Title :
Assessment of performance for the dynamic SPECT (dSPECT) method
Author :
Celler, A. ; Farncombe, Troy ; Noll, Dominikus ; Maeght, Jean ; Blinder, Stephan ; Harrop, R.
Author_Institution :
Div. of Nucl. Med., Vancouver Hospital & Health Sci. Centre, BC
Abstract :
The four-dimensional images reconstructed using the dSPECT method may be used to quantify temporal changes in regional radiotracer concentrations within a patient which are believed to reflect the functional ability of the investigated organ. The accuracy of the diagnosis will certainly depend on the accuracy of the dynamic reconstruction. Therefore, before the method can be used clinically it is important to evaluate its performance and limitations. The accuracy of the dSPECT reconstructions may be assessed using several different approaches and here the authors present a summary of their research in this area and discuss different validation techniques. Analysis of simulation data created using 6 different acquisition protocols with three camera configurations demonstrated that the errors in reconstructed dynamic activity distributions range from about 50% for single head cameras to just a few percent for triple head systems. The accuracy of kinetic parameter evaluation depends strongly on the modelled situation, but in general the shapes of the reconstructed time activity curves match closely the shapes of the true curves. Quantitative analysis of the data showed good agreement for washout half-lives in the range 3-8 minutes but larger errors were present for longer T1/2 and for multi exponential time-activity functions. These findings were confirmed in phantom experiments, although the results were more difficult to qualify in this case. Numerical values of the renal GFR measurements performed using blood sampling method, dynamic planar and dSPECT scans for normal volunteers are reported
Keywords :
image reconstruction; medical image processing; single photon emission computed tomography; 3 to 8 min; acquisition protocols; blood sampling method; camera configurations; dynamic SPECT method performance assessment; dynamic planar scans; kinetic parameter evaluation accuracy; medical diagnostic imaging; normal volunteers; nuclear medicine; reconstructed dynamic activity distributions errors; regional radiotracer concentrations; renal GFR measurements; single head cameras; temporal changes quantification; triple head systems; washout half-lives; Active shape model; Analytical models; Cameras; Data analysis; Dynamic range; Head; Image reconstruction; Imaging phantoms; Kinetic theory; Protocols;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2000 IEEE
Conference_Location :
Lyon
Print_ISBN :
0-7803-6503-8
DOI :
10.1109/NSSMIC.2000.949247