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Michael Ljungberg

Michael Ljungberg

Professor

Michael Ljungberg

Multi-centre evaluation of accuracy and reproducibility of planar and SPECT image quantification : An IAEA phantom study

Författare

  • Brian E Zimmerman
  • Darko Grošev
  • Irène Buvat
  • Marco A Coca Pérez
  • Eric C Frey
  • Alan Green
  • Anchali Krisanachinda
  • Michael Lassmann
  • Michael Ljungberg
  • Lorena Pozzo
  • Kamila Afroj Quadir
  • Mariella A Terán Gretter
  • Johann Van Staden
  • Gian Luca Poli
Visa allt

Summary, in English

Accurate quantitation of activity provides the basis for internal dosimetry of targeted radionuclide therapies. This study investigated quantitative imaging capabilities at sites with a variety of experience and equipment and assessed levels of errors in activity quantitation in Single-Photon Emission Computed Tomography (SPECT) and planar imaging. Participants from 9 countries took part in a comparison in which planar, SPECT and SPECT with X ray computed tomography (SPECT-CT) imaging were used to quantify activities of four epoxy-filled cylinders containing 133Ba, which was chosen as a surrogate for 131I. The sources, with nominal volumes of 2, 4, 6 and 23mL, were calibrated for 133Ba activity by the National Institute of Standards and Technology, but the activity was initially unknown to the participants. Imaging was performed in a cylindrical phantom filled with water. Two trials were carried out in which the participants first estimated the activities using their local standard protocols, and then repeated the measurements using a standardized acquisition and analysis protocol. Finally, processing of the imaging data from the second trial was repeated by a single centre using a fixed protocol. In the first trial, the activities were underestimated by about 15% with planar imaging. SPECT with Chang's first order attenuation correction (Chang-AC) and SPECT-CT overestimated the activity by about 10%. The second trial showed moderate improvements in accuracy and variability. Planar imaging was subject to methodological errors, e.g., in the use of a transmission scan for attenuation correction. The use of Chang-AC was subject to variability from the definition of phantom contours. The project demonstrated the need for training and standardized protocols to achieve good levels of quantitative accuracy and precision in a multicentre setting. Absolute quantification of simple objects with no background was possible with the strictest protocol to about 6% with planar imaging and SPECT (with Chang-AC) and within 2% for SPECT-CT.

Avdelning/ar

  • Nuclear Medicine Physics
  • Medicinsk strålningsfysik, Lund

Publiceringsår

2017-06

Språk

Engelska

Sidor

98-112

Publikation/Tidskrift/Serie

Zeitschrift für Medizinische Physik

Volym

27

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Medical Laboratory and Measurements Technologies
  • Radiology, Nuclear Medicine and Medical Imaging
  • Other Physics Topics

Nyckelord

  • Humans
  • Image Processing, Computer-Assisted
  • Phantoms, Imaging/standards
  • Radiometry
  • Reproducibility of Results
  • Tomography, Emission-Computed, Single-Photon/methods

Status

Published

Forskningsgrupp

  • Nuclear Medicine Physics

ISBN/ISSN/Övrigt

  • ISSN: 1876-4436