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Characteristics of various SPECT myocardial perfusion agents

Characteristics of various SPECT myocardial perfusion agents
  Thallium Sestamibi Tetrofosmin
Class Element Isonitrite Diphospine
Charge Positive Positive Positive
Lipophilic No No No
Extraction Mod-high Moderate Moderate
Retention Moderate High High
Redistribution Yes Minimal Minimum
Start time* <15 min 15-60 min 15-30 min
Imaging protocol 1 day 1 or 2 days 1 or 2 days
Gated SPECT Possible Yes Yes
First pass No Yes Yes
Viability assessment Yes Yes Yes?
* Start time is the time from injection of tracer to the start of imaging after stress.
Adapted from: Stewart RE, Schwaiger M, Hutchins GD, et al, J Nucl Med 1990; 31:1183.
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