Validation of an iterative reconstruction for a mobile tomographic gamma camera system-The Cardiotom

I. Valastyán, D. Bone, L. Å Brodin, H. Elmqvist, J. Lagerlöf, A. Kerek, J. Molnár, D. Novák

Research output: Contribution to journalArticle

2 Citations (Scopus)


The Cardiotom is a mobile gamma camera that uses ectomography, an alternative method of acquisition to SPECT. It is designed for early diagnosis of myocardial and cerebral infarctions in the emergency room. Ectomography is a limited view angle method, using a rotating slant hole collimator and a stationary camera head, to acquire projection images. The aim of this work was to validate a fully 3D ML-EM iterative reconstruction algorithm for the Cardiotom. Validation measurements were performed with 99mTc point sources. Resolution in the reconstructed volume was determined in X, Y, and Z directions from the point spread functions. The results were compared with the values for the formerly used filtered back projection (FBP). The new reconstruction algorithm provides greatly improved depth resolution with respect to the FBP method previously implemented on the Cardiotom. Furthermore, for clinical examinations, images can be available for interpretation within 15 min of the injection, therefore, valuable information can be obtained without delaying treatment of the patient.

Original languageEnglish
Pages (from-to)1097-1100
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2
Publication statusPublished - Oct 1 2007



  • Gamma camera
  • Image reconstruction
  • Medical imaging

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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