Dual source CT (DSCT) imaging of obese patients: evaluation of CT number accuracy, uniformity, and noise

2009 ◽  
Author(s):  
A. Walz-Flannigan ◽  
B, Schmidt ◽  
A. Apel ◽  
C. Eusemann ◽  
L. Yu ◽  
...  
Keyword(s):  
Obese Patients ◽  
Dual Source Ct ◽  
Ct Number ◽  
Dual Source

An online cross-scatter correction algorithm for dual-source CT: effects on CT number accuracy and noise

2009 ◽  
Author(s):  
Christian D. Eusemann ◽  
Anja Apel ◽  
Bernhard Schmidt ◽  
Alisa I. Walz-Flannigan ◽  
Megan C. Jacobsen ◽  
...  
Keyword(s):  
Scatter Correction ◽  
Dual Source Ct ◽  
Correction Algorithm ◽  
Ct Number ◽  
Dual Source ◽  
Cross Scatter

scholarly journals Radiation dose and image quality of high-pitch emergency abdominal CT in obese patients using third-generation dual-source CT (DSCT)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Robert Forbrig ◽  
Michael Ingrisch ◽  
Robert Stahl ◽  
Katharina Stella Winter ◽  
Maximilian Reiser ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Third Generation ◽  
Obese Patients ◽  
Dual Source Ct ◽  
High Pitch ◽  
Subjective Image Quality ◽  
Dual Source ◽  
Group A

Abstract In this third-generation dual-source CT (DSCT) study, we retrospectively investigated radiation dose and image quality of portal-venous high-pitch emergency CT in 60 patients (28 female, mean age 56 years) with a body mass index (BMI) ≥ 30 kg/m2. Patients were dichotomized in groups A (median BMI 31.5 kg/m2; n = 33) and B (36.8 kg/m2; n = 27). Volumetric CT dose index (CTDIvol), size-specific dose estimate (SSDE), dose length product (DLP) and effective dose (ED) were assessed. Contrast-to-noise ratio (CNR) and dose-independent figure-of-merit (FOM) CNR were calculated. Subjective image quality was assessed using a five-point scale. Mean values of CTDIvol, SSDE as well as normalized DLP and ED were 7.6 ± 1.8 mGy, 8.0 ± 1.8 mGy, 304 ± 74 mGy * cm and 5.2 ± 1.3 mSv for group A, and 12.6 ± 3.7 mGy, 11.0 ± 2.6 mGy, 521 ± 157 mGy * cm and 8.9 ± 2.7 mSv for group B (p < 0.001). CNR of the liver and spleen as well as each calculated FOM CNR were significantly higher in group A (p < 0.001). Subjective image quality was good in both groups. In conclusion, third-generation abdominal high-pitch emergency DSCT yields good image quality in obese patients. Radiation dose increases in patients with a BMI > 36.8 kg/m2.

Coronary CT angiography in obese patients using 3rd generation dual-source CT: effect of body mass index on image quality

2015 ◽  
Vol 26 (9) ◽  
pp. 2937-2946 ◽  
Author(s):  
Stefanie Mangold ◽  
Julian L. Wichmann ◽  
U. Joseph Schoepf ◽  
Sheldon E. Litwin ◽  
Christian Canstein ◽  
...  
Keyword(s):  
Body Mass Index ◽  
Image Quality ◽  
Ct Angiography ◽  
Body Mass ◽  
Coronary Ct Angiography ◽  
Obese Patients ◽  
Dual Source Ct ◽  
Coronary Ct ◽  
Dual Source

scholarly journals Advanced Noise-Optimized Dual-Energy Virtual Monochromatic Imaging vs. Conventional 120-kVp CT Imaging: Image Quality Assessment

2021 ◽  
Author(s):  
Adnan Honardari ◽  
Ahmad Bitarafan-Rajabi ◽  
Razieh Solgi ◽  
Mahsa Shakeri ◽  
Kiara Rezaei-Kalantari ◽  
...  
Keyword(s):  
Image Quality ◽  
Noise Reduction ◽  
Contrast Material ◽  
Ct Images ◽  
Dual Energy ◽  
Image Noise ◽  
Dual Source Ct ◽  
Ct Number ◽  
Dual Source ◽  
Improvement Ratio

Purpose: This study aimed at evaluating the image quality characteristics of advanced noise-optimized and traditional virtual monochromatic images compared with conventional 120-kVp images from second-generation Dual-Source CT. Materials and Methods: For spiral scans six syringes filled with diluted iodine contrast material (1, 2, 5, 10, 15, 20 mg I/ml) were inserted into the test phantom and scanned with a second-generation dual-source CT in both single-energy (120-kVp) and dual-energy modes. Images set contain conventional single-energy 120-kVp, and virtual monochromatic were reconstructed with energies ranging from 40 to 190-keV in 1-keV steps. An energy-domain noise reduction algorithm was applied and the mean CT number, image noise, and iodine CNR were calculated. Results: The iodine CT number of conventional 120-kVp images compared with monochromatic of 40-, 50-, 60- and 70-keV images showed increase. The improvement ratio of image noise on Advanced Virtual Monochromatic Images (AVMIs) compared with the Traditional Virtual Monochromatic Images (TVMIs) at energies of 40-, 50-, 60, 70-keV was 52.9%, 35.7%, 8.1%, 2.1%, respectively. At AVMIs from 75- to 190-keV, the image noise value was less than conventional 120-kVp images. CNR improvement ratio at 20 mg/ml of iodinated contrast material for TVMIs and AVMIs compared to 120-kVp CT images and AVMIs compared to TVMI was 18.3% and 56.3%, 32.1% respectively. Conclusion: Both TVMIs (in energies ranging from 54 to 71-keV) and AVMIs (in energies ranging from 40 to 74-keV) represent improvement in the iodine contrast-to-noise ratio than conventional 120-kVp CT images for the same radiation dose. Also, AVMIs compared to TVMIs have been obtained considerable noise reduction and CNR improvement for low-energy virtual monochromatic images. In the present study, we show that virtual monochromatic image and its Advanced version (AVMI) may boost the dual-energy CT advantages by providing higher CNR images in the same exposure value compared to routinely acquired single-energy CT images.

Dual Source CT Coronary Angiography in Severely Obese Patients

2009 ◽  
Vol 44 (11) ◽  
pp. 720-727 ◽  
Author(s):  
Sebastian Leschka ◽  
Bjoern Stinn ◽  
Florian Schmid ◽  
Bernd Schultes ◽  
Martin Thurnheer ◽  
...  
Keyword(s):  
Coronary Angiography ◽  
Ct Coronary Angiography ◽  
Obese Patients ◽  
Dual Source Ct ◽  
Severely Obese ◽  
Dual Source
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