Respiratory Motion Management in PET/CT: Applications and Clinical Usefulness

Author(s): Luca Guerra*, Elena De Ponti, Sabrina Morzenti, Chiara Spadavecchia, Cinzia Crivellaro.

Journal Name: Current Radiopharmaceuticals

Volume 10 , Issue 2 , 2017

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Abstract:

Background and Objective: Breathing movement can introduce heavy bias in both image quality and quantitation in PET/CT. The aim of this paper is a review of the literature to evaluate the benefit of respiratory gating in terms of image quality, quantification and lesion detectability.

Methods: A review of the literature published in the last 10 years and dealing with gated PET/CT technique has been performed, focusing on improvement in quantification, lesion detectability and diagnostic accuracy in neoplastic lesion. In addition, the improvement in the definition of radiotherapy planning has been evaluated.

Results: There is a consistent increase of the Standardized Uptake Value (SUV) in gated PET images when compared to ungated ones, particularly for lesions located in liver and in lung. Respiratory gating can also increase sensitivity, specificity and accuracy of PET/CT. Gated PET/CT can be used for radiation therapy planning, reducing the uncertainty in target definition, optimizing the volume to be treated and reducing the possibility of “missing” during the dose delivery. Moreover, new technologies, able to define the movement of lesions and organs directly from the PET sinogram, can solve some problems that currently are limiting the clinical use of gated PET/CT (i.e.: extended acquisition time, radiation exposure).

Conclusion: The published literature demonstrated that respiratory gating PET/CT is a valid technique to improve quantification, lesion detectability of lung and liver tumors and can better define the radiotherapy planning of moving lesions and organs. If new technical improvements for motion compensation will be clinically validated, gated technique could be applied routinely in any PET/CT scan.

Keywords: Respiratory gating, PET/CT, motion management, quantification, SUV, lung and liver lesions, diagnostic accuracy, radiotherapy.

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Article Details

VOLUME: 10
ISSUE: 2
Year: 2017
Page: [85 - 92]
Pages: 8
DOI: 10.2174/1874471010666170519165918
Price: $58

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