Dynamic CT perfusion imaging of the myocardium: a technical note on improvement of image quality
To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myoca...
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Published in | PloS one Vol. 8; no. 10; p. e75263 |
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Main Authors | , , , , , , , , , , |
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09.10.2013
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Abstract | To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.
Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myocardial perfusion defects-were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps.
The use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv.
The use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. |
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AbstractList | Objective
To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.
Methods
Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients–with and without myocardial perfusion defects–were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps.
Results
The use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv.
Conclusion
The use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. Objective To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. Methods Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myocardial perfusion defects-were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps. Results The use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv. Conclusion The use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. OBJECTIVETo improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. METHODSDynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myocardial perfusion defects-were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps. RESULTSThe use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv. CONCLUSIONThe use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myocardial perfusion defects-were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps. The use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv. The use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. Dynamic CT MPI was performed using a 256-slice multidetector computed tomography scanner (MDCT). Data from two different patients-with and without myocardial perfusion defects-were evaluated to illustrate potential improvements for MPI (institutional review board approved). Three datasets for each patient were generated: (i) original data (ii) motion compensated data and (iii) motion compensated data with spatio-temporal filtering performed. In addition to the visual assessment of the tomographic slices, noise and contrast-to-noise-ratio (CNR) were measured for all data. Perfusion analysis was performed using time-density curves with regions-of-interest (ROI) placed in normal and hypoperfused myocardium. Precision in definition of normal and hypoperfused areas was determined in corresponding coloured perfusion maps. The use of motion compensation followed by spatio-temporal filtering resulted in better alignment of the cardiac volumes over time leading to a more consistent perfusion quantification and improved detection of the extend of perfusion defects. Additionally image noise was reduced by 78.5%, with CNR improvements by a factor of 4.7. The average effective radiation dose estimate was 7.1±1.1 mSv. The use of motion compensation and spatio-temporal smoothing will result in improved quantification of dynamic CT MPI using a latest generation CT scanner. |
Audience | Academic |
Author | Schmitt, Holger Kabus, Sven Rummeny, Ernst J Muenzel, Daniela Wildgruber, Moritz Leber, Vivian Vembar, Mani Gramer, Bettina Fingerle, Alexander A Noël, Peter B Huber, Armin |
AuthorAffiliation | 3 Philips Healthcare, CT Clinical Science, Cleveland, Ohio, United States of America The University of Chicago, United States of America 1 Department of Radiology, Klinikum rechts der Isar, Technische Universitaet Muenchen, Munich, Germany 2 Philips Research Laboratories, Digital Imaging Department, Hamburg, Germany |
AuthorAffiliation_xml | – name: The University of Chicago, United States of America – name: 2 Philips Research Laboratories, Digital Imaging Department, Hamburg, Germany – name: 3 Philips Healthcare, CT Clinical Science, Cleveland, Ohio, United States of America – name: 1 Department of Radiology, Klinikum rechts der Isar, Technische Universitaet Muenchen, Munich, Germany |
Author_xml | – sequence: 1 givenname: Daniela surname: Muenzel fullname: Muenzel, Daniela organization: Department of Radiology, Klinikum rechts der Isar, Technische Universitaet Muenchen, Munich, Germany – sequence: 2 givenname: Sven surname: Kabus fullname: Kabus, Sven – sequence: 3 givenname: Bettina surname: Gramer fullname: Gramer, Bettina – sequence: 4 givenname: Vivian surname: Leber fullname: Leber, Vivian – sequence: 5 givenname: Mani surname: Vembar fullname: Vembar, Mani – sequence: 6 givenname: Holger surname: Schmitt fullname: Schmitt, Holger – sequence: 7 givenname: Moritz surname: Wildgruber fullname: Wildgruber, Moritz – sequence: 8 givenname: Alexander A surname: Fingerle fullname: Fingerle, Alexander A – sequence: 9 givenname: Ernst J surname: Rummeny fullname: Rummeny, Ernst J – sequence: 10 givenname: Armin surname: Huber fullname: Huber, Armin – sequence: 11 givenname: Peter B surname: Noël fullname: Noël, Peter B |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/24130697$$D View this record in MEDLINE/PubMed |
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Copyright | COPYRIGHT 2013 Public Library of Science 2013 Muenzel et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 2013 Muenzel et al 2013 Muenzel et al |
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Notes | ObjectType-Case Study-2 SourceType-Scholarly Journals-1 ObjectType-Feature-4 content type line 23 ObjectType-Report-1 ObjectType-Article-3 Conceived and designed the experiments: DM SK PBN EJR AH. Performed the experiments: DM BG VL AH PBN. Analyzed the data: DM MW AAF PBN. Contributed reagents/materials/analysis tools: DM SK MV HS PBN. Wrote the paper: DM SK HS MV PBN. Competing Interests: The authors have declared the following interests: SK and HS are employees of Philips Technologie GmbH; MV is employee of Philips Healthcare. There are no patents, products in development or marketed products to declare. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials, as detailed online in the guide for authors. |
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Snippet | To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.
Dynamic CT... Objective To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.... To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter. Dynamic CT... OBJECTIVETo improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.... OBJECTIVE: To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.... Objective To improve image and diagnostic quality in dynamic CT myocardial perfusion imaging (MPI) by using motion compensation and a spatio-temporal filter.... |
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SubjectTerms | Aged, 80 and over Atherosclerosis Cardiovascular disease CAT scans Compensation Computed tomography Coronary vessels Data processing Defects Diagnostic equipment (Medical) Diagnostic imaging Diagnostic systems Digital imaging Electrocardiography Filtration Heart - diagnostic imaging Heart diseases Hemodynamics Humans Image detection Image quality Laboratories Male Medical imaging Middle Aged Motion compensation Myocardial Perfusion Imaging - methods Myocardium Myocardium - pathology NMR Noise Nuclear magnetic resonance Patients Perfusion Radiation Radiation dosage Registration Scanners Tomography Tomography, X-Ray Computed - methods |
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Title | Dynamic CT perfusion imaging of the myocardium: a technical note on improvement of image quality |
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