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Clinical Articles, News & Views

New technique enables increasingly accurate PET scan to detect cancer and heart conditions

A novel technique which reduces image degradation caused by respiratory motion during a positron emission tomography (PET) scan has been developed in a recent study at the University of Eastern Finland.

Presented in the PhD thesis of Tuomas Koivumäki, MSc (Tech.), the technique is based on bioimpedance measurement and allows for image reconstruction at a specific phase of the patient’s breathing pattern. This, in turn, makes it possible to reduce image degradation caused by motion.

The study found that when synchronising images on the basis of bioimpedance, it was possible to discern smaller details. Motion compensation also significantly influenced the parameters measured from the images.

The study focused on the feasibility of bioimpedance-based measurement techniques for respiratory and cardiac motion compensation in PET imaging. The study first used computational models and test subjects to determine an optimised bioimpedance measurement configuration for simultaneous measurement of respiratory and cardiac gating signals. The second phase of the study focused on analysing whether bioimpedance techniques can be used to reduce respiration-related degradation of PET images.


1. Tuomas Koivumäki. The bioimpedance technique in respiratory- and dual- gated positron emission tomography imaging. University of Eastern Finland. 2014. Available in full at:

Published on: October 31, 2014

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