PMID- 7957344
OWN - NLM
STAT- MEDLINE
DCOM- 19941209
LR  - 20190825
IS  - 0340-6997 (Print)
IS  - 0340-6997 (Linking)
VI  - 21
IP  - 7
DP  - 1994 Jul
TI  - An evaluation of the accelerated expectation maximization algorithms for 
      single-photon emission tomography image reconstruction.
PG  - 597-603
AB  - We previously reported that brain single-photon emission tomography (SPET) images 
      could be improved by using an attenuation coefficient map constructed with 
      transmission data and the iterative expectation maximization (EM) algorithm. 
      However, the conventional EM algorithm (CEM) typically requires 30-80 iterations 
      to provide acceptable results, limiting its clinical applicability. Several 
      methods have been proposed to accelerate the EM algorithm. The purpose of this 
      study was to search for a practical method for accelerating the EM algorithm. The 
      methods investigated here include the accelerated EM algorithm (ACEM) using 
      additive correction, ACEM using multiplicative correction, and Tanaka's filtered 
      iterative reconstruction method (FIR). These methods were assessed by simulated 
      SPET studies of a phantom incorporating nonuniform attenuation and by reference 
      to clinical brain SPET data. In the simulation studies, the above methods were 
      evaluated by using three parameters (root mean square error, log likelihood 
      value, and contrast recovery coefficient); the results showed that FIR had an 
      advantage over other methods in terms of all parameters. The results obtained 
      using the clinical data demonstrated that FIR could reconstruct acceptable images 
      in only five iterations. These results show that FIR offers significant 
      advantages over CEM or other ACEMs, indicating that FIR can make the EM algorithm 
      practical for clinical use in SPET.
FAU - Murase, K
AU  - Murase K
AD  - Department of Radiology, Ehime University School of Medicine, Japan.
FAU - Tanada, S
AU  - Tanada S
FAU - Sugawara, Y
AU  - Sugawara Y
FAU - Tauxe, W N
AU  - Tauxe WN
FAU - Hamamoto, K
AU  - Hamamoto K
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PL  - Germany
TA  - Eur J Nucl Med
JT  - European journal of nuclear medicine
JID - 7606882
SB  - IM
CIN - Eur J Nucl Med. 1994 Jul;21(7):595-6. PMID: 7957343
MH  - Adult
MH  - *Algorithms
MH  - Brain/*diagnostic imaging
MH  - Computer Simulation
MH  - Evaluation Studies as Topic
MH  - Humans
MH  - *Image Processing, Computer-Assisted
MH  - Male
MH  - Models, Structural
MH  - Tomography, Emission-Computed, Single-Photon/*methods
EDAT- 1994/07/01 00:00
MHDA- 1994/07/01 00:01
CRDT- 1994/07/01 00:00
PHST- 1994/07/01 00:00 [pubmed]
PHST- 1994/07/01 00:01 [medline]
PHST- 1994/07/01 00:00 [entrez]
AID - 10.1007/BF00285580 [doi]
PST - ppublish
SO  - Eur J Nucl Med. 1994 Jul;21(7):597-603. doi: 10.1007/BF00285580.