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PET/MR for therapy response evaluation in malignant lymphoma: initial experience.

Ivan Platzek¹, Bettina Beuthien-Baumann, Jens Langner

¹Department of Radiology, Dresden University Hospital, Fetscherstr. 74, 01307 Dresden, Germany. ivan.platzek@uniklinikum-dresden.de

Magma (New York, N.Y.)

|September 18, 2012

Summary

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Positron emission tomography/magnetic resonance imaging (PET/MR) with (18)fluoro-2-deoxyglucose (FDG) is feasible for evaluating malignant lymphoma therapy response. Initial results show high accuracy in assessing treatment effectiveness in lymphoma patients.

Area of Science:

Oncology
Radiology
Nuclear Medicine

Background:

Malignant lymphoma requires accurate therapy response evaluation.
Positron emission tomography/magnetic resonance imaging (PET/MR) offers integrated anatomical and metabolic imaging.

Purpose of the Study:

To assess the feasibility of (18)fluoro-2-deoxyglucose (FDG) PET/MR for therapy response evaluation in malignant lymphoma patients.

Main Methods:

Retrospective analysis of nine lymphoma patients undergoing FDG-PET/MR before and after chemotherapy.
Independent evaluation of scans by two nuclear medicine physicians using Ann Arbor classification and a five-point image quality scale.
Calculation of interrater agreement using weighted kappa (κ).

Main Results:

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All initial scans revealed increased FDG uptake, with Ann Arbor stages ranging from I to IV.
Complete response to chemotherapy was observed in all but one patient on follow-up scans.
PET image quality was rated as very good or excellent; interrater agreement was excellent for staging (κ = 0.97) and good for image quality (κ = 0.41).

Conclusions:

FDG-PET/MR demonstrates promising initial feasibility for therapy response assessment in malignant lymphoma.
The technique shows high accuracy in staging and evaluating treatment efficacy.
High image quality and interrater agreement support its potential clinical utility.