Optimized acquisition time and image sampling for dynamic SPECT of Tl-201

With the recent development in scatter and attenuation correction algorithms, dynamic single photon emission computerized tomography (SPECT) cain potentially yield physiological parameters, with tracers exhibiting suitable kinetics such as thallium-201 (T1-201). a systematic way is proposed to investigate the minimum data acquisition times and sam;ling requirements for estimating physiological parameters with quantitative dynamic SPECT. Two different sampling schemes were investigated with Monte Carlo simulations: 1) continuous data collection for total study duration ranging from 30-240 min, 2) Continuous data collection for first 10-45 min followed by a delayed study at approximately 3 h, Tissue time activity curves with realistic noise were generated from a mean plasma time activity curve and rate constants (K-1 - k(4)) derived from T1-201 kinetic studies ire 16 dogs, Full dynamic sampling schedules DynSS) were compared to optimum sampling schedules (OSS). We found that OSS can reliably estimate the blood Wow related K-1 and V-d comparable to DynSS. A 30-min continuous collection was sufficient if only K-1 was of interest, A split session schedule of a 30-min dynamic followed by a static study at 3 h allowed reliable estimation of both K-1 and V-d avoiding the need for a prolonged (>60-min) continuous dynamic acquisition, The methodology developed should also be applicable to optimizing sampling schedules for ether SPECT tracers,