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Mattias Ohlsson

Mattias Ohlsson

Professor

Mattias Ohlsson

An independent evaluation of a new method for automated interpretation of lung scintigrams using artificial neural networks

Author

  • Holger Holst
  • Klas Måre
  • Andreas Järund
  • Karl Åström
  • Eva Evander
  • Kristina Tägil
  • Mattias Ohlsson
  • Lars Edenbrandt

Summary, in English

The purpose of this study was to evaluate a new automated method for the interpretation of lung perfusion scintigrams using patients from a hospital other than that where the method was developed, and then to compare the performance of the technique against that of experienced physicians. A total of 1,087 scintigrams from patients with suspected pulmonary embolism comprised the training group. The test group consisted of scintigrams from 140 patients collected in a hospital different to that from which the training group had been drawn. An artificial neural network was trained using 18 automatically obtained features from each set of perfusion scintigrams. The image processing techniques included alignment to templates, construction of quotient images based on the perfusion/template images, and finally calculation of features describing segmental perfusion defects in the quotient images. The templates represented lungs of normal size and shape without any pathological changes. The performance of the neural network was compared with that of three experienced physicians who read the same test scintigrams according to the modified PIOPED criteria using, in addition to perfusion images, ventilation images when available and chest radiographs for all patients. Performances were measured as area under the receiver operating characteristic curve. The performance of the neural network evaluated in the test group was 0.88 (95% confidence limits 0.81–0.94). The performance of the three experienced experts was in the range 0.87–0.93 when using the perfusion images, chest radiographs and ventilation images when available. Perfusion scintigrams can be interpreted regarding the diagnosis of pulmonary embolism by the use of an automated method also in a hospital other than that where it was developed. The performance of this method is similar to that of experienced physicians even though the physicians, in addition to perfusion images, also had access to ventilation images for most patients and chest radiographs for all patients. These results show the high potential for the method as a clinical decision support system.

Department/s

  • Clinical Physiology (Lund)
  • Mathematics (Faculty of Engineering)
  • Mathematical Imaging Group
  • Nuclear medicine, Malmö
  • Computational Biology and Biological Physics
  • Department of Astronomy and Theoretical Physics
  • Artificial Intelligence in CardioThoracic Sciences (AICTS)

Publishing year

2001-01

Language

English

Pages

33-38

Publication/Series

European Journal Of Nuclear Medicine

Volume

28

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Clinical Medicine
  • Medical Image Processing

Keywords

  • computer-assisted Diagnosis
  • Neural networks
  • Radionucleotide imaging
  • Pulmonary embolism
  • Image Processing (Computer-Assisted)

Status

Published

Research group

  • Mathematical Imaging Group
  • Nuclear medicine, Malmö
  • Artificial Intelligence in CardioThoracic Sciences (AICTS)

ISBN/ISSN/Other

  • ISSN: 0340-6997