Dual Energy CT of Pulmonary Embolism
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1 Dual Energy CT of Pulmonary Embolism U. Joseph Schoepf, MD, FAHA, FSCBT MR, FSCCT Professor of Radiology, Medicine, and Pediatrics Director of Cardiovascular Imaging
2 Disclosures Consultant for / research support from: Bayer Bracco General Electric Medrad Siemens
3 Collaborators Thomas Henzler, MD Paul Apfaltrer, MD Christian Fink, MD Department of Clinical Radiology and Nuclear Medicine University Medical Center Mannheim, Medical Faculty Mannheim Heidelberg University Germany
4 Why Are We Interested in CT Lung Perfusion? If large % of lung parenchyma is affected by embolic occlusion, imminent right heart failure warrants a more aggressive regimen such as thrombolysis or embolectomy that carries a small but definite risk. Pulmonary embolism thrombolysis: broadening the paradigm for its administration. Goldhaber SZ; Circulation Quantitative assessment of the affected lung parenchyma may bear more important information for patient management than the direct visualization of emboli alone. Association between thrombolytic treatment and the prognosis of hemodynamically stable patients with major pulmonary embolism: results of a multicenter registry. Konstantinides S; Circulation 1997
5 Techniques for CT Lung Perfusion Static Dynamic Unenhanced CT attenuation analysis Color coded perfusion maps Non contrast / contrast subtraction CT Electron beam CT Dynamic spiral CT Dynamic volume CT Dual Energy CT
6 Screaton et al. JTI 2003 Dynamic Spiral CT Lung Perfusion
7 EBCT Dynamic Lung Perfusion in Acute PE Schoepf et al. Radiology 2001
8 EBCT Dynamic Lung Perfusion in Acute PE Schoepf et al. Radiology 2001
9 EBCT Dynamic Lung Perfusion in Acute PE Schoepf et al. Radiology 2001
10 Color Coded Perfusion Maps in Acute PE Perfusion Ventilation Herzog, Wildberger, Schoepf et al. Acad Radiol 2003
11 Broad Detector vs. Dynamic Shuttle CT
12 320 Slice CT Lung Perfusion Imaging in PE Pre treatment Post treatment Right lung almost restored; large defect remains in left lung Courtesy: Edwin J.R. van Beek, CRIC, University of Edinburgh, UK
13 Shuttle Mode Dynamic CT Perfusion Imaging
14 Shuttle Mode Dynamic CT Perfusion Imaging
15 140kV 80 / 100kV Integrative Cardiopulmonary Imaging: Dual Energy CT
16 DECT Imaging in Acute PE?????
17 DECT Imaging in Acute PE
18 DECT Lung Perfusion in Acute PE
19 DECT Lung Perfusion in Acute PE
20 DECT Lung Perfusion in Acute PE Henzler et al. JCCT 2011
21
22 Foreign Body Embolization Henzler, J Cardiovasc Med 2010
23 DECT Lung Perfusion in Acute PE: Pitfalls
24 DECT Post Processing 80kV Bone 670 HU Iodine 296 HU Bone 450 HU Iodine 144 HU 140kV
25 DECT Lung Perfusion in Acute PE: Pitfalls
26 Contrast Media Injection Strategies Group Iodine concentration (mg/ml) Total volume Injection rate (ml/s) Iodine delivery rate (gi/s) Injection time (s) Total iodine load (g) A B C D Nance et al. Invest Radiol 2011
27 Contrast Media Injection Strategies Beam Hardening Artifacts A B C D High IDR in combination with highly concentrated CM reduces artifacts for DECT Nance et al. Invest Radiol 2011
28 Static or Dynamic? DECT vs. TWIST MRA
29 Static or Dynamic? Hansmann J et al. RSNA 2011
30 DECT Lung Perfusion in Acute PE: Prognosis R. Bauer et al., Eur Radiol 2011
31 DECT CPHT
32 DECT COPD
33 DECT Lung Nodule Characterization Chae et al. Radiology 2008
34 DECT Lung Cancer Staging
35 DECT Lung Cancer Characterization
36 DECT Lung Cancer Characterization Fink et al. Onkologie 2009
37 DECT Lung Cancer Imaging: Therapy Response 05/ / / /2010
38 Summary Increase Diagnostic Accuracy Why CT Perfusion in PE? Assessment of RVD Therapy Monitoring EBCT Feasibility Studies Single Level Dynamic Spiral CT Perfusion Weighted Color Maps CT CE Non CE Subtraction CT State of the art Dynamic Volume CT Dual Energy CT
39 Summary DECT maybe the most practical approach to establish comprehensive imaging Easy to integrate in clinical workflow No additional dose, CM and room time No additional costs Prospective multicenter studies on: Impact on treatment decisions Usefulness for therapy monitoring Patient outcome
40
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