Optimization of reconstruction parameters for SPECT and SPECT/CT

Czech version

Authors: Pavel Karhan; Jaroslav Ptáček; Petr Fiala
Authors‘ workplace: Oddělení lékařské fyziky a radiační ochrany, FN Olomouc a LF Univerzity Palackého
Published in: NuklMed 2015;4:66-72
Category: Original Article

Overview

Purpose:
This work presents results of an optimization of reconstruction parameters, namely number of iterations and number of subsets in OSEM algorithm.

Materials and methods:
The optimization was based on contrast and signal to noise ratio measurements on NEMA Body Phantom tomographic reconstructions. Four sets of SPECT projections data were acquired using two different activities at two cameras. Over 500 recontructions using various corrections and resolution recovery algorithm (RR) were realized to scan the parametric space to find the optimal configuration.

Results and conclusion:
In the contex of computation time and software instability the best combinations were found as 4 iterations and 10 subsets without using RR and 5 iterations and 10 subsets with RR in matrix 128 x 128, 3 iterations and 12 subsets without RR and 4 iterations and 12 subset with RR in matrix 256 x 256.

Key Words:
SPECT, optimization, tomographic reconstruction, image quality

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Labels

Nuclear medicine Radiodiagnostics Radiotherapy

Extraneural dissemination of cerebellar medulloblastoma detected by 18F-FDG PET/CT – a case report of a rare situation

Article was published in

Nuclear Medicine

2015 Issue 4