41. |
|
|
42. |
- Kalra, Mannudeep, et al.
(författare)
-
Iterative Reconstruction Techniques: The Be-All and End-All for CT Dose Reduction? Pictorial Synopsis of Different Vendor Techniques
- 2010
-
Ingår i: In Proceedings of RSNA 2010, LL-PHE 4076.
-
Konferensbidrag (refereegranskat)abstract
- Recently introduced IRT for clinical use allow dose reduction for adult and pediatric CT while maintaining or even enhancing image quality compared to filtered back projection based reconstruction. Specific adjustments of scanning protocols and fine-tuning of iterative settings are necessary to ensure optimum usage with understanding of its potential and disadvantages. This educational exhibit focuses on clinical illustrations to simplify application of IRT for reducing CT radiation dose
|
|
43. |
|
|
44. |
|
|
45. |
|
|
46. |
- Lantz, Jonas, et al.
(författare)
-
Characterization of Cardiac Flow in Heart Disease Patients by CFD and 4D Flow MRI
- 2017
-
Ingår i: Bulletin of the Amerian Physcial Society. - : American Physical Society.
-
Konferensbidrag (refereegranskat)abstract
- In this study, cardiac blood flow was simulated using Computational Fluid Dynamics and compared to in vivo flow measurements by 4D Flow MRI. In total, nine patients with various heart diseases were studied. Geometry and heart wall motion for the simulations were obtained from clinical CT measurements, with 0.3x0.3x0.3 mm spatial resolution and 20 time frames covering one heartbeat. The CFD simulations included pulmonary veins, left atrium and ventricle, mitral and aortic valve, and ascending aorta. Mesh sizes were on the order of 6-16 million cells, depending on the size of the heart, in order to resolve both papillary muscles and trabeculae. The computed flow field agreed visually very well with 4D Flow MRI, with characteristic vortices and flow structures seen in both techniques. Regression analysis showed that peak flow rate as well as stroke volume had an excellent agreement for the two techniques. We demonstrated the feasibility, and more importantly, fidelity of cardiac flow simulations by comparing CFD results to in vivo measurements. Both qualitative and quantitative results agreed well with the 4D Flow MRI measurements. Also, the developed simulation methodology enables “what if” scenarios, such as optimization of valve replacement and other surgical procedures.
|
|
47. |
|
|
48. |
|
|
49. |
|
|
50. |
|
|