TU-C-103-05: Image Quality and Dose Reduction Evaluation of a New CT Iterative Reconstruction Algorithm Using Model Observers

2013 ◽  
Vol 40 (6Part26) ◽  
pp. 437-437
Author(s):  
H Tseng ◽  
J Fan ◽  
M Kupinski ◽  
P Sainath ◽  
J Hsieh
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Iterative Reconstruction ◽  
Reconstruction Algorithm ◽  
Iterative Reconstruction Algorithm ◽  
Model Observers

CT pulmonary angiography: dose reduction via a next generation iterative reconstruction algorithm

2018 ◽  
Vol 60 (4) ◽  
pp. 478-487 ◽  
Author(s):  
Andreas Sauter ◽  
Thomas Koehler ◽  
Bernhard Brendel ◽  
Juliane Aichele ◽  
Jan Neumann ◽  
...  
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Iterative Reconstruction ◽  
Low Dose ◽  
Reconstruction Algorithm ◽  
Pulmonary Angiography ◽  
Reconstruction Algorithms ◽  
Iterative Reconstruction Algorithm ◽  
Dose Levels ◽  
Rule Out

Background Computed tomography pulmonary angiography (CTPA) is the standard imaging modality for detection or rule out of pulmonary embolism (PE); however, radiation exposure is a serious concern. With iterative reconstruction algorithms a distinct dose reduction could be achievable. Purpose To evaluate a next generation iterative reconstruction algorithm for detection or rule-out of PE in simulated low-dose CTPA. Material and Methods Low-dose CT datasets with 50%, 25%, and 12.5% of the original tube current were simulated based on CTPA examinations of 92 patients with suspected PE. All datasets were reconstructed with two reconstruction algorithms: standard filtered back-projection (FBP) and iterative model reconstruction (IMR). In total, 736 CTPA datasets were evaluated by three blinded radiologists regarding image quality, diagnostic confidence, and detectability of PE. Furthermore, contrast-to-noise ratio (CNR) was calculated. Results Images reconstructed with IMR showed better detectability of PE than images reconstructed with FBP, especially at lower dose levels. With IMR, sensitivity was over 95% for central and segmental PE down to a dose level of 25%. Significantly higher subjective image quality was shown at lower dose levels (25% and 12.5%) for IMR images whereas it was higher for FBP images at higher dose levels. FBP was rated as showing less artificial image appearance. CNR was significantly higher with IMR at all dose levels. Conclusion By using IMR, a dose reduction of up to 50% while maintaining satisfactory image quality seems feasible in standard clinical situations, resulting in a mean effective dose of 1.38 mSv for CTPA.

scholarly journals Influence of model based iterative reconstruction algorithm on image quality of multiplanar reformations in reduced dose chest CT

2016 ◽  
Vol 5 (8) ◽  
pp. 205846011666229 ◽  
Author(s):  
Heloise Barras ◽  
Vincent Dunet ◽  
Anne-Lise Hachulla ◽  
Jochen Grimm ◽  
Catherine Beigelman-Aubry
Keyword(s):  
Image Quality ◽  
Iterative Reconstruction ◽  
Reconstruction Algorithm ◽  
Chest Ct ◽  
Iterative Reconstruction Algorithm ◽  
Reduced Dose ◽  
Model Based ◽  
Multiplanar Reformations
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