ISSN 1305-3825 | E-ISSN 1305-3612
Original Article
Comparison of standardized uptake values obtained from two- and three-dimensional modes of fluorine-18 fluorodeoxyglucose PET-CT in oncological cases
1 Clinic of of Nuclear Medicine, Hatay Antakya State Hospital, Hatay, Turkey  
2 Department of Nuclear Medicine, Adana Başkent University School of Medicine, Adana, Turkey  
3 Department of Nuclear Medicine, Başkent University School of Medicine, Ankara, Turkey  
Diagn Interv Radiol 2013; 19: 126-129
DOI: 10.4261/1305-3825.DIR.6113-12.1
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Abstract

 

PURPOSE 
We investigated the usability of standardized uptake values (SUV) obtained from both two- and three-dimensional (2D and 3D) positron-emission tomography and computed tomography (PET-CT) imaging, and compared the images obtained from these techniques in terms of image quality, lesion detectability, and the presence of artifacts. 

 
MATERIALS AND METHODS 
Image data from 100 patients, who had undergone two PET imagings obtained in 2D and 3D mode after a low dose CT, were evaluated prospectively. Subjective analysis of 2D and 3D images was performed by two readers evaluating the following criteria: overall image quality, detectability of each identified lesion, and the presence of artifacts. The lesions recognized by the readers were also analyzed quantitatively by measuring SUV values. 

 
RESULTS 
There was a significant difference between the SUVs obtained in 2D and 3D modes. Regardless if the first scan was performed in 2D or 3D mode, the values obtained from 3D imaging were significantly lower than those obtained from 2D imaging (mean SUVmax was 10.48±7.57 for 2D, and 9.66±6.93 for 3D, P < 0.001). Visual analysis did not reveal significant differences regarding lesion detectability between two modes. 

 
CONCLUSION 
In oncological PET-CT applications, SUV values are significantly lower in 3D compared with 2D mode. Thus when serial scanning is needed to evaluate response to therapy in the same patient, the imaging modality should be taken into account and performed with the same method to avoid misinterpretation. Additionally, 3D PET-CT imaging can be used instead of 2D PET-CT due to its shorter scanning time without loss of lesion detectability.
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