Nuclear Cardiology Pierre-Yves MARIE Department of Nuclear Medicine CHU-Nancy, FRANCE.
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1 Nuclear Cardiology Pierre-Yves MARIE Department of Nuclear Medicine CHU-Nancy, FRANCE.
2 Nuclear Cardiology I - A remaining need of a functional information on myocardial perfusion II - The future: - combining functional and anatomic information, - new cameras and new images...
3 Nuclear Cardiology I - A remaining need of a functional information on myocardial perfusion II - The future: - combining functional and anatomic information, - new cameras and new images...
4 I - A remaining need of a functional information on myocardial perfusion Anatomical information: is not always enough for detecting and assessing CAD, coronary atherosclerosis remains frequently: - without ischemia, - uncomplicated. Coronary angiography Multidetector CT
5 Autopsy studies have determined the rates of high grade coronary atherosclerosis in patients : (i) who were without any history of CAD (ii) who died because of a non-cardiac cause. What is this rate in northamerican non-diabetic men of 65 years old? 1. less than 40% 2. from 40 to 60% 3. more than 60% Coronary angiography Multidetector CT
6 Coronary atherosclerosis in diabetes mellitus A population-based autopsy study. Tauqir Y. Goraya et al. J Am Coll Cardiol. 2002;40(5): Prevalence of high-grade coronary atherosclerosis at autopsy by diabetes and clinical coronary disease status. No CAD history! CAD history! D-! D+! D-! D+! D-! D+! D-! D+!
7 I - A remaining need of a functional information on myocardial perfusion Severe coronary stenoses are not always associated with severe perfusion abnormalities Mechanisms: - collaterals, - antianginal medications. Short-axis apical median basal Exercise 99m Tc-sestamibi Patient with a total occlusion of the right coronary artery, but with a normal exercise-spect under beta-blockers Long-axis horizontal vertical
8 The most serious coronary stenoses are those associated with perfusion abnormalities! 5-year rate of major cardiac events (death or MI) as a function of the stress- 201 Tl and angiographic results 40% Doat M., JACC, 1994 Short-axis apical Exercise 99m Tc-sestamibi 30% median 20% basal 10% Long-axis horizontal 0% No stenosis Normal 201 Tl (n=101) Stenosis Normal 201 Tl (n=52) Stenosis Abnormal 201 Tl (n=105) vertical
9 Prognostic stratification using exercise MPI Main parameters: ü Exercise testing parameters (maximal work load and heart rate, positive test) ü Normal stress-spect ü Extent of stress defects ü Extent of reversible stress defects Short-axis apical median basal Perfusion Exercise Rest Long-axis horizontal vertical
10 Prognostic stratification using exercise MPI Main parameters: ü Exercise testing parameters (maximal work load and heart rate, positive test) ü Normal stress-spect ü Extent of stress defects ü Extent of reversible stress defects ü Post-stress LV ejection fraction (<45%) and end-systolic volume (>70 ml) ü Reversible wall motion abnormalities Short-axis apical median basal Long-axis horizontal vertical Perfusion Exercise Rest Function Exercise Rest
11 Myocardial Perfusion Tomoscintigraphy I - A remaining need of a functional information on myocardial perfusion II - The future: - combining functional and anatomic information, - new cameras and new images...
12 Combining functional and anatomic information Hybrid SPECT/CT scanners Attenuation correction
13 Combining functional and anatomic information Hybrid SPECT/CT scanners for coronary calcium scoring Thompson RC, and Coll. Clinical utility of coronary calcium scoring after nonischemic myocardial perfusion imaging. J Nucl Cardiol. 2005;12: Shaw LJ, Berman DS. Redefining the low-risk patient with significant atherosclerotic disease. J Nucl Cardiol. 2005;12: In case of normal MPI, CT measurements of coronary calcium might allow subclinical atherosclerosis to be detected Such patients might: (i) have a worse prognosis (hard events:2% /y) and (ii) benefit of a more aggressive medical management.
