TH-C-103-10: AIR: Fused Analytical and Iterative Reconstruction Method for Computed Tomography

2013 ◽  
Vol 40 (6Part33) ◽  
pp. 544-544 ◽  
Author(s):  
L Yang ◽  
S Qi ◽  
H Gao
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Reconstruction Method

scholarly journals Usefulness of Iterative Reconstruction Method in the Field of Acute Cerebral Infarction Computed Tomography Examination

2015 ◽  
Vol 71 (11) ◽  
pp. 1090-1095
Author(s):  
Keiji Tada ◽  
Koji Uchida ◽  
Hidekazu Kanayama ◽  
Takafumi Kajitani ◽  
Yasushi Yamamoto ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cerebral Infarction ◽  
Iterative Reconstruction ◽  
Acute Cerebral Infarction ◽  
Reconstruction Method

scholarly journals COMPARISON OF DIAGNOSTIC AND RADIOTHERAPY PLANNING PROTOCOLS IN LUNG CANCER TREATMENT

2020 ◽  
Vol 37 (2) ◽  
pp. 13-18
Author(s):  
Filip VLAJ ◽  
Valerija ŽAGER MARCIUŠ ◽  
Katja ŠKALIČ
Keyword(s):  
Computed Tomography ◽  
Lung Cancer ◽  
Iterative Reconstruction ◽  
Radiation Treatment ◽  
Reconstruction Method ◽  
Standard Protocol ◽  
Computed Tomography Imaging ◽  
Imaging Protocol ◽  
Dose Load ◽  
Tomography Imaging

Purpose: The purpose of the study was to compare a standard diagnostic protocol for computed tomography imaging on a positron emission tomography scanner at the Department of Nuclear Medicine, and a radiotherapy imaging protocol for pre-planning needs in radiotherapy for lung cancer treatment, to determine the differences between these two protocols and to propose possible improvements in the dose optimisation for computed tomography imaging in a radiotherapy protocol. Methods: In this retrospective study, data were collected via the SyngoVia program and statistically analysed according to the patient dose load in computed tomography imaging in standard and radiotherapy protocols. The analysis encompassed data on a total of 56 patients in the period from 1 January 2017 to 1 December 2018. We compared data on patient dose load in computed tomography imaging in a standard protocol before and after the introduction of the improved sinogram-affirmed iterative reconstruction method (SAFIRE). Results and discussion: It was established that there are statistically significant differences in dose per patient (p<) in computed tomography imaging in standard and radiotherapy protocols. Statistically significant differences were also established in computed tomography imaging in the standard protocol before and after the introduction of the improved iterative reconstruction method (p=0,001). Dose load on the lung in computed tomography imaging was 67.5% lower in the standard protocol with the iterative reconstruction in image space (IRIS) method than in the radiotherapy protocol. The introduction of the improved SAFIRE method additionally lowered the dose per patient by 34.2% compared to the IRIS method. Conclusion: In the future, the introduction of the improved iterative reconstruction method is possible for the reconstruction of tomographic images, including for radiotherapy imaging protocol that takes into account the impact of the indirect reduction in the dose on the accuracy of the identification of tumour target volumes when planning radiation treatment for the patient. Key words: positron emission tomography with computed tomography, iterative reconstruction, dose optimization, lung cancer, radiation treatment planning

scholarly journals Physics‐Based Iterative Reconstruction for Dual Source and Flying Focal Spot Computed Tomography

2021 ◽  
Author(s):  
Xiao Wang ◽  
Robert D. MacDougall ◽  
Peng Chen ◽  
Charles A. Bouman ◽  
Simon K. Warfield
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Focal Spot ◽  
Dual Source

Dynamics of the right atrio-ventricular junction in human: a spatial high-resolution study with multiphase computed tomography

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
J Jouan ◽  
I Masari ◽  
V Bliah ◽  
G Soulat ◽  
D Craiem ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cardiac Cycle ◽  
Cardiac Computed Tomography ◽  
Reconstruction Method ◽  
Imaging Data ◽  
High Definition ◽  
Vertical Projection ◽  
Horizontal Projection ◽  
Cross Sectional ◽  
The Right

Abstract Introduction In order to improve knowledge of the tricuspid valve (TV) function and its coupling with the right atrio-ventricular junction (RAVJ) and right ventricle (RV), new four-dimensional high-definition imagery methods are mandatory (3D+t). Purpose Using an innovative reconstruction method based on multiphase cardiac computed tomography imaging (4D-MCCTI), we finely analyzed the morphological & dynamical features of tricuspid annulus (TA) and RAVJ components in order to assess new functional parameters of TV and RV functions. Methods Volume imaging data sets through time were obtained from 4D-MCCTI of 30 subjects (sex ratio 1, mean age 57±11y.) with no rhythm, valvular or ventricular abnormalities on echocardiography and implemented in a custom software for 3D semi-automated delineation of 18 points around TA perimeter. Coordinates of these points in each of the 10 time-phases within an RR interval were used to calculate specific geometrical features of TA such as 3D/2D areas, perimeters, 360°-diameters and vertical deformation. Subsequently, RV and Right Atrium (RA) inner contours were also delineated (Figure). Results TA shape was elliptical in horizontal projection with a mean eccentricity index (EcI) of 0.58±0.12; and saddle-shapped in vertical projection with a horn nearby the antero-septal commissure. This feature remained throughout the cardiac cycle but TA was more planar (minimal TA-height: 4.47±1.04 mm) and circular (minimal EcI=0.44±0.14) in mid-diastole when TA-3Darea and TA-3Dperimeter reached a maximum of 6.98±1.21 cm2/m2 and 7.41±0.91 cm, respectively. Correlation between TA-3Darea, TA-2Darea and latero-septal diameter (LSD) were R2=0.99 and R2=0.73, respectively. LSD was minimal in early-systole (18.83±3.04 mm/m2) and maximal in mid-diastole (20.04±3.05 mm/m2). Correlation of TA-3Darea with RV and RA cross-sectional areas were R2=0.82 and R2=0.71, respectively. Conversely, there was no significant correlation between TA, RV and RA concentric contractions. Conclusions Our method for 4D-MTCCI analysis has allowed confirming the shape and dynamics function of RAVJ throughout the cardiac cycle in healthy subjects, and giving new reference parameters for TV and RV evaluation. Software multiplanar view of TA Funding Acknowledgement Type of funding source: None

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