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Mattias Ohlsson

Mattias Ohlsson

Professor

Mattias Ohlsson

Computer-Assisted Interpretation of Planar Whole-Body Bone Scans.

Author

  • May Sadik
  • Iman Hamadeh
  • Pierre Nordblom
  • Madis Suurkula
  • Peter Höglund
  • Mattias Ohlsson
  • Lars Edenbrandt

Summary, in English

The purpose of this study was to develop a computer-assisted diagnosis (CAD) system based on image-processing techniques and artificial neural networks for the interpretation of bone scans performed to determine the presence or absence of metastases. METHODS: A training group of 810 consecutive patients who had undergone bone scintigraphy due to suspected metastatic disease were included in the study. Whole-body images, anterior and posterior views, were obtained after an injection of (99m)Tc-methylene diphosphonate. The image-processing techniques included algorithms for automatic segmentation of the skeleton and automatic detection and feature extraction of hot spots. Two sets of artificial neural networks were used to classify the images, 1 classifying each hot spot separately and the other classifying the whole bone scan. A test group of 59 patients with breast or prostate cancer was used to evaluate the CAD system. The patients in the test group were selected to reflect the spectrum of pathology found in everyday clinical work. As the gold standard for the test group, we used the final clinical assessment of each case. This assessment was based on follow-up scans and other clinical data, including the results of laboratory tests, and available diagnostic images, such as from MRI, CT, and radiography, from a mean follow-up period of 4.8 y. RESULTS: The CAD system correctly identified 19 of the 21 patients with metastases in the test group, showing a sensitivity of 90%. False-positive classification of metastases was made in 4 of the 38 patients not classified as having metastases by the gold standard, resulting in a specificity of 89%. CONCLUSION: A completely automated CAD system can be used to detect metastases in bone scans. Application of the method as a clinical decision support tool appears to have significant potential.

Department/s

  • Division of Clinical Chemistry and Pharmacology
  • Department of Astronomy and Theoretical Physics
  • Nuclear medicine, Malmö

Publishing year

2008

Language

English

Pages

1958-1965

Publication/Series

Journal of Nuclear Medicine

Volume

49

Issue

12

Document type

Journal article

Publisher

Society of Nuclear Medicine

Topic

  • Radiology, Nuclear Medicine and Medical Imaging

Keywords

  • neural networks
  • radionuclide imaging
  • computer-assisted diagnosis
  • bone metastases
  • image processing

Status

Published

Research group

  • Nuclear medicine, Malmö

ISBN/ISSN/Other

  • ISSN: 0161-5505