scholarly journals Image Quality and Dose Comparison of Single-Energy CT (SECT) and Dual-Energy CT (DECT)

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Ramin Ghasemi Shayan ◽  
Maryam Oladghaffari ◽  
Fakhrosadat Sajjadian ◽  
Mona Fazel Ghaziyani
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Dual Energy ◽  
Diagnostic Evaluation ◽  
Dual Energy Ct ◽  
Basic Principles ◽  
Dual Energy Computed Tomography ◽  
Dose Comparison ◽  
Single Detector ◽  
Accurate Comparison

CT and its comprehensive usage have become one of the most indispensable components in medical field especially in the diagnosis of several diseases. SECT and DECT have developed CT diagnostic potentials in several means. In this review article we have discussed the basic principles of single-energy and dual-energy computed tomography and their important physical differences which can cause better diagnostic evaluation. Moreover, different organs diagnostic evaluations through single-energy and dual-energy computed tomography have been discussed. Conventional or single-energy CT (SECT) uses a single polychromatic X-ray beam (ranging from 70 to 140 kVp with a standard of 120 kVp) emitted from a single source and received by a single detector. The concept of dual-energy computed tomography (DECT) is almost as old as the CT technology itself; DECT initially required substantially higher radiation doses (nearly two times higher than those employed in single-energy CT) and presented problems associated with spatial misregistration of the two different kV image datasets between the two separate acquisitions. The basic principles of single-energy and dual-energy computed tomography and their important physical differences can cause better diagnostic evaluation. Moreover, different organs diagnostic evaluations through single-energy and dual-energy computed tomography have been discussed. According to diverse data and statistics it is controversial to definitely indicate the accurate comparison of image quality and dose amount.

scholarly journals Radiation dose reduction in chest dual-energy computed tomography: effect on image quality and diagnostic information

2018 ◽  
Vol 51 (6) ◽  
pp. 377-384 ◽  
Author(s):  
Rodrigo Canellas ◽  
Subba Digumarthy ◽  
Azadeh Tabari ◽  
Alexi Otrakji ◽  
Shaunagh McDermott ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Dose ◽  
Dual Energy ◽  
Diagnostic Information ◽  
Lesion Detection ◽  
Kappa Statistics ◽  
Dual Energy Computed Tomography ◽  
Reduced Dose ◽  
Image Series

Abstract Objective: To determine whether dual-energy computed tomography (DECT) of the chest can be performed at a reduced radiation dose, with an emphasis on images generated with post-processing techniques. Materials and Methods: In 21 patients undergoing DECT of the chest in a dual-source scanner, an additional image series was acquired at a reduced radiation dose. Four thoracic radiologists assessed both image series for image quality, normal thoracic structures, as well as pulmonary and mediastinal abnormalities, on virtual monochromatic images at 40 keV and 60 keV. Data were analyzed with Student's t-test, kappa statistics, analysis of variance, and the Wilcoxon signed-rank test. Results: The overall image quality of 60 keV virtual monochromatic images at a reduced radiation dose was considered optimal in all patients, and no abnormalities were missed. Contrast enhancement and lesion detection performance were comparable between reduced-dose images at 40 keV and standard-of-care images at 60 keV. The intraobserver and interobserver agreement were both good. The mean volumetric CT dose index (CTDIvol), size-specific dose estimate (SSDE), dose-length product (DLP), and effective dose (ED) for reduced-dose DECT were 3.0 ± 0.6 mGy, 4.0 ± 0.6 mGy, 107 ± 30 mGy.cm, and 1.5 ± 0.4 mSv, respectively. Conclusion: DECT of the chest can be performed at a reduced radiation dose (CTDIvol < 3 mGy) without loss of diagnostic information.

Dual-Energy Computed Tomography Characterization of Urinary Calculi: Basic Principles, Applications and Concerns

2015 ◽  
Vol 44 (6) ◽  
pp. 496-500 ◽  
Author(s):  
Mohammad Mansouri ◽  
Shima Aran ◽  
Ajay Singh ◽  
Avinash R. Kambadakone ◽  
Dushyant V. Sahani ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Urinary Calculi ◽  
Dual Energy ◽  
Basic Principles ◽  
Dual Energy Computed Tomography

scholarly journals Virtual Monochromatic Image Quality from Dual-Layer Dual-Energy Computed Tomography for Detecting Brain Tumors

2021 ◽  
Vol 22 ◽  
Author(s):  
Shota Tanoue ◽  
Takeshi Nakaura ◽  
Yasunori Nagayama ◽  
Hiroyuki Uetani ◽  
Osamu Ikeda ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Brain Tumors ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Monochromatic Image ◽  
Virtual Monochromatic Image

scholarly journals Comparing image quality of single- and dual-energy computed tomography of the brain

2020 ◽  
Vol 33 (3) ◽  
pp. 259-266
Author(s):  
Doris Dodig ◽  
Slavica Kovačić ◽  
Zrinka Matana Kaštelan ◽  
Iva Žuža ◽  
Filip Benić ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Posterior Fossa ◽  
Weighted Average ◽  
Ct Images ◽  
Dual Energy ◽  
Weighting Factor ◽  
Dual Energy Computed Tomography ◽  
Noise Ratio ◽  
The Brain

Purpose Weighted average dual-energy computed tomography (DE-CT) reconstructions are considered a proxy of standard CT images of the brain, recommended for routine clinical use and used as a reference standard in DE-CT research. However, their image quality has not been assessed, which was the aim of our study. Methods Images from 81 consecutive patients who underwent both non-contrast single-energy (SE)-CT and DE-CT of the brain on the same scanner were retrospectively evaluated. Attenuation values (HU) and SD of grey matter/white matter (GM/WM) pairs, along with SD in the posterior fossa and subcalvarial region were measured. Four readers evaluated image noise, GM/WM contrast, posterior fossa and subcalvarial artefacts, as well as overall image quality. Results Weighted average DE-CT GM and WM HU were significantly lower and noise higher compared to SE-CT (GM HU 36.46 v. 41.82; WM HU 28.18 v. 29.94; GM SD 2.93 v. 2.49; and WM SD 3.16 v. 2.44, all p < 0.0001). After correcting the measured SE-CT noise for 37% higher acquisition dose, DE-CT GM noise became significantly lower (2.93 v. 3.11, p = 0.0121). Measured and dose corrected SE-CT GM/WM contrast-to-noise ratio was superior to weighted average DE-CT (3.42 and 2.74 v. 1.95, both p < 0.0001). Weighted average DE-CT had significantly less artifacts on qualitative analysis. Conclusion Weighted average DE-CT images of the brain yield less artefacts at 37% dose reduction and lower noise at SE-CT equivalent dose. Dose-adjusted GM/WM contrast-to-noise ratio of weighted average DE-CT with 0.4 weighting factor remains inferior to SE-CT images.

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