scholarly journals Anatomic study of the carpal tunnel in adults using monoenergetic reconstruction of dual-energy computed tomography

2020 ◽  
pp. 1-17
Author(s):  
Heng Zhao ◽  
Fei Peng ◽  
De qiu Tang ◽  
Jin cai Liu ◽  
Hao Lei ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Quantitative Analysis ◽  
Energy Spectrum ◽  
Soft Tissue ◽  
Image Quality ◽  
Carpal Tunnel ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Tissue Structures ◽  
Monoenergetic Images

Abstract Purpose: To seek optimal keV settings for imaging carpal tunnel in adults by dual-energy computed tomography (DECT) monoenergetic technique; to describe anatomic characteristics of carpal tunnel and to observe correlation between carpal bony and soft tissue structures. Methods: DECT images of 20 wrists (11 left and 9 right wrists; 14 men, mean age 26.93 ± 1.38 years, range 23 to 28, and 6 women, mean age 24.17 ± 0.98 years, range 23 to 26) were evaluated. Monoenergetic images were reconstructed at 42, 62, 82, 102, 122, and 142 keV. Image quality was assessed along a 5-point Likert scale, and the highest-quality images were chosen for quantitative analysis. Two musculoskeletal radiologists performed both analyses independently. Results: The optimal energy spectrum with the best contrast-to-noise ratio (CNR) for monoenergetic images were at 62 keV (19 wrists, 95%) and 61 keV (1 wrist, 5%). There was substantial interobserver agreement between the readers in the 5-point Likert scale analysis of image quality (? = 0.793). Bland-Altman plots also indicated good agreement between observers in quantitative analysis. Intra-category 1 and 2 correlation was mostly discovered at hamate hook level and middle level of pisiform (P < 0.05), while bony and soft tissue structures partly reached correlation (P < 0.05). Conclusion: The optimal energy spectrum for monoenergetic DECT imaging of carpal tunnel structures was 62 keV. DECT monoenergetic imaging could predict changes in soft tissue structures and demonstrate carpal tunnel anatomic structures. Keywords: DECT, monoenergetic, keV, carpal tunnel, Continuous...

Soft tissue discrimination ex vivo by dual energy computed tomography

2010 ◽  
Vol 75 (2) ◽  
pp. e124-e128 ◽  
Author(s):  
H. Zachrisson ◽  
E. Engström ◽  
J. Engvall ◽  
L. Wigström ◽  
Ö. Smedby ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Ex Vivo ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Tissue Discrimination

Optimizing window settings for improved presentation of virtual monoenergetic images in dual-energy computed tomography

2017 ◽  
Vol 44 (11) ◽  
pp. 5686-5696 ◽  
Author(s):  
Wanyi Fu ◽  
Daniele Marin ◽  
Juan Carlos Ramirez-Giraldo ◽  
Kingshuk Roy Choudhury ◽  
Justin Solomon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Virtual Monoenergetic Images ◽  
Monoenergetic Images

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.

Sign in / Sign up

Export Citation Format

Share Document