Cardiac PET. John Buscombe
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1 Cardiac PET John Buscombe
2 Why PET? Improved resolution-not really required in cardiology Improved sensitivity this may be important-financially as reduced acquisition time Improved attenuation correction-good Look at metabolism-could be very good
3 PET-CT New technology Combines functional information-pet anatomical information-ct Machine able to perform both studies in single imaging episode PET imaging depends on positron decay
4 PET Positron Emission Tomography Positrons positively charged electrons Travel mm hit electron Annihilate e=mc 2 2 x 511 kev gammas produced travel at 180 degrees Detected by a ring of detectors Many used in cancer imaging
5 Positron annihilation
6 PET detection
7 PET-CT scanner
8 Inside a PET-CT scanner
9 Time of flight Normally PET uses co-incidence event PET systems can only determine the line along which event occurred If resolution fast enough (eg <600ps) can detect different times that the 511keV arrives at detector so can determine site of origin Seems to be of particular use in more obese patients Also can reduce activity required eg from MBq F-18 FDG
10 Time of Flight Normal single event recorded Time of flight both events recorded
11 High quality image in obese patient
12 F-18 FDG Most commonly available PET radiopharamceutical Uptake dependent on glucose drive in cells Related to hypoxia Glucose to lactate (no O 2 ) = 4ATP per molecule Glucose to Krebs cycle =32 ATP per molecule So ischaemic tissue needs lots of glucose but remember in diabetics competitive uptake so need blood glucose <6mmol/l
13 Viability In patients with severe ischaemia identification of viable heart very important Revascularisation may result in improvement in flow and over time return of function Prognosis dependent on LVEF in these patients is viable myocardium not improved 32% 1 year survival vs 7% if improved (Dy Carli et al JTCS 1998) F-18 FDG can find that viability
14 Perfusion and viability Viability found with F-18 FDG (where uptake may be increased in severe ischaemia) How about perfusion N-13 H 3 Rb-82 However though not perfect can use single photon for perfusion
15 SPET and PET
16 FDG in action Wu et al Kyoto JNM 2007 Looked at 41 patients with severe IHD Using Tl-201/FDG PET mismatches identified (heart divided into 17 segments) 394 viabible segments per heart were identified in 31 patients 29 had CABG, 76% of these had an improvement of >5% in LVEF
17 FDG in viability Slart et al Groningen JNC segments in 31 patients (17 segments per patient) were imaged with F-18 FDG before and just after CABG An increase in F-18 FDG uptake of more than 50% post surgery predicted improvement in LVEF in 93% of cases (specificity 85%)
18 Comparing NH 3 and F-18 FDG Slart et al Groningen EJNMMI 2006 Used combination of NH3 and F-18 FDG PET to determine areas of viability (reduced NH 3 with normal or raised F-18 FDG) or normal NH 3 but raised F-18 FDG) 47 patients with severe IHD In 90% of these PET predicted an improved LVEF post surgery
19 What can we see What follows is a series of perfusion maps of perfusion and viability Available on line from Bringham and Womens s hospital in Boston Only illustrative examples
20 Normal
21 Infarct
22 Viability
23 Hibernation
24 Cardiomyopathy
25 In reality what it looks like
26 Improving the system Can we use PET to provide a better service Rb-82 may allow for faster more accurat imaging Possibly all can be performed in a (one stop shop) Especially with 64 or 128 slice CT
27 Rb-82 for perfusion Bateman et al Kansas JNC patients had Tc-99m MIBI and Rb-82 perfusion studies 4 blinded readers compared results with CABG (stenosis of 70%) Rb-82 had accuracy of 89% compared with 79% for SPECT (p=0.003) Rb-82 better in men and the obese
28 J Machac NYU SPECT vs Rb-82 PET
29 AC vs PET
30 Proposed scheme for viability AC CT AC-CT AC-CT CT angiogram Rb-82 injection and scan F-18 FDG injection FDG scan adenosine stress mins 18mSv without CT angiogram 42mSv with CT angiogram
31 What else can we do with PET Look at fatty acid uptake which may be the first change to occur with ischaemia C-11 acetate Look at deposition of Ca in placques more specific to ongoing process than CT Na-F-18 CAFÉ project Look at hypoxia directly with F-18 FMISO or Cu-64 ATSM
32 C-11 acetate in the heart
33 PET and CT Wagner et al Munich JACC 2007 Used a combination of PET and CT to look at structure and function in the treatment of ischaemia by transgenic infection with adenovirus Able to use combination to determine both cardiac anatomy and function and result of genetic treatment
34 Able to show reporter gene function and perfusion with PET
35 Peripheral CVS Atherosclerosis can occur in most major vessels Can be linked to embolism and thrombosis Known linkage to chol New evidence inflammed atheroma most unstable Can be treated with statins
36 Figuerola et al Circ Imaging 2011
37 Arterial FDG Signal Is Reproducible Day 1 Day 14 Rudd JHF et al JACC 2007 Rudd JHF et al JNM 2008
38 Response To Therapy: Simvastatin Treatment Study Tahara et al JACC 2006
39 In conclusion PET imaging is able to identify viability Probably best combination is Rb-82 (or N-13 NH 3 ) and F-18 FDG PET Can be used to predict response to surgery How does PET results compare with MR? New role of PET in peripheral CV disease
Cardiac NM. John Buscombe
Cardiac NM John Buscombe Nuclear Cardiology RNV Tc-99m labelled RBCs MPS Tl-201 Tc-99m MIBI Tc-99m tetrofosmin Rb-82 Others I-123 MIBG C-11 fatty acids Tc-99m HL91 F-18 FDG Is there any money in it In
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