TL-201-MYOCARDIAL SPECT - FIRST EXPERIENC ES WITH A SIMULTANEOUS TRANSMISSION EMISSION ACQUISITION FOR NON-UNIFORM PATIENT-RELATED ATTENUATION CORRECTION

Aim: In this study our first clinical experiences with simultaneous tr ansmission and emission acquisition in Tl-201 myocardial SPECT (T/E-SP ECT) are discussed. Methods: The non-uniform attenuation (AK) was carr ied our with a triple-head camera (PRISM 3000, Picker Inc.) correction equipped with fanbeam collimators. A line source of 750 MBq Tc-99m wa s used to construct the transmission profile. Prior to investigation p atients got 80-120 MBq Tl-201-chloride intraveneously injected. Result s: The study comprises the evaluation of 40 patients, derived from the clinical routine. The investigation followed an usual one day protoco l. Our results using T/E-SPECT reveal an almost equilibrated activity distribution between anterior and posterior myocardial wall. Conclusio n: For this reason it is to be expected that T/E-SPECT provides more r eliable information about the posterior myocardial wall, than the usua l SPECT technique without attenuation correction.