Infectious myocarditis are frequent, most of the time viral and can evolve to cardiac insufficiency. The diagnosis is difficult because they can mime an acute coronary syndrome. Approximately 10 % of patients with acute infarction suspected, have a normal angiography, and half of them has in fact a myocarditis, as showed studies of cardiac MRI among which some realized in our department . However, anomalies observed in MRI are not specific and it is necessary to use multiple criterions. A new radiopharmaceutical, the 68Ga-DOTATOC, specific of somatostatin's receptors which are over expressed by the inflammatory cells, has recently showed the capacity to identify myocarditis, but only in a small group of 6 patients.

The investigators make assumptions:

1. this radiopharmaceutical is enough sensitive to detect most of the acute inflammatory myocarditis which are identified by the MRI and
2. it could maybe allow to identify myocarditis with a persistent subacute or chronic inflammation, which are difficult to identify with cardiac MRI, and it would be a new information able to guide the medical decision.

Primary objectif: to determine if PET with 68Ga-DOTATOC is enough sensitive to identify myocarditis in acute inflammatory phase by hospitalized patients with suspected acute infarction and with normal angiography and who have a high probability of myocarditis identified by MRI. Disease prevalence will be close to 100 % at baseline Secondary objectives: 1. Estimate the frequency of inflammatory forms (subacute or chronicle), with a 68Ga-DOTATOC PET at 3 to 5 months from baseline, when classic signs of acute inflammatory generally disappeared (CRP, Troponin-I, myocardial oedema in MRI).

2. Analyze the concordance of the results of 68Ga-DOTATOC TEP by two readers

Inclusion Criteria:

• Adult subjects who have given their written consent to participate in the study.
• Patients without history of heart disease, hospitalized for acute infarction suspected with positive troponine, normal or subnormal angiography and which have a high probability of acute inflammatory myocardities on the secondarily realized MRI (= 2 criteria of Lake Louise)
• No contraindication to perform a 68Ga-DOTATOC-PET .
• Patient belong to a social security scheme.

Exclusion Criteria:

• Patients under guardianship or curatorship.
• Pregnancy, breastfeeding and woman of childbearing age without effective contraception
• Impossibility to perform a PET with 68Ga-DOTATOC (patient agitated).
• Impossibility to schedule PET/CT before the deadline = in 7 days since the beginning of the hospitalization.