14 Combining functional and anatomic information Hybrid SPECT/CT scanners for CT coronary angiography Gaemperli O, Eur Heart J, 2006
15 Gamma-cameras with semiconductors Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate - much higher energy resolu:on - higher spa:al resolu:on - smaller size GE Medical Systems Spectrum Dynamics 15
16 Gamma-cameras with semiconductors Camera head = 9 rotating detectors with - large tungsten collimators, - pixelized CZT detectors (2.5 mm). Spectrum Dynamics 16
17 Gamma-cameras with semiconductors Camera head = 9 rotating detectors with - large tungsten collimators, - pixelized CZT detectors (2.5 mm). Region-centric acquisition maximizing the recording time in the heart area Spectrum Dynamics 17
18 Gamma-cameras with semiconductors Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate Allows shortening acquisition time, up to: - 2 min for high injected 99m Tc activities, - 3 to 4 min for low injected 99m Tc activities and 201 Tl. Herzog BA et al. J Nucl Med. 2010;51: Semi- conductors Stress 2 min Rest 4 min Conven:onal Stress 11.5 min inferior wall & apical ischemia Rest 14 min
19 Gamma-cameras with semiconductors Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate ( centric acquisition) Might also allow: - reducing injected activities, up to. 100 MBq for 99m Tc tracers,. 50 to 75 MBq for 201 Tl. Clinical validation studies in progress
20 Gamma-cameras with semiconductors Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate ( centric acquisition) Might also allow: - reducing injected activities, up to Clinical validation. 100 MBq for 99m Tc tracers, studies in progress. 50 to 75 MBq for 201 Tl. - or maximizing spatial and/or temporal resolutions Sestamibi (400 MBq) 4 min recording :me 16 frames / cycle Voxels of 30 mm 3
21 Enregistrement Gamma-cameras d une TSM with par semiconductors la caméra D.SPECT Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate, - much higher energy resolubon Dual energy recording ü 3-7 mci of 99m Tc tracer and mci of 201 Tl, ü limited irradiation exposure (10-15 msv) ü only 1 positioning scan ü scatter correction (20-30% 99m Tc scatter in 201 Tl peak) 99m Tc tracer or 201 Tl 99m Tc tracer or 201 Tl Stress (6 to 20 min) Camera recording (12-15 min)
22 Enregistrement Gamma-cameras d une TSM with par semiconductors la caméra D.SPECT Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate, - much higher energy resolubon Stress Sestamibi Rest Tl- 201 Dual energy recording ü 3-7 mci of 99m Tc tracer and mci of 201 Tl, ü limited irradiation exposure (10-15 msv) ü only 1 positioning scan ü scatter correction (20-30% 99m Tc scatter in 201 Tl peak) 99m Tc tracer or 201 Tl 99m Tc tracer or 201 Tl Stress (6 to 20 min) Camera recording (12-15 min) Inferior MI
23 Simultaneous rest-tl/stress-tc recording with CZT Stress-Tc Yes, this is definitly a reversible defect! Stress-Tc Rest-Tl Rest-Tl Stress-Tc Rest-Tl Stress-Tc Rest-Tl 23
24 Enregistrement Gamma-cameras d une TSM with par semiconductors la caméra D.SPECT Cadmium zinc telluride (CZT) solid- state detectors - much higher myocardial count rate, - much higher energy resolubon Dual energy recording with other tracers: Exemple of dual 201 Tl/ 123 I-MIBG in severe diabetes 201 Tl 123 I 201 Tl 123 I
25 Étude de la viabilité myocardique avec le 18 F-FDG Encore considérée comme la référence, en particulier : - pour la détection du myocarde hibernant, - en cas de dysfonction VG sévère. Mismatch Match
26 Necrotic areas exhibit a dramatic decrease in metabolic activity decrease in FDG uptake Sirius red Collagen fibrosis LV 2-months after coronary occlusion in rats Maskali F. J Nucl Cardiol 2005 RV Central Border necrosis zone Remote myocardium Injection before sacrifice of Ø 111 In-DTPA Ø 99m Tc-Sestamibi Ø 18 F-FDG 18 F-FDG µ-imager!
27 Necrotic areas exhibit a dramatic decrease in myocardial perfusion (decrease in Sestamibi uptake) Sirius red Collagen fibrosis LV 2-months after coronary occlusion in rats Maskali F. J Nucl Cardiol 2005 RV Central Border necrosis zone Remote myocardium Injection before sacrifice of Ø 111 In-DTPA Ø 99m Tc-Sestamibi Ø 18 F-FDG 99m Tc-Sestamibi µ-imager!
28 Étude de la viabilité myocardique avec le 18 F-FDG Amélioration de la qualité d images : - nouvelles caméras TEP - prémédication par acide nicotinique ( AG circulants), p=0.02 PET+ FDG-TEP +Acipimox Homme avec IDM apical
29 Étude de la viabilité myocardique avec le 18 F-FDG Amélioration de la qualité d images : - nouvelles caméras TEP - prémédication par acide nicotinique ( AG circulants), p=0.02 PET+ FDG-TEP +Acipimox Homme avec IDM apical
30 Étude de la viabilité myocardique avec le 18 F-FDG Amélioration de la qualité d images : - nouvelles caméras TEP - prémédication par acide nicotinique ( AG circulants), p=0.02 PET+ Prémédication par acide nicotinique (Acipimox) chez le rat. Poussier S. Eur J Nucl Med 2010
31 New PET tracers for myocardial perfusion imaging Nekolla SG, and coll. Evaluation of the Novel Myocardial Perfusion PET Tracer 18 F-BMS Comparison to 13 N-Ammonia and Validation With Microspheres in a Pig Model. Circulation 2009;119: New cationic lipophylic tracers, labeled with 18 F: - high rates of myocardial extraction (>90%) and retention - better «flow tracer» than current SPECT and PET tracers, - very high image quality,
32 Molecular Imaging Remodeling New tracers developed for cardiologic and oncologic indications Imaging of matrix metalloproteinase (MMP) activity in a mouse heart infarct. Sinusas A. Yale University School of Medicine
33 Molecular Imaging Remodeling New tracers developed for cardiologic and oncologic indications Angiogenesis Imaging of αvβ3 integrin expression using 18 F-galacto-RGD in a rat heart infarct - for characterisation of angiogenesis in vivo - for monitoring therapeutic effects. Higuchi T, et al. Eur J Nucl Med Mol Imaging. 2007;34:S9-19.
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