine CT scan mode for a kidney CTA while still maintaining diagnostic image quality. |
Databáze: | OpenAIRE |
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