Low‐dose computed tomography scheme incorporating residual learning‐based denoising with iterative reconstruction

2019 ◽  
Vol 55 (4) ◽  
pp. 174-176 ◽  
Author(s):  
Yong Ding ◽  
Tuo Hu
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
Residual Learning ◽  
Low Dose Computed Tomography ◽  
Tomography Scheme

scholarly journals Low Dose Computed Tomography in Diagnosis of Ureteric Calculus in Obese Patients

2020 ◽  
Vol 9 (1) ◽  
pp. 27-31
Author(s):  
Mahesh Gautam ◽  
Aziz Ullah ◽  
Manish Raj Pathak
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Dose ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
Standard Dose ◽  
Reconstruction Technique ◽  
Obese Patients ◽  
Low Dose Computed Tomography ◽  
Effective Radiation

Background: Standard dose computed tomography is standard imaging modality in diagnosis of urolithiasis. The introduction of low dose techniques results in decrease radiation dose without significant change in image quality. However, the image quality of low dose computed tomography is affected by skin fold thickness and subcutaneous abdominal adipose tissue. The aim of this study to evaluate stone location, size, and density using low dose computed tomography compared with standard dose computed tomography in obese population. Material and Methods: This non-randomized non-inferiority trial includes 120 patient having BMI≥25kg/m2 with acute ureteric colic. The low dose and standard dose computed tomography were performed accordingly. Effective radiation doses were calculated from dose-length product obtained from scan report using conversion factor of 0.015. The images were reconstructed using iterative reconstruction algorithm. Effective dose, number and size of stone, Hounsfield Unit value of stone and image quality was assessed. Results: Stones were located in 69 (57.5%) in right and 51 (42.5%) in left ureter. There was no statistical difference in mean diameter, number and density of stones in low dose as compared with standard dose. The radiation dose was significantly lower with low dose. (3.68 mSv) The delineation of the ureter, outline of the stones and image quality in low dose was overall sufficient for diagnosis. No images of low dose scan were subjectively rated as non-diagnostics. Conclusion: Low dose computed tomography with iterative reconstruction technique is as effective as standard dose in diagnosis of ureteric stones in obese patients with lower effective radiation dose.

LOW-DOSE COMPUTED TOMOGRAPHY OF THE PARANASAL SINUSES: PERFORMANCE OF TWO DIFFERENT ITERATIVE RECONSTRUCTION ALGORITHMS

2018 ◽  
Vol 183 (3) ◽  
pp. 386-392 ◽  
Author(s):  
Lars-Arne Schaafs ◽  
Julian Pfeil ◽  
Torsten Köhlitz ◽  
Bernd Hamm ◽  
Stefan Markus Niehues
Keyword(s):  
Computed Tomography ◽  
Paranasal Sinuses ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
Reconstruction Algorithms ◽  
Low Dose Computed Tomography

scholarly journals Low-dose computed tomography with 4th-generation iterative reconstruction algorithm in assessment of oncologic patients

2017 ◽  
Vol 9 (10) ◽  
pp. 423-430 ◽  
Author(s):  
Davide Ippolito ◽  
Alessandra Silvia Casiraghi ◽  
Cammillo Talei Franzesi ◽  
Davide Fior ◽  
Franca Meloni ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
Reconstruction Algorithm ◽  
Iterative Reconstruction Algorithm ◽  
Oncologic Patients ◽  
Low Dose Computed Tomography

Uncertainty in organ delineation using low-dose computed tomography images with high-strength iterative reconstruction technique in radiotherapy for prostate cancer

2021 ◽  
pp. 1-7
Author(s):  
Tsukasa Yoshida ◽  
Tetsuya Tomida ◽  
Atsushi Urikura ◽  
Yuki Aoyama ◽  
Yoichiro Hosokawa ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
High Strength ◽  
Ct Images ◽  
Seminal Vesicles ◽  
Radiotherapy Planning ◽  
Observer Variability ◽  
Low Dose Computed Tomography

Abstract Introduction This study aimed to investigate the uncertainty in organ delineation of low-dose computed tomography (CT) images using a high-strength iterative reconstruction (IR) during radiotherapy planning for the treatment of prostate cancer. Methods Two CT datasets were prepared with different dose levels by adjusting the reconstruction slice thickness. Two observers independently delineated the prostate, seminal vesicles, bladder and rectum on both images without referring to other modality images. The delineated organ volumes were compared between both images. Observer delineation variability was assessed using Dice similarity coefficient (DSC) and mean distance to agreement. Results No significant differences regarding the delineated organ volumes were observed between the low- and standard-dose images for all organs. Regarding inter-observer variability, the DSC was relatively high for both images, whereas mean distance to agreement was not significantly different between images (p > 0·05 for all). Intra-observer variability for each observer showed high DSC (>0·8 and >0·9 for seminal vesicles and other organs, respectively) but no significant differences in the mean distance to agreement (p > 0·05 for all). Conclusions Our results indicate that low-dose CT images with high-strength IR would be available for organ delineation in the radiotherapy treatment planning for prostate cancer.

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