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EJNMMI Research
Fig. 4 | EJNMMI Research

Fig. 4

From: Phase analysis single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) detects dyssynchrony in myocardial scar and increases specificity of MPI

Fig. 4

Comparative cases demonstrating use of phase analysis in instances of questionable resting defect (scar). A 74-year-old male with a history of hypertension, hyperglycemia and obstructive sleep apnea presented with 4 months of exertional dyspnea and palpitations was referred for radionuclide stress testing. Short-axis rest and stress images displaced from apex to base (a) demonstrated a possible resting perfusion defect in the lateral portion of the apex (red arrow). b A 76-year-old obese, hypertensive male presented with complaints of 3 months of exertional dyspnea underwent radionuclide stress testing which revealed a possible resting defect in the basal inferior segment (blue arrow). c Resting polar map and histogram of patient from case (a) demonstrating significant dyssynchrony, with an entropy 72%. Compare these findings with the polar map and histogram (d) of the second patient (b) which demonstrates synchrony with entropy 45%

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